Merge branches 'ib-mfd-gpio-4.12', 'ib-mfd-iio-input-4.12', 'ib-mfd-input-4.12', 'ib-mfd-leds-4.12', 'ib-mfd-phy-4.12' and 'ib-mfd-pinctrl-samsung-4.12' into ibs-for-mfd-merged
Lee Jones
8 years ago
commit
18973ceb89
@ -0,0 +1,20 @@ |
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Motorola CPCAP on key |
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|
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This module is part of the CPCAP. For more details about the whole |
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chip see Documentation/devicetree/bindings/mfd/motorola-cpcap.txt. |
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|
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This module provides a simple power button event via an Interrupt. |
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|
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Required properties: |
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- compatible: should be one of the following |
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- "motorola,cpcap-pwrbutton" |
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- interrupts: irq specifier for CPCAP's ON IRQ |
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|
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Example: |
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|
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&cpcap { |
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cpcap_pwrbutton: pwrbutton { |
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compatible = "motorola,cpcap-pwrbutton"; |
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interrupts = <23 IRQ_TYPE_NONE>; |
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}; |
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}; |
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@ -0,0 +1,843 @@ |
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/*
|
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* Freescale MXS LRADC ADC driver |
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* |
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* Copyright (c) 2012 DENX Software Engineering, GmbH. |
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* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
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* |
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* Authors: |
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* Marek Vasut <marex@denx.de> |
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* Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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|
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#include <linux/completion.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/interrupt.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/mxs-lradc.h> |
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#include <linux/module.h> |
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#include <linux/of_irq.h> |
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#include <linux/platform_device.h> |
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#include <linux/sysfs.h> |
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|
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#include <linux/iio/buffer.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/trigger.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/iio/sysfs.h> |
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|
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/*
|
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* Make this runtime configurable if necessary. Currently, if the buffered mode |
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* is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before |
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* triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000) |
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* seconds. The result is that the samples arrive every 500mS. |
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*/ |
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#define LRADC_DELAY_TIMER_PER 200 |
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#define LRADC_DELAY_TIMER_LOOP 5 |
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|
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#define VREF_MV_BASE 1850 |
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|
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const char *mx23_lradc_adc_irq_names[] = { |
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"mxs-lradc-channel0", |
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"mxs-lradc-channel1", |
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"mxs-lradc-channel2", |
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"mxs-lradc-channel3", |
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"mxs-lradc-channel4", |
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"mxs-lradc-channel5", |
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}; |
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|
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const char *mx28_lradc_adc_irq_names[] = { |
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"mxs-lradc-thresh0", |
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"mxs-lradc-thresh1", |
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"mxs-lradc-channel0", |
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"mxs-lradc-channel1", |
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"mxs-lradc-channel2", |
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"mxs-lradc-channel3", |
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"mxs-lradc-channel4", |
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"mxs-lradc-channel5", |
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"mxs-lradc-button0", |
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"mxs-lradc-button1", |
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}; |
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|
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static const u32 mxs_lradc_adc_vref_mv[][LRADC_MAX_TOTAL_CHANS] = { |
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[IMX23_LRADC] = { |
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VREF_MV_BASE, /* CH0 */ |
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VREF_MV_BASE, /* CH1 */ |
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VREF_MV_BASE, /* CH2 */ |
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VREF_MV_BASE, /* CH3 */ |
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VREF_MV_BASE, /* CH4 */ |
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VREF_MV_BASE, /* CH5 */ |
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VREF_MV_BASE * 2, /* CH6 VDDIO */ |
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VREF_MV_BASE * 4, /* CH7 VBATT */ |
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VREF_MV_BASE, /* CH8 Temp sense 0 */ |
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VREF_MV_BASE, /* CH9 Temp sense 1 */ |
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VREF_MV_BASE, /* CH10 */ |
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VREF_MV_BASE, /* CH11 */ |
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VREF_MV_BASE, /* CH12 USB_DP */ |
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VREF_MV_BASE, /* CH13 USB_DN */ |
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VREF_MV_BASE, /* CH14 VBG */ |
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VREF_MV_BASE * 4, /* CH15 VDD5V */ |
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}, |
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[IMX28_LRADC] = { |
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VREF_MV_BASE, /* CH0 */ |
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VREF_MV_BASE, /* CH1 */ |
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VREF_MV_BASE, /* CH2 */ |
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VREF_MV_BASE, /* CH3 */ |
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VREF_MV_BASE, /* CH4 */ |
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VREF_MV_BASE, /* CH5 */ |
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VREF_MV_BASE, /* CH6 */ |
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VREF_MV_BASE * 4, /* CH7 VBATT */ |
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VREF_MV_BASE, /* CH8 Temp sense 0 */ |
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VREF_MV_BASE, /* CH9 Temp sense 1 */ |
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VREF_MV_BASE * 2, /* CH10 VDDIO */ |
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VREF_MV_BASE, /* CH11 VTH */ |
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VREF_MV_BASE * 2, /* CH12 VDDA */ |
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VREF_MV_BASE, /* CH13 VDDD */ |
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VREF_MV_BASE, /* CH14 VBG */ |
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VREF_MV_BASE * 4, /* CH15 VDD5V */ |
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}, |
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}; |
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|
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enum mxs_lradc_divbytwo { |
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MXS_LRADC_DIV_DISABLED = 0, |
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MXS_LRADC_DIV_ENABLED, |
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}; |
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|
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struct mxs_lradc_scale { |
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unsigned int integer; |
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unsigned int nano; |
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}; |
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|
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struct mxs_lradc_adc { |
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struct mxs_lradc *lradc; |
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struct device *dev; |
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|
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void __iomem *base; |
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u32 buffer[10]; |
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struct iio_trigger *trig; |
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struct completion completion; |
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spinlock_t lock; |
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|
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const u32 *vref_mv; |
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struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2]; |
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unsigned long is_divided; |
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}; |
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|
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|
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/* Raw I/O operations */ |
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static int mxs_lradc_adc_read_single(struct iio_dev *iio_dev, int chan, |
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int *val) |
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{ |
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struct mxs_lradc_adc *adc = iio_priv(iio_dev); |
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struct mxs_lradc *lradc = adc->lradc; |
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int ret; |
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|
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/*
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* See if there is no buffered operation in progress. If there is simply |
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* bail out. This can be improved to support both buffered and raw IO at |
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* the same time, yet the code becomes horribly complicated. Therefore I |
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* applied KISS principle here. |
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*/ |
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ret = iio_device_claim_direct_mode(iio_dev); |
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if (ret) |
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return ret; |
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|
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reinit_completion(&adc->completion); |
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|
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/*
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* No buffered operation in progress, map the channel and trigger it. |
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* Virtual channel 0 is always used here as the others are always not |
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* used if doing raw sampling. |
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*/ |
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if (lradc->soc == IMX28_LRADC) |
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writel(LRADC_CTRL1_LRADC_IRQ_EN(0), |
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adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
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writel(0x1, adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
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|
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/* Enable / disable the divider per requirement */ |
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if (test_bit(chan, &adc->is_divided)) |
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writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, |
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adc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET); |
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else |
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writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, |
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adc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR); |
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|
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/* Clean the slot's previous content, then set new one. */ |
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writel(LRADC_CTRL4_LRADCSELECT_MASK(0), |
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adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); |
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writel(chan, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); |
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|
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writel(0, adc->base + LRADC_CH(0)); |
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|
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/* Enable the IRQ and start sampling the channel. */ |
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writel(LRADC_CTRL1_LRADC_IRQ_EN(0), |
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adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); |
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writel(BIT(0), adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); |
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|
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/* Wait for completion on the channel, 1 second max. */ |
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ret = wait_for_completion_killable_timeout(&adc->completion, HZ); |
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if (!ret) |
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ret = -ETIMEDOUT; |
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if (ret < 0) |
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goto err; |
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|
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/* Read the data. */ |
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*val = readl(adc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK; |
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ret = IIO_VAL_INT; |
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|
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err: |
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writel(LRADC_CTRL1_LRADC_IRQ_EN(0), |
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adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
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iio_device_release_direct_mode(iio_dev); |
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return ret; |
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} |
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|
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static int mxs_lradc_adc_read_temp(struct iio_dev *iio_dev, int *val) |
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{ |
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int ret, min, max; |
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|
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ret = mxs_lradc_adc_read_single(iio_dev, 8, &min); |
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if (ret != IIO_VAL_INT) |
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return ret; |
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|
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ret = mxs_lradc_adc_read_single(iio_dev, 9, &max); |
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if (ret != IIO_VAL_INT) |
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return ret; |
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|
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*val = max - min; |
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return IIO_VAL_INT; |
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} |
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|
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static int mxs_lradc_adc_read_raw(struct iio_dev *iio_dev, |
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const struct iio_chan_spec *chan, |
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int *val, int *val2, long m) |
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{ |
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struct mxs_lradc_adc *adc = iio_priv(iio_dev); |
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|
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switch (m) { |
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case IIO_CHAN_INFO_RAW: |
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if (chan->type == IIO_TEMP) |
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return mxs_lradc_adc_read_temp(iio_dev, val); |
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|
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return mxs_lradc_adc_read_single(iio_dev, chan->channel, val); |
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|
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case IIO_CHAN_INFO_SCALE: |
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if (chan->type == IIO_TEMP) { |
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/*
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* From the datasheet, we have to multiply by 1.012 and |
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* divide by 4 |
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*/ |
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*val = 0; |
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*val2 = 253000; |
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return IIO_VAL_INT_PLUS_MICRO; |
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} |
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|
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*val = adc->vref_mv[chan->channel]; |
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*val2 = chan->scan_type.realbits - |
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test_bit(chan->channel, &adc->is_divided); |
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return IIO_VAL_FRACTIONAL_LOG2; |
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|
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case IIO_CHAN_INFO_OFFSET: |
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if (chan->type == IIO_TEMP) { |
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/*
|
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* The calculated value from the ADC is in Kelvin, we |
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* want Celsius for hwmon so the offset is -273.15 |
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* The offset is applied before scaling so it is |
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* actually -213.15 * 4 / 1.012 = -1079.644268 |
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*/ |
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*val = -1079; |
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*val2 = 644268; |
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|
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return IIO_VAL_INT_PLUS_MICRO; |
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} |
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|
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return -EINVAL; |
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|
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default: |
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break; |
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} |
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|
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return -EINVAL; |
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} |
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|
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static int mxs_lradc_adc_write_raw(struct iio_dev *iio_dev, |
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const struct iio_chan_spec *chan, |
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int val, int val2, long m) |
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{ |
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struct mxs_lradc_adc *adc = iio_priv(iio_dev); |
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struct mxs_lradc_scale *scale_avail = |
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adc->scale_avail[chan->channel]; |
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int ret; |
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|
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ret = iio_device_claim_direct_mode(iio_dev); |
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if (ret) |
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return ret; |
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|
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switch (m) { |
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case IIO_CHAN_INFO_SCALE: |
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ret = -EINVAL; |
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if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer && |
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val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) { |
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/* divider by two disabled */ |
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clear_bit(chan->channel, &adc->is_divided); |
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ret = 0; |
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} else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer && |
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val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) { |
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/* divider by two enabled */ |
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set_bit(chan->channel, &adc->is_divided); |
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ret = 0; |
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} |
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|
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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|
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iio_device_release_direct_mode(iio_dev); |
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|
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return ret; |
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} |
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|
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static int mxs_lradc_adc_write_raw_get_fmt(struct iio_dev *iio_dev, |
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const struct iio_chan_spec *chan, |
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long m) |
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{ |
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return IIO_VAL_INT_PLUS_NANO; |
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} |
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|
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static ssize_t mxs_lradc_adc_show_scale_avail(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct iio_dev *iio = dev_to_iio_dev(dev); |
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struct mxs_lradc_adc *adc = iio_priv(iio); |
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struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr); |
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int i, ch, len = 0; |
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|
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ch = iio_attr->address; |
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for (i = 0; i < ARRAY_SIZE(adc->scale_avail[ch]); i++) |
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len += sprintf(buf + len, "%u.%09u ", |
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adc->scale_avail[ch][i].integer, |
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adc->scale_avail[ch][i].nano); |
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|
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len += sprintf(buf + len, "\n"); |
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|
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return len; |
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} |
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|
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#define SHOW_SCALE_AVAILABLE_ATTR(ch)\ |
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IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, 0444,\
|
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mxs_lradc_adc_show_scale_avail, NULL, ch) |
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|
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SHOW_SCALE_AVAILABLE_ATTR(0); |
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SHOW_SCALE_AVAILABLE_ATTR(1); |
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SHOW_SCALE_AVAILABLE_ATTR(2); |
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SHOW_SCALE_AVAILABLE_ATTR(3); |
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SHOW_SCALE_AVAILABLE_ATTR(4); |
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SHOW_SCALE_AVAILABLE_ATTR(5); |
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SHOW_SCALE_AVAILABLE_ATTR(6); |
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SHOW_SCALE_AVAILABLE_ATTR(7); |
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SHOW_SCALE_AVAILABLE_ATTR(10); |
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SHOW_SCALE_AVAILABLE_ATTR(11); |
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SHOW_SCALE_AVAILABLE_ATTR(12); |
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SHOW_SCALE_AVAILABLE_ATTR(13); |
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SHOW_SCALE_AVAILABLE_ATTR(14); |
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SHOW_SCALE_AVAILABLE_ATTR(15); |
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|
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static struct attribute *mxs_lradc_adc_attributes[] = { |
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&iio_dev_attr_in_voltage0_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage1_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage2_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage3_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage4_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage5_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage6_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage7_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage10_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage11_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage12_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage13_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage14_scale_available.dev_attr.attr, |
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&iio_dev_attr_in_voltage15_scale_available.dev_attr.attr, |
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NULL |
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}; |
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|
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static const struct attribute_group mxs_lradc_adc_attribute_group = { |
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.attrs = mxs_lradc_adc_attributes, |
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}; |
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|
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static const struct iio_info mxs_lradc_adc_iio_info = { |
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.driver_module = THIS_MODULE, |
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.read_raw = mxs_lradc_adc_read_raw, |
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.write_raw = mxs_lradc_adc_write_raw, |
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.write_raw_get_fmt = mxs_lradc_adc_write_raw_get_fmt, |
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.attrs = &mxs_lradc_adc_attribute_group, |
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}; |
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|
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/* IRQ Handling */ |
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static irqreturn_t mxs_lradc_adc_handle_irq(int irq, void *data) |
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{ |
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struct iio_dev *iio = data; |
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struct mxs_lradc_adc *adc = iio_priv(iio); |
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struct mxs_lradc *lradc = adc->lradc; |
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unsigned long reg = readl(adc->base + LRADC_CTRL1); |
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unsigned long flags; |
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|
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if (!(reg & mxs_lradc_irq_mask(lradc))) |
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return IRQ_NONE; |
||||
|
||||
if (iio_buffer_enabled(iio)) { |
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if (reg & lradc->buffer_vchans) { |
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spin_lock_irqsave(&adc->lock, flags); |
||||
iio_trigger_poll(iio->trig); |
||||
spin_unlock_irqrestore(&adc->lock, flags); |
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} |
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} else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) { |
||||
complete(&adc->completion); |
||||
} |
||||
|
||||
writel(reg & mxs_lradc_irq_mask(lradc), |
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adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
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|
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return IRQ_HANDLED; |
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} |
||||
|
||||
|
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/* Trigger handling */ |
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static irqreturn_t mxs_lradc_adc_trigger_handler(int irq, void *p) |
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{ |
||||
struct iio_poll_func *pf = p; |
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struct iio_dev *iio = pf->indio_dev; |
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struct mxs_lradc_adc *adc = iio_priv(iio); |
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const u32 chan_value = LRADC_CH_ACCUMULATE | |
||||
((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); |
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unsigned int i, j = 0; |
||||
|
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for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { |
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adc->buffer[j] = readl(adc->base + LRADC_CH(j)); |
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writel(chan_value, adc->base + LRADC_CH(j)); |
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adc->buffer[j] &= LRADC_CH_VALUE_MASK; |
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adc->buffer[j] /= LRADC_DELAY_TIMER_LOOP; |
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j++; |
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} |
||||
|
||||
iio_push_to_buffers_with_timestamp(iio, adc->buffer, pf->timestamp); |
||||
|
||||
iio_trigger_notify_done(iio->trig); |
||||
|
||||
return IRQ_HANDLED; |
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} |
||||
|
||||
static int mxs_lradc_adc_configure_trigger(struct iio_trigger *trig, bool state) |
||||
{ |
||||
struct iio_dev *iio = iio_trigger_get_drvdata(trig); |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR; |
||||
|
||||
writel(LRADC_DELAY_KICK, adc->base + (LRADC_DELAY(0) + st)); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static const struct iio_trigger_ops mxs_lradc_adc_trigger_ops = { |
||||
.owner = THIS_MODULE, |
||||
.set_trigger_state = &mxs_lradc_adc_configure_trigger, |
||||
}; |
||||
|
||||
static int mxs_lradc_adc_trigger_init(struct iio_dev *iio) |
||||
{ |
||||
int ret; |
||||
struct iio_trigger *trig; |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
|
||||
trig = devm_iio_trigger_alloc(&iio->dev, "%s-dev%i", iio->name, |
||||
iio->id); |
||||
|
||||
trig->dev.parent = adc->dev; |
||||
iio_trigger_set_drvdata(trig, iio); |
||||
trig->ops = &mxs_lradc_adc_trigger_ops; |
||||
|
||||
ret = iio_trigger_register(trig); |
||||
if (ret) |
||||
return ret; |
||||
|
||||
adc->trig = trig; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void mxs_lradc_adc_trigger_remove(struct iio_dev *iio) |
||||
{ |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
|
||||
iio_trigger_unregister(adc->trig); |
||||
} |
||||
|
||||
static int mxs_lradc_adc_buffer_preenable(struct iio_dev *iio) |
||||
{ |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
struct mxs_lradc *lradc = adc->lradc; |
||||
int chan, ofs = 0; |
||||
unsigned long enable = 0; |
||||
u32 ctrl4_set = 0; |
||||
u32 ctrl4_clr = 0; |
||||
u32 ctrl1_irq = 0; |
||||
const u32 chan_value = LRADC_CH_ACCUMULATE | |
||||
((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); |
||||
|
||||
if (lradc->soc == IMX28_LRADC) |
||||
writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET, |
||||
adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
writel(lradc->buffer_vchans, |
||||
adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
|
||||
for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { |
||||
ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs); |
||||
ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs); |
||||
ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs); |
||||
writel(chan_value, adc->base + LRADC_CH(ofs)); |
||||
bitmap_set(&enable, ofs, 1); |
||||
ofs++; |
||||
} |
||||
|
||||
writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, |
||||
adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); |
||||
writel(ctrl4_clr, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); |
||||
writel(ctrl4_set, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); |
||||
writel(ctrl1_irq, adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); |
||||
writel(enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET, |
||||
adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_SET); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int mxs_lradc_adc_buffer_postdisable(struct iio_dev *iio) |
||||
{ |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
struct mxs_lradc *lradc = adc->lradc; |
||||
|
||||
writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, |
||||
adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); |
||||
|
||||
writel(lradc->buffer_vchans, |
||||
adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
if (lradc->soc == IMX28_LRADC) |
||||
writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET, |
||||
adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static bool mxs_lradc_adc_validate_scan_mask(struct iio_dev *iio, |
||||
const unsigned long *mask) |
||||
{ |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
struct mxs_lradc *lradc = adc->lradc; |
||||
const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS); |
||||
int rsvd_chans = 0; |
||||
unsigned long rsvd_mask = 0; |
||||
|
||||
if (lradc->use_touchbutton) |
||||
rsvd_mask |= CHAN_MASK_TOUCHBUTTON; |
||||
if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_4WIRE) |
||||
rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE; |
||||
if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE) |
||||
rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE; |
||||
|
||||
if (lradc->use_touchbutton) |
||||
rsvd_chans++; |
||||
if (lradc->touchscreen_wire) |
||||
rsvd_chans += 2; |
||||
|
||||
/* Test for attempts to map channels with special mode of operation. */ |
||||
if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS)) |
||||
return false; |
||||
|
||||
/* Test for attempts to map more channels then available slots. */ |
||||
if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS) |
||||
return false; |
||||
|
||||
return true; |
||||
} |
||||
|
||||
static const struct iio_buffer_setup_ops mxs_lradc_adc_buffer_ops = { |
||||
.preenable = &mxs_lradc_adc_buffer_preenable, |
||||
.postenable = &iio_triggered_buffer_postenable, |
||||
.predisable = &iio_triggered_buffer_predisable, |
||||
.postdisable = &mxs_lradc_adc_buffer_postdisable, |
||||
.validate_scan_mask = &mxs_lradc_adc_validate_scan_mask, |
||||
}; |
||||
|
||||
/* Driver initialization */ |
||||
#define MXS_ADC_CHAN(idx, chan_type, name) { \ |
||||
.type = (chan_type), \
|
||||
.indexed = 1, \
|
||||
.scan_index = (idx), \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
|
||||
BIT(IIO_CHAN_INFO_SCALE), \
|
||||
.channel = (idx), \
|
||||
.address = (idx), \
|
||||
.scan_type = { \
|
||||
.sign = 'u', \
|
||||
.realbits = LRADC_RESOLUTION, \
|
||||
.storagebits = 32, \
|
||||
}, \
|
||||
.datasheet_name = (name), \
|
||||
} |
||||
|
||||
static const struct iio_chan_spec mx23_lradc_chan_spec[] = { |
||||
MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"), |
||||
MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"), |
||||
MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"), |
||||
MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"), |
||||
MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"), |
||||
MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"), |
||||
MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"), |
||||
MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"), |
||||
/* Combined Temperature sensors */ |
||||
{ |
||||
.type = IIO_TEMP, |
||||
.indexed = 1, |
||||
.scan_index = 8, |
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
||||
BIT(IIO_CHAN_INFO_OFFSET) | |
||||
BIT(IIO_CHAN_INFO_SCALE), |
||||
.channel = 8, |
||||
.scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,}, |
||||
.datasheet_name = "TEMP_DIE", |
||||
}, |
||||
/* Hidden channel to keep indexes */ |
||||
{ |
||||
.type = IIO_TEMP, |
||||
.indexed = 1, |
||||
.scan_index = -1, |
||||
.channel = 9, |
||||
}, |
||||
MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL), |
||||
MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL), |
||||
MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"), |
||||
MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"), |
||||
MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"), |
||||
MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"), |
||||
}; |
||||
|
||||
static const struct iio_chan_spec mx28_lradc_chan_spec[] = { |
||||
MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"), |
||||
MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"), |
||||
MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"), |
||||
MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"), |
||||
MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"), |
||||
MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"), |
||||
MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"), |
||||
MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"), |
||||
/* Combined Temperature sensors */ |
||||
{ |
||||
.type = IIO_TEMP, |
||||
.indexed = 1, |
||||
.scan_index = 8, |
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
||||
BIT(IIO_CHAN_INFO_OFFSET) | |
||||
BIT(IIO_CHAN_INFO_SCALE), |
||||
.channel = 8, |
||||
.scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,}, |
||||
.datasheet_name = "TEMP_DIE", |
||||
}, |
||||
/* Hidden channel to keep indexes */ |
||||
{ |
||||
.type = IIO_TEMP, |
||||
.indexed = 1, |
||||
.scan_index = -1, |
||||
.channel = 9, |
||||
}, |
||||
MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"), |
||||
MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"), |
||||
MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"), |
||||
MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"), |
||||
MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"), |
||||
MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"), |
||||
}; |
||||
|
||||
static void mxs_lradc_adc_hw_init(struct mxs_lradc_adc *adc) |
||||
{ |
||||
/* The ADC always uses DELAY CHANNEL 0. */ |
||||
const u32 adc_cfg = |
||||
(1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) | |
||||
(LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET); |
||||
|
||||
/* Configure DELAY CHANNEL 0 for generic ADC sampling. */ |
||||
writel(adc_cfg, adc->base + LRADC_DELAY(0)); |
||||
|
||||
/*
|
||||
* Start internal temperature sensing by clearing bit |
||||
* HW_LRADC_CTRL2_TEMPSENSE_PWD. This bit can be left cleared |
||||
* after power up. |
||||
*/ |
||||
writel(0, adc->base + LRADC_CTRL2); |
||||
} |
||||
|
||||
static void mxs_lradc_adc_hw_stop(struct mxs_lradc_adc *adc) |
||||
{ |
||||
writel(0, adc->base + LRADC_DELAY(0)); |
||||
} |
||||
|
||||
static int mxs_lradc_adc_probe(struct platform_device *pdev) |
||||
{ |
||||
struct device *dev = &pdev->dev; |
||||
struct mxs_lradc *lradc = dev_get_drvdata(dev->parent); |
||||
struct mxs_lradc_adc *adc; |
||||
struct iio_dev *iio; |
||||
struct resource *iores; |
||||
int ret, irq, virq, i, s, n; |
||||
u64 scale_uv; |
||||
const char **irq_name; |
||||
|
||||
/* Allocate the IIO device. */ |
||||
iio = devm_iio_device_alloc(dev, sizeof(*adc)); |
||||
if (!iio) { |
||||
dev_err(dev, "Failed to allocate IIO device\n"); |
||||
return -ENOMEM; |
||||
} |
||||
|
||||
adc = iio_priv(iio); |
||||
adc->lradc = lradc; |
||||
adc->dev = dev; |
||||
|
||||
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
||||
adc->base = devm_ioremap(dev, iores->start, resource_size(iores)); |
||||
if (IS_ERR(adc->base)) |
||||
return PTR_ERR(adc->base); |
||||
|
||||
init_completion(&adc->completion); |
||||
spin_lock_init(&adc->lock); |
||||
|
||||
platform_set_drvdata(pdev, iio); |
||||
|
||||
iio->name = pdev->name; |
||||
iio->dev.parent = dev; |
||||
iio->dev.of_node = dev->parent->of_node; |
||||
iio->info = &mxs_lradc_adc_iio_info; |
||||
iio->modes = INDIO_DIRECT_MODE; |
||||
iio->masklength = LRADC_MAX_TOTAL_CHANS; |
||||
|
||||
if (lradc->soc == IMX23_LRADC) { |
||||
iio->channels = mx23_lradc_chan_spec; |
||||
iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec); |
||||
irq_name = mx23_lradc_adc_irq_names; |
||||
n = ARRAY_SIZE(mx23_lradc_adc_irq_names); |
||||
} else { |
||||
iio->channels = mx28_lradc_chan_spec; |
||||
iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec); |
||||
irq_name = mx28_lradc_adc_irq_names; |
||||
n = ARRAY_SIZE(mx28_lradc_adc_irq_names); |
||||
} |
||||
|
||||
ret = stmp_reset_block(adc->base); |
||||
if (ret) |
||||
return ret; |
||||
|
||||
for (i = 0; i < n; i++) { |
||||
irq = platform_get_irq_byname(pdev, irq_name[i]); |
||||
if (irq < 0) |
||||
return irq; |
||||
|
||||
virq = irq_of_parse_and_map(dev->parent->of_node, irq); |
||||
|
||||
ret = devm_request_irq(dev, virq, mxs_lradc_adc_handle_irq, |
||||
0, irq_name[i], iio); |
||||
if (ret) |
||||
return ret; |
||||
} |
||||
|
||||
ret = mxs_lradc_adc_trigger_init(iio); |
||||
if (ret) |
||||
goto err_trig; |
||||
|
||||
ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time, |
||||
&mxs_lradc_adc_trigger_handler, |
||||
&mxs_lradc_adc_buffer_ops); |
||||
if (ret) |
||||
return ret; |
||||
|
||||
adc->vref_mv = mxs_lradc_adc_vref_mv[lradc->soc]; |
||||
|
||||
/* Populate available ADC input ranges */ |
||||
for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) { |
||||
for (s = 0; s < ARRAY_SIZE(adc->scale_avail[i]); s++) { |
||||
/*
|
||||
* [s=0] = optional divider by two disabled (default) |
||||
* [s=1] = optional divider by two enabled |
||||
* |
||||
* The scale is calculated by doing: |
||||
* Vref >> (realbits - s) |
||||
* which multiplies by two on the second component |
||||
* of the array. |
||||
*/ |
||||
scale_uv = ((u64)adc->vref_mv[i] * 100000000) >> |
||||
(LRADC_RESOLUTION - s); |
||||
adc->scale_avail[i][s].nano = |
||||
do_div(scale_uv, 100000000) * 10; |
||||
adc->scale_avail[i][s].integer = scale_uv; |
||||
} |
||||
} |
||||
|
||||
/* Configure the hardware. */ |
||||
mxs_lradc_adc_hw_init(adc); |
||||
|
||||
/* Register IIO device. */ |
||||
ret = iio_device_register(iio); |
||||
if (ret) { |
||||
dev_err(dev, "Failed to register IIO device\n"); |
||||
goto err_dev; |
||||
} |
||||
|
||||
return 0; |
||||
|
||||
err_dev: |
||||
mxs_lradc_adc_hw_stop(adc); |
||||
mxs_lradc_adc_trigger_remove(iio); |
||||
err_trig: |
||||
iio_triggered_buffer_cleanup(iio); |
||||
return ret; |
||||
} |
||||
|
||||
static int mxs_lradc_adc_remove(struct platform_device *pdev) |
||||
{ |
||||
struct iio_dev *iio = platform_get_drvdata(pdev); |
||||
struct mxs_lradc_adc *adc = iio_priv(iio); |
||||
|
||||
iio_device_unregister(iio); |
||||
mxs_lradc_adc_hw_stop(adc); |
||||
mxs_lradc_adc_trigger_remove(iio); |
||||
iio_triggered_buffer_cleanup(iio); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static struct platform_driver mxs_lradc_adc_driver = { |
||||
.driver = { |
||||
.name = "mxs-lradc-adc", |
||||
}, |
||||
.probe = mxs_lradc_adc_probe, |
||||
.remove = mxs_lradc_adc_remove, |
||||
}; |
||||
module_platform_driver(mxs_lradc_adc_driver); |
||||
|
||||
MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); |
||||
MODULE_DESCRIPTION("Freescale MXS LRADC driver general purpose ADC driver"); |
||||
MODULE_LICENSE("GPL"); |
||||
MODULE_ALIAS("platform:mxs-lradc-adc"); |
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,117 @@ |
||||
/**
|
||||
* CPCAP Power Button Input Driver |
||||
* |
||||
* Copyright (C) 2017 Sebastian Reichel <sre@kernel.org> |
||||
* |
||||
* This file is subject to the terms and conditions of the GNU General |
||||
* Public License. See the file "COPYING" in the main directory of this |
||||
* archive for more details. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
* GNU General Public License for more details. |
||||
*/ |
||||
|
||||
#include <linux/module.h> |
||||
#include <linux/init.h> |
||||
#include <linux/kernel.h> |
||||
#include <linux/errno.h> |
||||
#include <linux/input.h> |
||||
#include <linux/interrupt.h> |
||||
#include <linux/regmap.h> |
||||
#include <linux/of.h> |
||||
#include <linux/platform_device.h> |
||||
#include <linux/mfd/motorola-cpcap.h> |
||||
|
||||
#define CPCAP_IRQ_ON 23 |
||||
#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16)) |
||||
|
||||
struct cpcap_power_button { |
||||
struct regmap *regmap; |
||||
struct input_dev *idev; |
||||
struct device *dev; |
||||
}; |
||||
|
||||
static irqreturn_t powerbutton_irq(int irq, void *_button) |
||||
{ |
||||
struct cpcap_power_button *button = _button; |
||||
int val; |
||||
|
||||
val = cpcap_sense_virq(button->regmap, irq); |
||||
if (val < 0) { |
||||
dev_err(button->dev, "irq read failed: %d", val); |
||||
return IRQ_HANDLED; |
||||
} |
||||
|
||||
pm_wakeup_event(button->dev, 0); |
||||
input_report_key(button->idev, KEY_POWER, val); |
||||
input_sync(button->idev); |
||||
|
||||
return IRQ_HANDLED; |
||||
} |
||||
|
||||
static int cpcap_power_button_probe(struct platform_device *pdev) |
||||
{ |
||||
struct cpcap_power_button *button; |
||||
int irq = platform_get_irq(pdev, 0); |
||||
int err; |
||||
|
||||
button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL); |
||||
if (!button) |
||||
return -ENOMEM; |
||||
|
||||
button->idev = devm_input_allocate_device(&pdev->dev); |
||||
if (!button->idev) |
||||
return -ENOMEM; |
||||
|
||||
button->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
||||
if (!button->regmap) |
||||
return -ENODEV; |
||||
|
||||
button->dev = &pdev->dev; |
||||
|
||||
button->idev->name = "cpcap-pwrbutton"; |
||||
button->idev->phys = "cpcap-pwrbutton/input0"; |
||||
button->idev->dev.parent = button->dev; |
||||
input_set_capability(button->idev, EV_KEY, KEY_POWER); |
||||
|
||||
err = devm_request_threaded_irq(&pdev->dev, irq, NULL, |
||||
powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button); |
||||
if (err < 0) { |
||||
dev_err(&pdev->dev, "IRQ request failed: %d\n", err); |
||||
return err; |
||||
} |
||||
|
||||
err = input_register_device(button->idev); |
||||
if (err) { |
||||
dev_err(&pdev->dev, "Input register failed: %d\n", err); |
||||
return err; |
||||
} |
||||
|
||||
device_init_wakeup(&pdev->dev, true); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
#ifdef CONFIG_OF |
||||
static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = { |
||||
{ .compatible = "motorola,cpcap-pwrbutton" }, |
||||
{}, |
||||
}; |
||||
MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table); |
||||
#endif |
||||
|
||||
static struct platform_driver cpcap_power_button_driver = { |
||||
.probe = cpcap_power_button_probe, |
||||
.driver = { |
||||
.name = "cpcap-pwrbutton", |
||||
.of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table), |
||||
}, |
||||
}; |
||||
module_platform_driver(cpcap_power_button_driver); |
||||
|
||||
MODULE_ALIAS("platform:cpcap-pwrbutton"); |
||||
MODULE_DESCRIPTION("CPCAP Power Button"); |
||||
MODULE_LICENSE("GPL"); |
||||
MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); |
||||
@ -0,0 +1,714 @@ |
||||
/*
|
||||
* Freescale MXS LRADC touchscreen driver |
||||
* |
||||
* Copyright (c) 2012 DENX Software Engineering, GmbH. |
||||
* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
||||
* |
||||
* Authors: |
||||
* Marek Vasut <marex@denx.de> |
||||
* Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
||||
* |
||||
* This program is free software; you can redistribute it and/or modify |
||||
* it under the terms of the GNU General Public License as published by |
||||
* the Free Software Foundation; either version 2 of the License, or |
||||
* (at your option) any later version. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
* GNU General Public License for more details. |
||||
*/ |
||||
|
||||
#include <linux/device.h> |
||||
#include <linux/err.h> |
||||
#include <linux/input.h> |
||||
#include <linux/interrupt.h> |
||||
#include <linux/module.h> |
||||
#include <linux/mfd/core.h> |
||||
#include <linux/mfd/mxs-lradc.h> |
||||
#include <linux/of.h> |
||||
#include <linux/of_irq.h> |
||||
#include <linux/platform_device.h> |
||||
|
||||
const char *mxs_lradc_ts_irq_names[] = { |
||||
"mxs-lradc-touchscreen", |
||||
"mxs-lradc-channel6", |
||||
"mxs-lradc-channel7", |
||||
}; |
||||
|
||||
/*
|
||||
* Touchscreen handling |
||||
*/ |
||||
enum mxs_lradc_ts_plate { |
||||
LRADC_TOUCH = 0, |
||||
LRADC_SAMPLE_X, |
||||
LRADC_SAMPLE_Y, |
||||
LRADC_SAMPLE_PRESSURE, |
||||
LRADC_SAMPLE_VALID, |
||||
}; |
||||
|
||||
struct mxs_lradc_ts { |
||||
struct mxs_lradc *lradc; |
||||
struct device *dev; |
||||
|
||||
void __iomem *base; |
||||
/*
|
||||
* When the touchscreen is enabled, we give it two private virtual |
||||
* channels: #6 and #7. This means that only 6 virtual channels (instead |
||||
* of 8) will be available for buffered capture. |
||||
*/ |
||||
#define TOUCHSCREEN_VCHANNEL1 7 |
||||
#define TOUCHSCREEN_VCHANNEL2 6 |
||||
|
||||
struct input_dev *ts_input; |
||||
|
||||
enum mxs_lradc_ts_plate cur_plate; /* state machine */ |
||||
bool ts_valid; |
||||
unsigned int ts_x_pos; |
||||
unsigned int ts_y_pos; |
||||
unsigned int ts_pressure; |
||||
|
||||
/* handle touchscreen's physical behaviour */ |
||||
/* samples per coordinate */ |
||||
unsigned int over_sample_cnt; |
||||
/* time clocks between samples */ |
||||
unsigned int over_sample_delay; |
||||
/* time in clocks to wait after the plates where switched */ |
||||
unsigned int settling_delay; |
||||
spinlock_t lock; |
||||
}; |
||||
|
||||
struct state_info { |
||||
u32 mask; |
||||
u32 bit; |
||||
u32 x_plate; |
||||
u32 y_plate; |
||||
u32 pressure; |
||||
}; |
||||
|
||||
static struct state_info info[] = { |
||||
{LRADC_CTRL0_MX23_PLATE_MASK, LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE, |
||||
LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM, |
||||
LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM, |
||||
LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM}, |
||||
{LRADC_CTRL0_MX28_PLATE_MASK, LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE, |
||||
LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW, |
||||
LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW, |
||||
LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW} |
||||
}; |
||||
|
||||
static bool mxs_lradc_check_touch_event(struct mxs_lradc_ts *ts) |
||||
{ |
||||
return !!(readl(ts->base + LRADC_STATUS) & |
||||
LRADC_STATUS_TOUCH_DETECT_RAW); |
||||
} |
||||
|
||||
static void mxs_lradc_map_ts_channel(struct mxs_lradc_ts *ts, unsigned int vch, |
||||
unsigned int ch) |
||||
{ |
||||
writel(LRADC_CTRL4_LRADCSELECT_MASK(vch), |
||||
ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); |
||||
writel(LRADC_CTRL4_LRADCSELECT(vch, ch), |
||||
ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); |
||||
} |
||||
|
||||
static void mxs_lradc_setup_ts_channel(struct mxs_lradc_ts *ts, unsigned int ch) |
||||
{ |
||||
/*
|
||||
* prepare for oversampling conversion |
||||
* |
||||
* from the datasheet: |
||||
* "The ACCUMULATE bit in the appropriate channel register |
||||
* HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0; |
||||
* otherwise, the IRQs will not fire." |
||||
*/ |
||||
writel(LRADC_CH_ACCUMULATE | |
||||
LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1), |
||||
ts->base + LRADC_CH(ch)); |
||||
|
||||
/* from the datasheet:
|
||||
* "Software must clear this register in preparation for a |
||||
* multi-cycle accumulation. |
||||
*/ |
||||
writel(LRADC_CH_VALUE_MASK, |
||||
ts->base + LRADC_CH(ch) + STMP_OFFSET_REG_CLR); |
||||
|
||||
/*
|
||||
* prepare the delay/loop unit according to the oversampling count |
||||
* |
||||
* from the datasheet: |
||||
* "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1, |
||||
* HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise, |
||||
* the LRADC will not trigger the delay group." |
||||
*/ |
||||
writel(LRADC_DELAY_TRIGGER(1 << ch) | LRADC_DELAY_TRIGGER_DELAYS(0) | |
||||
LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) | |
||||
LRADC_DELAY_DELAY(ts->over_sample_delay - 1), |
||||
ts->base + LRADC_DELAY(3)); |
||||
|
||||
writel(LRADC_CTRL1_LRADC_IRQ(ch), |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
|
||||
/*
|
||||
* after changing the touchscreen plates setting |
||||
* the signals need some initial time to settle. Start the |
||||
* SoC's delay unit and start the conversion later |
||||
* and automatically. |
||||
*/ |
||||
writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | |
||||
LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay), |
||||
ts->base + LRADC_DELAY(2)); |
||||
} |
||||
|
||||
/*
|
||||
* Pressure detection is special: |
||||
* We want to do both required measurements for the pressure detection in |
||||
* one turn. Use the hardware features to chain both conversions and let the |
||||
* hardware report one interrupt if both conversions are done |
||||
*/ |
||||
static void mxs_lradc_setup_ts_pressure(struct mxs_lradc_ts *ts, |
||||
unsigned int ch1, unsigned int ch2) |
||||
{ |
||||
u32 reg; |
||||
|
||||
/*
|
||||
* prepare for oversampling conversion |
||||
* |
||||
* from the datasheet: |
||||
* "The ACCUMULATE bit in the appropriate channel register |
||||
* HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0; |
||||
* otherwise, the IRQs will not fire." |
||||
*/ |
||||
reg = LRADC_CH_ACCUMULATE | |
||||
LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1); |
||||
writel(reg, ts->base + LRADC_CH(ch1)); |
||||
writel(reg, ts->base + LRADC_CH(ch2)); |
||||
|
||||
/* from the datasheet:
|
||||
* "Software must clear this register in preparation for a |
||||
* multi-cycle accumulation. |
||||
*/ |
||||
writel(LRADC_CH_VALUE_MASK, |
||||
ts->base + LRADC_CH(ch1) + STMP_OFFSET_REG_CLR); |
||||
writel(LRADC_CH_VALUE_MASK, |
||||
ts->base + LRADC_CH(ch2) + STMP_OFFSET_REG_CLR); |
||||
|
||||
/* prepare the delay/loop unit according to the oversampling count */ |
||||
writel(LRADC_DELAY_TRIGGER(1 << ch1) | LRADC_DELAY_TRIGGER(1 << ch2) | |
||||
LRADC_DELAY_TRIGGER_DELAYS(0) | |
||||
LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) | |
||||
LRADC_DELAY_DELAY(ts->over_sample_delay - 1), |
||||
ts->base + LRADC_DELAY(3)); |
||||
|
||||
writel(LRADC_CTRL1_LRADC_IRQ(ch2), |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
|
||||
/*
|
||||
* after changing the touchscreen plates setting |
||||
* the signals need some initial time to settle. Start the |
||||
* SoC's delay unit and start the conversion later |
||||
* and automatically. |
||||
*/ |
||||
writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | |
||||
LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay), |
||||
ts->base + LRADC_DELAY(2)); |
||||
} |
||||
|
||||
static unsigned int mxs_lradc_ts_read_raw_channel(struct mxs_lradc_ts *ts, |
||||
unsigned int channel) |
||||
{ |
||||
u32 reg; |
||||
unsigned int num_samples, val; |
||||
|
||||
reg = readl(ts->base + LRADC_CH(channel)); |
||||
if (reg & LRADC_CH_ACCUMULATE) |
||||
num_samples = ts->over_sample_cnt; |
||||
else |
||||
num_samples = 1; |
||||
|
||||
val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET; |
||||
return val / num_samples; |
||||
} |
||||
|
||||
static unsigned int mxs_lradc_read_ts_pressure(struct mxs_lradc_ts *ts, |
||||
unsigned int ch1, unsigned int ch2) |
||||
{ |
||||
u32 reg, mask; |
||||
unsigned int pressure, m1, m2; |
||||
|
||||
mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2); |
||||
reg = readl(ts->base + LRADC_CTRL1) & mask; |
||||
|
||||
while (reg != mask) { |
||||
reg = readl(ts->base + LRADC_CTRL1) & mask; |
||||
dev_dbg(ts->dev, "One channel is still busy: %X\n", reg); |
||||
} |
||||
|
||||
m1 = mxs_lradc_ts_read_raw_channel(ts, ch1); |
||||
m2 = mxs_lradc_ts_read_raw_channel(ts, ch2); |
||||
|
||||
if (m2 == 0) { |
||||
dev_warn(ts->dev, "Cannot calculate pressure\n"); |
||||
return 1 << (LRADC_RESOLUTION - 1); |
||||
} |
||||
|
||||
/* simply scale the value from 0 ... max ADC resolution */ |
||||
pressure = m1; |
||||
pressure *= (1 << LRADC_RESOLUTION); |
||||
pressure /= m2; |
||||
|
||||
dev_dbg(ts->dev, "Pressure = %u\n", pressure); |
||||
return pressure; |
||||
} |
||||
|
||||
#define TS_CH_XP 2 |
||||
#define TS_CH_YP 3 |
||||
#define TS_CH_XM 4 |
||||
#define TS_CH_YM 5 |
||||
|
||||
/*
|
||||
* YP(open)--+-------------+ |
||||
* | |--+ |
||||
* | | | |
||||
* YM(-)--+-------------+ | |
||||
* +--------------+ |
||||
* | | |
||||
* XP(weak+) XM(open) |
||||
* |
||||
* "weak+" means 200k Ohm VDDIO |
||||
* (-) means GND |
||||
*/ |
||||
static void mxs_lradc_setup_touch_detection(struct mxs_lradc_ts *ts) |
||||
{ |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
|
||||
/*
|
||||
* In order to detect a touch event the 'touch detect enable' bit |
||||
* enables: |
||||
* - a weak pullup to the X+ connector |
||||
* - a strong ground at the Y- connector |
||||
*/ |
||||
writel(info[lradc->soc].mask, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
writel(info[lradc->soc].bit, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); |
||||
} |
||||
|
||||
/*
|
||||
* YP(meas)--+-------------+ |
||||
* | |--+ |
||||
* | | | |
||||
* YM(open)--+-------------+ | |
||||
* +--------------+ |
||||
* | | |
||||
* XP(+) XM(-) |
||||
* |
||||
* (+) means here 1.85 V |
||||
* (-) means here GND |
||||
*/ |
||||
static void mxs_lradc_prepare_x_pos(struct mxs_lradc_ts *ts) |
||||
{ |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
|
||||
writel(info[lradc->soc].mask, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
writel(info[lradc->soc].x_plate, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); |
||||
|
||||
ts->cur_plate = LRADC_SAMPLE_X; |
||||
mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_YP); |
||||
mxs_lradc_setup_ts_channel(ts, TOUCHSCREEN_VCHANNEL1); |
||||
} |
||||
|
||||
/*
|
||||
* YP(+)--+-------------+ |
||||
* | |--+ |
||||
* | | | |
||||
* YM(-)--+-------------+ | |
||||
* +--------------+ |
||||
* | | |
||||
* XP(open) XM(meas) |
||||
* |
||||
* (+) means here 1.85 V |
||||
* (-) means here GND |
||||
*/ |
||||
static void mxs_lradc_prepare_y_pos(struct mxs_lradc_ts *ts) |
||||
{ |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
|
||||
writel(info[lradc->soc].mask, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
writel(info[lradc->soc].y_plate, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); |
||||
|
||||
ts->cur_plate = LRADC_SAMPLE_Y; |
||||
mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_XM); |
||||
mxs_lradc_setup_ts_channel(ts, TOUCHSCREEN_VCHANNEL1); |
||||
} |
||||
|
||||
/*
|
||||
* YP(+)--+-------------+ |
||||
* | |--+ |
||||
* | | | |
||||
* YM(meas)--+-------------+ | |
||||
* +--------------+ |
||||
* | | |
||||
* XP(meas) XM(-) |
||||
* |
||||
* (+) means here 1.85 V |
||||
* (-) means here GND |
||||
*/ |
||||
static void mxs_lradc_prepare_pressure(struct mxs_lradc_ts *ts) |
||||
{ |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
|
||||
writel(info[lradc->soc].mask, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
writel(info[lradc->soc].pressure, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); |
||||
|
||||
ts->cur_plate = LRADC_SAMPLE_PRESSURE; |
||||
mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_YM); |
||||
mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL2, TS_CH_XP); |
||||
mxs_lradc_setup_ts_pressure(ts, TOUCHSCREEN_VCHANNEL2, |
||||
TOUCHSCREEN_VCHANNEL1); |
||||
} |
||||
|
||||
static void mxs_lradc_enable_touch_detection(struct mxs_lradc_ts *ts) |
||||
{ |
||||
mxs_lradc_setup_touch_detection(ts); |
||||
|
||||
ts->cur_plate = LRADC_TOUCH; |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); |
||||
} |
||||
|
||||
static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts) |
||||
{ |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
writel(LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1), |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); |
||||
/*
|
||||
* start with the Y-pos, because it uses nearly the same plate |
||||
* settings like the touch detection |
||||
*/ |
||||
mxs_lradc_prepare_y_pos(ts); |
||||
} |
||||
|
||||
static void mxs_lradc_report_ts_event(struct mxs_lradc_ts *ts) |
||||
{ |
||||
input_report_abs(ts->ts_input, ABS_X, ts->ts_x_pos); |
||||
input_report_abs(ts->ts_input, ABS_Y, ts->ts_y_pos); |
||||
input_report_abs(ts->ts_input, ABS_PRESSURE, ts->ts_pressure); |
||||
input_report_key(ts->ts_input, BTN_TOUCH, 1); |
||||
input_sync(ts->ts_input); |
||||
} |
||||
|
||||
static void mxs_lradc_complete_touch_event(struct mxs_lradc_ts *ts) |
||||
{ |
||||
mxs_lradc_setup_touch_detection(ts); |
||||
ts->cur_plate = LRADC_SAMPLE_VALID; |
||||
/*
|
||||
* start a dummy conversion to burn time to settle the signals |
||||
* note: we are not interested in the conversion's value |
||||
*/ |
||||
writel(0, ts->base + LRADC_CH(TOUCHSCREEN_VCHANNEL1)); |
||||
writel(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) | |
||||
LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2), |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
writel(LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) | |
||||
LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), |
||||
ts->base + LRADC_DELAY(2)); |
||||
} |
||||
|
||||
/*
|
||||
* in order to avoid false measurements, report only samples where |
||||
* the surface is still touched after the position measurement |
||||
*/ |
||||
static void mxs_lradc_finish_touch_event(struct mxs_lradc_ts *ts, bool valid) |
||||
{ |
||||
/* if it is still touched, report the sample */ |
||||
if (valid && mxs_lradc_check_touch_event(ts)) { |
||||
ts->ts_valid = true; |
||||
mxs_lradc_report_ts_event(ts); |
||||
} |
||||
|
||||
/* if it is even still touched, continue with the next measurement */ |
||||
if (mxs_lradc_check_touch_event(ts)) { |
||||
mxs_lradc_prepare_y_pos(ts); |
||||
return; |
||||
} |
||||
|
||||
if (ts->ts_valid) { |
||||
/* signal the release */ |
||||
ts->ts_valid = false; |
||||
input_report_key(ts->ts_input, BTN_TOUCH, 0); |
||||
input_sync(ts->ts_input); |
||||
} |
||||
|
||||
/* if it is released, wait for the next touch via IRQ */ |
||||
ts->cur_plate = LRADC_TOUCH; |
||||
writel(0, ts->base + LRADC_DELAY(2)); |
||||
writel(0, ts->base + LRADC_DELAY(3)); |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ | |
||||
LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) | |
||||
LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1), |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); |
||||
} |
||||
|
||||
/* touchscreen's state machine */ |
||||
static void mxs_lradc_handle_touch(struct mxs_lradc_ts *ts) |
||||
{ |
||||
switch (ts->cur_plate) { |
||||
case LRADC_TOUCH: |
||||
if (mxs_lradc_check_touch_event(ts)) |
||||
mxs_lradc_start_touch_event(ts); |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
return; |
||||
|
||||
case LRADC_SAMPLE_Y: |
||||
ts->ts_y_pos = |
||||
mxs_lradc_ts_read_raw_channel(ts, TOUCHSCREEN_VCHANNEL1); |
||||
mxs_lradc_prepare_x_pos(ts); |
||||
return; |
||||
|
||||
case LRADC_SAMPLE_X: |
||||
ts->ts_x_pos = |
||||
mxs_lradc_ts_read_raw_channel(ts, TOUCHSCREEN_VCHANNEL1); |
||||
mxs_lradc_prepare_pressure(ts); |
||||
return; |
||||
|
||||
case LRADC_SAMPLE_PRESSURE: |
||||
ts->ts_pressure = |
||||
mxs_lradc_read_ts_pressure(ts, |
||||
TOUCHSCREEN_VCHANNEL2, |
||||
TOUCHSCREEN_VCHANNEL1); |
||||
mxs_lradc_complete_touch_event(ts); |
||||
return; |
||||
|
||||
case LRADC_SAMPLE_VALID: |
||||
mxs_lradc_finish_touch_event(ts, 1); |
||||
break; |
||||
} |
||||
} |
||||
|
||||
/* IRQ Handling */ |
||||
static irqreturn_t mxs_lradc_ts_handle_irq(int irq, void *data) |
||||
{ |
||||
struct mxs_lradc_ts *ts = data; |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
unsigned long reg = readl(ts->base + LRADC_CTRL1); |
||||
u32 clr_irq = mxs_lradc_irq_mask(lradc); |
||||
const u32 ts_irq_mask = |
||||
LRADC_CTRL1_TOUCH_DETECT_IRQ | |
||||
LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) | |
||||
LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2); |
||||
unsigned long flags; |
||||
|
||||
if (!(reg & mxs_lradc_irq_mask(lradc))) |
||||
return IRQ_NONE; |
||||
|
||||
if (reg & ts_irq_mask) { |
||||
spin_lock_irqsave(&ts->lock, flags); |
||||
mxs_lradc_handle_touch(ts); |
||||
spin_unlock_irqrestore(&ts->lock, flags); |
||||
/* Make sure we don't clear the next conversion's interrupt. */ |
||||
clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) | |
||||
LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2)); |
||||
writel(reg & clr_irq, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
} |
||||
|
||||
return IRQ_HANDLED; |
||||
} |
||||
|
||||
static int mxs_lradc_ts_open(struct input_dev *dev) |
||||
{ |
||||
struct mxs_lradc_ts *ts = input_get_drvdata(dev); |
||||
|
||||
/* Enable the touch-detect circuitry. */ |
||||
mxs_lradc_enable_touch_detection(ts); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void mxs_lradc_ts_stop(struct mxs_lradc_ts *ts) |
||||
{ |
||||
int i; |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
|
||||
/* stop all interrupts from firing */ |
||||
writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN | |
||||
LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) | |
||||
LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
|
||||
/* Power-down touchscreen touch-detect circuitry. */ |
||||
writel(info[lradc->soc].mask, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
|
||||
writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET, |
||||
ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); |
||||
|
||||
for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++) |
||||
writel(0, ts->base + LRADC_DELAY(i)); |
||||
} |
||||
|
||||
static void mxs_lradc_ts_close(struct input_dev *dev) |
||||
{ |
||||
struct mxs_lradc_ts *ts = input_get_drvdata(dev); |
||||
|
||||
mxs_lradc_ts_stop(ts); |
||||
} |
||||
|
||||
static void mxs_lradc_ts_hw_init(struct mxs_lradc_ts *ts) |
||||
{ |
||||
struct mxs_lradc *lradc = ts->lradc; |
||||
|
||||
/* Configure the touchscreen type */ |
||||
if (lradc->soc == IMX28_LRADC) { |
||||
writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); |
||||
|
||||
if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE) |
||||
writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE, |
||||
ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); |
||||
} |
||||
} |
||||
|
||||
static int mxs_lradc_ts_register(struct mxs_lradc_ts *ts) |
||||
{ |
||||
struct input_dev *input = ts->ts_input; |
||||
struct device *dev = ts->dev; |
||||
|
||||
input = devm_input_allocate_device(dev); |
||||
if (!input) |
||||
return -ENOMEM; |
||||
|
||||
input->name = "mxs-lradc-ts"; |
||||
input->id.bustype = BUS_HOST; |
||||
input->open = mxs_lradc_ts_open; |
||||
input->close = mxs_lradc_ts_close; |
||||
|
||||
__set_bit(INPUT_PROP_DIRECT, input->propbit); |
||||
input_set_capability(input, EV_KEY, BTN_TOUCH); |
||||
input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0); |
||||
input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0); |
||||
input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK, |
||||
0, 0); |
||||
|
||||
ts->ts_input = input; |
||||
input_set_drvdata(input, ts); |
||||
|
||||
return input_register_device(input); |
||||
} |
||||
|
||||
static int mxs_lradc_ts_probe(struct platform_device *pdev) |
||||
{ |
||||
struct device *dev = &pdev->dev; |
||||
struct device_node *node = dev->parent->of_node; |
||||
struct mxs_lradc *lradc = dev_get_drvdata(dev->parent); |
||||
struct mxs_lradc_ts *ts; |
||||
struct resource *iores; |
||||
int ret, irq, virq, i; |
||||
u32 ts_wires = 0, adapt; |
||||
|
||||
ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); |
||||
if (!ts) |
||||
return -ENOMEM; |
||||
|
||||
platform_set_drvdata(pdev, ts); |
||||
|
||||
ts->lradc = lradc; |
||||
ts->dev = dev; |
||||
spin_lock_init(&ts->lock); |
||||
|
||||
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
||||
ts->base = devm_ioremap(dev, iores->start, resource_size(iores)); |
||||
if (IS_ERR(ts->base)) |
||||
return PTR_ERR(ts->base); |
||||
|
||||
ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires", |
||||
&ts_wires); |
||||
if (ret) |
||||
return ret; |
||||
|
||||
if (of_property_read_u32(node, "fsl,ave-ctrl", &adapt)) { |
||||
ts->over_sample_cnt = 4; |
||||
} else { |
||||
if (adapt >= 1 || adapt <= 32) { |
||||
ts->over_sample_cnt = adapt; |
||||
} else { |
||||
dev_err(ts->dev, "Invalid sample count (%u)\n", |
||||
adapt); |
||||
return -EINVAL; |
||||
} |
||||
} |
||||
|
||||
if (of_property_read_u32(node, "fsl,ave-delay", &adapt)) { |
||||
ts->over_sample_delay = 2; |
||||
} else { |
||||
if (adapt >= 2 || adapt <= LRADC_DELAY_DELAY_MASK + 1) { |
||||
ts->over_sample_delay = adapt; |
||||
} else { |
||||
dev_err(ts->dev, "Invalid sample delay (%u)\n", |
||||
adapt); |
||||
return -EINVAL; |
||||
} |
||||
} |
||||
|
||||
if (of_property_read_u32(node, "fsl,settling", &adapt)) { |
||||
ts->settling_delay = 10; |
||||
} else { |
||||
if (adapt >= 1 || adapt <= LRADC_DELAY_DELAY_MASK) { |
||||
ts->settling_delay = adapt; |
||||
} else { |
||||
dev_err(ts->dev, "Invalid settling delay (%u)\n", |
||||
adapt); |
||||
return -EINVAL; |
||||
} |
||||
} |
||||
|
||||
ret = stmp_reset_block(ts->base); |
||||
if (ret) |
||||
return ret; |
||||
|
||||
mxs_lradc_ts_hw_init(ts); |
||||
|
||||
for (i = 0; i < 3; i++) { |
||||
irq = platform_get_irq_byname(pdev, mxs_lradc_ts_irq_names[i]); |
||||
if (irq < 0) |
||||
return irq; |
||||
|
||||
virq = irq_of_parse_and_map(node, irq); |
||||
|
||||
mxs_lradc_ts_stop(ts); |
||||
|
||||
ret = devm_request_irq(dev, virq, |
||||
mxs_lradc_ts_handle_irq, |
||||
0, mxs_lradc_ts_irq_names[i], ts); |
||||
if (ret) |
||||
return ret; |
||||
} |
||||
|
||||
return mxs_lradc_ts_register(ts); |
||||
} |
||||
|
||||
static struct platform_driver mxs_lradc_ts_driver = { |
||||
.driver = { |
||||
.name = "mxs-lradc-ts", |
||||
}, |
||||
.probe = mxs_lradc_ts_probe, |
||||
}; |
||||
module_platform_driver(mxs_lradc_ts_driver); |
||||
|
||||
MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); |
||||
MODULE_DESCRIPTION("Freescale MXS LRADC touchscreen driver"); |
||||
MODULE_LICENSE("GPL"); |
||||
MODULE_ALIAS("platform:mxs-lradc-ts"); |
||||
@ -0,0 +1,267 @@ |
||||
/*
|
||||
* Freescale MXS Low Resolution Analog-to-Digital Converter driver |
||||
* |
||||
* Copyright (c) 2012 DENX Software Engineering, GmbH. |
||||
* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
||||
* |
||||
* Authors: |
||||
* Marek Vasut <marex@denx.de> |
||||
* Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
||||
* |
||||
* This program is free software; you can redistribute it and/or modify |
||||
* it under the terms of the GNU General Public License as published by |
||||
* the Free Software Foundation; either version 2 of the License, or |
||||
* (at your option) any later version. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
* GNU General Public License for more details. |
||||
*/ |
||||
|
||||
#include <linux/clk.h> |
||||
#include <linux/device.h> |
||||
#include <linux/mfd/core.h> |
||||
#include <linux/mfd/mxs-lradc.h> |
||||
#include <linux/module.h> |
||||
#include <linux/of.h> |
||||
#include <linux/of_device.h> |
||||
#include <linux/platform_device.h> |
||||
#include <linux/slab.h> |
||||
|
||||
#define ADC_CELL 0 |
||||
#define TSC_CELL 1 |
||||
#define RES_MEM 0 |
||||
|
||||
enum mx23_lradc_irqs { |
||||
MX23_LRADC_TS_IRQ = 0, |
||||
MX23_LRADC_CH0_IRQ, |
||||
MX23_LRADC_CH1_IRQ, |
||||
MX23_LRADC_CH2_IRQ, |
||||
MX23_LRADC_CH3_IRQ, |
||||
MX23_LRADC_CH4_IRQ, |
||||
MX23_LRADC_CH5_IRQ, |
||||
MX23_LRADC_CH6_IRQ, |
||||
MX23_LRADC_CH7_IRQ, |
||||
}; |
||||
|
||||
enum mx28_lradc_irqs { |
||||
MX28_LRADC_TS_IRQ = 0, |
||||
MX28_LRADC_TRESH0_IRQ, |
||||
MX28_LRADC_TRESH1_IRQ, |
||||
MX28_LRADC_CH0_IRQ, |
||||
MX28_LRADC_CH1_IRQ, |
||||
MX28_LRADC_CH2_IRQ, |
||||
MX28_LRADC_CH3_IRQ, |
||||
MX28_LRADC_CH4_IRQ, |
||||
MX28_LRADC_CH5_IRQ, |
||||
MX28_LRADC_CH6_IRQ, |
||||
MX28_LRADC_CH7_IRQ, |
||||
MX28_LRADC_BUTTON0_IRQ, |
||||
MX28_LRADC_BUTTON1_IRQ, |
||||
}; |
||||
|
||||
static struct resource mx23_adc_resources[] = { |
||||
DEFINE_RES_MEM(0x0, 0x0), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"), |
||||
}; |
||||
|
||||
static struct resource mx23_touchscreen_resources[] = { |
||||
DEFINE_RES_MEM(0x0, 0x0), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"), |
||||
DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"), |
||||
}; |
||||
|
||||
static struct resource mx28_adc_resources[] = { |
||||
DEFINE_RES_MEM(0x0, 0x0), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"), |
||||
}; |
||||
|
||||
static struct resource mx28_touchscreen_resources[] = { |
||||
DEFINE_RES_MEM(0x0, 0x0), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"), |
||||
DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"), |
||||
}; |
||||
|
||||
static struct mfd_cell mx23_cells[] = { |
||||
{ |
||||
.name = "mxs-lradc-adc", |
||||
.resources = mx23_adc_resources, |
||||
.num_resources = ARRAY_SIZE(mx23_adc_resources), |
||||
}, |
||||
{ |
||||
.name = "mxs-lradc-ts", |
||||
.resources = mx23_touchscreen_resources, |
||||
.num_resources = ARRAY_SIZE(mx23_touchscreen_resources), |
||||
}, |
||||
}; |
||||
|
||||
static struct mfd_cell mx28_cells[] = { |
||||
{ |
||||
.name = "mxs-lradc-adc", |
||||
.resources = mx28_adc_resources, |
||||
.num_resources = ARRAY_SIZE(mx28_adc_resources), |
||||
}, |
||||
{ |
||||
.name = "mxs-lradc-ts", |
||||
.resources = mx28_touchscreen_resources, |
||||
.num_resources = ARRAY_SIZE(mx28_touchscreen_resources), |
||||
} |
||||
}; |
||||
|
||||
static const struct of_device_id mxs_lradc_dt_ids[] = { |
||||
{ .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, }, |
||||
{ .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, }, |
||||
{ /* sentinel */ } |
||||
}; |
||||
MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); |
||||
|
||||
static int mxs_lradc_probe(struct platform_device *pdev) |
||||
{ |
||||
const struct of_device_id *of_id; |
||||
struct device *dev = &pdev->dev; |
||||
struct device_node *node = dev->of_node; |
||||
struct mxs_lradc *lradc; |
||||
struct mfd_cell *cells = NULL; |
||||
struct resource *res; |
||||
int ret = 0; |
||||
u32 ts_wires = 0; |
||||
|
||||
lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL); |
||||
if (!lradc) |
||||
return -ENOMEM; |
||||
|
||||
of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev); |
||||
if (!of_id) |
||||
return -EINVAL; |
||||
|
||||
lradc->soc = (enum mxs_lradc_id)of_id->data; |
||||
|
||||
lradc->clk = devm_clk_get(&pdev->dev, NULL); |
||||
if (IS_ERR(lradc->clk)) { |
||||
dev_err(dev, "Failed to get the delay unit clock\n"); |
||||
return PTR_ERR(lradc->clk); |
||||
} |
||||
|
||||
ret = clk_prepare_enable(lradc->clk); |
||||
if (ret) { |
||||
dev_err(dev, "Failed to enable the delay unit clock\n"); |
||||
return ret; |
||||
} |
||||
|
||||
ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires", |
||||
&ts_wires); |
||||
|
||||
if (!ret) { |
||||
lradc->buffer_vchans = BUFFER_VCHANS_LIMITED; |
||||
|
||||
switch (ts_wires) { |
||||
case 4: |
||||
lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE; |
||||
break; |
||||
case 5: |
||||
if (lradc->soc == IMX28_LRADC) { |
||||
lradc->touchscreen_wire = |
||||
MXS_LRADC_TOUCHSCREEN_5WIRE; |
||||
break; |
||||
} |
||||
/* fall through to an error message for i.MX23 */ |
||||
default: |
||||
dev_err(&pdev->dev, |
||||
"Unsupported number of touchscreen wires (%d)\n" |
||||
, ts_wires); |
||||
ret = -EINVAL; |
||||
goto err_clk; |
||||
} |
||||
} else { |
||||
lradc->buffer_vchans = BUFFER_VCHANS_ALL; |
||||
} |
||||
|
||||
platform_set_drvdata(pdev, lradc); |
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
||||
if (!res) |
||||
return -ENOMEM; |
||||
|
||||
switch (lradc->soc) { |
||||
case IMX23_LRADC: |
||||
mx23_adc_resources[RES_MEM] = *res; |
||||
mx23_touchscreen_resources[RES_MEM] = *res; |
||||
cells = mx23_cells; |
||||
break; |
||||
case IMX28_LRADC: |
||||
mx28_adc_resources[RES_MEM] = *res; |
||||
mx28_touchscreen_resources[RES_MEM] = *res; |
||||
cells = mx28_cells; |
||||
break; |
||||
default: |
||||
dev_err(dev, "Unsupported SoC\n"); |
||||
ret = -ENODEV; |
||||
goto err_clk; |
||||
} |
||||
|
||||
ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, |
||||
&cells[ADC_CELL], 1, NULL, 0, NULL); |
||||
if (ret) { |
||||
dev_err(&pdev->dev, "Failed to add the ADC subdevice\n"); |
||||
goto err_clk; |
||||
} |
||||
|
||||
if (!lradc->touchscreen_wire) |
||||
return 0; |
||||
|
||||
ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, |
||||
&cells[TSC_CELL], 1, NULL, 0, NULL); |
||||
if (ret) { |
||||
dev_err(&pdev->dev, |
||||
"Failed to add the touchscreen subdevice\n"); |
||||
goto err_clk; |
||||
} |
||||
|
||||
return 0; |
||||
|
||||
err_clk: |
||||
clk_disable_unprepare(lradc->clk); |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
static int mxs_lradc_remove(struct platform_device *pdev) |
||||
{ |
||||
struct mxs_lradc *lradc = platform_get_drvdata(pdev); |
||||
|
||||
clk_disable_unprepare(lradc->clk); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static struct platform_driver mxs_lradc_driver = { |
||||
.driver = { |
||||
.name = "mxs-lradc", |
||||
.of_match_table = mxs_lradc_dt_ids, |
||||
}, |
||||
.probe = mxs_lradc_probe, |
||||
.remove = mxs_lradc_remove, |
||||
}; |
||||
module_platform_driver(mxs_lradc_driver); |
||||
|
||||
MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>"); |
||||
MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver"); |
||||
MODULE_LICENSE("GPL"); |
||||
MODULE_ALIAS("platform:mxs-lradc"); |
||||
@ -0,0 +1,187 @@ |
||||
/*
|
||||
* Freescale MXS Low Resolution Analog-to-Digital Converter driver |
||||
* |
||||
* Copyright (c) 2012 DENX Software Engineering, GmbH. |
||||
* Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> |
||||
* |
||||
* Author: Marek Vasut <marex@denx.de> |
||||
* |
||||
* This program is free software; you can redistribute it and/or modify |
||||
* it under the terms of the GNU General Public License as published by |
||||
* the Free Software Foundation; either version 2 of the License, or |
||||
* (at your option) any later version. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
* GNU General Public License for more details. |
||||
*/ |
||||
|
||||
#ifndef __MFD_MXS_LRADC_H |
||||
#define __MFD_MXS_LRADC_H |
||||
|
||||
#include <linux/bitops.h> |
||||
#include <linux/io.h> |
||||
#include <linux/stmp_device.h> |
||||
|
||||
#define LRADC_MAX_DELAY_CHANS 4 |
||||
#define LRADC_MAX_MAPPED_CHANS 8 |
||||
#define LRADC_MAX_TOTAL_CHANS 16 |
||||
|
||||
#define LRADC_DELAY_TIMER_HZ 2000 |
||||
|
||||
#define LRADC_CTRL0 0x00 |
||||
# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23) |
||||
# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22) |
||||
# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21) |
||||
# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20) |
||||
# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19) |
||||
# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18) |
||||
# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17) |
||||
# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16) |
||||
|
||||
# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20) |
||||
# define LRADC_CTRL0_MX23_YM BIT(19) |
||||
# define LRADC_CTRL0_MX23_XM BIT(18) |
||||
# define LRADC_CTRL0_MX23_YP BIT(17) |
||||
# define LRADC_CTRL0_MX23_XP BIT(16) |
||||
|
||||
# define LRADC_CTRL0_MX28_PLATE_MASK \ |
||||
(LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
|
||||
LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
|
||||
LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
|
||||
LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW) |
||||
|
||||
# define LRADC_CTRL0_MX23_PLATE_MASK \ |
||||
(LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
|
||||
LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
|
||||
LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP) |
||||
|
||||
#define LRADC_CTRL1 0x10 |
||||
#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24) |
||||
#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16)) |
||||
#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16) |
||||
#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16) |
||||
#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16 |
||||
#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8) |
||||
#define LRADC_CTRL1_LRADC_IRQ(n) BIT(n) |
||||
#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff |
||||
#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff |
||||
#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0 |
||||
|
||||
#define LRADC_CTRL2 0x20 |
||||
#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24 |
||||
#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15) |
||||
|
||||
#define LRADC_STATUS 0x40 |
||||
#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0) |
||||
|
||||
#define LRADC_CH(n) (0x50 + (0x10 * (n))) |
||||
#define LRADC_CH_ACCUMULATE BIT(29) |
||||
#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24) |
||||
#define LRADC_CH_NUM_SAMPLES_OFFSET 24 |
||||
#define LRADC_CH_NUM_SAMPLES(x) \ |
||||
((x) << LRADC_CH_NUM_SAMPLES_OFFSET) |
||||
#define LRADC_CH_VALUE_MASK 0x3ffff |
||||
#define LRADC_CH_VALUE_OFFSET 0 |
||||
|
||||
#define LRADC_DELAY(n) (0xd0 + (0x10 * (n))) |
||||
#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24) |
||||
#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24 |
||||
#define LRADC_DELAY_TRIGGER(x) \ |
||||
(((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
|
||||
LRADC_DELAY_TRIGGER_LRADCS_MASK) |
||||
#define LRADC_DELAY_KICK BIT(20) |
||||
#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16) |
||||
#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16 |
||||
#define LRADC_DELAY_TRIGGER_DELAYS(x) \ |
||||
(((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
|
||||
LRADC_DELAY_TRIGGER_DELAYS_MASK) |
||||
#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11) |
||||
#define LRADC_DELAY_LOOP_COUNT_OFFSET 11 |
||||
#define LRADC_DELAY_LOOP(x) \ |
||||
(((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
|
||||
LRADC_DELAY_LOOP_COUNT_MASK) |
||||
#define LRADC_DELAY_DELAY_MASK 0x7ff |
||||
#define LRADC_DELAY_DELAY_OFFSET 0 |
||||
#define LRADC_DELAY_DELAY(x) \ |
||||
(((x) << LRADC_DELAY_DELAY_OFFSET) & \
|
||||
LRADC_DELAY_DELAY_MASK) |
||||
|
||||
#define LRADC_CTRL4 0x140 |
||||
#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4)) |
||||
#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4) |
||||
#define LRADC_CTRL4_LRADCSELECT(n, x) \ |
||||
(((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
|
||||
LRADC_CTRL4_LRADCSELECT_MASK(n)) |
||||
|
||||
#define LRADC_RESOLUTION 12 |
||||
#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1) |
||||
|
||||
#define BUFFER_VCHANS_LIMITED 0x3f |
||||
#define BUFFER_VCHANS_ALL 0xff |
||||
|
||||
/*
|
||||
* Certain LRADC channels are shared between touchscreen |
||||
* and/or touch-buttons and generic LRADC block. Therefore when using |
||||
* either of these, these channels are not available for the regular |
||||
* sampling. The shared channels are as follows: |
||||
* |
||||
* CH0 -- Touch button #0 |
||||
* CH1 -- Touch button #1 |
||||
* CH2 -- Touch screen XPUL |
||||
* CH3 -- Touch screen YPLL |
||||
* CH4 -- Touch screen XNUL |
||||
* CH5 -- Touch screen YNLR |
||||
* CH6 -- Touch screen WIPER (5-wire only) |
||||
* |
||||
* The bit fields below represents which parts of the LRADC block are |
||||
* switched into special mode of operation. These channels can not |
||||
* be sampled as regular LRADC channels. The driver will refuse any |
||||
* attempt to sample these channels. |
||||
*/ |
||||
#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0)) |
||||
#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2) |
||||
#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2) |
||||
|
||||
enum mxs_lradc_id { |
||||
IMX23_LRADC, |
||||
IMX28_LRADC, |
||||
}; |
||||
|
||||
enum mxs_lradc_ts_wires { |
||||
MXS_LRADC_TOUCHSCREEN_NONE = 0, |
||||
MXS_LRADC_TOUCHSCREEN_4WIRE, |
||||
MXS_LRADC_TOUCHSCREEN_5WIRE, |
||||
}; |
||||
|
||||
/**
|
||||
* struct mxs_lradc |
||||
* @soc: soc type (IMX23 or IMX28) |
||||
* @clk: 2 kHz clock for delay units |
||||
* @buffer_vchans: channels that can be used during buffered capture |
||||
* @touchscreen_wire: touchscreen type (4-wire or 5-wire) |
||||
* @use_touchbutton: button state (on or off) |
||||
*/ |
||||
struct mxs_lradc { |
||||
enum mxs_lradc_id soc; |
||||
struct clk *clk; |
||||
u8 buffer_vchans; |
||||
|
||||
enum mxs_lradc_ts_wires touchscreen_wire; |
||||
bool use_touchbutton; |
||||
}; |
||||
|
||||
static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc) |
||||
{ |
||||
switch (lradc->soc) { |
||||
case IMX23_LRADC: |
||||
return LRADC_CTRL1_MX23_LRADC_IRQ_MASK; |
||||
case IMX28_LRADC: |
||||
return LRADC_CTRL1_MX28_LRADC_IRQ_MASK; |
||||
default: |
||||
return 0; |
||||
} |
||||
} |
||||
|
||||
#endif /* __MXS_LRADC_H */ |
||||
Loading…
Reference in new issue