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>

1 files changed, 325 insertions, 0 deletions

diff --git a/drivers/leds/leds-88pm860x.c b/drivers/leds/leds-88pm860x.c
new file mode 100644
index 000000000000..d196073a6aeb
--- /dev/null
+++ b/drivers/leds/leds-88pm860x.c
@@ -0,0 +1,325 @@
+/*
+ * 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");