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From: David Dajun Chen on 2 Jul 2010 05:30
LED module of the device driver for DA9052 PMIC device from Dialog
Semiconductor.

Linux Kernel Version: 2.6.34

Signed-off-by: D. Chen <dchen(a)diasemi.com>
---
diff -urpN linux-2.6.34/drivers/leds/Kconfig
linux-2.6.34_test/drivers/leds/Kconfig
--- linux-2.6.34/drivers/leds/Kconfig 2010-05-17 02:17:36.000000000
+0500
+++ linux-2.6.34_test/drivers/leds/Kconfig 2010-07-01
18:16:37.000000000 +0500
@@ -225,6 +225,13 @@ config LEDS_DA903X
This option enables support for on-chip LED drivers found
on Dialog Semiconductor DA9030/DA9034 PMICs.

+config LEDS_DA9052
+ tristate "LED Support for DA9052"
+ depends on PMIC_DA9052
+ help
+ This option enables support for on-chip LED drivers found
+ on Dialog Semiconductor DA9052 PMICs.
+
config LEDS_DAC124S085
tristate "LED Support for DAC124S085 SPI DAC"
depends on SPI
diff -urpN linux-2.6.34/drivers/leds/leds-da9052.c
linux-2.6.34_test/drivers/leds/leds-da9052.c
--- linux-2.6.34/drivers/leds/leds-da9052.c 1970-01-01
05:00:00.000000000 +0500
+++ linux-2.6.34_test/drivers/leds/leds-da9052.c 2010-07-01
18:16:23.000000000 +0500
@@ -0,0 +1,297 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/led.h>
+
+#define DRIVER_NAME "da9052-leds"
+
+#define DA9052_LED4_PRESENT 1
+#define DA9052_LED5_PRESENT 1
+
+
+struct da9052_led_data {
+ struct led_classdev cdev;
+ struct work_struct work;
+ struct da9052 *da9052;
+ int id;
+ int new_brightness;
+ int is_led4_present;
+ int is_led5_present;
+};
+
+#define GPIO14_PIN 2 /* GPO Open Drain */
+#define GPIO14_TYPE 0 /* VDD_IO1 */
+#define GPIO14_MODE 1 /* Output High */
+
+#define GPIO15_PIN 2 /* GPO Open Drain */
+#define GPIO15_TYPE 0 /* VDD_IO1 */
+#define GPIO15_MODE 1 /* Output High */
+
+#define MAXIMUM_PWM 95
+#define MASK_GPIO14 0x0F
+#define MASK_GPIO15 0xF0
+#define GPIO15_PIN_BIT_POSITION 4
+
+static void da9052_led_work(struct work_struct *work)
+{
+ struct da9052_led_data *led = container_of(work,
+ struct da9052_led_data, work);
+ int reg = 0;
+ int led_dim_bit = 0;
+ struct da9052_ssc_msg msg;
+ int ret = 0;
+
+ switch (led->id) {
+ case DA9052_LED_4:
+ reg = DA9052_LED4CONT_REG;
+ led_dim_bit = DA9052_LED4CONT_LED4DIM;
+ break;
+ case DA9052_LED_5:
+ reg = DA9052_LED5CONT_REG;
+ led_dim_bit = DA9052_LED5CONT_LED5DIM;
+ break;
+ }
+
+ if (led->new_brightness > MAXIMUM_PWM)
+ led->new_brightness = MAXIMUM_PWM;
+
+ /* Always enable DIM feature
+ * This feature can be disabled if required
+ */
+ msg.addr = reg;
+ msg.data = led->new_brightness | led_dim_bit;
+
+ da9052_lock(led->da9052);
+ led->da9052->write(led->da9052, &msg);
+ if (ret) {
+ da9052_unlock(led->da9052);
+ return;
+ }
+ da9052_unlock(led->da9052);
+}
+
+static void da9052_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct da9052_led_data *led;
+
+ led = container_of(led_cdev, struct da9052_led_data, cdev);
+ led->new_brightness = value;
+ schedule_work(&led->work);
+}
+
+static int __devinit da9052_led_setup(struct da9052_led_data *led)
+{
+ int reg = 0;
+ int ret = 0;
+
+ struct da9052_ssc_msg msg;
+
+ switch (led->id) {
+ case DA9052_LED_4:
+ reg = DA9052_LED4CONT_REG;
+ break;
+ case DA9052_LED_5:
+ reg = DA9052_LED5CONT_REG;
+ break;
+ }
+
+ msg.addr = reg;
+ msg.data = 0;
+
+ da9052_lock(led->da9052);
+ ret = led->da9052->write(led->da9052, &msg);
+ if (ret) {
+ da9052_unlock(led->da9052);
+ return ret;
+ }
+ da9052_unlock(led->da9052);
+ return ret;
+}
+
+static int __devinit da9052_leds_prepare(struct da9052_led_data *led)
+{
+ int ret = 0;
+ struct da9052_ssc_msg msg;
+
+ if (1 == led->is_led4_present) {
+ msg.addr = DA9052_GPIO1415_REG;
+ msg.data = 0;
+
+ da9052_lock(led->da9052);
+ ret = led->da9052->read(led->da9052, &msg);
+ if (ret)
+ goto out;
+ msg.data = msg.data & ~(MASK_GPIO14);
+ msg.data = msg.data | (
+ GPIO14_PIN |
+ (GPIO14_TYPE ?
DA9052_GPIO1415_GPIO14TYPE : 0) |
+ (GPIO14_MODE ?
DA9052_GPIO1415_GPIO14MODE : 0));
+
+ ret = led->da9052->write(led->da9052, &msg);
+ if (ret)
+ goto out;
+ }
+
+ if (1 == led->is_led4_present) {
+ msg.addr = DA9052_GPIO1415_REG;
+ msg.data = 0;
+
+ ret = led->da9052->read(led->da9052, &msg);
+ if (ret)
+ goto out;
+ msg.data = msg.data & ~(MASK_GPIO15);
+ msg.data = msg.data |
+ (((GPIO15_PIN << GPIO15_PIN_BIT_POSITION) |
+ (GPIO15_TYPE ?
DA9052_GPIO1415_GPIO15TYPE : 0) |
+ (GPIO15_MODE ?
DA9052_GPIO1415_GPIO15MODE : 0))
+ );
+ ret = led->da9052->write(led->da9052, &msg);
+ if (ret)
+ goto out;
+ }
+
+ da9052_unlock(led->da9052);
+out:
+ da9052_unlock(led->da9052);
+ return ret;
+}
+
+static int __devinit da9052_led_probe(struct platform_device *pdev)
+{
+ struct da9052_leds_platform_data *pdata =
dev_get_platdata(&pdev->dev);
+ struct da9052_led_platform_data *led_cur;
+ struct da9052_led_data *led, *led_dat;
+ int ret, i;
+ int init_led = 0;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "missing platform data\n");
+ return -ENODEV;
+ }
+
+ if (pdata->num_leds < 1 || pdata->num_leds > DA9052_LED_MAX) {
+ dev_err(&pdev->dev, "Invalid led count %d\n",
pdata->num_leds);
+ return -EINVAL;
+ }
+
+ led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
+ if (led == NULL) {
+ dev_err(&pdev->dev, "failed to alloc memory\n");
+ return -ENOMEM;
+ }
+
+ led->is_led4_present = DA9052_LED4_PRESENT;
+ led->is_led5_present = DA9052_LED5_PRESENT;
+
+ ret = da9052_leds_prepare(led);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to init led driver\n");
+ goto err_free;
+ }
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ led_dat = &led[i];
+ led_cur = &pdata->led[i];
+
+ if (led_cur->id > DA9052_LED_MAX || led_cur->id < 0) {
+ dev_err(&pdev->dev, "invalid id %d\n",
led_cur->id);
+ ret = -EINVAL;
+ goto err_register;
+ }
+
+ if (init_led & (1 << led_cur->id)) {
+ dev_err(&pdev->dev, "led %d already
initialized\n",
+ led_cur->id);
+ ret = -EINVAL;
+ goto err_register;
+ }
+
+ init_led |= 1 << led_cur->id;
+ led_dat->cdev.name = led_cur->name;
+ led_dat->cdev.default_trigger =
led_cur->default_trigger;
+ led_dat->cdev.brightness_set = da9052_led_set;
+ led_dat->cdev.brightness = LED_OFF;
+ led_dat->id = led_cur->id;
+ led_dat->da9052 = dev_get_drvdata(pdev->dev.parent);
+
+ INIT_WORK(&led_dat->work, da9052_led_work);
+
+ ret = led_classdev_register(pdev->dev.parent,
&led_dat->cdev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register led
%d\n",
+ led_dat->id);
+ goto err_register;
+ }
+
+ ret = da9052_led_setup(led_dat);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to init led %d\n",
+ led_dat->id);
+ i++;
+ goto err_register;
+ }
+ }
+
+ platform_set_drvdata(pdev, led);
+ return 0;
+
+err_register:
+ for (i = i - 1; i >= 0; i--) {
+ led_classdev_unregister(&led[i].cdev);
+ cancel_work_sync(&led[i].work);
+ }
+
+err_free:
+ kfree(led);
+ return ret;
+}
+
+static int __devexit da9052_led_remove(struct platform_device *pdev)
+{
+ struct da9052_leds_platform_data *pdata =
dev_get_platdata(&pdev->dev);
+ struct da9052_led_data *led = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ da9052_led_setup(&led[i]);
+ led_classdev_unregister(&led[i].cdev);
+ cancel_work_sync(&led[i].work);
+ }
+
+ kfree(led);
+ return 0;
+}
+
+static struct platform_driver da9052_led_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = da9052_led_probe,
+ .remove = __devexit_p(da9052_led_remove),
+};
+
+static int __init da9052_led_init(void)
+{
+ return platform_driver_register(&da9052_led_driver);
+}
+module_init(da9052_led_init);
+
+static void __exit da9052_led_exit(void)
+{
+ platform_driver_unregister(&da9052_led_driver);
+}
+module_exit(da9052_led_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen(a)diasemi.com>")
+MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
diff -urpN linux-2.6.34/drivers/leds/Makefile
linux-2.6.34_test/drivers/leds/Makefile
--- linux-2.6.34/drivers/leds/Makefile 2010-05-17 02:17:36.000000000
+0500
+++ linux-2.6.34_test/drivers/leds/Makefile 2010-07-01
18:16:31.000000000 +0500
@@ -27,6 +27,7 @@ obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.
obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
+obj-$(CONFIG_LEDS_DA9052) += leds-da9052.o
obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
diff -urpN linux-2.6.34/include/linux/mfd/da9052/led.h
linux-2.6.34_test/include/linux/mfd/da9052/led.h
--- linux-2.6.34/include/linux/mfd/da9052/led.h 1970-01-01
05:00:00.000000000 +0500
+++ linux-2.6.34_test/include/linux/mfd/da9052/led.h 2010-07-01
18:17:11.000000000 +0500
@@ -0,0 +1,18 @@
+#ifndef DA9052_LED_H
+#define DA9052_LED_H
+
+struct da9052_led_platform_data {
+#define DA9052_LED_4 4
+#define DA9052_LED_5 5
+#define DA9052_LED_MAX 2
+ int id;
+ const char *name;
+ const char *default_trigger;
+};
+
+struct da9052_leds_platform_data {
+ int num_leds;
+ struct da9052_led_platform_data *led;
+};
+
+#endif /* __LINUX_MFD_DA9052_H */
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Pages: 1
Prev: [PATCHSET] workqueue: implement and use WQ_UNBOUND
Next: [PATCH 4/4] async: use workqueue for worker pool