/* * LED Driver for Dialog DA9052 PMICs. * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen <dchen@diasemi.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/leds.h> #include <linux/workqueue.h> #include <linux/slab.h> #include <linux/mfd/da9052/reg.h> #include <linux/mfd/da9052/da9052.h> #include <linux/mfd/da9052/pdata.h> #define DA9052_OPENDRAIN_OUTPUT 2 #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) #define DA9052_MASK_UPPER_NIBBLE 0xF0 #define DA9052_MASK_LOWER_NIBBLE 0x0F #define DA9052_NIBBLE_SHIFT 4 #define DA9052_MAX_BRIGHTNESS 0x5f struct da9052_led { struct led_classdev cdev; struct work_struct work; struct da9052 *da9052; unsigned char led_index; unsigned char id; int brightness; }; static unsigned char led_reg[] = { DA9052_LED_CONT_4_REG, DA9052_LED_CONT_5_REG, }; static int da9052_set_led_brightness(struct da9052_led *led) { u8 val; int error; val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); if (error < 0) dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", error); return error; } static void da9052_led_work(struct work_struct *work) { struct da9052_led *led = container_of(work, struct da9052_led, work); da9052_set_led_brightness(led); } static void da9052_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct da9052_led *led; led = container_of(led_cdev, struct da9052_led, cdev); led->brightness = value; schedule_work(&led->work); } static int da9052_configure_leds(struct da9052 *da9052) { int error; unsigned char register_value = DA9052_OPENDRAIN_OUTPUT | DA9052_SET_HIGH_LVL_OUTPUT; error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, DA9052_MASK_LOWER_NIBBLE, register_value); if (error < 0) { dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", error); return error; } error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, DA9052_MASK_UPPER_NIBBLE, register_value << DA9052_NIBBLE_SHIFT); if (error < 0) dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", error); return error; } static int da9052_led_probe(struct platform_device *pdev) { struct da9052_pdata *pdata; struct da9052 *da9052; struct led_platform_data *pled; struct da9052_led *led = NULL; int error = -ENODEV; int i; da9052 = dev_get_drvdata(pdev->dev.parent); pdata = dev_get_platdata(da9052->dev); if (pdata == NULL) { dev_err(&pdev->dev, "No platform data\n"); goto err; } pled = pdata->pled; if (pled == NULL) { dev_err(&pdev->dev, "No platform data for LED\n"); goto err; } led = devm_kzalloc(&pdev->dev, sizeof(struct da9052_led) * pled->num_leds, GFP_KERNEL); if (led == NULL) { dev_err(&pdev->dev, "Failed to alloc memory\n"); error = -ENOMEM; goto err; } for (i = 0; i < pled->num_leds; i++) { led[i].cdev.name = pled->leds[i].name; led[i].cdev.brightness_set = da9052_led_set; led[i].cdev.brightness = LED_OFF; led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; led[i].brightness = LED_OFF; led[i].led_index = pled->leds[i].flags; led[i].da9052 = dev_get_drvdata(pdev->dev.parent); INIT_WORK(&led[i].work, da9052_led_work); error = led_classdev_register(pdev->dev.parent, &led[i].cdev); if (error) { dev_err(&pdev->dev, "Failed to register led %d\n", led[i].led_index); goto err_register; } error = da9052_set_led_brightness(&led[i]); if (error) { dev_err(&pdev->dev, "Unable to init led %d\n", led[i].led_index); continue; } } error = da9052_configure_leds(led->da9052); if (error) { dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); goto err_register; } platform_set_drvdata(pdev, led); return 0; err_register: for (i = i - 1; i >= 0; i--) { led_classdev_unregister(&led[i].cdev); cancel_work_sync(&led[i].work); } err: return error; } static int da9052_led_remove(struct platform_device *pdev) { struct da9052_led *led = platform_get_drvdata(pdev); struct da9052_pdata *pdata; struct da9052 *da9052; struct led_platform_data *pled; int i; da9052 = dev_get_drvdata(pdev->dev.parent); pdata = dev_get_platdata(da9052->dev); pled = pdata->pled; for (i = 0; i < pled->num_leds; i++) { led[i].brightness = 0; da9052_set_led_brightness(&led[i]); led_classdev_unregister(&led[i].cdev); cancel_work_sync(&led[i].work); } return 0; } static struct platform_driver da9052_led_driver = { .driver = { .name = "da9052-leds", .owner = THIS_MODULE, }, .probe = da9052_led_probe, .remove = da9052_led_remove, }; module_platform_driver(da9052_led_driver); MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); MODULE_LICENSE("GPL");