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leds: Add suuport for MAX8997-LED driver
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>
This commit is contained in:
Donggeun Kim
Samuel Ortiz
parent
f6dd2db940
commit
8584cb82f1
@ -387,6 +387,13 @@ config LEDS_RENESAS_TPU
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pin function. The latter to support brightness control.
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Brightness control is supported but hardware blinking is not.
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config LEDS_MAX8997
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tristate "LED support for MAX8997 PMIC"
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depends on LEDS_CLASS && MFD_MAX8997
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help
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This option enables support for on-chip LED drivers on
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MAXIM MAX8997 PMIC.
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config LEDS_TRIGGERS
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bool "LED Trigger support"
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depends on LEDS_CLASS
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@ -43,6 +43,7 @@ obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
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obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
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obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
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obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o
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obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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372
drivers/leds/leds-max8997.c
Normal file
372
drivers/leds/leds-max8997.c
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@ -0,0 +1,372 @@
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/*
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* leds-max8997.c - LED class driver for MAX8997 LEDs.
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*
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* Copyright (C) 2011 Samsung Electronics
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* Donggeun Kim <dg77.kim@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/leds.h>
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#include <linux/mfd/max8997.h>
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#include <linux/mfd/max8997-private.h>
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#include <linux/platform_device.h>
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#define MAX8997_LED_FLASH_SHIFT 3
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#define MAX8997_LED_FLASH_CUR_MASK 0xf8
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#define MAX8997_LED_MOVIE_SHIFT 4
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#define MAX8997_LED_MOVIE_CUR_MASK 0xf0
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#define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
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#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
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#define MAX8997_LED_NONE_MAX_BRIGHTNESS 0
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#define MAX8997_LED0_FLASH_MASK 0x1
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#define MAX8997_LED0_FLASH_PIN_MASK 0x5
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#define MAX8997_LED0_MOVIE_MASK 0x8
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#define MAX8997_LED0_MOVIE_PIN_MASK 0x28
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#define MAX8997_LED1_FLASH_MASK 0x2
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#define MAX8997_LED1_FLASH_PIN_MASK 0x6
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#define MAX8997_LED1_MOVIE_MASK 0x10
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#define MAX8997_LED1_MOVIE_PIN_MASK 0x30
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#define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)
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struct max8997_led {
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struct max8997_dev *iodev;
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struct led_classdev cdev;
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bool enabled;
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int id;
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enum max8997_led_mode led_mode;
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struct mutex mutex;
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};
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static void max8997_led_clear_mode(struct max8997_led *led,
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enum max8997_led_mode mode)
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{
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struct i2c_client *client = led->iodev->i2c;
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u8 val = 0, mask = 0;
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int ret;
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switch (mode) {
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case MAX8997_FLASH_MODE:
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mask = led->id ?
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MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
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break;
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case MAX8997_MOVIE_MODE:
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mask = led->id ?
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MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
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break;
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case MAX8997_FLASH_PIN_CONTROL_MODE:
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mask = led->id ?
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MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
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break;
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case MAX8997_MOVIE_PIN_CONTROL_MODE:
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mask = led->id ?
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MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
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break;
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default:
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break;
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}
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if (mask) {
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ret = max8997_update_reg(client,
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MAX8997_REG_LEN_CNTL, val, mask);
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if (ret)
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dev_err(led->iodev->dev,
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"failed to update register(%d)\n", ret);
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}
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}
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static void max8997_led_set_mode(struct max8997_led *led,
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enum max8997_led_mode mode)
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{
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int ret;
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struct i2c_client *client = led->iodev->i2c;
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u8 mask = 0;
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/* First, clear the previous mode */
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max8997_led_clear_mode(led, led->led_mode);
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switch (mode) {
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case MAX8997_FLASH_MODE:
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mask = led->id ?
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MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
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led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
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break;
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case MAX8997_MOVIE_MODE:
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mask = led->id ?
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MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
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led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
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break;
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case MAX8997_FLASH_PIN_CONTROL_MODE:
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mask = led->id ?
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MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
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led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
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break;
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case MAX8997_MOVIE_PIN_CONTROL_MODE:
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mask = led->id ?
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MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
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led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
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break;
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default:
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led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
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break;
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}
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if (mask) {
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ret = max8997_update_reg(client,
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MAX8997_REG_LEN_CNTL, mask, mask);
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if (ret)
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dev_err(led->iodev->dev,
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"failed to update register(%d)\n", ret);
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}
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led->led_mode = mode;
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}
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static void max8997_led_enable(struct max8997_led *led, bool enable)
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{
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int ret;
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struct i2c_client *client = led->iodev->i2c;
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u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
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if (led->enabled == enable)
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return;
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val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
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ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
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if (ret)
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dev_err(led->iodev->dev,
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"failed to update register(%d)\n", ret);
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led->enabled = enable;
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}
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static void max8997_led_set_current(struct max8997_led *led,
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enum led_brightness value)
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{
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int ret;
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struct i2c_client *client = led->iodev->i2c;
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u8 val = 0, mask = 0, reg = 0;
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switch (led->led_mode) {
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case MAX8997_FLASH_MODE:
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case MAX8997_FLASH_PIN_CONTROL_MODE:
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val = value << MAX8997_LED_FLASH_SHIFT;
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mask = MAX8997_LED_FLASH_CUR_MASK;
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reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
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break;
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case MAX8997_MOVIE_MODE:
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case MAX8997_MOVIE_PIN_CONTROL_MODE:
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val = value << MAX8997_LED_MOVIE_SHIFT;
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mask = MAX8997_LED_MOVIE_CUR_MASK;
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reg = MAX8997_REG_MOVIE_CUR;
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break;
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default:
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break;
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}
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if (mask) {
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ret = max8997_update_reg(client, reg, val, mask);
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if (ret)
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dev_err(led->iodev->dev,
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"failed to update register(%d)\n", ret);
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}
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}
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static void max8997_led_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct max8997_led *led =
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container_of(led_cdev, struct max8997_led, cdev);
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if (value) {
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max8997_led_set_current(led, value);
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max8997_led_enable(led, true);
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} else {
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max8997_led_set_current(led, value);
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max8997_led_enable(led, false);
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}
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}
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static ssize_t max8997_led_show_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct max8997_led *led =
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container_of(led_cdev, struct max8997_led, cdev);
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ssize_t ret = 0;
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mutex_lock(&led->mutex);
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switch (led->led_mode) {
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case MAX8997_FLASH_MODE:
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ret += sprintf(buf, "FLASH\n");
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break;
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case MAX8997_MOVIE_MODE:
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ret += sprintf(buf, "MOVIE\n");
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break;
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case MAX8997_FLASH_PIN_CONTROL_MODE:
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ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
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break;
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case MAX8997_MOVIE_PIN_CONTROL_MODE:
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ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
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break;
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default:
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ret += sprintf(buf, "NONE\n");
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break;
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}
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mutex_unlock(&led->mutex);
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return ret;
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}
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static ssize_t max8997_led_store_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct max8997_led *led =
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container_of(led_cdev, struct max8997_led, cdev);
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enum max8997_led_mode mode;
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mutex_lock(&led->mutex);
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if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
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mode = MAX8997_FLASH_PIN_CONTROL_MODE;
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else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
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mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
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else if (!strncmp(buf, "FLASH", 5))
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mode = MAX8997_FLASH_MODE;
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else if (!strncmp(buf, "MOVIE", 5))
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mode = MAX8997_MOVIE_MODE;
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else
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mode = MAX8997_NONE;
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max8997_led_set_mode(led, mode);
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mutex_unlock(&led->mutex);
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return size;
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}
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static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
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static int __devinit max8997_led_probe(struct platform_device *pdev)
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{
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struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
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struct max8997_led *led;
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char name[20];
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int ret = 0;
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if (pdata == NULL) {
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dev_err(&pdev->dev, "no platform data\n");
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return -ENODEV;
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}
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led = kzalloc(sizeof(*led), GFP_KERNEL);
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if (led == NULL) {
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ret = -ENOMEM;
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goto err_mem;
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}
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led->id = pdev->id;
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snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
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led->cdev.name = name;
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led->cdev.brightness_set = max8997_led_brightness_set;
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led->cdev.flags |= LED_CORE_SUSPENDRESUME;
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led->cdev.brightness = 0;
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led->iodev = iodev;
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/* initialize mode and brightness according to platform_data */
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if (pdata->led_pdata) {
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u8 mode = 0, brightness = 0;
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mode = pdata->led_pdata->mode[led->id];
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brightness = pdata->led_pdata->brightness[led->id];
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max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
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if (brightness > led->cdev.max_brightness)
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brightness = led->cdev.max_brightness;
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max8997_led_set_current(led, brightness);
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led->cdev.brightness = brightness;
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} else {
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max8997_led_set_mode(led, MAX8997_NONE);
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max8997_led_set_current(led, 0);
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}
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mutex_init(&led->mutex);
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platform_set_drvdata(pdev, led);
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ret = led_classdev_register(&pdev->dev, &led->cdev);
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if (ret < 0)
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goto err_led;
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ret = device_create_file(led->cdev.dev, &dev_attr_mode);
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if (ret != 0) {
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dev_err(&pdev->dev,
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"failed to create file: %d\n", ret);
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goto err_file;
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}
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return 0;
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err_file:
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led_classdev_unregister(&led->cdev);
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err_led:
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kfree(led);
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err_mem:
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return ret;
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}
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static int __devexit max8997_led_remove(struct platform_device *pdev)
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{
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struct max8997_led *led = platform_get_drvdata(pdev);
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device_remove_file(led->cdev.dev, &dev_attr_mode);
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led_classdev_unregister(&led->cdev);
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kfree(led);
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return 0;
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}
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static struct platform_driver max8997_led_driver = {
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.driver = {
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.name = "max8997-led",
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.owner = THIS_MODULE,
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},
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.probe = max8997_led_probe,
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.remove = __devexit_p(max8997_led_remove),
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};
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static int __init max8997_led_init(void)
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{
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return platform_driver_register(&max8997_led_driver);
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}
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module_init(max8997_led_init);
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static void __exit max8997_led_exit(void)
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{
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platform_driver_unregister(&max8997_led_driver);
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}
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module_exit(max8997_led_exit);
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MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
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MODULE_DESCRIPTION("MAX8997 LED driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:max8997-led");
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