/* * Backlight Driver for Dialog DA9052 PMICs * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen * * 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 #include #include #include #include #include #include #define DA9052_MAX_BRIGHTNESS 0xFF enum { DA9052_WLEDS_OFF, DA9052_WLEDS_ON, }; enum { DA9052_TYPE_WLED1, DA9052_TYPE_WLED2, DA9052_TYPE_WLED3, }; static const unsigned char wled_bank[] = { DA9052_LED1_CONF_REG, DA9052_LED2_CONF_REG, DA9052_LED3_CONF_REG, }; struct da9052_bl { struct da9052 *da9052; uint brightness; uint state; uint led_reg; }; static int da9052_adjust_wled_brightness(struct da9052_bl *wleds) { unsigned char boost_en; unsigned char i_sink; int ret; boost_en = 0x3F; i_sink = 0xFF; if (wleds->state == DA9052_WLEDS_OFF) { boost_en = 0x00; i_sink = 0x00; } ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en); if (ret < 0) return ret; ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink); if (ret < 0) return ret; ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0); if (ret < 0) return ret; usleep_range(10000, 11000); if (wleds->brightness) { ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], wleds->brightness); if (ret < 0) return ret; } return 0; } static int da9052_backlight_update_status(struct backlight_device *bl) { int brightness = bl->props.brightness; struct da9052_bl *wleds = bl_get_data(bl); wleds->brightness = brightness; wleds->state = DA9052_WLEDS_ON; return da9052_adjust_wled_brightness(wleds); } static int da9052_backlight_get_brightness(struct backlight_device *bl) { struct da9052_bl *wleds = bl_get_data(bl); return wleds->brightness; } static const struct backlight_ops da9052_backlight_ops = { .update_status = da9052_backlight_update_status, .get_brightness = da9052_backlight_get_brightness, }; static int da9052_backlight_probe(struct platform_device *pdev) { struct backlight_device *bl; struct backlight_properties props; struct da9052_bl *wleds; wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL); if (!wleds) return -ENOMEM; wleds->da9052 = dev_get_drvdata(pdev->dev.parent); wleds->brightness = 0; wleds->led_reg = platform_get_device_id(pdev)->driver_data; wleds->state = DA9052_WLEDS_OFF; props.type = BACKLIGHT_RAW; props.max_brightness = DA9052_MAX_BRIGHTNESS; bl = devm_backlight_device_register(&pdev->dev, pdev->name, wleds->da9052->dev, wleds, &da9052_backlight_ops, &props); if (IS_ERR(bl)) { dev_err(&pdev->dev, "Failed to register backlight\n"); return PTR_ERR(bl); } bl->props.max_brightness = DA9052_MAX_BRIGHTNESS; bl->props.brightness = 0; platform_set_drvdata(pdev, bl); return da9052_adjust_wled_brightness(wleds); } static int da9052_backlight_remove(struct platform_device *pdev) { struct backlight_device *bl = platform_get_drvdata(pdev); struct da9052_bl *wleds = bl_get_data(bl); wleds->brightness = 0; wleds->state = DA9052_WLEDS_OFF; da9052_adjust_wled_brightness(wleds); return 0; } static const struct platform_device_id da9052_wled_ids[] = { { .name = "da9052-wled1", .driver_data = DA9052_TYPE_WLED1, }, { .name = "da9052-wled2", .driver_data = DA9052_TYPE_WLED2, }, { .name = "da9052-wled3", .driver_data = DA9052_TYPE_WLED3, }, { }, }; static struct platform_driver da9052_wled_driver = { .probe = da9052_backlight_probe, .remove = da9052_backlight_remove, .id_table = da9052_wled_ids, .driver = { .name = "da9052-wled", }, }; module_platform_driver(da9052_wled_driver); MODULE_AUTHOR("David Dajun Chen "); MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-backlight"); /option>space:mode:
Diffstat (limited to 'drivers/usb/misc/usbsevseg.c')