diff options
Diffstat (limited to 'drivers/leds/leds-da903x.c')
| -rw-r--r-- | drivers/leds/leds-da903x.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/leds/leds-da903x.c b/drivers/leds/leds-da903x.c new file mode 100644 index 000000000..952ba96e5 --- /dev/null +++ b/drivers/leds/leds-da903x.c @@ -0,0 +1,158 @@ +/* + * 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/platform_device.h> +#include <linux/leds.h> +#include <linux/workqueue.h> +#include <linux/mfd/da903x.h> +#include <linux/slab.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 |= (0x7 - (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 da903x_led_probe(struct platform_device *pdev) +{ + struct led_info *pdata = dev_get_platdata(&pdev->dev); + 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 = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL); + if (!led) + 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); + return ret; + } + + platform_set_drvdata(pdev, led); + return 0; +} + +static int da903x_led_remove(struct platform_device *pdev) +{ + struct da903x_led *led = platform_get_drvdata(pdev); + + led_classdev_unregister(&led->cdev); + return 0; +} + +static struct platform_driver da903x_led_driver = { + .driver = { + .name = "da903x-led", + }, + .probe = da903x_led_probe, + .remove = da903x_led_remove, +}; + +module_platform_driver(da903x_led_driver); + +MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034"); +MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); +MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da903x-led"); |