leds: da903x: Add support for LEDs found on DA9030/DA9034

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

drivers/leds/Kconfig

@@ -157,6 +157,13 @@ config LEDS_PCA955X
 	  LED driver chips accessed via the I2C bus.  Supported
 	  devices include PCA9550, PCA9551, PCA9552, and PCA9553.
 
+config LEDS_DA903X
+	tristate "LED Support for DA9030/DA9034 PMIC"
+	depends on LEDS_CLASS && PMIC_DA903X
+	help
+	  This option enables support for on-chip LED drivers found
+	  on Dialog Semiconductor DA9030/DA9034 PMICs.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS

drivers/leds/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o
 obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o
 obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o
 obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o
+obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o

drivers/leds/leds-da903x.c

@@ -0,0 +1,175 @@
+/*
+ * LEDs driver for Dialog Semiconductor DA9030/DA9034
+ *
+ * Copyright (C) 2008 Compulab, Ltd.
+ * 	Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ * 	Eric Miao <eric.miao@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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mfd/da903x.h>
+
+#define DA9030_LED1_CONTROL	0x20
+#define DA9030_LED2_CONTROL	0x21
+#define DA9030_LED3_CONTROL	0x22
+#define DA9030_LED4_CONTROL	0x23
+#define DA9030_LEDPC_CONTROL	0x24
+#define DA9030_MISC_CONTROL_A	0x26	/* Vibrator Control */
+
+#define DA9034_LED1_CONTROL	0x35
+#define DA9034_LED2_CONTROL	0x36
+#define DA9034_VIBRA		0x40
+
+struct da903x_led {
+	struct led_classdev	cdev;
+	struct work_struct	work;
+	struct device		*master;
+	enum led_brightness	new_brightness;
+	int			id;
+	int			flags;
+};
+
+#define DA9030_LED_OFFSET(id)	((id) - DA9030_ID_LED_1)
+#define DA9034_LED_OFFSET(id)	((id) - DA9034_ID_LED_1)
+
+static void da903x_led_work(struct work_struct *work)
+{
+	struct da903x_led *led = container_of(work, struct da903x_led, work);
+	uint8_t val;
+	int offset;
+
+	switch (led->id) {
+	case DA9030_ID_LED_1:
+	case DA9030_ID_LED_2:
+	case DA9030_ID_LED_3:
+	case DA9030_ID_LED_4:
+	case DA9030_ID_LED_PC:
+		offset = DA9030_LED_OFFSET(led->id);
+		val = led->flags & ~0x87;
+		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
+		val |= (led->new_brightness >> 5) & 0x7; /* PWM<2:0> */
+		da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
+		break;
+	case DA9030_ID_VIBRA:
+		val = led->flags & ~0x80;
+		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
+		da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
+		break;
+	case DA9034_ID_LED_1:
+	case DA9034_ID_LED_2:
+		offset = DA9034_LED_OFFSET(led->id);
+		val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
+		val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
+		da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
+		break;
+	case DA9034_ID_VIBRA:
+		val = led->new_brightness & 0xfe;
+		da903x_write(led->master, DA9034_VIBRA, val);
+		break;
+	}
+}
+
+static void da903x_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct da903x_led *led;
+	
+	led = container_of(led_cdev, struct da903x_led, cdev);
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+static int __devinit da903x_led_probe(struct platform_device *pdev)
+{
+	struct led_info *pdata = pdev->dev.platform_data;
+	struct da903x_led *led;
+	int id, ret;
+
+	if (pdata == NULL)
+		return 0;
+
+	id = pdev->id;
+
+	if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
+	      (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
+		dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
+		return -EINVAL;
+	}
+
+	led = kzalloc(sizeof(struct da903x_led), GFP_KERNEL);
+	if (led == NULL) {
+		dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
+		return -ENOMEM;
+	}
+
+	led->cdev.name = pdata->name;
+	led->cdev.default_trigger = pdata->default_trigger;
+	led->cdev.brightness_set = da903x_led_set;
+	led->cdev.brightness = LED_OFF;
+
+	led->id = id;
+	led->flags = pdata->flags;
+	led->master = pdev->dev.parent;
+	led->new_brightness = LED_OFF;
+
+	INIT_WORK(&led->work, da903x_led_work);
+
+	ret = led_classdev_register(led->master, &led->cdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register LED %d\n", id);
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, led);
+	return 0;
+
+err:
+	kfree(led);
+	return ret;
+}
+
+static int __devexit da903x_led_remove(struct platform_device *pdev)
+{
+	struct da903x_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+	kfree(led);
+	return 0;
+}
+
+static struct platform_driver da903x_led_driver = {
+	.driver	= {
+		.name	= "da903x-led",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da903x_led_probe,
+	.remove		= __devexit_p(da903x_led_remove),
+};
+
+static int __init da903x_led_init(void)
+{
+	return platform_driver_register(&da903x_led_driver);
+}
+module_init(da903x_led_init);
+
+static void __exit da903x_led_exit(void)
+{
+	platform_driver_unregister(&da903x_led_driver);
+}
+module_exit(da903x_led_exit);
+
+MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
+	      "Mike Rapoport <mike@compulab.co.il>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da903x-led");