--- /dev/null
+/*
+ * 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");
projects / platform / kernel / kernel-mfld-blackbay.git / commitdiff