[PATCHv1 10/11] LEDS: LED module of DA9052 PMIC driver

From: Ashish Jangam
Date: Wed Apr 13 2011 - 08:18:47 EST

Hi,

LED Driver for Dialog Semiconductor DA9052 PMICs.

Changes made since last submission:
. Modified the platform data structure
. Ported the driver to Linux kernel 2.6.38.2

Linux Kernel Version: 2.6.38.2

Signed-off-by: D. Chen <dchen@xxxxxxxxxxx>
---
diff -Naur linux-2.6.38.2/drivers/leds/Kconfig wrk_linux-2.6.38.2/drivers/leds/Kconfig
--- linux-2.6.38.2/drivers/leds/Kconfig 2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/leds/Kconfig 2011-04-13 15:24:08.000000000 +0500
@@ -274,6 +274,14 @@
This option enables support for on-chip LED drivers found
on Dialog Semiconductor DA9030/DA9034 PMICs.

+config LEDS_DA9052
+ tristate "Dialog DA9052 LEDS"
+ depends on LEDS_CLASS
+ 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 LEDS_CLASS
diff -Naur linux-2.6.38.2/drivers/leds/leds-da9052.c wrk_linux-2.6.38.2/drivers/leds/leds-da9052.c
--- linux-2.6.38.2/drivers/leds/leds-da9052.c 1970-01-01 05:00:00.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/leds/leds-da9052.c 2011-04-13 15:24:28.000000000 +0500
@@ -0,0 +1,218 @@
+/*
+ * LED Driver for Dialog DA9052
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#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/pdata.h>
+#include <linux/mfd/da9052/gpio.h>
+
+struct da9052_led {
+ struct led_classdev cdev;
+ struct work_struct work;
+ struct da9052 *da9052;
+ u8 led_index;
+ u8 id;
+ int brightness;
+};
+
+u8 led_reg[] = {
+ DA9052_LED_CONT_4_REG,
+ DA9052_LED_CONT_5_REG,
+};
+
+struct da9052_led_platform_data {
+ int led_index[2];
+ struct led_platform_data leds;
+ };
+
+static int da9052_set_led_brightness(struct da9052_led *led)
+{
+ int error;
+
+ error = da9052_reg_write(led->da9052, led_reg[led->led_index],
+ led->brightness | DA9052_LED_CONT_DIM);
+ if (error < 0)
+ dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", error);
+ return error;
+}
+
+static void da9052_led_work(struct work_struct *work)
+{
+ struct da9052_led *led = container_of(work,
+ struct da9052_led, work);
+
+ da9052_set_led_brightness(led);
+}
+
+static void da9052_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct da9052_led *led;
+
+ led = container_of(led_cdev, struct da9052_led, cdev);
+ led->brightness = value;
+ schedule_work(&led->work);
+}
+
+
+static int da9052_configure_leds_gpio(struct da9052_led *led)
+{
+ int error;
+ u8 register_value = DA9052_OUTPUT_OPENDRAIN |
+ DA9052_SUPPLY_VDD_IO1 << 2 | 1 << 3;
+
+ error = da9052_reg_update(led->da9052, DA9052_GPIO_14_15_REG,
+ DA9052_GPIO_MASK_LOWER_NIBBLE,
+ register_value);
+
+ if (error < 0) {
+ dev_err(led->da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", error);
+ return error;
+ }
+
+ error = da9052_reg_update(led->da9052, DA9052_GPIO_14_15_REG,
+ DA9052_GPIO_MASK_UPPER_NIBBLE,
+ register_value << DA9052_GPIO_NIBBLE_SHIFT
+ );
+ if (error < 0)
+ dev_err(led->da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", error);
+
+ return error;
+}
+
+static int __devinit da9052_led_probe(struct platform_device *pdev)
+{
+ struct da9052_pdata *pdata;
+ struct da9052 *da9052;
+ struct gpio_led_platform_data *pled;
+ struct da9052_led *led;
+ int error, i;
+
+ da9052 = dev_get_drvdata(pdev->dev.parent);
+ pdata = da9052->dev->platform_data;
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "No platform data\n");
+ error = -ENODEV;
+ goto err_mem;
+ }
+
+ pled = pdata->pled;
+
+ if (pled == NULL) {
+ dev_err(&pdev->dev, "Failed no platform data for LED\n");
+ return -ENOMEM;
+ }
+
+ led = kzalloc(sizeof(struct da9052_led) * pled->num_leds, GFP_KERNEL);
+ if (led == NULL) {
+ dev_err(&pdev->dev, "Failed to alloc memory\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < pled->num_leds; i++) {
+ led[i].cdev.name = pled->leds[i].name;
+ led[i].cdev.brightness_set = da9052_led_set;
+ led[i].cdev.brightness = LED_OFF;
+ led[i].brightness = 0;
+ led[i].id = i;
+ led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
+ INIT_WORK(&led[i].work, da9052_led_work);
+
+ error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
+ if (error) {
+ dev_err(&pdev->dev, "Failed to register led %d\n", led[i].id);
+ goto err_register;
+ }
+
+ error = da9052_set_led_brightness(&led[i]);
+ if (error) {
+ dev_err(&pdev->dev, "Unable to init led %d\n", led[i].led_index);
+ continue;
+ }
+ }
+ error = da9052_configure_leds_gpio(led);
+ if (error) {
+ dev_err(&pdev->dev, "Failed to configure GPIO Led,%d\n", error);
+ 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_mem:
+ kfree(led);
+ return error;
+}
+
+static int __devexit da9052_led_remove(struct platform_device *pdev)
+{
+ struct da9052_led *led = NULL;
+ struct da9052 *da9052;
+ struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
+ int i;
+
+ led = platform_get_drvdata(pdev);
+ da9052 = dev_get_drvdata(pdev->dev.parent);
+ pdata = da9052->dev->platform_data;
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ led[i].brightness = 0;
+ da9052_set_led_brightness(&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 = "da9052-leds",
+ .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("Dialog Semiconductor Ltd <dchen@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
diff -Naur linux-2.6.38.2/drivers/leds/Makefile wrk_linux-2.6.38.2/drivers/leds/Makefile
--- linux-2.6.38.2/drivers/leds/Makefile 2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/leds/Makefile 2011-04-13 15:24:01.000000000 +0500
@@ -30,6 +30,7 @@
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

Regards,
Ashish J


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