[PATCH 3/3] leds: ab8500-led: led driver based on ab8500 pwm
From: Arun Murthy
Date: Thu Aug 26 2010 - 03:14:21 EST
This patch adds led class driver for controlling u8500 leds and
backlight. LED intensity is controlled by by Ananlog Baseband Chip
AB8500 Pulse Width Modulation(pwm).
Signed-off-by: Arun Murthy <arun.murthy@xxxxxxxxxxxxxx>
Acked-by: Mattias Wallin <mattias.wallin@xxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
---
drivers/leds/Kconfig | 9 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-ab8500.c | 201 ++++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/ab8500-core.c | 3 +
include/linux/mfd/ab8500.h | 1 +
5 files changed, 215 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/leds-ab8500.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e411262..8e554af 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -26,6 +26,15 @@ config LEDS_88PM860X
This option enables support for on-chip LED drivers found on Marvell
Semiconductor 88PM8606 PMIC.
+config LEDS_AB8500
+ bool "ab8500-pwm: led driver"
+ depends on LEDS_CLASS && AB8500_CORE
+ select AB8500_PWM
+ help
+ This option enables led class driver support for ab8500 pwm devices.
+ If in doubt, it's safe to enable this option; it doesn't kick
+ in unless the board's description says it's wired that way.
+
config LEDS_ATMEL_PWM
tristate "LED Support using Atmel PWM outputs"
depends on ATMEL_PWM
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 7d6b958..7ba6448 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o
obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o
obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
+obj-$(CONFIG_LEDS_AB8500) += leds-ab8500.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/leds-ab8500.c b/drivers/leds/leds-ab8500.c
new file mode 100644
index 0000000..9a0a9e9
--- /dev/null
+++ b/drivers/leds/leds-ab8500.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Dushyanth S R <dushyanth.sr@xxxxxxxxxxxxxx>
+ * Author: Arun R Murthy <arun.murthy@xxxxxxxxxxxxxx>
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/mfd/abx500/ab8500-pwm.h>
+
+struct ab8500_led {
+ struct led_classdev ab8500_led_cdev;
+ struct ab8500_pwm_pdata *pwm;
+ struct device *dev;
+};
+
+static void ab8500_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct ab8500_led *led = container_of(led_cdev,
+ struct ab8500_led,
+ ab8500_led_cdev);
+ int cnt;
+
+ if (value > led_cdev->max_brightness)
+ value = led_cdev->max_brightness;
+
+ for (cnt = 0; cnt < MAX_PWM_CTRL; cnt++) {
+ if (!led->pwm->pwm_no[cnt])
+ break;
+ ab8500_pwm_set_int(led->dev,
+ led_cdev->max_brightness,
+ value,
+ led->pwm->pwm_no[cnt]);
+ }
+ led_cdev->brightness = value;
+}
+
+enum led_brightness (ab8500_led_brightness_get)
+ (struct led_classdev *led_cdev)
+{
+ struct ab8500_led *led = container_of(led_cdev,
+ struct ab8500_led,
+ ab8500_led_cdev);
+ int val;
+
+ val = ab8500_pwm_get_int(led->dev,
+ led_cdev->max_brightness,
+ led->pwm->pwm_no[0]);
+ return val;
+}
+
+static int __devinit ab8500_led_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ int cnt;
+ struct ab8500_led *led, *led_data;
+ struct ab8500_platform_data *plat;
+ struct ab8500_pwm_pdata *cur_led;
+ struct ab8500 *ab8500;
+
+ led_data = kzalloc(sizeof(struct ab8500_led) * TOTAL_NO_PWM,
+ GFP_KERNEL);
+ if (!led_data)
+ return -ENOMEM;
+
+ led = led_data;
+ ab8500 = dev_get_drvdata(pdev->dev.parent);
+ plat = dev_get_platdata(ab8500->dev);
+ if (plat->led == NULL) {
+ kfree(led_data);
+ return -EINVAL;
+ }
+
+ for (cnt = 0; cnt < TOTAL_NO_PWM; cnt++) {
+ cur_led = &plat->led[cnt];
+ if (!cur_led->name)
+ break;
+ led = &led_data[cnt];
+ led->pwm = cur_led;
+ led->dev = &pdev->dev;
+
+ led->ab8500_led_cdev.name = cur_led->name;
+ led->ab8500_led_cdev.max_brightness = cur_led->max_intensity;
+ led->ab8500_led_cdev.brightness_set = ab8500_led_brightness_set;
+ led->ab8500_led_cdev.brightness_get = ab8500_led_brightness_get;
+ ret = led_classdev_register(&pdev->dev, &led->ab8500_led_cdev);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "led device class register failed\n");
+ while (cnt--) {
+ led = &led_data[cnt];
+ led_classdev_unregister(&led->ab8500_led_cdev);
+ }
+ kfree(led);
+ return ret;
+ }
+ }
+ dev_info(&pdev->dev, "led driver probe success\n");
+ return ret;
+}
+
+#ifdef CONFIG_PM
+static int ab8500_led_suspend(struct device *dev)
+{
+ int cnt;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct ab8500_led *led = platform_get_drvdata(pdev);
+ struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+ struct ab8500_platform_data *plat =
+ dev_get_platdata(ab8500->dev);
+ struct ab8500_pwm_pdata *cur_led;
+
+ for (cnt = 0; cnt < TOTAL_NO_PWM; cnt++) {
+ cur_led = &plat->led[cnt];
+ if (!cur_led->name)
+ break;
+ led_classdev_suspend(&led[cnt].ab8500_led_cdev);
+ }
+
+ return 0;
+}
+
+static int ab8500_led_resume(struct device *dev)
+{
+ int cnt;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct ab8500_led *led = platform_get_drvdata(pdev);
+ struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+ struct ab8500_platform_data *plat =
+ dev_get_platdata(ab8500->dev);
+ struct ab8500_pwm_pdata *cur_led;
+
+ for (cnt = 0; cnt < TOTAL_NO_PWM; cnt++) {
+ cur_led = &plat->led[cnt];
+ if (!cur_led->name)
+ break;
+ led_classdev_resume(&led[cnt].ab8500_led_cdev);
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops ab8500_led_pm_ops = {
+ .suspend = ab8500_led_suspend,
+ .resume = ab8500_led_resume,
+};
+#endif
+
+static int __devexit ab8500_led_remove(struct platform_device *pdev)
+{
+ struct ab8500_led *led = platform_get_drvdata(pdev);
+ struct ab8500_pwm_pdata *cur_led;
+ struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+ struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
+ int cnt;
+
+ for (cnt = 0; cnt < TOTAL_NO_PWM; cnt++) {
+ cur_led = &plat->led[cnt];
+ if (!cur_led->name)
+ break;
+ led_classdev_unregister(&led[cnt].ab8500_led_cdev);
+ }
+ kfree(led);
+
+ return 0;
+}
+
+static struct platform_driver ab8500_led_driver = {
+ .driver = {
+ .name = "ab8500-pwm-led",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &ab8500_led_pm_ops,
+#endif
+ },
+ .probe = ab8500_led_probe,
+ .remove = __devexit_p(ab8500_led_remove),
+};
+
+static int __init ab8500_led_init(void)
+{
+ return platform_driver_register(&ab8500_led_driver);
+}
+
+static void __exit ab8500_led_exit(void)
+{
+ platform_driver_unregister(&ab8500_led_driver);
+}
+
+module_init(ab8500_led_init);
+module_exit(ab8500_led_exit);
+
+MODULE_AUTHOR("Dushyanth S R, Arun Murthy");
+MODULE_DESCRIPTION("ab8500-pwm: led driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index b193d45..84a84a8 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -397,6 +397,9 @@ static struct mfd_cell ab8500_devs[] = {
{
.name = "ab8500-pwm-bl",
},
+ {
+ .name = "ab8500-pwm-led",
+ },
{ .name = "ab8500-charger", },
{ .name = "ab8500-audio", },
{ .name = "ab8500-usb", },
diff --git a/include/linux/mfd/ab8500.h b/include/linux/mfd/ab8500.h
index cb8328b..b420dbb 100644
--- a/include/linux/mfd/ab8500.h
+++ b/include/linux/mfd/ab8500.h
@@ -150,6 +150,7 @@ struct ab8500_platform_data {
void (*init) (struct ab8500 *);
struct regulator_init_data *regulator[AB8500_NUM_REGULATORS];
struct ab8500_pwm_pdata *pwm;
+ struct ab8500_pwm_pdata *led;
};
extern int __devinit ab8500_init(struct ab8500 *ab8500);
--
1.6.3.3
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