/* * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs * * Copyright 2009 Analog Devices Inc. * * Loosely derived from leds-da903x: * Copyright (C) 2008 Compulab, Ltd. * Mike Rapoport <mike@compulab.co.il> * * Copyright (C) 2006-2008 Marvell International Ltd. * Eric Miao <eric.miao@marvell.com> * * Licensed under the GPL-2 or later. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/leds.h> #include <linux/workqueue.h> #include <linux/mfd/adp5520.h> #include <linux/slab.h> struct adp5520_led { struct led_classdev cdev; struct work_struct work; struct device *master; enum led_brightness new_brightness; int id; int flags; }; static void adp5520_led_work(struct work_struct *work) { struct adp5520_led *led = container_of(work, struct adp5520_led, work); adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1, led->new_brightness >> 2); } static void adp5520_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct adp5520_led *led; led = container_of(led_cdev, struct adp5520_led, cdev); led->new_brightness = value; schedule_work(&led->work); } static int adp5520_led_setup(struct adp5520_led *led) { struct device *dev = led->master; int flags = led->flags; int ret = 0; switch (led->id) { case FLAG_ID_ADP5520_LED1_ADP5501_LED0: ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, (flags >> ADP5520_FLAG_OFFT_SHIFT) & ADP5520_FLAG_OFFT_MASK); ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, ADP5520_LED1_EN); break; case FLAG_ID_ADP5520_LED2_ADP5501_LED1: ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, ((flags >> ADP5520_FLAG_OFFT_SHIFT) & ADP5520_FLAG_OFFT_MASK) << 2); ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, ADP5520_R3_MODE); ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, ADP5520_LED2_EN); break; case FLAG_ID_ADP5520_LED3_ADP5501_LED2: ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, ((flags >> ADP5520_FLAG_OFFT_SHIFT) & ADP5520_FLAG_OFFT_MASK) << 4); ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, ADP5520_C3_MODE); ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, ADP5520_LED3_EN); break; } return ret; } static int adp5520_led_prepare(struct platform_device *pdev) { struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); struct device *dev = pdev->dev.parent; int ret = 0; ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0); ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0); ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0); ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6); ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in, pdata->fade_out)); return ret; } static int adp5520_led_probe(struct platform_device *pdev) { struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); struct adp5520_led *led, *led_dat; struct led_info *cur_led; int ret, i; if (pdata == NULL) { dev_err(&pdev->dev, "missing platform data\n"); return -ENODEV; } if (pdata->num_leds > ADP5520_01_MAXLEDS) { dev_err(&pdev->dev, "can't handle more than %d LEDS\n", ADP5520_01_MAXLEDS); return -EFAULT; } led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds, GFP_KERNEL); if (!led) return -ENOMEM; ret = adp5520_led_prepare(pdev); if (ret) { dev_err(&pdev->dev, "failed to write\n"); return ret; } for (i = 0; i < pdata->num_leds; ++i) { cur_led = &pdata->leds[i]; led_dat = &led[i]; led_dat->cdev.name = cur_led->name; led_dat->cdev.default_trigger = cur_led->default_trigger; led_dat->cdev.brightness_set = adp5520_led_set; led_dat->cdev.brightness = LED_OFF; if (cur_led->flags & ADP5520_FLAG_LED_MASK) led_dat->flags = cur_led->flags; else led_dat->flags = i + 1; led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK; led_dat->master = pdev->dev.parent; led_dat->new_brightness = LED_OFF; INIT_WORK(&led_dat->work, adp5520_led_work); ret = led_classdev_register(led_dat->master, &led_dat->cdev); if (ret) { dev_err(&pdev->dev, "failed to register LED %d\n", led_dat->id); goto err; } ret = adp5520_led_setup(led_dat); if (ret) { dev_err(&pdev->dev, "failed to write\n"); i++; goto err; } } platform_set_drvdata(pdev, led); return 0; err: if (i > 0) { for (i = i - 1; i >= 0; i--) { led_classdev_unregister(&led[i].cdev); cancel_work_sync(&led[i].work); } } return ret; } static int adp5520_led_remove(struct platform_device *pdev) { struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); struct adp5520_led *led; int i; led = platform_get_drvdata(pdev); adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); for (i = 0; i < pdata->num_leds; i++) { led_classdev_unregister(&led[i].cdev); cancel_work_sync(&led[i].work); } return 0; } static struct platform_driver adp5520_led_driver = { .driver = { .name = "adp5520-led", .owner = THIS_MODULE, }, .probe = adp5520_led_probe, .remove = adp5520_led_remove, }; module_platform_driver(adp5520_led_driver); MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:adp5520-led");