Date:	Fri, 25 May 2012 17:19:11 +0900
From:	Jonghwa Lee <jonghwa3.lee@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Bryan Wu <bryan.wu@...onical.com>,
	Richard Purdie <rpudie@...ys.net>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH] leds: MAX77693: Add MAX77694 LED driver

This patch is initial support for max77693 led driver.
MAX77693 has 2 FLEDS, and 2 modes, FLASH/TORCH. It can be set up brightness,
opeation, flash timer by platform data, and especially brightness can be modified
by led API either. This driver uses regmap to access to its register.

Signed-off-by: Jonghwa LEE <jonghwa3.lee@...sung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/leds/Kconfig          |    8 +
 drivers/leds/Makefile         |    1 +
 drivers/leds/leds-max77693.c  |  301 +++++++++++++++++++++++++++++++++++++++++
 include/linux/leds-max77693.h |  154 +++++++++++++++++++++
 4 files changed, 464 insertions(+), 0 deletions(-)
 create mode 100644 drivers/leds/leds-max77693.c
 create mode 100644 include/linux/leds-max77693.h

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index ff4b8cf..6a644df 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -387,6 +387,14 @@ config LEDS_TCA6507
 	  LED driver chips accessed via the I2C bus.
 	  Driver support brightness control and hardware-assisted blinking.
 
+config LEDS_MAX77693
+	bool "LED support for the MAX77693"
+	depends on LEDS_CLASS
+	depends on MFD_MAX77693
+	default y
+	help
+	  This option enables support for the LEDs on the MAX77693.
+
 config LEDS_MAX8997
 	tristate "LED support for MAX8997 PMIC"
 	depends on LEDS_CLASS && MFD_MAX8997
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 890481c..ff4ff2c 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -45,6 +45,7 @@ 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
+obj-$(CONFIG_LEDS_MAX77693)		+= leds-max77693.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o
diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c
new file mode 100644
index 0000000..dee8f59
--- /dev/null
+++ b/drivers/leds/leds-max77693.c
@@ -0,0 +1,301 @@
+/*
+ * LED driver for Maxim MAX77693 - leds-max77673.c
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * ByungChang Cha <bc.cha@...sung.com>
+ * Jonghwa Lee <jonghwa3.lee@...sung.com>
+ *
+ * This program is not provided / owned by Maxim Integrated Products.
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+#include <linux/leds-max77693.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+struct max77693_led_data {
+	struct led_classdev led;
+	struct max77693_dev *max77693;
+	struct max77693_led *data;
+	struct regmap *regmap;
+	struct work_struct work;
+	struct mutex lock;
+	spinlock_t value_lock;
+	int brightness;
+};
+
+static u8 led_en_mask[MAX77693_LED_MAX] = {
+	MAX77693_FLASH_FLED1_EN,
+	MAX77693_FLASH_FLED2_EN,
+	MAX77693_TORCH_FLED1_EN,
+	MAX77693_TORCH_FLED2_EN
+};
+
+static u8 reg_led_timer[MAX77693_LED_MAX] = {
+	MAX77693_LED_REG_FLASH_TIMER,
+	MAX77693_LED_REG_FLASH_TIMER,
+	MAX77693_LED_REG_ITORCHTIMER,
+	MAX77693_LED_REG_ITORCHTIMER,
+};
+
+static u8 reg_led_current[MAX77693_LED_MAX] = {
+	MAX77693_LED_REG_IFLASH1,
+	MAX77693_LED_REG_IFLASH2,
+	MAX77693_LED_REG_ITORCH,
+	MAX77693_LED_REG_ITORCH,
+};
+
+static u8 led_current_mask[MAX77693_LED_MAX] = {
+	MAX77693_FLASH_IOUT1,
+	MAX77693_FLASH_IOUT2,
+	MAX77693_TORCH_IOUT1,
+	MAX77693_TORCH_IOUT2
+};
+
+static u8 led_current_shift[MAX77693_LED_MAX] = {
+	0,
+	0,
+	0,
+	4,
+};
+
+static int max77693_led_get_en_value(struct max77693_led_data *led_data, int on)
+{
+	if (on)
+		return MAX77693_FLED_I2C;
+
+	if (led_data->data->cntrl_mode == MAX77693_LED_CTRL_BY_I2C)
+		return MAX77693_FLED_OFF;
+	else if (led_data->data->id < 2)
+		return MAX77693_FLED_FLASHEN;
+	else
+		return MAX77693_FLED_TORCHEN;
+}
+
+static void max77693_led_set(struct led_classdev *led_cdev,
+					 enum led_brightness value)
+{
+	unsigned long flags;
+	struct max77693_led_data *led_data
+		= container_of(led_cdev, struct max77693_led_data, led);
+
+	pr_debug("[LED] %s\n", __func__);
+
+	spin_lock_irqsave(&led_data->value_lock, flags);
+	led_data->brightness = min_t(int, value, MAX77693_FLASH_IOUT1);
+	spin_unlock_irqrestore(&led_data->value_lock, flags);
+
+	schedule_work(&led_data->work);
+}
+
+static void led_set(struct max77693_led_data *led_data)
+{
+	int ret;
+	struct max77693_led *data = led_data->data;
+	int id = data->id;
+	u8 mask;
+	u8 shift = led_current_shift[id];
+	int value;
+
+		value = max77693_led_get_en_value(led_data, 0);
+		mask = led_en_mask[id];
+		ret = regmap_update_bits(led_data->regmap,
+					MAX77693_LED_REG_FLASH_EN,
+					led_en_mask[id],
+					value << (ffs(led_en_mask[id]) - 1));
+		if (unlikely(ret))
+			goto error_set_bits;
+
+		ret = regmap_update_bits(led_data->regmap,
+					reg_led_current[id],
+					led_current_mask[id],
+					led_data->brightness << shift);
+		if (unlikely(ret))
+			goto error_set_bits;
+
+		return;
+
+error_set_bits:
+	pr_err("%s: can't set led level %d\n", __func__, ret);
+	return;
+}
+
+static void max77693_led_work(struct work_struct *work)
+{
+	struct max77693_led_data *led_data
+		= container_of(work, struct max77693_led_data, work);
+
+	pr_debug("[LED] %s\n", __func__);
+
+	mutex_lock(&led_data->lock);
+	led_set(led_data);
+	mutex_unlock(&led_data->lock);
+}
+
+static int max77693_led_setup(struct max77693_led_data *led_data)
+{
+	int ret = 0;
+	struct max77693_led *data = led_data->data;
+	int id = data->id;
+	int value;
+
+	ret |= regmap_write(led_data->regmap, MAX77693_LED_REG_VOUT_CNTL,
+				  MAX77693_BOOST_FLASH_FLEDNUM_2
+				| MAX77693_BOOST_FLASH_MODE_BOTH);
+	ret |= regmap_write(led_data->regmap, MAX77693_LED_REG_VOUT_FLASH1,
+			  MAX77693_BOOST_VOUT_FLASH_FROM_VOLT(5000));
+	ret |= regmap_write(led_data->regmap,
+			MAX77693_LED_REG_MAX_FLASH1, 0xEC);
+	ret |= regmap_write(led_data->regmap,
+			MAX77693_LED_REG_MAX_FLASH2, 0x00);
+
+	value = max77693_led_get_en_value(led_data, 0);
+
+	ret |= regmap_update_bits(led_data->regmap,
+				 MAX77693_LED_REG_FLASH_EN,
+				 led_en_mask[id],
+				 value << (ffs(led_en_mask[id]) - 1));
+
+	/* Set TORCH_TMR_DUR or FLASH_TMR_DUR */
+	if (id < 2) {
+		ret |= regmap_write(led_data->regmap, reg_led_timer[id],
+				(data->timer | data->timer_mode << 7));
+	} else {
+		ret |= regmap_write(led_data->regmap, reg_led_timer[id],
+					0xC0);
+	}
+
+	/* Set current */
+	ret |= regmap_update_bits(led_data->regmap, reg_led_current[id],
+			led_current_mask[id],
+			led_data->brightness << led_current_shift[id]);
+
+	return ret;
+}
+
+static int max77693_led_probe(struct platform_device *pdev)
+{
+	struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
+	struct max77693_platform_data *max77693_pdata
+					= dev_get_platdata(max77693->dev);
+	struct max77693_led_platform_data *pdata;
+	struct max77693_led *data;
+	struct max77693_led_data *led_data;
+	struct max77693_led_data **led_datas;
+	int ret = 0;
+	int i;
+
+	if (max77693_pdata->led_data) {
+		pdata = max77693_pdata->led_data;
+	} else {
+		pr_err("%s : No plaform data\n", __func__);
+		return -ENODEV;
+	}
+
+	led_datas = devm_kzalloc(max77693->dev,
+				sizeof(struct max77693_led_data *)
+				* MAX77693_LED_MAX, GFP_KERNEL);
+	if (unlikely(!led_datas)) {
+		pr_err("[LED] memory allocation error %s\n", __func__);
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, led_datas);
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		data = &(pdata->leds[i]);
+		led_data = devm_kzalloc(max77693->dev,
+				sizeof(struct max77693_led_data),
+				GFP_KERNEL);
+		led_datas[i] = led_data;
+		if (unlikely(!led_data)) {
+			pr_err("[LED] memory allocation error %s\n", __func__);
+			ret = -ENOMEM;
+			continue;
+		}
+
+		led_data->max77693 = max77693;
+		led_data->regmap = max77693->regmap;
+		led_data->data = data;
+		led_data->led.name = data->name;
+		led_data->led.brightness_set = max77693_led_set;
+		led_data->led.brightness = LED_OFF;
+		led_data->brightness = data->brightness;
+		led_data->led.flags = LED_CORE_SUSPENDRESUME;
+		led_data->led.max_brightness = data->id < 2
+			? MAX_FLASH_DRV_LEVEL : MAX_TORCH_DRV_LEVEL;
+
+		mutex_init(&led_data->lock);
+		spin_lock_init(&led_data->value_lock);
+		INIT_WORK(&led_data->work, max77693_led_work);
+
+		ret = led_classdev_register(&pdev->dev, &led_data->led);
+		if (unlikely(ret)) {
+			pr_err("unable to register LED\n");
+			ret = -EFAULT;
+			continue;
+		}
+
+		ret = max77693_led_setup(led_data);
+		if (unlikely(ret)) {
+			pr_err("unable to register LED\n");
+			led_classdev_unregister(&led_data->led);
+			ret = -EFAULT;
+		}
+	}
+	return ret;
+}
+
+static int __devexit max77693_led_remove(struct platform_device *pdev)
+{
+	struct max77693_led_data **led_datas = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i != MAX77693_LED_MAX; ++i) {
+		if (led_datas[i] == NULL)
+			continue;
+
+		cancel_work_sync(&led_datas[i]->work);
+		mutex_destroy(&led_datas[i]->lock);
+		led_classdev_unregister(&led_datas[i]->led);
+	}
+
+	return 0;
+}
+
+static struct platform_driver max77693_led_driver = {
+	.probe		= max77693_led_probe,
+	.remove		= __devexit_p(max77693_led_remove),
+	.driver		= {
+		.name	= "max77693-led",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init max77693_led_init(void)
+{
+	return platform_driver_register(&max77693_led_driver);
+}
+module_init(max77693_led_init);
+
+static void __exit max77693_led_exit(void)
+{
+	platform_driver_unregister(&max77693_led_driver);
+}
+module_exit(max77693_led_exit);
+
+MODULE_AUTHOR("ByungChang Cha <bc.cha@...sung.com>");
+MODULE_DESCRIPTION("MAX77693 LED driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/leds-max77693.h b/include/linux/leds-max77693.h
new file mode 100644
index 0000000..a50a120
--- /dev/null
+++ b/include/linux/leds-max77693.h
@@ -0,0 +1,154 @@
+/*
+ * leds-max77693.h - Flash-led driver for Maxim MAX77693
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * ByungChang Cha <bc.cha@...sung.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.
+ */
+
+#ifndef __LEDS_MAX77693_H__
+#define __LEDS_MAX77693_H__
+
+/* MAX77693_IFLASH1 */
+#define MAX77693_FLASH_IOUT1		0x3F
+
+/* MAX77693_IFLASH2 */
+#define MAX77693_FLASH_IOUT2		0x3F
+
+/* MAX77693_ITORCH */
+#define MAX77693_TORCH_IOUT1		0x0F
+#define MAX77693_TORCH_IOUT2		0xF0
+
+/* MAX77693_TORCH_TIMER */
+#define MAX77693_TORCH_TMR_DUR		0x0F
+#define MAX77693_DIS_TORCH_TMR		0x40
+#define MAX77693_TORCH_TMR_MODE		0x80
+#define MAX77693_TORCH_TMR_MODE_ONESHOT	0x00
+#define MAX77693_TORCH_TMR_MDOE_MAXTIMER	0x01
+
+/* MAX77693_FLASH_TIMER */
+#define MAX77693_FLASH_TMR_DUR		0x0F
+#define MAX77693_FLASH_TMR_MODE		0x80
+/* MAX77693_FLASH_TMR_MODE value */
+#define MAX77693_FLASH_TMR_MODE_ONESHOT	0x00
+#define MAX77693_FLASH_TMR_MDOE_MAXTIMER	0x01
+
+/* MAX77693_FLASH_EN */
+#define MAX77693_TORCH_FLED2_EN		0x03
+#define MAX77693_TORCH_FLED1_EN		0x0C
+#define MAX77693_FLASH_FLED2_EN		0x30
+#define MAX77693_FLASH_FLED1_EN		0xC0
+/* MAX77693 FLEDx_EN value */
+#define MAX77693_FLED_OFF		0x00
+#define MAX77693_FLED_FLASHEN		0x01
+#define MAX77693_FLED_TORCHEN		0x02
+#define MAX77693_FLED_I2C		0X03
+
+/* MAX77693_VOUT_CNTL */
+#define MAX77693_BOOST_FLASH_MODE	0x07
+#define MAX77693_BOOST_FLASH_FLEDNUM	0x80
+/* MAX77693_BOOST_FLASH_MODE vaule*/
+#define MAX77693_BOOST_FLASH_MODE_OFF	0x00
+#define MAX77693_BOOST_FLASH_MODE_FLED1	0x01
+#define MAX77693_BOOST_FLASH_MODE_FLED2	0x02
+#define MAX77693_BOOST_FLASH_MODE_BOTH	0x03
+#define MAX77693_BOOST_FLASH_MODE_FIXED	0x04
+/* MAX77693_BOOST_FLASH_FLEDNUM vaule*/
+#define MAX77693_BOOST_FLASH_FLEDNUM_1	0x00
+#define MAX77693_BOOST_FLASH_FLEDNUM_2	0x80
+
+/* MAX77693_VOUT_FLASH1 */
+#define MAX77693_BOOST_VOUT_FLASH	0x7F
+#define MAX77693_BOOST_VOUT_FLASH_FROM_VOLT(mV)				\
+		((mV) <= 3300 ? 0x00 :					\
+		((mV) <= 5500 ? (((mV) - 3300) / 25 + 0x0C) : 0x7F))
+
+#define MAX_FLASH_CURRENT	1000	/* 1000mA(0x1f) */
+#define MAX_TORCH_CURRENT	250	/* 250mA(0x0f) */
+#define MAX_FLASH_DRV_LEVEL	63	/* 15.625 + 15.625*63 mA */
+#define MAX_TORCH_DRV_LEVEL	15	/* 15.625 + 15.625*15 mA */
+
+enum max77693_led_id
+{
+	MAX77693_FLASH_LED_1,
+	MAX77693_FLASH_LED_2,
+	MAX77693_TORCH_LED_1,
+	MAX77693_TORCH_LED_2,
+	MAX77693_LED_MAX,
+};
+
+enum max77693_led_time
+{
+	MAX77693_FLASH_TIME_62P5MS,
+	MAX77693_FLASH_TIME_125MS,
+	MAX77693_FLASH_TIME_187P5MS,
+	MAX77693_FLASH_TIME_250MS,
+	MAX77693_FLASH_TIME_312P5MS,
+	MAX77693_FLASH_TIME_375MS,
+	MAX77693_FLASH_TIME_437P5MS,
+	MAX77693_FLASH_TIME_500MS,
+	MAX77693_FLASH_TIME_562P5MS,
+	MAX77693_FLASH_TIME_625MS,
+	MAX77693_FLASH_TIME_687P5MS,
+	MAX77693_FLASH_TIME_750MS,
+	MAX77693_FLASH_TIME_812P5MS,
+	MAX77693_FLASH_TIME_875MS,
+	MAX77693_FLASH_TIME_937P5MS,
+	MAX77693_FLASH_TIME_1000MS,
+	MAX77693_FLASH_TIME_MAX,
+};
+
+enum max77693_torch_time
+{
+	MAX77693_TORCH_TIME_262MS,
+	MAX77693_TORCH_TIME_524MS,
+	MAX77693_TORCH_TIME_786MS,
+	MAX77693_TORCH_TIME_1048MS,
+	MAX77693_TORCH_TIME_1572MS,
+	MAX77693_TORCH_TIME_2096MS,
+	MAX77693_TORCH_TIME_2620MS,
+	MAX77693_TORCH_TIME_3114MS,
+	MAX77693_TORCH_TIME_4193MS,
+	MAX77693_TORCH_TIME_5242MS,
+	MAX77693_TORCH_TIME_6291MS,
+	MAX77693_TORCH_TIME_7340MS,
+	MAX77693_TORCH_TIME_9437MS,
+	MAX77693_TORCH_TIME_11534MS,
+	MAX77693_TORCH_TIME_13631MS,
+	MAX77693_TORCH_TIME_15728MS,
+	MAX77693_TORCH_TIME_MAX,
+};
+
+enum max77693_timer_mode
+{
+	MAX77693_TIMER_MODE_ONE_SHOT,
+	MAX77693_TIMER_MODE_MAX_TIMER,
+};
+
+enum max77693_led_cntrl_mode
+{
+	MAX77693_LED_CTRL_BY_FLASHSTB,
+	MAX77693_LED_CTRL_BY_I2C,
+};
+
+struct max77693_led
+{
+	const char			*name;
+	const char			*default_trigger;
+	int				id;
+	int				timer;
+	int				brightness;
+	enum max77693_timer_mode	timer_mode;
+	enum max77693_led_cntrl_mode	cntrl_mode;
+};
+
+struct max77693_led_platform_data
+{
+	int num_leds;
+	struct max77693_led leds[MAX77693_LED_MAX];
+};
+
+#endif
-- 
1.7.4.1

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