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Date: Thu, 26 Aug 2010 12:20:32 +0530
From: Arun Murthy <arun.murthy@...ricsson.com>
To: <sameo@...ux.intel.com>, <riku.voipio@....fi>
Cc: <linux-kernel@...r.kernel.org>,
<STEricsson_nomadik_linux@...t.st.com>,
<arun.murthy@...ricsson.com>, <linus.walleij@...ricsson.com>,
<srinidhi.kasagar@...ricsson.com>
Subject: [PATCH 3/3] leds: ab8500-led: led driver based on ab8500 pwm
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@...ricsson.com>
Acked-by: Mattias Wallin <mattias.wallin@...ricsson.com>
Acked-by: Linus Walleij <linus.walleij@...ricsson.com>
---
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@...ricsson.com>
+ * Author: Arun R Murthy <arun.murthy@...ricsson.com>
+ * 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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