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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds

Browse Source 
Pull LED subsystem update from Bryan Wu:
 "We got some cleanup and driver for LP8860 as well as some patches for
  LED Flash Class"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds:
  leds: lp8860: Fix module dependency
  leds: lp8860: Introduce TI lp8860 4 channel LED driver
  leds: Add support for setting brightness in a synchronous way
  leds: implement sysfs interface locking mechanism
  leds: syscon: handle multiple syscon instances
  leds: delete copy/paste mistake
  leds: regulator: Convert to devm_regulator_get_exclusive
This commit is contained in:
Linus Torvalds 2014-12-15 18:28:25 -08:00
commit 2dbfca5a18
17 changed files with 714 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
Documentation/devicetree/bindings/leds/leds-lp8860.txt Normal file
View File

@ -0,0 +1,29 @@
* Texas Instruments - lp8860 4-Channel LED Driver
The LP8860-Q1 is an high-efficiency LED
driver with boost controller. It has 4 high-precision
current sinks that can be controlled by a PWM input
signal, a SPI/I2C master, or both.
Required properties:
- compatible:
"ti,lp8860"
- reg - I2C slave address
- label - Used for naming LEDs
Optional properties:
- enable-gpio - gpio pin to enable/disable the device.
- supply - "vled" - LED supply
Example:
leds: leds@6 {
compatible = "ti,lp8860";
reg = <0x2d>;
label = "display_cluster";
enable-gpio = <&gpio1 28 GPIO_ACTIVE_HIGH>;
vled-supply = <&vbatt>;
}
For more product information please see the link below:
http://www.ti.com/product/lp8860-q1

11
drivers/leds/Kconfig
View File

@ -250,6 +250,17 @@ config LEDS_LP8788
help
This option enables support for the Keyboard LEDs on the LP8788 PMIC.
config LEDS_LP8860
tristate "LED support for the TI LP8860 4 channel LED driver"
depends on LEDS_CLASS && I2C
select REGMAP_I2C
help
If you say yes here you get support for the TI LP8860 4 channel
LED driver.
This option enables support for the display cluster LEDs
on the LP8860 4 channel LED driver using the I2C communication
bus.
config LEDS_CLEVO_MAIL
tristate "Mail LED on Clevo notebook"
depends on LEDS_CLASS

1
drivers/leds/Makefile
View File

@ -28,6 +28,7 @@ obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
obj-$(CONFIG_LEDS_LP5562) += leds-lp5562.o
obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o
obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o

29
drivers/leds/led-class.c
View File

@ -40,17 +40,27 @@ static ssize_t brightness_store(struct device *dev,
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
unsigned long state;
ssize_t ret = -EINVAL;
ssize_t ret;
mutex_lock(&led_cdev->led_access);
if (led_sysfs_is_disabled(led_cdev)) {
ret = -EBUSY;
goto unlock;
}
ret = kstrtoul(buf, 10, &state);
if (ret)
return ret;
goto unlock;
if (state == LED_OFF)
led_trigger_remove(led_cdev);
__led_set_brightness(led_cdev, state);
led_set_brightness(led_cdev, state);
return size;
ret = size;
unlock:
mutex_unlock(&led_cdev->led_access);
return ret;
}
static DEVICE_ATTR_RW(brightness);
@ -99,7 +109,7 @@ static void led_timer_function(unsigned long data)
unsigned long delay;
if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
__led_set_brightness(led_cdev, LED_OFF);
led_set_brightness_async(led_cdev, LED_OFF);
return;
}
@ -122,7 +132,7 @@ static void led_timer_function(unsigned long data)
delay = led_cdev->blink_delay_off;
}
__led_set_brightness(led_cdev, brightness);
led_set_brightness_async(led_cdev, brightness);
/* Return in next iteration if led is in one-shot mode and we are in
* the final blink state so that the led is toggled each delay_on +
@ -148,7 +158,7 @@ static void set_brightness_delayed(struct work_struct *ws)
led_stop_software_blink(led_cdev);
__led_set_brightness(led_cdev, led_cdev->delayed_set_value);
led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
}
/**
@ -214,6 +224,7 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
#ifdef CONFIG_LEDS_TRIGGERS
init_rwsem(&led_cdev->trigger_lock);
#endif
mutex_init(&led_cdev->led_access);
/* add to the list of leds */
down_write(&leds_list_lock);
list_add_tail(&led_cdev->node, &leds_list);
@ -222,6 +233,8 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
if (!led_cdev->max_brightness)
led_cdev->max_brightness = LED_FULL;
led_cdev->flags |= SET_BRIGHTNESS_ASYNC;
led_update_brightness(led_cdev);
INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
@ -267,6 +280,8 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
down_write(&leds_list_lock);
list_del(&led_cdev->node);
up_write(&leds_list_lock);
mutex_destroy(&led_cdev->led_access);
}
EXPORT_SYMBOL_GPL(led_classdev_unregister);

36
drivers/leds/led-core.c
View File

@ -42,13 +42,13 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
/* never on - just set to off */
if (!delay_on) {
__led_set_brightness(led_cdev, LED_OFF);
led_set_brightness_async(led_cdev, LED_OFF);
return;
}
/* never off - just set to brightness */
if (!delay_off) {
__led_set_brightness(led_cdev, led_cdev->blink_brightness);
led_set_brightness_async(led_cdev, led_cdev->blink_brightness);
return;
}
@ -117,6 +117,8 @@ EXPORT_SYMBOL_GPL(led_stop_software_blink);
void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
int ret = 0;
/* delay brightness setting if need to stop soft-blink timer */
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
led_cdev->delayed_set_value = brightness;
@ -124,7 +126,17 @@ void led_set_brightness(struct led_classdev *led_cdev,
return;
}
__led_set_brightness(led_cdev, brightness);
if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
led_set_brightness_async(led_cdev, brightness);
return;
} else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
ret = led_set_brightness_sync(led_cdev, brightness);
else
ret = -EINVAL;
if (ret < 0)
dev_dbg(led_cdev->dev, "Setting LED brightness failed (%d)\n",
ret);
}
EXPORT_SYMBOL(led_set_brightness);
@ -143,3 +155,21 @@ int led_update_brightness(struct led_classdev *led_cdev)
return ret;
}
EXPORT_SYMBOL(led_update_brightness);
/* Caller must ensure led_cdev->led_access held */
void led_sysfs_disable(struct led_classdev *led_cdev)
{
lockdep_assert_held(&led_cdev->led_access);
led_cdev->flags |= LED_SYSFS_DISABLE;
}
EXPORT_SYMBOL_GPL(led_sysfs_disable);
/* Caller must ensure led_cdev->led_access held */
void led_sysfs_enable(struct led_classdev *led_cdev)
{
lockdep_assert_held(&led_cdev->led_access);
led_cdev->flags &= ~LED_SYSFS_DISABLE;
}
EXPORT_SYMBOL_GPL(led_sysfs_enable);

16
drivers/leds/led-triggers.c
View File

@ -37,6 +37,14 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
char trigger_name[TRIG_NAME_MAX];
struct led_trigger *trig;
size_t len;
int ret = count;
mutex_lock(&led_cdev->led_access);
if (led_sysfs_is_disabled(led_cdev)) {
ret = -EBUSY;
goto unlock;
}
trigger_name[sizeof(trigger_name) - 1] = '\0';
strncpy(trigger_name, buf, sizeof(trigger_name) - 1);
@ -47,7 +55,7 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
if (!strcmp(trigger_name, "none")) {
led_trigger_remove(led_cdev);
return count;
goto unlock;
}
down_read(&triggers_list_lock);
@ -58,12 +66,14 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
up_write(&led_cdev->trigger_lock);
up_read(&triggers_list_lock);
return count;
goto unlock;
}
}
up_read(&triggers_list_lock);
return -EINVAL;
unlock:
mutex_unlock(&led_cdev->led_access);
return ret;
}
EXPORT_SYMBOL_GPL(led_trigger_store);

491
drivers/leds/leds-lp8860.c Normal file
View File

@ -0,0 +1,491 @@
/*
* TI LP8860 4-Channel LED Driver
*
* Copyright (C) 2014 Texas Instruments
*
* Author: Dan Murphy <dmurphy@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
*/
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#define LP8860_DISP_CL1_BRT_MSB 0x00
#define LP8860_DISP_CL1_BRT_LSB 0x01
#define LP8860_DISP_CL1_CURR_MSB 0x02
#define LP8860_DISP_CL1_CURR_LSB 0x03
#define LP8860_CL2_BRT_MSB 0x04
#define LP8860_CL2_BRT_LSB 0x05
#define LP8860_CL2_CURRENT 0x06
#define LP8860_CL3_BRT_MSB 0x07
#define LP8860_CL3_BRT_LSB 0x08
#define LP8860_CL3_CURRENT 0x09
#define LP8860_CL4_BRT_MSB 0x0a
#define LP8860_CL4_BRT_LSB 0x0b
#define LP8860_CL4_CURRENT 0x0c
#define LP8860_CONFIG 0x0d
#define LP8860_STATUS 0x0e
#define LP8860_FAULT 0x0f
#define LP8860_LED_FAULT 0x10
#define LP8860_FAULT_CLEAR 0x11
#define LP8860_ID 0x12
#define LP8860_TEMP_MSB 0x13
#define LP8860_TEMP_LSB 0x14
#define LP8860_DISP_LED_CURR_MSB 0x15
#define LP8860_DISP_LED_CURR_LSB 0x16
#define LP8860_DISP_LED_PWM_MSB 0x17
#define LP8860_DISP_LED_PWM_LSB 0x18
#define LP8860_EEPROM_CNTRL 0x19
#define LP8860_EEPROM_UNLOCK 0x1a
#define LP8860_EEPROM_REG_0 0x60
#define LP8860_EEPROM_REG_1 0x61
#define LP8860_EEPROM_REG_2 0x62
#define LP8860_EEPROM_REG_3 0x63
#define LP8860_EEPROM_REG_4 0x64
#define LP8860_EEPROM_REG_5 0x65
#define LP8860_EEPROM_REG_6 0x66
#define LP8860_EEPROM_REG_7 0x67
#define LP8860_EEPROM_REG_8 0x68
#define LP8860_EEPROM_REG_9 0x69
#define LP8860_EEPROM_REG_10 0x6a
#define LP8860_EEPROM_REG_11 0x6b
#define LP8860_EEPROM_REG_12 0x6c
#define LP8860_EEPROM_REG_13 0x6d
#define LP8860_EEPROM_REG_14 0x6e
#define LP8860_EEPROM_REG_15 0x6f
#define LP8860_EEPROM_REG_16 0x70
#define LP8860_EEPROM_REG_17 0x71
#define LP8860_EEPROM_REG_18 0x72
#define LP8860_EEPROM_REG_19 0x73
#define LP8860_EEPROM_REG_20 0x74
#define LP8860_EEPROM_REG_21 0x75
#define LP8860_EEPROM_REG_22 0x76
#define LP8860_EEPROM_REG_23 0x77
#define LP8860_EEPROM_REG_24 0x78
#define LP8860_LOCK_EEPROM 0x00
#define LP8860_UNLOCK_EEPROM 0x01
#define LP8860_PROGRAM_EEPROM 0x02
#define LP8860_EEPROM_CODE_1 0x08
#define LP8860_EEPROM_CODE_2 0xba
#define LP8860_EEPROM_CODE_3 0xef
#define LP8860_CLEAR_FAULTS 0x01
#define LP8860_DISP_LED_NAME "display_cluster"
/**
* struct lp8860_led -
* @lock - Lock for reading/writing the device
* @work - Work item used to off load the brightness register writes
* @client - Pointer to the I2C client
* @led_dev - led class device pointer
* @regmap - Devices register map
* @eeprom_regmap - EEPROM register map
* @enable_gpio - VDDIO/EN gpio to enable communication interface
* @regulator - LED supply regulator pointer
* @brightness - Current brightness value requested
* @label - LED label
**/
struct lp8860_led {
struct mutex lock;
struct work_struct work;
struct i2c_client *client;
struct led_classdev led_dev;
struct regmap *regmap;
struct regmap *eeprom_regmap;
struct gpio_desc *enable_gpio;
struct regulator *regulator;
enum led_brightness brightness;
const char *label;
};
struct lp8860_eeprom_reg {
uint8_t reg;
uint8_t value;
};
static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
{ LP8860_EEPROM_REG_0, 0xed },
{ LP8860_EEPROM_REG_1, 0xdf },
{ LP8860_EEPROM_REG_2, 0xdc },
{ LP8860_EEPROM_REG_3, 0xf0 },
{ LP8860_EEPROM_REG_4, 0xdf },
{ LP8860_EEPROM_REG_5, 0xe5 },
{ LP8860_EEPROM_REG_6, 0xf2 },
{ LP8860_EEPROM_REG_7, 0x77 },
{ LP8860_EEPROM_REG_8, 0x77 },
{ LP8860_EEPROM_REG_9, 0x71 },
{ LP8860_EEPROM_REG_10, 0x3f },
{ LP8860_EEPROM_REG_11, 0xb7 },
{ LP8860_EEPROM_REG_12, 0x17 },
{ LP8860_EEPROM_REG_13, 0xef },
{ LP8860_EEPROM_REG_14, 0xb0 },
{ LP8860_EEPROM_REG_15, 0x87 },
{ LP8860_EEPROM_REG_16, 0xce },
{ LP8860_EEPROM_REG_17, 0x72 },
{ LP8860_EEPROM_REG_18, 0xe5 },
{ LP8860_EEPROM_REG_19, 0xdf },
{ LP8860_EEPROM_REG_20, 0x35 },
{ LP8860_EEPROM_REG_21, 0x06 },
{ LP8860_EEPROM_REG_22, 0xdc },
{ LP8860_EEPROM_REG_23, 0x88 },
{ LP8860_EEPROM_REG_24, 0x3E },
};
static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
{
int ret;
mutex_lock(&led->lock);
if (lock == LP8860_UNLOCK_EEPROM) {
ret = regmap_write(led->regmap,
LP8860_EEPROM_UNLOCK,
LP8860_EEPROM_CODE_1);
if (ret) {
dev_err(&led->client->dev, "EEPROM Unlock failed\n");
goto out;
}
ret = regmap_write(led->regmap,
LP8860_EEPROM_UNLOCK,
LP8860_EEPROM_CODE_2);
if (ret) {
dev_err(&led->client->dev, "EEPROM Unlock failed\n");
goto out;
}
ret = regmap_write(led->regmap,
LP8860_EEPROM_UNLOCK,
LP8860_EEPROM_CODE_3);
if (ret) {
dev_err(&led->client->dev, "EEPROM Unlock failed\n");
goto out;
}
} else {
ret = regmap_write(led->regmap,
LP8860_EEPROM_UNLOCK,
LP8860_LOCK_EEPROM);
}
out:
mutex_unlock(&led->lock);
return ret;
}
static int lp8860_fault_check(struct lp8860_led *led)
{
int ret, fault;
unsigned int read_buf;
ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
if (ret)
goto out;
fault = read_buf;
ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
if (ret)
goto out;
fault |= read_buf;
/* Attempt to clear any faults */
if (fault)
ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
LP8860_CLEAR_FAULTS);
out:
return ret;
}
static void lp8860_led_brightness_work(struct work_struct *work)
{
struct lp8860_led *led = container_of(work, struct lp8860_led, work);
int ret;
int disp_brightness = led->brightness * 255;
mutex_lock(&led->lock);
ret = lp8860_fault_check(led);
if (ret) {
dev_err(&led->client->dev, "Cannot read/clear faults\n");
goto out;
}
ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
(disp_brightness & 0xff00) >> 8);
if (ret) {
dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
goto out;
}
ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
disp_brightness & 0xff);
if (ret) {
dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
goto out;
}
out:
mutex_unlock(&led->lock);
}
static void lp8860_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
struct lp8860_led *led =
container_of(led_cdev, struct lp8860_led, led_dev);
led->brightness = brt_val;
schedule_work(&led->work);
}
static int lp8860_init(struct lp8860_led *led)
{
unsigned int read_buf;
int ret, i, reg_count;
if (led->enable_gpio)
gpiod_direction_output(led->enable_gpio, 1);
ret = lp8860_fault_check(led);
if (ret)
goto out;
ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
if (ret)
goto out;
ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
if (ret) {
dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
goto out;
}
reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
for (i = 0; i < reg_count; i++) {
ret = regmap_write(led->eeprom_regmap,
lp8860_eeprom_disp_regs[i].reg,
lp8860_eeprom_disp_regs[i].value);
if (ret) {
dev_err(&led->client->dev, "Failed writing EEPROM\n");
goto out;
}
}
ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
if (ret)
goto out;
ret = regmap_write(led->regmap,
LP8860_EEPROM_CNTRL,
LP8860_PROGRAM_EEPROM);
if (ret)
dev_err(&led->client->dev, "Failed programming EEPROM\n");
out:
if (ret)
if (led->enable_gpio)
gpiod_direction_output(led->enable_gpio, 0);
return ret;
}
static struct reg_default lp8860_reg_defs[] = {
{ LP8860_DISP_CL1_BRT_MSB, 0x00},
{ LP8860_DISP_CL1_BRT_LSB, 0x00},
{ LP8860_DISP_CL1_CURR_MSB, 0x00},
{ LP8860_DISP_CL1_CURR_LSB, 0x00},
{ LP8860_CL2_BRT_MSB, 0x00},
{ LP8860_CL2_BRT_LSB, 0x00},
{ LP8860_CL2_CURRENT, 0x00},
{ LP8860_CL3_BRT_MSB, 0x00},
{ LP8860_CL3_BRT_LSB, 0x00},
{ LP8860_CL3_CURRENT, 0x00},
{ LP8860_CL4_BRT_MSB, 0x00},
{ LP8860_CL4_BRT_LSB, 0x00},
{ LP8860_CL4_CURRENT, 0x00},
{ LP8860_CONFIG, 0x00},
{ LP8860_FAULT_CLEAR, 0x00},
{ LP8860_EEPROM_CNTRL, 0x80},
{ LP8860_EEPROM_UNLOCK, 0x00},
};
static const struct regmap_config lp8860_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP8860_EEPROM_UNLOCK,
.reg_defaults = lp8860_reg_defs,
.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
.cache_type = REGCACHE_NONE,
};
static struct reg_default lp8860_eeprom_defs[] = {
{ LP8860_EEPROM_REG_0, 0x00 },
{ LP8860_EEPROM_REG_1, 0x00 },
{ LP8860_EEPROM_REG_2, 0x00 },
{ LP8860_EEPROM_REG_3, 0x00 },
{ LP8860_EEPROM_REG_4, 0x00 },
{ LP8860_EEPROM_REG_5, 0x00 },
{ LP8860_EEPROM_REG_6, 0x00 },
{ LP8860_EEPROM_REG_7, 0x00 },
{ LP8860_EEPROM_REG_8, 0x00 },
{ LP8860_EEPROM_REG_9, 0x00 },
{ LP8860_EEPROM_REG_10, 0x00 },
{ LP8860_EEPROM_REG_11, 0x00 },
{ LP8860_EEPROM_REG_12, 0x00 },
{ LP8860_EEPROM_REG_13, 0x00 },
{ LP8860_EEPROM_REG_14, 0x00 },
{ LP8860_EEPROM_REG_15, 0x00 },
{ LP8860_EEPROM_REG_16, 0x00 },
{ LP8860_EEPROM_REG_17, 0x00 },
{ LP8860_EEPROM_REG_18, 0x00 },
{ LP8860_EEPROM_REG_19, 0x00 },
{ LP8860_EEPROM_REG_20, 0x00 },
{ LP8860_EEPROM_REG_21, 0x00 },
{ LP8860_EEPROM_REG_22, 0x00 },
{ LP8860_EEPROM_REG_23, 0x00 },
{ LP8860_EEPROM_REG_24, 0x00 },
};
static const struct regmap_config lp8860_eeprom_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP8860_EEPROM_REG_24,
.reg_defaults = lp8860_eeprom_defs,
.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
.cache_type = REGCACHE_NONE,
};
static int lp8860_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct lp8860_led *led;
struct device_node *np = client->dev.of_node;
led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->label = LP8860_DISP_LED_NAME;
if (client->dev.of_node) {
ret = of_property_read_string(np, "label", &led->label);
if (ret) {
dev_err(&client->dev, "Missing label in dt\n");
return -EINVAL;
}
}
led->enable_gpio = devm_gpiod_get(&client->dev, "enable");
if (IS_ERR(led->enable_gpio))
led->enable_gpio = NULL;
else
gpiod_direction_output(led->enable_gpio, 0);
led->regulator = devm_regulator_get(&client->dev, "vled");
if (IS_ERR(led->regulator))
led->regulator = NULL;
led->client = client;
led->led_dev.name = led->label;
led->led_dev.max_brightness = LED_FULL;
led->led_dev.brightness_set = lp8860_brightness_set;
mutex_init(&led->lock);
INIT_WORK(&led->work, lp8860_led_brightness_work);
i2c_set_clientdata(client, led);
led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
if (IS_ERR(led->regmap)) {
ret = PTR_ERR(led->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
if (IS_ERR(led->eeprom_regmap)) {
ret = PTR_ERR(led->eeprom_regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
ret = lp8860_init(led);
if (ret)
return ret;
ret = led_classdev_register(&client->dev, &led->led_dev);
if (ret) {
dev_err(&client->dev, "led register err: %d\n", ret);
return ret;
}
return 0;
}
static int lp8860_remove(struct i2c_client *client)
{
struct lp8860_led *led = i2c_get_clientdata(client);
int ret;
led_classdev_unregister(&led->led_dev);
cancel_work_sync(&led->work);
if (led->enable_gpio)
gpiod_direction_output(led->enable_gpio, 0);
if (led->regulator) {
ret = regulator_disable(led->regulator);
if (ret)
dev_err(&led->client->dev,
"Failed to disable regulator\n");
}
return 0;
}
static const struct i2c_device_id lp8860_id[] = {
{ "lp8860", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lp8860_id);
#ifdef CONFIG_OF
static const struct of_device_id of_lp8860_leds_match[] = {
{ .compatible = "ti,lp8860", },
{},
};
MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
#endif
static struct i2c_driver lp8860_driver = {
.driver = {
.name = "lp8860",
.of_match_table = of_match_ptr(of_lp8860_leds_match),
},
.probe = lp8860_probe,
.remove = lp8860_remove,
.id_table = lp8860_id,
};
module_i2c_driver(lp8860_driver);
MODULE_DESCRIPTION("Texas Instruments LP8860 LED drvier");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL");

18
drivers/leds/leds-regulator.c
View File

@ -153,24 +153,21 @@ static int regulator_led_probe(struct platform_device *pdev)
return -ENODEV;
}
vcc = regulator_get_exclusive(&pdev->dev, "vled");
vcc = devm_regulator_get_exclusive(&pdev->dev, "vled");
if (IS_ERR(vcc)) {
dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
return PTR_ERR(vcc);
}
led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
if (led == NULL) {
ret = -ENOMEM;
goto err_vcc;
}
if (led == NULL)
return -ENOMEM;
led->cdev.max_brightness = led_regulator_get_max_brightness(vcc);
if (pdata->brightness > led->cdev.max_brightness) {
dev_err(&pdev->dev, "Invalid default brightness %d\n",
pdata->brightness);
ret = -EINVAL;
goto err_vcc;
return -EINVAL;
}
led->value = pdata->brightness;
@ -191,7 +188,7 @@ static int regulator_led_probe(struct platform_device *pdev)
ret = led_classdev_register(&pdev->dev, &led->cdev);
if (ret < 0) {
cancel_work_sync(&led->work);
goto err_vcc;
return ret;
}
/* to expose the default value to userspace */
@ -201,10 +198,6 @@ static int regulator_led_probe(struct platform_device *pdev)
regulator_led_set_value(led);
return 0;
err_vcc:
regulator_put(vcc);
return ret;
}
static int regulator_led_remove(struct platform_device *pdev)
@ -214,7 +207,6 @@ static int regulator_led_remove(struct platform_device *pdev)
led_classdev_unregister(&led->cdev);
cancel_work_sync(&led->work);
regulator_led_disable(led);
regulator_put(led->vcc);
return 0;
}

71
drivers/leds/leds-syscon.c
View File

@ -18,10 +18,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* This driver provides system reboot functionality for APM X-Gene SoC.
* For system shutdown, this is board specify. If a board designer
* implements GPIO shutdown, use the gpio-poweroff.c driver.
*/
#include <linux/io.h>
#include <linux/of_device.h>
@ -70,39 +66,13 @@ static void syscon_led_set(struct led_classdev *led_cdev,
dev_err(sled->cdev.dev, "error updating LED status\n");
}
static const struct of_device_id syscon_match[] = {
{ .compatible = "syscon", },
{},
};
static int __init syscon_leds_init(void)
static int __init syscon_leds_spawn(struct device_node *np,
struct device *dev,
struct regmap *map)
{
const struct of_device_id *devid;
struct device_node *np;
struct device_node *child;
struct regmap *map;
struct platform_device *pdev;
struct device *dev;
int ret;
np = of_find_matching_node_and_match(NULL, syscon_match,
&devid);
if (!np)
return -ENODEV;
map = syscon_node_to_regmap(np);
if (IS_ERR(map))
return PTR_ERR(map);
/*
* If the map is there, the device should be there, we allocate
* memory on the syscon device's behalf here.
*/
pdev = of_find_device_by_node(np);
if (!pdev)
return -ENODEV;
dev = &pdev->dev;
for_each_available_child_of_node(np, child) {
struct syscon_led *sled;
const char *state;
@ -150,7 +120,6 @@ static int __init syscon_leds_init(void)
if (ret < 0)
return ret;
}
}
sled->cdev.brightness_set = syscon_led_set;
@ -160,7 +129,39 @@ static int __init syscon_leds_init(void)
dev_info(dev, "registered LED %s\n", sled->cdev.name);
}
return 0;
}
return 0;
static int __init syscon_leds_init(void)
{
struct device_node *np;
for_each_of_allnodes(np) {
struct platform_device *pdev;
struct regmap *map;
int ret;
if (!of_device_is_compatible(np, "syscon"))
continue;
map = syscon_node_to_regmap(np);
if (IS_ERR(map)) {
pr_err("error getting regmap for syscon LEDs\n");
continue;
}
/*
* If the map is there, the device should be there, we allocate
* memory on the syscon device's behalf here.
*/
pdev = of_find_device_by_node(np);
if (!pdev)
return -ENODEV;
ret = syscon_leds_spawn(np, &pdev->dev, map);
if (ret)
dev_err(&pdev->dev, "could not spawn syscon LEDs\n");
}
return 0;
}
device_initcall(syscon_leds_init);

20
drivers/leds/leds.h
View File

@ -17,16 +17,28 @@
#include <linux/rwsem.h>
#include <linux/leds.h>
static inline void __led_set_brightness(struct led_classdev *led_cdev,
static inline void led_set_brightness_async(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value > led_cdev->max_brightness)
value = led_cdev->max_brightness;
led_cdev->brightness = value;
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (!(led_cdev->flags & LED_SUSPENDED))
led_cdev->brightness_set(led_cdev, value);
}
static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
enum led_brightness value)
{
int ret = 0;
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (!(led_cdev->flags & LED_SUSPENDED))
ret = led_cdev->brightness_set_sync(led_cdev,
led_cdev->brightness);
return ret;
}
static inline int led_get_brightness(struct led_classdev *led_cdev)
{
return led_cdev->brightness;

8
drivers/leds/trigger/ledtrig-backlight.c
View File

@ -51,9 +51,9 @@ static int fb_notifier_callback(struct notifier_block *p,
if ((n->old_status == UNBLANK) ^ n->invert) {
n->brightness = led->brightness;
__led_set_brightness(led, LED_OFF);
led_set_brightness_async(led, LED_OFF);
} else {
__led_set_brightness(led, n->brightness);
led_set_brightness_async(led, n->brightness);
}
n->old_status = new_status;
@ -89,9 +89,9 @@ static ssize_t bl_trig_invert_store(struct device *dev,
/* After inverting, we need to update the LED. */
if ((n->old_status == BLANK) ^ n->invert)
__led_set_brightness(led, LED_OFF);
led_set_brightness_async(led, LED_OFF);
else
__led_set_brightness(led, n->brightness);
led_set_brightness_async(led, n->brightness);
return num;
}

2
drivers/leds/trigger/ledtrig-default-on.c
View File

@ -19,7 +19,7 @@
static void defon_trig_activate(struct led_classdev *led_cdev)
{
__led_set_brightness(led_cdev, led_cdev->max_brightness);
led_set_brightness_async(led_cdev, led_cdev->max_brightness);
}
static struct led_trigger defon_led_trigger = {

6
drivers/leds/trigger/ledtrig-gpio.c
View File

@ -54,12 +54,12 @@ static void gpio_trig_work(struct work_struct *work)
if (tmp) {
if (gpio_data->desired_brightness)
__led_set_brightness(gpio_data->led,
led_set_brightness_async(gpio_data->led,
gpio_data->desired_brightness);
else
__led_set_brightness(gpio_data->led, LED_FULL);
led_set_brightness_async(gpio_data->led, LED_FULL);
} else {
__led_set_brightness(gpio_data->led, LED_OFF);
led_set_brightness_async(gpio_data->led, LED_OFF);
}
}

2
drivers/leds/trigger/ledtrig-heartbeat.c
View File

@ -74,7 +74,7 @@ static void led_heartbeat_function(unsigned long data)
break;
}
__led_set_brightness(led_cdev, brightness);
led_set_brightness_async(led_cdev, brightness);
mod_timer(&heartbeat_data->timer, jiffies + delay);
}

4
drivers/leds/trigger/ledtrig-oneshot.c
View File

@ -63,9 +63,9 @@ static ssize_t led_invert_store(struct device *dev,
oneshot_data->invert = !!state;
if (oneshot_data->invert)
__led_set_brightness(led_cdev, LED_FULL);
led_set_brightness_async(led_cdev, LED_FULL);
else
__led_set_brightness(led_cdev, LED_OFF);
led_set_brightness_async(led_cdev, LED_OFF);
return size;
}

10
drivers/leds/trigger/ledtrig-transient.c
View File

@ -41,7 +41,7 @@ static void transient_timer_function(unsigned long data)
struct transient_trig_data *transient_data = led_cdev->trigger_data;
transient_data->activate = 0;
__led_set_brightness(led_cdev, transient_data->restore_state);
led_set_brightness_async(led_cdev, transient_data->restore_state);
}
static ssize_t transient_activate_show(struct device *dev,
@ -72,7 +72,8 @@ static ssize_t transient_activate_store(struct device *dev,
if (state == 0 && transient_data->activate == 1) {
del_timer(&transient_data->timer);
transient_data->activate = state;
__led_set_brightness(led_cdev, transient_data->restore_state);
led_set_brightness_async(led_cdev,
transient_data->restore_state);
return size;
}
@ -80,7 +81,7 @@ static ssize_t transient_activate_store(struct device *dev,
if (state == 1 && transient_data->activate == 0 &&
transient_data->duration != 0) {
transient_data->activate = state;
__led_set_brightness(led_cdev, transient_data->state);
led_set_brightness_async(led_cdev, transient_data->state);
transient_data->restore_state =
(transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
mod_timer(&transient_data->timer,
@ -203,7 +204,8 @@ static void transient_trig_deactivate(struct led_classdev *led_cdev)
if (led_cdev->activated) {
del_timer_sync(&transient_data->timer);
__led_set_brightness(led_cdev, transient_data->restore_state);
led_set_brightness_async(led_cdev,
transient_data->restore_state);
device_remove_file(led_cdev->dev, &dev_attr_activate);
device_remove_file(led_cdev->dev, &dev_attr_duration);
device_remove_file(led_cdev->dev, &dev_attr_state);

40
include/linux/leds.h
View File

@ -13,6 +13,7 @@
#define __LINUX_LEDS_H_INCLUDED
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
@ -42,11 +43,20 @@ struct led_classdev {
#define LED_BLINK_ONESHOT (1 << 17)
#define LED_BLINK_ONESHOT_STOP (1 << 18)
#define LED_BLINK_INVERT (1 << 19)
#define LED_SYSFS_DISABLE (1 << 20)
#define SET_BRIGHTNESS_ASYNC (1 << 21)
#define SET_BRIGHTNESS_SYNC (1 << 22)
/* Set LED brightness level */
/* Must not sleep, use a workqueue if needed */
void (*brightness_set)(struct led_classdev *led_cdev,
enum led_brightness brightness);
/*
* Set LED brightness level immediately - it can block the caller for
* the time required for accessing a LED device register.
*/
int (*brightness_set_sync)(struct led_classdev *led_cdev,
enum led_brightness brightness);
/* Get LED brightness level */
enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
@ -85,6 +95,9 @@ struct led_classdev {
/* true if activated - deactivate routine uses it to do cleanup */
bool activated;
#endif
/* Ensures consistent access to the LED Flash Class device */
struct mutex led_access;
};
extern int led_classdev_register(struct device *parent,
@ -151,6 +164,33 @@ extern void led_set_brightness(struct led_classdev *led_cdev,
*/
extern int led_update_brightness(struct led_classdev *led_cdev);
/**
* led_sysfs_disable - disable LED sysfs interface
* @led_cdev: the LED to set
*
* Disable the led_cdev's sysfs interface.
*/
extern void led_sysfs_disable(struct led_classdev *led_cdev);
/**
* led_sysfs_enable - enable LED sysfs interface
* @led_cdev: the LED to set
*
* Enable the led_cdev's sysfs interface.
*/
extern void led_sysfs_enable(struct led_classdev *led_cdev);
/**
* led_sysfs_is_disabled - check if LED sysfs interface is disabled
* @led_cdev: the LED to query
*
* Returns: true if the led_cdev's sysfs interface is disabled.
*/
static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
{
return led_cdev->flags & LED_SYSFS_DISABLE;
}
/*
* LED Triggers
*/