/* * 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", .owner = THIS_MODULE, }, .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");