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>

1 files changed, 175 insertions, 0 deletions

diff --git a/drivers/leds/leds-da903x.c b/drivers/leds/leds-da903x.c
new file mode 100644
index 000000000000..f1fddb18d70d
--- /dev/null
+++ b/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");