leds: Add suuport for MAX8997-LED driver
Donggeun Kim [Wed, 14 Dec 2011 09:23:56 +0000 (18:23 +0900)]
This patch enables LED controller in MAX8997 PMIC.

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/leds/Kconfig
drivers/leds/Makefile
drivers/leds/leds-max8997.c [new file with mode: 0644]

index ff203a4..c0e30e8 100644 (file)
@@ -387,6 +387,13 @@ config LEDS_RENESAS_TPU
          pin function. The latter to support brightness control.
          Brightness control is supported but hardware blinking is not.
 
+config LEDS_MAX8997
+       tristate "LED support for MAX8997 PMIC"
+       depends on LEDS_CLASS && MFD_MAX8997
+       help
+         This option enables support for on-chip LED drivers on
+         MAXIM MAX8997 PMIC.
+
 config LEDS_TRIGGERS
        bool "LED Trigger support"
        depends on LEDS_CLASS
index e4f6bf5..17f1e98 100644 (file)
@@ -43,6 +43,7 @@ obj-$(CONFIG_LEDS_NS2)                        += leds-ns2.o
 obj-$(CONFIG_LEDS_NETXBIG)             += leds-netxbig.o
 obj-$(CONFIG_LEDS_ASIC3)               += leds-asic3.o
 obj-$(CONFIG_LEDS_RENESAS_TPU)         += leds-renesas-tpu.o
+obj-$(CONFIG_LEDS_MAX8997)             += leds-max8997.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)          += leds-dac124s085.o
diff --git a/drivers/leds/leds-max8997.c b/drivers/leds/leds-max8997.c
new file mode 100644 (file)
index 0000000..f4c0e37
--- /dev/null
@@ -0,0 +1,372 @@
+/*
+ * leds-max8997.c - LED class driver for MAX8997 LEDs.
+ *
+ * Copyright (C) 2011 Samsung Electronics
+ * Donggeun Kim <dg77.kim@samsung.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/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+#include <linux/platform_device.h>
+
+#define MAX8997_LED_FLASH_SHIFT                        3
+#define MAX8997_LED_FLASH_CUR_MASK             0xf8
+#define MAX8997_LED_MOVIE_SHIFT                        4
+#define MAX8997_LED_MOVIE_CUR_MASK             0xf0
+
+#define MAX8997_LED_FLASH_MAX_BRIGHTNESS       0x1f
+#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS       0xf
+#define MAX8997_LED_NONE_MAX_BRIGHTNESS                0
+
+#define MAX8997_LED0_FLASH_MASK                        0x1
+#define MAX8997_LED0_FLASH_PIN_MASK            0x5
+#define MAX8997_LED0_MOVIE_MASK                        0x8
+#define MAX8997_LED0_MOVIE_PIN_MASK            0x28
+
+#define MAX8997_LED1_FLASH_MASK                        0x2
+#define MAX8997_LED1_FLASH_PIN_MASK            0x6
+#define MAX8997_LED1_MOVIE_MASK                        0x10
+#define MAX8997_LED1_MOVIE_PIN_MASK            0x30
+
+#define MAX8997_LED_BOOST_ENABLE_MASK          (1 << 6)
+
+struct max8997_led {
+       struct max8997_dev *iodev;
+       struct led_classdev cdev;
+       bool enabled;
+       int id;
+       enum max8997_led_mode led_mode;
+       struct mutex mutex;
+};
+
+static void max8997_led_clear_mode(struct max8997_led *led,
+                       enum max8997_led_mode mode)
+{
+       struct i2c_client *client = led->iodev->i2c;
+       u8 val = 0, mask = 0;
+       int ret;
+
+       switch (mode) {
+       case MAX8997_FLASH_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
+               break;
+       case MAX8997_MOVIE_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
+               break;
+       case MAX8997_FLASH_PIN_CONTROL_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
+               break;
+       case MAX8997_MOVIE_PIN_CONTROL_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
+               break;
+       default:
+               break;
+       }
+
+       if (mask) {
+               ret = max8997_update_reg(client,
+                               MAX8997_REG_LEN_CNTL, val, mask);
+               if (ret)
+                       dev_err(led->iodev->dev,
+                               "failed to update register(%d)\n", ret);
+       }
+}
+
+static void max8997_led_set_mode(struct max8997_led *led,
+                       enum max8997_led_mode mode)
+{
+       int ret;
+       struct i2c_client *client = led->iodev->i2c;
+       u8 mask = 0;
+
+       /* First, clear the previous mode */
+       max8997_led_clear_mode(led, led->led_mode);
+
+       switch (mode) {
+       case MAX8997_FLASH_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
+               led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
+               break;
+       case MAX8997_MOVIE_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
+               led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
+               break;
+       case MAX8997_FLASH_PIN_CONTROL_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
+               led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
+               break;
+       case MAX8997_MOVIE_PIN_CONTROL_MODE:
+               mask = led->id ?
+                     MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
+               led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
+               break;
+       default:
+               led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
+               break;
+       }
+
+       if (mask) {
+               ret = max8997_update_reg(client,
+                               MAX8997_REG_LEN_CNTL, mask, mask);
+               if (ret)
+                       dev_err(led->iodev->dev,
+                               "failed to update register(%d)\n", ret);
+       }
+
+       led->led_mode = mode;
+}
+
+static void max8997_led_enable(struct max8997_led *led, bool enable)
+{
+       int ret;
+       struct i2c_client *client = led->iodev->i2c;
+       u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
+
+       if (led->enabled == enable)
+               return;
+
+       val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
+
+       ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
+       if (ret)
+               dev_err(led->iodev->dev,
+                       "failed to update register(%d)\n", ret);
+
+       led->enabled = enable;
+}
+
+static void max8997_led_set_current(struct max8997_led *led,
+                               enum led_brightness value)
+{
+       int ret;
+       struct i2c_client *client = led->iodev->i2c;
+       u8 val = 0, mask = 0, reg = 0;
+
+       switch (led->led_mode) {
+       case MAX8997_FLASH_MODE:
+       case MAX8997_FLASH_PIN_CONTROL_MODE:
+               val = value << MAX8997_LED_FLASH_SHIFT;
+               mask = MAX8997_LED_FLASH_CUR_MASK;
+               reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
+               break;
+       case MAX8997_MOVIE_MODE:
+       case MAX8997_MOVIE_PIN_CONTROL_MODE:
+               val = value << MAX8997_LED_MOVIE_SHIFT;
+               mask = MAX8997_LED_MOVIE_CUR_MASK;
+               reg = MAX8997_REG_MOVIE_CUR;
+               break;
+       default:
+               break;
+       }
+
+       if (mask) {
+               ret = max8997_update_reg(client, reg, val, mask);
+               if (ret)
+                       dev_err(led->iodev->dev,
+                               "failed to update register(%d)\n", ret);
+       }
+}
+
+static void max8997_led_brightness_set(struct led_classdev *led_cdev,
+                               enum led_brightness value)
+{
+       struct max8997_led *led =
+                       container_of(led_cdev, struct max8997_led, cdev);
+
+       if (value) {
+               max8997_led_set_current(led, value);
+               max8997_led_enable(led, true);
+       } else {
+               max8997_led_set_current(led, value);
+               max8997_led_enable(led, false);
+       }
+}
+
+static ssize_t max8997_led_show_mode(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct led_classdev *led_cdev = dev_get_drvdata(dev);
+       struct max8997_led *led =
+                       container_of(led_cdev, struct max8997_led, cdev);
+       ssize_t ret = 0;
+
+       mutex_lock(&led->mutex);
+
+       switch (led->led_mode) {
+       case MAX8997_FLASH_MODE:
+               ret += sprintf(buf, "FLASH\n");
+               break;
+       case MAX8997_MOVIE_MODE:
+               ret += sprintf(buf, "MOVIE\n");
+               break;
+       case MAX8997_FLASH_PIN_CONTROL_MODE:
+               ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
+               break;
+       case MAX8997_MOVIE_PIN_CONTROL_MODE:
+               ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
+               break;
+       default:
+               ret += sprintf(buf, "NONE\n");
+               break;
+       }
+
+       mutex_unlock(&led->mutex);
+
+       return ret;
+}
+
+static ssize_t max8997_led_store_mode(struct device *dev,
+                               struct device_attribute *attr,
+                               const char *buf, size_t size)
+{
+       struct led_classdev *led_cdev = dev_get_drvdata(dev);
+       struct max8997_led *led =
+                       container_of(led_cdev, struct max8997_led, cdev);
+       enum max8997_led_mode mode;
+
+       mutex_lock(&led->mutex);
+
+       if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
+               mode = MAX8997_FLASH_PIN_CONTROL_MODE;
+       else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
+               mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
+       else if (!strncmp(buf, "FLASH", 5))
+               mode = MAX8997_FLASH_MODE;
+       else if (!strncmp(buf, "MOVIE", 5))
+               mode = MAX8997_MOVIE_MODE;
+       else
+               mode = MAX8997_NONE;
+
+       max8997_led_set_mode(led, mode);
+
+       mutex_unlock(&led->mutex);
+
+       return size;
+}
+
+static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
+
+static int __devinit max8997_led_probe(struct platform_device *pdev)
+{
+       struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+       struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+       struct max8997_led *led;
+       char name[20];
+       int ret = 0;
+
+       if (pdata == NULL) {
+               dev_err(&pdev->dev, "no platform data\n");
+               return -ENODEV;
+       }
+
+       led = kzalloc(sizeof(*led), GFP_KERNEL);
+       if (led == NULL) {
+               ret = -ENOMEM;
+               goto err_mem;
+       }
+
+       led->id = pdev->id;
+       snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
+
+       led->cdev.name = name;
+       led->cdev.brightness_set = max8997_led_brightness_set;
+       led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+       led->cdev.brightness = 0;
+       led->iodev = iodev;
+
+       /* initialize mode and brightness according to platform_data */
+       if (pdata->led_pdata) {
+               u8 mode = 0, brightness = 0;
+
+               mode = pdata->led_pdata->mode[led->id];
+               brightness = pdata->led_pdata->brightness[led->id];
+
+               max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
+
+               if (brightness > led->cdev.max_brightness)
+                       brightness = led->cdev.max_brightness;
+               max8997_led_set_current(led, brightness);
+               led->cdev.brightness = brightness;
+       } else {
+               max8997_led_set_mode(led, MAX8997_NONE);
+               max8997_led_set_current(led, 0);
+       }
+
+       mutex_init(&led->mutex);
+
+       platform_set_drvdata(pdev, led);
+
+       ret = led_classdev_register(&pdev->dev, &led->cdev);
+       if (ret < 0)
+               goto err_led;
+
+       ret = device_create_file(led->cdev.dev, &dev_attr_mode);
+       if (ret != 0) {
+               dev_err(&pdev->dev,
+                       "failed to create file: %d\n", ret);
+               goto err_file;
+       }
+
+       return 0;
+
+err_file:
+       led_classdev_unregister(&led->cdev);
+err_led:
+       kfree(led);
+err_mem:
+       return ret;
+}
+
+static int __devexit max8997_led_remove(struct platform_device *pdev)
+{
+       struct max8997_led *led = platform_get_drvdata(pdev);
+
+       device_remove_file(led->cdev.dev, &dev_attr_mode);
+       led_classdev_unregister(&led->cdev);
+       kfree(led);
+
+       return 0;
+}
+
+static struct platform_driver max8997_led_driver = {
+       .driver = {
+               .name  = "max8997-led",
+               .owner = THIS_MODULE,
+       },
+       .probe  = max8997_led_probe,
+       .remove = __devexit_p(max8997_led_remove),
+};
+
+static int __init max8997_led_init(void)
+{
+       return platform_driver_register(&max8997_led_driver);
+}
+module_init(max8997_led_init);
+
+static void __exit max8997_led_exit(void)
+{
+       platform_driver_unregister(&max8997_led_driver);
+}
+module_exit(max8997_led_exit);
+
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
+MODULE_DESCRIPTION("MAX8997 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:max8997-led");