led: Enable led in 88pm860x

Enable led sub device in Marvell 88PM860x. Two LED arrays can be supported.
Each LED array can be used for R,G,B leds.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/leds/Kconfig

@@ -17,6 +17,13 @@ config LEDS_CLASS
 
 comment "LED drivers"
 
+config LEDS_88PM860X
+	tristate "LED Support for Marvell 88PM860x PMIC"
+	depends on LEDS_CLASS && MFD_88PM860X
+	help
+	  This option enables support for on-chip LED drivers found on Marvell
+	  Semiconductor 88PM8606 PMIC.
+
 config LEDS_ATMEL_PWM
 	tristate "LED Support using Atmel PWM outputs"
 	depends on LEDS_CLASS && ATMEL_PWM

drivers/leds/Makefile

@@ -5,6 +5,7 @@ obj-$(CONFIG_LEDS_CLASS)		+= led-class.o
 obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o
 
 # LED Platform Drivers
+obj-$(CONFIG_LEDS_88PM860X)		+= leds-88pm860x.o
 obj-$(CONFIG_LEDS_ATMEL_PWM)		+= leds-atmel-pwm.o
 obj-$(CONFIG_LEDS_BD2802)		+= leds-bd2802.o
 obj-$(CONFIG_LEDS_LOCOMO)		+= leds-locomo.o

drivers/leds/leds-88pm860x.c

+/*
+ * LED driver for Marvell 88PM860x
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ *	Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/88pm860x.h>
+
+#define LED_PWM_SHIFT		(3)
+#define LED_PWM_MASK		(0x1F)
+#define LED_CURRENT_MASK	(0x07 << 5)
+
+#define LED_BLINK_ON_MASK	(0x07)
+#define LED_BLINK_PERIOD_MASK	(0x0F << 3)
+#define LED_BLINK_MASK		(0x7F)
+
+#define LED_BLINK_ON(x)		((x & 0x7) * 66 + 66)
+#define LED_BLINK_PERIOD(x)	((x & 0xF) * 530 + 930)
+#define LED_BLINK_ON_MIN	LED_BLINK_ON(0)
+#define LED_BLINK_ON_MAX	LED_BLINK_ON(0x7)
+#define LED_BLINK_PERIOD_MIN	LED_BLINK_PERIOD(0)
+#define LED_BLINK_PERIOD_MAX	LED_BLINK_PERIOD(0xE)
+#define LED_TO_ON(x)		((x - 66) / 66)
+#define LED_TO_PERIOD(x)	((x - 930) / 530)
+
+#define LED1_BLINK_EN		(1 << 1)
+#define LED2_BLINK_EN		(1 << 2)
+
+enum {
+	SET_BRIGHTNESS,
+	SET_BLINK,
+};
+
+struct pm860x_led {
+	struct led_classdev cdev;
+	struct i2c_client *i2c;
+	struct work_struct work;
+	struct pm860x_chip *chip;
+	struct mutex lock;
+	char name[MFD_NAME_SIZE];
+
+	int port;
+	int iset;
+	int command;
+	int offset;
+	unsigned char brightness;
+	unsigned char current_brightness;
+
+	int blink_data;
+	int blink_time;
+	int blink_on;
+	int blink_off;
+};
+
+/* return offset of color register */
+static inline int __led_off(int port)
+{
+	int ret = -EINVAL;
+
+	switch (port) {
+	case PM8606_LED1_RED:
+	case PM8606_LED1_GREEN:
+	case PM8606_LED1_BLUE:
+		ret = port - PM8606_LED1_RED + PM8606_RGB1B;
+		break;
+	case PM8606_LED2_RED:
+	case PM8606_LED2_GREEN:
+	case PM8606_LED2_BLUE:
+		ret = port - PM8606_LED2_RED + PM8606_RGB2B;
+		break;
+	}
+	return ret;
+}
+
+/* return offset of blink register */
+static inline int __blink_off(int port)
+{
+	int ret = -EINVAL;
+
+	switch (port) {
+	case PM8606_LED1_RED:
+	case PM8606_LED1_GREEN:
+	case PM8606_LED1_BLUE:
+		ret = PM8606_RGB1A;
+	case PM8606_LED2_RED:
+	case PM8606_LED2_GREEN:
+	case PM8606_LED2_BLUE:
+		ret = PM8606_RGB2A;
+	}
+	return ret;
+}
+
+static inline int __blink_ctl_mask(int port)
+{
+	int ret = -EINVAL;
+
+	switch (port) {
+	case PM8606_LED1_RED:
+	case PM8606_LED1_GREEN:
+	case PM8606_LED1_BLUE:
+		ret = LED1_BLINK_EN;
+		break;
+	case PM8606_LED2_RED:
+	case PM8606_LED2_GREEN:
+	case PM8606_LED2_BLUE:
+		ret = LED2_BLINK_EN;
+		break;
+	}
+	return ret;
+}
+
+static int __led_set(struct pm860x_led *led, int command)
+{
+	struct pm860x_chip *chip = led->chip;
+	int mask, ret;
+
+	mutex_lock(&led->lock);
+	switch (command) {
+	case SET_BRIGHTNESS:
+		if ((led->current_brightness == 0) && led->brightness) {
+			if (led->iset) {
+				ret = pm860x_set_bits(led->i2c, led->offset,
+						LED_CURRENT_MASK, led->iset);
+				if (ret < 0)
+					goto out;
+			}
+		} else if (led->brightness == 0) {
+			ret = pm860x_set_bits(led->i2c, led->offset,
+						LED_CURRENT_MASK, 0);
+			if (ret < 0)
+				goto out;
+		}
+		ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
+					led->brightness);
+		if (ret < 0)
+			goto out;
+		led->current_brightness = led->brightness;
+		dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
+			led->offset, led->brightness);
+		break;
+	case SET_BLINK:
+		ret = pm860x_set_bits(led->i2c, led->offset,
+				LED_BLINK_MASK, led->blink_data);
+		if (ret < 0)
+			goto out;
+
+		mask = __blink_ctl_mask(led->port);
+		ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
+		if (ret < 0)
+			goto out;
+		dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
+			led->blink_on, led->blink_off);
+		break;
+	}
+out:
+	mutex_unlock(&led->lock);
+	return 0;
+}
+
+static void pm860x_led_work(struct work_struct *work)
+{
+	struct pm860x_led *led;
+
+	led = container_of(work, struct pm860x_led, work);
+	__led_set(led, led->command);
+}
+
+static void pm860x_led_set(struct led_classdev *cdev,
+			   enum led_brightness value)
+{
+	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+
+	data->offset = __led_off(data->port);
+	data->brightness = value >> 3;
+	data->command = SET_BRIGHTNESS;
+	schedule_work(&data->work);
+}
+
+static int pm860x_led_blink(struct led_classdev *cdev,
+			    unsigned long *delay_on,
+			    unsigned long *delay_off)
+{
+	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+	int period, on;
+
+	on = *delay_on;
+	if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX))
+		return -EINVAL;
+
+	on = LED_TO_ON(on);
+	on = LED_BLINK_ON(on);
+
+	period = on + *delay_off;
+	if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX))
+		return -EINVAL;
+	period = LED_TO_PERIOD(period);
+	period = LED_BLINK_PERIOD(period);
+
+	data->offset = __blink_off(data->port);
+	data->blink_on = on;
+	data->blink_off = period - data->blink_on;
+	data->blink_data = (period << 3) | data->blink_on;
+	data->command = SET_BLINK;
+	schedule_work(&data->work);
+
+	return 0;
+}
+
+static int __check_device(struct pm860x_led_pdata *pdata, char *name)
+{
+	struct pm860x_led_pdata *p = pdata;
+	int ret = -EINVAL;
+
+	while (p && p->id) {
+		if ((p->id != PM8606_ID_LED) || (p->flags < 0))
+			break;
+
+		if (!strncmp(name, pm860x_led_name[p->flags],
+			MFD_NAME_SIZE)) {
+			ret = (int)p->flags;
+			break;
+		}
+		p++;
+	}
+	return ret;
+}
+
+static int pm860x_led_probe(struct platform_device *pdev)
+{
+	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+	struct pm860x_platform_data *pm860x_pdata;
+	struct pm860x_led_pdata *pdata;
+	struct pm860x_led *data;
+	struct resource *res;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "No I/O resource!\n");
+		return -EINVAL;
+	}
+
+	if (pdev->dev.parent->platform_data) {
+		pm860x_pdata = pdev->dev.parent->platform_data;
+		pdata = pm860x_pdata->led;
+	} else
+		pdata = NULL;
+
+	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+	strncpy(data->name, res->name, MFD_NAME_SIZE);
+	dev_set_drvdata(&pdev->dev, data);
+	data->chip = chip;
+	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
+	data->iset = pdata->iset;
+	data->port = __check_device(pdata, data->name);
+	if (data->port < 0)
+		return -EINVAL;
+
+	data->current_brightness = 0;
+	data->cdev.name = data->name;
+	data->cdev.brightness_set = pm860x_led_set;
+	data->cdev.blink_set = pm860x_led_blink;
+	mutex_init(&data->lock);
+	INIT_WORK(&data->work, pm860x_led_work);
+
+	ret = led_classdev_register(chip->dev, &data->cdev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
+		goto out;
+	}
+	return 0;
+out:
+	kfree(data);
+	return ret;
+}
+
+static int pm860x_led_remove(struct platform_device *pdev)
+{
+	struct pm860x_led *data = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&data->cdev);
+	kfree(data);
+
+	return 0;
+}
+
+static struct platform_driver pm860x_led_driver = {
+	.driver	= {
+		.name	= "88pm860x-led",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= pm860x_led_probe,
+	.remove	= pm860x_led_remove,
+};
+
+static int __devinit pm860x_led_init(void)
+{
+	return platform_driver_register(&pm860x_led_driver);
+}
+module_init(pm860x_led_init);
+
+static void __devexit pm860x_led_exit(void)
+{
+	platform_driver_unregister(&pm860x_led_driver);
+}
+module_exit(pm860x_led_exit);
+
+MODULE_DESCRIPTION("LED driver for Marvell PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:88pm860x-led");