jenna
/
kernel_samsung_sm7125
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Input: add Broadcom iProc touchscreen driver

Browse Source 
Add initial version of the Broadcom touchscreen driver.

Reviewed-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Jonathan Richardson <jonathar@broadcom.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
tirimbino
Jonathan Richardson 10 years ago committed by Dmitry Torokhov
parent 188933ac13
commit d5ae685f15
4 changed files with 611 additions and 0 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 76
      Documentation/devicetree/bindings/input/touchscreen/brcm,iproc-touchscreen.txt
  2. 12
      drivers/input/touchscreen/Kconfig
  3. 1
      drivers/input/touchscreen/Makefile
  4. 522
      drivers/input/touchscreen/bcm_iproc_tsc.c

76
Documentation/devicetree/bindings/input/touchscreen/brcm,iproc-touchscreen.txt
Unescape View File

@ -0,0 +1,76 @@
* Broadcom's IPROC Touchscreen Controller
Required properties:
- compatible: must be "brcm,iproc-touchscreen"
- reg: physical base address of the controller and length of memory mapped
region.
- clocks: The clock provided by the SOC to driver the tsc
- clock-name: name for the clock
- interrupts: The touchscreen controller's interrupt
Optional properties:
- scanning_period: Time between scans. Each step is 1024 us. Valid 1-256.
- debounce_timeout: Each step is 512 us. Valid 0-255
- settling_timeout: The settling duration (in ms) is the amount of time
the tsc waits to allow the voltage to settle after
turning on the drivers in detection mode.
Valid values: 0-11
0 = 0.008 ms
1 = 0.01 ms
2 = 0.02 ms
3 = 0.04 ms
4 = 0.08 ms
5 = 0.16 ms
6 = 0.32 ms
7 = 0.64 ms
8 = 1.28 ms
9 = 2.56 ms
10 = 5.12 ms
11 = 10.24 ms
- touch_timeout: The continuous number of scan periods in which touch is
not detected before the controller returns to idle state.
Valid values 0-255.
- average_data: Number of data samples which are averaged before a final
data point is placed into the FIFO
Valid values 0-7
0 = 1 sample
1 = 2 samples
2 = 4 samples
3 = 8 samples
4 = 16 samples
5 = 32 samples
6 = 64 samples
7 = 128 samples
- fifo_threshold: Interrupt is generated whenever the number of fifo
entries exceeds this value
Valid values 0-31
- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
- touchscreen-size-y: vertical resolution of touchscreen (in pixels)
- touchscreen-fuzz-x: horizontal noise value of the absolute input
device (in pixels)
- touchscreen-fuzz-y: vertical noise value of the absolute input
device (in pixels)
- touchscreen-inverted-x: X axis is inverted (boolean)
- touchscreen-inverted-y: Y axis is inverted (boolean)
Example:
touchscreen: tsc@0x180A6000 {
compatible = "brcm,iproc-touchscreen";
#address-cells = <1>;
#size-cells = <1>;
reg = <0x180A6000 0x40>;
clocks = <&adc_clk>;
clock-names = "tsc_clk";
interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
scanning_period = <5>;
debounce_timeout = <40>;
settling_timeout = <7>;
touch_timeout = <10>;
average_data = <5>;
fifo_threshold = <1>;
/* Touchscreen is rotated 180 degrees. */
touchscreen-inverted-x;
touchscreen-inverted-y;
};

12
drivers/input/touchscreen/Kconfig
Unescape View File

@ -324,6 +324,18 @@ config TOUCHSCREEN_ILI210X
To compile this driver as a module, choose M here: the
module will be called ili210x.
config TOUCHSCREEN_IPROC
tristate "IPROC touch panel driver support"
depends on ARCH_BCM_IPROC || COMPILE_TEST
help
Say Y here if you want to add support for the IPROC touch
controller to your system.
If unsure, say N.
To compile this driver as a module, choose M here: the
module will be called bcm_iproc_tsc.
config TOUCHSCREEN_S3C2410
tristate "Samsung S3C2410/generic touchscreen input driver"
depends on ARCH_S3C24XX || SAMSUNG_DEV_TS

1
drivers/input/touchscreen/Makefile
Unescape View File

@ -39,6 +39,7 @@ obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o

522
drivers/input/touchscreen/bcm_iproc_tsc.c
Unescape View File

@ -0,0 +1,522 @@
/*
* Copyright (C) 2015 Broadcom Corporation
*
* 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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; 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/input.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/keyboard.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <asm/irq.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/serio.h>
#define IPROC_TS_NAME "iproc-ts"
#define PEN_DOWN_STATUS 1
#define PEN_UP_STATUS 0
#define X_MIN 0
#define Y_MIN 0
#define X_MAX 0xFFF
#define Y_MAX 0xFFF
/* Value given by controller for invalid coordinate. */
#define INVALID_COORD 0xFFFFFFFF
/* Register offsets */
#define REGCTL1 0x00
#define REGCTL2 0x04
#define INTERRUPT_THRES 0x08
#define INTERRUPT_MASK 0x0c
#define INTERRUPT_STATUS 0x10
#define CONTROLLER_STATUS 0x14
#define FIFO_DATA 0x18
#define FIFO_DATA_X_Y_MASK 0xFFFF
#define ANALOG_CONTROL 0x1c
#define AUX_DATA 0x20
#define DEBOUNCE_CNTR_STAT 0x24
#define SCAN_CNTR_STAT 0x28
#define REM_CNTR_STAT 0x2c
#define SETTLING_TIMER_STAT 0x30
#define SPARE_REG 0x34
#define SOFT_BYPASS_CONTROL 0x38
#define SOFT_BYPASS_DATA 0x3c
/* Bit values for INTERRUPT_MASK and INTERRUPT_STATUS regs */
#define TS_PEN_INTR_MASK BIT(0)
#define TS_FIFO_INTR_MASK BIT(2)
/* Bit values for CONTROLLER_STATUS reg1 */
#define TS_PEN_DOWN BIT(0)
/* Shift values for control reg1 */
#define SCANNING_PERIOD_SHIFT 24
#define DEBOUNCE_TIMEOUT_SHIFT 16
#define SETTLING_TIMEOUT_SHIFT 8
#define TOUCH_TIMEOUT_SHIFT 0
/* Shift values for coordinates from fifo */
#define X_COORD_SHIFT 0
#define Y_COORD_SHIFT 16
/* Bit values for REGCTL2 */
#define TS_CONTROLLER_EN_BIT BIT(16)
#define TS_CONTROLLER_AVGDATA_SHIFT 8
#define TS_CONTROLLER_AVGDATA_MASK (0x7 << TS_CONTROLLER_AVGDATA_SHIFT)
#define TS_CONTROLLER_PWR_LDO BIT(5)
#define TS_CONTROLLER_PWR_ADC BIT(4)
#define TS_CONTROLLER_PWR_BGP BIT(3)
#define TS_CONTROLLER_PWR_TS BIT(2)
#define TS_WIRE_MODE_BIT BIT(1)
#define dbg_reg(dev, priv, reg) \
dev_dbg(dev, "%20s= 0x%08x\n", #reg, readl((priv)->regs + reg))
struct tsc_param {
/* Each step is 1024 us. Valid 1-256 */
u32 scanning_period;
/* Each step is 512 us. Valid 0-255 */
u32 debounce_timeout;
/*
* The settling duration (in ms) is the amount of time the tsc
* waits to allow the voltage to settle after turning on the
* drivers in detection mode. Valid values: 0-11
* 0 = 0.008 ms
* 1 = 0.01 ms
* 2 = 0.02 ms
* 3 = 0.04 ms
* 4 = 0.08 ms
* 5 = 0.16 ms
* 6 = 0.32 ms
* 7 = 0.64 ms
* 8 = 1.28 ms
* 9 = 2.56 ms
* 10 = 5.12 ms
* 11 = 10.24 ms
*/
u32 settling_timeout;
/* touch timeout in sample counts */
u32 touch_timeout;
/*
* Number of data samples which are averaged before a final data point
* is placed into the FIFO
*/
u32 average_data;
/* FIFO threshold */
u32 fifo_threshold;
/* Optional standard touchscreen properties. */
u32 max_x;
u32 max_y;
u32 fuzz_x;
u32 fuzz_y;
bool invert_x;
bool invert_y;
};
struct iproc_ts_priv {
struct platform_device *pdev;
struct input_dev *idev;
void __iomem *regs;
struct clk *tsc_clk;
int pen_status;
struct tsc_param cfg_params;
};
/*
* Set default values the same as hardware reset values
* except for fifo_threshold with is set to 1.
*/
static const struct tsc_param iproc_default_config = {
.scanning_period = 0x5, /* 1 to 256 */
.debounce_timeout = 0x28, /* 0 to 255 */
.settling_timeout = 0x7, /* 0 to 11 */
.touch_timeout = 0xa, /* 0 to 255 */
.average_data = 5, /* entry 5 = 32 pts */
.fifo_threshold = 1, /* 0 to 31 */
.max_x = X_MAX,
.max_y = Y_MAX,
};
static void ts_reg_dump(struct iproc_ts_priv *priv)
{
struct device *dev = &priv->pdev->dev;
dbg_reg(dev, priv, REGCTL1);
dbg_reg(dev, priv, REGCTL2);
dbg_reg(dev, priv, INTERRUPT_THRES);
dbg_reg(dev, priv, INTERRUPT_MASK);
dbg_reg(dev, priv, INTERRUPT_STATUS);
dbg_reg(dev, priv, CONTROLLER_STATUS);
dbg_reg(dev, priv, FIFO_DATA);
dbg_reg(dev, priv, ANALOG_CONTROL);
dbg_reg(dev, priv, AUX_DATA);
dbg_reg(dev, priv, DEBOUNCE_CNTR_STAT);
dbg_reg(dev, priv, SCAN_CNTR_STAT);
dbg_reg(dev, priv, REM_CNTR_STAT);
dbg_reg(dev, priv, SETTLING_TIMER_STAT);
dbg_reg(dev, priv, SPARE_REG);
dbg_reg(dev, priv, SOFT_BYPASS_CONTROL);
dbg_reg(dev, priv, SOFT_BYPASS_DATA);
}
static irqreturn_t iproc_touchscreen_interrupt(int irq, void *data)
{
struct platform_device *pdev = data;
struct iproc_ts_priv *priv = platform_get_drvdata(pdev);
u32 intr_status;
u32 raw_coordinate;
u16 x;
u16 y;
int i;
bool needs_sync = false;
intr_status = readl(priv->regs + INTERRUPT_STATUS);
intr_status &= TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
if (intr_status == 0)
return IRQ_NONE;
/* Clear all interrupt status bits, write-1-clear */
writel(intr_status, priv->regs + INTERRUPT_STATUS);
/* Pen up/down */
if (intr_status & TS_PEN_INTR_MASK) {
if (readl(priv->regs + CONTROLLER_STATUS) & TS_PEN_DOWN)
priv->pen_status = PEN_DOWN_STATUS;
else
priv->pen_status = PEN_UP_STATUS;
input_report_key(priv->idev, BTN_TOUCH, priv->pen_status);
needs_sync = true;
dev_dbg(&priv->pdev->dev,
"pen up-down (%d)\n", priv->pen_status);
}
/* coordinates in FIFO exceed the theshold */
if (intr_status & TS_FIFO_INTR_MASK) {
for (i = 0; i < priv->cfg_params.fifo_threshold; i++) {
raw_coordinate = readl(priv->regs + FIFO_DATA);
if (raw_coordinate == INVALID_COORD)
continue;
/*
* The x and y coordinate are 16 bits each
* with the x in the lower 16 bits and y in the
* upper 16 bits.
*/
x = (raw_coordinate >> X_COORD_SHIFT) &
FIFO_DATA_X_Y_MASK;
y = (raw_coordinate >> Y_COORD_SHIFT) &
FIFO_DATA_X_Y_MASK;
/* We only want to retain the 12 msb of the 16 */
x = (x >> 4) & 0x0FFF;
y = (y >> 4) & 0x0FFF;
/* adjust x y according to lcd tsc mount angle */
if (priv->cfg_params.invert_x)
x = priv->cfg_params.max_x - x;
if (priv->cfg_params.invert_y)
y = priv->cfg_params.max_y - y;
input_report_abs(priv->idev, ABS_X, x);
input_report_abs(priv->idev, ABS_Y, y);
needs_sync = true;
dev_dbg(&priv->pdev->dev, "xy (0x%x 0x%x)\n", x, y);
}
}
if (needs_sync)
input_sync(priv->idev);
return IRQ_HANDLED;
}
static int iproc_ts_start(struct input_dev *idev)
{
struct iproc_ts_priv *priv = input_get_drvdata(idev);
u32 val;
int error;
/* Enable clock */
error = clk_prepare_enable(priv->tsc_clk);
if (error) {
dev_err(&priv->pdev->dev, "%s clk_prepare_enable failed %d\n",
__func__, error);
return error;
}
/*
* Interrupt is generated when:
* FIFO reaches the int_th value, and pen event(up/down)
*/
val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
writel(val, priv->regs + INTERRUPT_MASK);
writel(priv->cfg_params.fifo_threshold, priv->regs + INTERRUPT_THRES);
/* Initialize control reg1 */
val = 0;
val |= priv->cfg_params.scanning_period << SCANNING_PERIOD_SHIFT;
val |= priv->cfg_params.debounce_timeout << DEBOUNCE_TIMEOUT_SHIFT;
val |= priv->cfg_params.settling_timeout << SETTLING_TIMEOUT_SHIFT;
val |= priv->cfg_params.touch_timeout << TOUCH_TIMEOUT_SHIFT;
writel(val, priv->regs + REGCTL1);
/* Try to clear all interrupt status */
val = readl(priv->regs + INTERRUPT_STATUS);
val |= TS_FIFO_INTR_MASK | TS_PEN_INTR_MASK;
writel(val, priv->regs + INTERRUPT_STATUS);
/* Initialize control reg2 */
val = readl(priv->regs + REGCTL2);
val |= TS_CONTROLLER_EN_BIT | TS_WIRE_MODE_BIT;
val &= ~TS_CONTROLLER_AVGDATA_MASK;
val |= priv->cfg_params.average_data << TS_CONTROLLER_AVGDATA_SHIFT;
val &= ~(TS_CONTROLLER_PWR_LDO | /* PWR up LDO */
TS_CONTROLLER_PWR_ADC | /* PWR up ADC */
TS_CONTROLLER_PWR_BGP | /* PWR up BGP */
TS_CONTROLLER_PWR_TS); /* PWR up TS */
writel(val, priv->regs + REGCTL2);
ts_reg_dump(priv);
return 0;
}
static void iproc_ts_stop(struct input_dev *dev)
{
u32 val;
struct iproc_ts_priv *priv = input_get_drvdata(dev);
writel(0, priv->regs + INTERRUPT_MASK); /* Disable all interrupts */
/* Only power down touch screen controller */
val = readl(priv->regs + REGCTL2);
val |= TS_CONTROLLER_PWR_TS;
writel(val, priv->regs + REGCTL2);
clk_disable(priv->tsc_clk);
}
static int iproc_get_tsc_config(struct device *dev, struct iproc_ts_priv *priv)
{
struct device_node *np = dev->of_node;
u32 val;
priv->cfg_params = iproc_default_config;
if (!np)
return 0;
if (of_property_read_u32(np, "scanning_period", &val) >= 0) {
if (val < 1 || val > 256) {
dev_err(dev, "scanning_period (%u) must be [1-256]\n",
val);
return -EINVAL;
}
priv->cfg_params.scanning_period = val;
}
if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
if (val > 255) {
dev_err(dev, "debounce_timeout (%u) must be [0-255]\n",
val);
return -EINVAL;
}
priv->cfg_params.debounce_timeout = val;
}
if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
if (val > 11) {
dev_err(dev, "settling_timeout (%u) must be [0-11]\n",
val);
return -EINVAL;
}
priv->cfg_params.settling_timeout = val;
}
if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
if (val > 255) {
dev_err(dev, "touch_timeout (%u) must be [0-255]\n",
val);
return -EINVAL;
}
priv->cfg_params.touch_timeout = val;
}
if (of_property_read_u32(np, "average_data", &val) >= 0) {
if (val > 8) {
dev_err(dev, "average_data (%u) must be [0-8]\n", val);
return -EINVAL;
}
priv->cfg_params.average_data = val;
}
if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
if (val > 31) {
dev_err(dev, "fifo_threshold (%u)) must be [0-31]\n",
val);
return -EINVAL;
}
priv->cfg_params.fifo_threshold = val;
}
/* Parse optional properties. */
of_property_read_u32(np, "touchscreen-size-x", &priv->cfg_params.max_x);
of_property_read_u32(np, "touchscreen-size-y", &priv->cfg_params.max_y);
of_property_read_u32(np, "touchscreen-fuzz-x",
&priv->cfg_params.fuzz_x);
of_property_read_u32(np, "touchscreen-fuzz-y",
&priv->cfg_params.fuzz_y);
priv->cfg_params.invert_x =
of_property_read_bool(np, "touchscreen-inverted-x");
priv->cfg_params.invert_y =
of_property_read_bool(np, "touchscreen-inverted-y");
return 0;
}
static int iproc_ts_probe(struct platform_device *pdev)
{
struct iproc_ts_priv *priv;
struct input_dev *idev;
struct resource *res;
int irq;
int error;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* touchscreen controller memory mapped regs */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->regs)) {
error = PTR_ERR(priv->regs);
dev_err(&pdev->dev, "unable to map I/O memory: %d\n", error);
return error;
}
priv->tsc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
if (IS_ERR(priv->tsc_clk)) {
error = PTR_ERR(priv->tsc_clk);
dev_err(&pdev->dev,
"failed getting clock tsc_clk: %d\n", error);
return error;
}
priv->pdev = pdev;
error = iproc_get_tsc_config(&pdev->dev, priv);
if (error) {
dev_err(&pdev->dev, "get_tsc_config failed: %d\n", error);
return error;
}
idev = devm_input_allocate_device(&pdev->dev);
if (!idev) {
dev_err(&pdev->dev, "failed to allocate input device\n");
return -ENOMEM;
}
priv->idev = idev;
priv->pen_status = PEN_UP_STATUS;
/* Set input device info */
idev->name = IPROC_TS_NAME;
idev->dev.parent = &pdev->dev;
idev->id.bustype = BUS_HOST;
idev->id.vendor = SERIO_UNKNOWN;
idev->id.product = 0;
idev->id.version = 0;
idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
__set_bit(BTN_TOUCH, idev->keybit);
input_set_abs_params(idev, ABS_X, X_MIN, priv->cfg_params.max_x,
priv->cfg_params.fuzz_x, 0);
input_set_abs_params(idev, ABS_Y, Y_MIN, priv->cfg_params.max_y,
priv->cfg_params.fuzz_y, 0);
idev->open = iproc_ts_start;
idev->close = iproc_ts_stop;
input_set_drvdata(idev, priv);
platform_set_drvdata(pdev, priv);
/* get interrupt */
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "platform_get_irq failed: %d\n", irq);
return irq;
}
error = devm_request_irq(&pdev->dev, irq,
iproc_touchscreen_interrupt,
IRQF_SHARED, IPROC_TS_NAME, pdev);
if (error)
return error;
error = input_register_device(priv->idev);
if (error) {
dev_err(&pdev->dev,
"failed to register input device: %d\n", error);
return error;
}
return 0;
}
static const struct of_device_id iproc_ts_of_match[] = {
{.compatible = "brcm,iproc-touchscreen", },
{ },
};
MODULE_DEVICE_TABLE(of, iproc_ts_of_match);
static struct platform_driver iproc_ts_driver = {
.probe = iproc_ts_probe,
.driver = {
.name = IPROC_TS_NAME,
.of_match_table = of_match_ptr(iproc_ts_of_match),
},
};
module_platform_driver(iproc_ts_driver);
MODULE_DESCRIPTION("IPROC Touchscreen driver");
MODULE_AUTHOR("Broadcom");
MODULE_LICENSE("GPL v2");
Write Preview
Loading…
Cancel
Save