Add sub-driver for the backlights on National Semiconductor / TI LM3533 lighting power chips. The chip provides 256 brightness levels and ambient-light-sensor and pwm input control. [akpm@linux-foundation.org: fix warning] [akpm@linux-foundation.org: fix the type of `mode'] Signed-off-by: Johan Hovold <jhovold@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Rob Landley <rob@landley.net> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Jonathan Cameron <jic23@cam.ac.uk> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>tirimbino
Johan Hovold
13 years ago
committed by
Linus Torvalds
parent
1615d210db
commit
7f26c970b4
@ -0,0 +1,48 @@ |
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What: /sys/class/backlight/<backlight>/als_channel |
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Date: May 2012 |
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KernelVersion: 3.5 |
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Contact: Johan Hovold <jhovold@gmail.com> |
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Description: |
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Get the ALS output channel used as input in |
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ALS-current-control mode (0, 1), where |
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|
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0 - out_current0 (backlight 0) |
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1 - out_current1 (backlight 1) |
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|
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What: /sys/class/backlight/<backlight>/als_en |
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Date: May 2012 |
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KernelVersion: 3.5 |
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Contact: Johan Hovold <jhovold@gmail.com> |
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Description: |
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Enable ALS-current-control mode (0, 1). |
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What: /sys/class/backlight/<backlight>/id |
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Date: April 2012 |
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KernelVersion: 3.5 |
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Contact: Johan Hovold <jhovold@gmail.com> |
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Description: |
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Get the id of this backlight (0, 1). |
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What: /sys/class/backlight/<backlight>/linear |
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Date: April 2012 |
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KernelVersion: 3.5 |
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Contact: Johan Hovold <jhovold@gmail.com> |
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Description: |
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Set the brightness-mapping mode (0, 1), where |
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0 - exponential mode |
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1 - linear mode |
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|
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What: /sys/class/backlight/<backlight>/pwm |
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Date: April 2012 |
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KernelVersion: 3.5 |
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Contact: Johan Hovold <jhovold@gmail.com> |
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Description: |
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Set the PWM-input control mask (5 bits), where |
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bit 5 - PWM-input enabled in Zone 4 |
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bit 4 - PWM-input enabled in Zone 3 |
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bit 3 - PWM-input enabled in Zone 2 |
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bit 2 - PWM-input enabled in Zone 1 |
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bit 1 - PWM-input enabled in Zone 0 |
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bit 0 - PWM-input enabled |
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@ -0,0 +1,423 @@ |
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/*
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* lm3533-bl.c -- LM3533 Backlight driver |
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* |
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* Copyright (C) 2011-2012 Texas Instruments |
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* |
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* Author: Johan Hovold <jhovold@gmail.com> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/backlight.h> |
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#include <linux/fb.h> |
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#include <linux/slab.h> |
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#include <linux/mfd/lm3533.h> |
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#define LM3533_HVCTRLBANK_COUNT 2 |
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#define LM3533_BL_MAX_BRIGHTNESS 255 |
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#define LM3533_REG_CTRLBANK_AB_BCONF 0x1a |
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struct lm3533_bl { |
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struct lm3533 *lm3533; |
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struct lm3533_ctrlbank cb; |
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struct backlight_device *bd; |
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int id; |
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}; |
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static inline int lm3533_bl_get_ctrlbank_id(struct lm3533_bl *bl) |
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{ |
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return bl->id; |
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} |
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static int lm3533_bl_update_status(struct backlight_device *bd) |
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{ |
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struct lm3533_bl *bl = bl_get_data(bd); |
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int brightness = bd->props.brightness; |
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if (bd->props.power != FB_BLANK_UNBLANK) |
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brightness = 0; |
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if (bd->props.fb_blank != FB_BLANK_UNBLANK) |
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brightness = 0; |
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return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness); |
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} |
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static int lm3533_bl_get_brightness(struct backlight_device *bd) |
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{ |
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struct lm3533_bl *bl = bl_get_data(bd); |
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u8 val; |
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int ret; |
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ret = lm3533_ctrlbank_get_brightness(&bl->cb, &val); |
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if (ret) |
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return ret; |
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return val; |
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} |
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static const struct backlight_ops lm3533_bl_ops = { |
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.get_brightness = lm3533_bl_get_brightness, |
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.update_status = lm3533_bl_update_status, |
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}; |
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static ssize_t show_id(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id); |
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} |
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static ssize_t show_als_channel(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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unsigned channel = lm3533_bl_get_ctrlbank_id(bl); |
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return scnprintf(buf, PAGE_SIZE, "%u\n", channel); |
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} |
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static ssize_t show_als_en(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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int ctrlbank = lm3533_bl_get_ctrlbank_id(bl); |
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u8 val; |
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u8 mask; |
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bool enable; |
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int ret; |
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ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val); |
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if (ret) |
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return ret; |
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mask = 1 << (2 * ctrlbank); |
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enable = val & mask; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", enable); |
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} |
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static ssize_t store_als_en(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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int ctrlbank = lm3533_bl_get_ctrlbank_id(bl); |
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int enable; |
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u8 val; |
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u8 mask; |
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int ret; |
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if (kstrtoint(buf, 0, &enable)) |
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return -EINVAL; |
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mask = 1 << (2 * ctrlbank); |
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if (enable) |
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val = mask; |
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else |
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val = 0; |
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ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val, |
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mask); |
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if (ret) |
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return ret; |
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return len; |
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} |
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static ssize_t show_linear(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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u8 val; |
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u8 mask; |
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int linear; |
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int ret; |
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ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val); |
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if (ret) |
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return ret; |
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mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1); |
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if (val & mask) |
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linear = 1; |
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else |
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linear = 0; |
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return scnprintf(buf, PAGE_SIZE, "%x\n", linear); |
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} |
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static ssize_t store_linear(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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unsigned long linear; |
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u8 mask; |
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u8 val; |
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int ret; |
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if (kstrtoul(buf, 0, &linear)) |
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return -EINVAL; |
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mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1); |
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if (linear) |
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val = mask; |
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else |
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val = 0; |
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ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val, |
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mask); |
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if (ret) |
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return ret; |
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return len; |
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} |
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static ssize_t show_pwm(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 lm3533_bl *bl = dev_get_drvdata(dev); |
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u8 val; |
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int ret; |
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ret = lm3533_ctrlbank_get_pwm(&bl->cb, &val); |
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if (ret) |
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return ret; |
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return scnprintf(buf, PAGE_SIZE, "%u\n", val); |
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} |
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static ssize_t store_pwm(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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u8 val; |
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int ret; |
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if (kstrtou8(buf, 0, &val)) |
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return -EINVAL; |
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ret = lm3533_ctrlbank_set_pwm(&bl->cb, val); |
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if (ret) |
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return ret; |
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return len; |
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} |
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static LM3533_ATTR_RO(als_channel); |
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static LM3533_ATTR_RW(als_en); |
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static LM3533_ATTR_RO(id); |
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static LM3533_ATTR_RW(linear); |
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static LM3533_ATTR_RW(pwm); |
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static struct attribute *lm3533_bl_attributes[] = { |
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&dev_attr_als_channel.attr, |
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&dev_attr_als_en.attr, |
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&dev_attr_id.attr, |
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&dev_attr_linear.attr, |
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&dev_attr_pwm.attr, |
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NULL, |
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}; |
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static umode_t lm3533_bl_attr_is_visible(struct kobject *kobj, |
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struct attribute *attr, int n) |
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{ |
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struct device *dev = container_of(kobj, struct device, kobj); |
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struct lm3533_bl *bl = dev_get_drvdata(dev); |
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umode_t mode = attr->mode; |
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if (attr == &dev_attr_als_channel.attr || |
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attr == &dev_attr_als_en.attr) { |
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if (!bl->lm3533->have_als) |
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mode = 0; |
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} |
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return mode; |
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}; |
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static struct attribute_group lm3533_bl_attribute_group = { |
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.is_visible = lm3533_bl_attr_is_visible, |
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.attrs = lm3533_bl_attributes |
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}; |
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static int __devinit lm3533_bl_setup(struct lm3533_bl *bl, |
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struct lm3533_bl_platform_data *pdata) |
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{ |
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int ret; |
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ret = lm3533_ctrlbank_set_max_current(&bl->cb, pdata->max_current); |
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if (ret) |
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return ret; |
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return lm3533_ctrlbank_set_pwm(&bl->cb, pdata->pwm); |
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} |
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static int __devinit lm3533_bl_probe(struct platform_device *pdev) |
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{ |
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struct lm3533 *lm3533; |
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struct lm3533_bl_platform_data *pdata; |
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struct lm3533_bl *bl; |
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struct backlight_device *bd; |
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struct backlight_properties props; |
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int ret; |
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dev_dbg(&pdev->dev, "%s\n", __func__); |
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lm3533 = dev_get_drvdata(pdev->dev.parent); |
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if (!lm3533) |
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return -EINVAL; |
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pdata = pdev->dev.platform_data; |
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if (!pdata) { |
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dev_err(&pdev->dev, "no platform data\n"); |
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return -EINVAL; |
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} |
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if (pdev->id < 0 || pdev->id >= LM3533_HVCTRLBANK_COUNT) { |
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dev_err(&pdev->dev, "illegal backlight id %d\n", pdev->id); |
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return -EINVAL; |
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} |
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bl = kzalloc(sizeof(*bl), GFP_KERNEL); |
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if (!bl) { |
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dev_err(&pdev->dev, |
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"failed to allocate memory for backlight\n"); |
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return -ENOMEM; |
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} |
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bl->lm3533 = lm3533; |
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bl->id = pdev->id; |
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bl->cb.lm3533 = lm3533; |
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bl->cb.id = lm3533_bl_get_ctrlbank_id(bl); |
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bl->cb.dev = NULL; /* until registered */ |
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memset(&props, 0, sizeof(props)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = LM3533_BL_MAX_BRIGHTNESS; |
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props.brightness = pdata->default_brightness; |
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bd = backlight_device_register(pdata->name, pdev->dev.parent, bl, |
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&lm3533_bl_ops, &props); |
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if (IS_ERR(bd)) { |
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dev_err(&pdev->dev, "failed to register backlight device\n"); |
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ret = PTR_ERR(bd); |
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goto err_free; |
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} |
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bl->bd = bd; |
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bl->cb.dev = &bl->bd->dev; |
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platform_set_drvdata(pdev, bl); |
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ret = sysfs_create_group(&bd->dev.kobj, &lm3533_bl_attribute_group); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "failed to create sysfs attributes\n"); |
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goto err_unregister; |
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} |
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backlight_update_status(bd); |
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ret = lm3533_bl_setup(bl, pdata); |
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if (ret) |
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goto err_sysfs_remove; |
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ret = lm3533_ctrlbank_enable(&bl->cb); |
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if (ret) |
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goto err_sysfs_remove; |
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return 0; |
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err_sysfs_remove: |
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sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group); |
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err_unregister: |
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backlight_device_unregister(bd); |
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err_free: |
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kfree(bl); |
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return ret; |
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} |
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static int __devexit lm3533_bl_remove(struct platform_device *pdev) |
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{ |
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struct lm3533_bl *bl = platform_get_drvdata(pdev); |
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struct backlight_device *bd = bl->bd; |
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dev_dbg(&bd->dev, "%s\n", __func__); |
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bd->props.power = FB_BLANK_POWERDOWN; |
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bd->props.brightness = 0; |
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lm3533_ctrlbank_disable(&bl->cb); |
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sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group); |
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backlight_device_unregister(bd); |
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kfree(bl); |
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return 0; |
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} |
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#ifdef CONFIG_PM |
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static int lm3533_bl_suspend(struct platform_device *pdev, pm_message_t state) |
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{ |
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struct lm3533_bl *bl = platform_get_drvdata(pdev); |
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dev_dbg(&pdev->dev, "%s\n", __func__); |
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return lm3533_ctrlbank_disable(&bl->cb); |
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} |
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static int lm3533_bl_resume(struct platform_device *pdev) |
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{ |
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struct lm3533_bl *bl = platform_get_drvdata(pdev); |
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dev_dbg(&pdev->dev, "%s\n", __func__); |
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return lm3533_ctrlbank_enable(&bl->cb); |
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} |
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#else |
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#define lm3533_bl_suspend NULL |
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#define lm3533_bl_resume NULL |
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#endif |
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static void lm3533_bl_shutdown(struct platform_device *pdev) |
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{ |
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struct lm3533_bl *bl = platform_get_drvdata(pdev); |
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dev_dbg(&pdev->dev, "%s\n", __func__); |
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lm3533_ctrlbank_disable(&bl->cb); |
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} |
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static struct platform_driver lm3533_bl_driver = { |
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.driver = { |
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.name = "lm3533-backlight", |
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.owner = THIS_MODULE, |
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}, |
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.probe = lm3533_bl_probe, |
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.remove = __devexit_p(lm3533_bl_remove), |
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.shutdown = lm3533_bl_shutdown, |
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.suspend = lm3533_bl_suspend, |
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.resume = lm3533_bl_resume, |
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}; |
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module_platform_driver(lm3533_bl_driver); |
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|
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MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); |
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MODULE_DESCRIPTION("LM3533 Backlight driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:lm3533-backlight"); |
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