diff options
Diffstat (limited to 'drivers/leds/leds-88pm860x.c')
| -rw-r--r-- | drivers/leds/leds-88pm860x.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/drivers/leds/leds-88pm860x.c b/drivers/leds/leds-88pm860x.c new file mode 100644 index 000000000000..16a60c06c96c --- /dev/null +++ b/drivers/leds/leds-88pm860x.c @@ -0,0 +1,326 @@ +/* + * 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/slab.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"); |
