15ba73631SDavid Dajun Chen /* 25ba73631SDavid Dajun Chen * LED Driver for Dialog DA9052 PMICs. 35ba73631SDavid Dajun Chen * 45ba73631SDavid Dajun Chen * Copyright(c) 2012 Dialog Semiconductor Ltd. 55ba73631SDavid Dajun Chen * 65ba73631SDavid Dajun Chen * Author: David Dajun Chen <dchen@diasemi.com> 75ba73631SDavid Dajun Chen * 85ba73631SDavid Dajun Chen * This program is free software; you can redistribute it and/or modify it 95ba73631SDavid Dajun Chen * under the terms of the GNU General Public License as published by the 105ba73631SDavid Dajun Chen * Free Software Foundation; either version 2 of the License, or (at your 115ba73631SDavid Dajun Chen * option) any later version. 125ba73631SDavid Dajun Chen * 135ba73631SDavid Dajun Chen */ 145ba73631SDavid Dajun Chen 155ba73631SDavid Dajun Chen #include <linux/module.h> 165ba73631SDavid Dajun Chen #include <linux/kernel.h> 175ba73631SDavid Dajun Chen #include <linux/platform_device.h> 185ba73631SDavid Dajun Chen #include <linux/leds.h> 195ba73631SDavid Dajun Chen #include <linux/workqueue.h> 205ba73631SDavid Dajun Chen #include <linux/slab.h> 215ba73631SDavid Dajun Chen 225ba73631SDavid Dajun Chen #include <linux/mfd/da9052/reg.h> 235ba73631SDavid Dajun Chen #include <linux/mfd/da9052/da9052.h> 245ba73631SDavid Dajun Chen #include <linux/mfd/da9052/pdata.h> 255ba73631SDavid Dajun Chen 265ba73631SDavid Dajun Chen #define DA9052_OPENDRAIN_OUTPUT 2 275ba73631SDavid Dajun Chen #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) 285ba73631SDavid Dajun Chen #define DA9052_MASK_UPPER_NIBBLE 0xF0 295ba73631SDavid Dajun Chen #define DA9052_MASK_LOWER_NIBBLE 0x0F 305ba73631SDavid Dajun Chen #define DA9052_NIBBLE_SHIFT 4 315ba73631SDavid Dajun Chen #define DA9052_MAX_BRIGHTNESS 0x5f 325ba73631SDavid Dajun Chen 335ba73631SDavid Dajun Chen struct da9052_led { 345ba73631SDavid Dajun Chen struct led_classdev cdev; 355ba73631SDavid Dajun Chen struct work_struct work; 365ba73631SDavid Dajun Chen struct da9052 *da9052; 375ba73631SDavid Dajun Chen unsigned char led_index; 385ba73631SDavid Dajun Chen unsigned char id; 395ba73631SDavid Dajun Chen int brightness; 405ba73631SDavid Dajun Chen }; 415ba73631SDavid Dajun Chen 425ba73631SDavid Dajun Chen static unsigned char led_reg[] = { 435ba73631SDavid Dajun Chen DA9052_LED_CONT_4_REG, 445ba73631SDavid Dajun Chen DA9052_LED_CONT_5_REG, 455ba73631SDavid Dajun Chen }; 465ba73631SDavid Dajun Chen 475ba73631SDavid Dajun Chen static int da9052_set_led_brightness(struct da9052_led *led) 485ba73631SDavid Dajun Chen { 495ba73631SDavid Dajun Chen u8 val; 505ba73631SDavid Dajun Chen int error; 515ba73631SDavid Dajun Chen 525ba73631SDavid Dajun Chen val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; 535ba73631SDavid Dajun Chen 545ba73631SDavid Dajun Chen error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); 555ba73631SDavid Dajun Chen if (error < 0) 565ba73631SDavid Dajun Chen dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", 575ba73631SDavid Dajun Chen error); 585ba73631SDavid Dajun Chen return error; 595ba73631SDavid Dajun Chen } 605ba73631SDavid Dajun Chen 615ba73631SDavid Dajun Chen static void da9052_led_work(struct work_struct *work) 625ba73631SDavid Dajun Chen { 635ba73631SDavid Dajun Chen struct da9052_led *led = container_of(work, struct da9052_led, work); 645ba73631SDavid Dajun Chen 655ba73631SDavid Dajun Chen da9052_set_led_brightness(led); 665ba73631SDavid Dajun Chen } 675ba73631SDavid Dajun Chen 685ba73631SDavid Dajun Chen static void da9052_led_set(struct led_classdev *led_cdev, 695ba73631SDavid Dajun Chen enum led_brightness value) 705ba73631SDavid Dajun Chen { 715ba73631SDavid Dajun Chen struct da9052_led *led; 725ba73631SDavid Dajun Chen 735ba73631SDavid Dajun Chen led = container_of(led_cdev, struct da9052_led, cdev); 745ba73631SDavid Dajun Chen led->brightness = value; 755ba73631SDavid Dajun Chen schedule_work(&led->work); 765ba73631SDavid Dajun Chen } 775ba73631SDavid Dajun Chen 785ba73631SDavid Dajun Chen static int da9052_configure_leds(struct da9052 *da9052) 795ba73631SDavid Dajun Chen { 805ba73631SDavid Dajun Chen int error; 815ba73631SDavid Dajun Chen unsigned char register_value = DA9052_OPENDRAIN_OUTPUT 825ba73631SDavid Dajun Chen | DA9052_SET_HIGH_LVL_OUTPUT; 835ba73631SDavid Dajun Chen 845ba73631SDavid Dajun Chen error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 855ba73631SDavid Dajun Chen DA9052_MASK_LOWER_NIBBLE, 865ba73631SDavid Dajun Chen register_value); 875ba73631SDavid Dajun Chen 885ba73631SDavid Dajun Chen if (error < 0) { 895ba73631SDavid Dajun Chen dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 905ba73631SDavid Dajun Chen error); 915ba73631SDavid Dajun Chen return error; 925ba73631SDavid Dajun Chen } 935ba73631SDavid Dajun Chen 945ba73631SDavid Dajun Chen error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 955ba73631SDavid Dajun Chen DA9052_MASK_UPPER_NIBBLE, 965ba73631SDavid Dajun Chen register_value << DA9052_NIBBLE_SHIFT); 975ba73631SDavid Dajun Chen if (error < 0) 985ba73631SDavid Dajun Chen dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 995ba73631SDavid Dajun Chen error); 1005ba73631SDavid Dajun Chen 1015ba73631SDavid Dajun Chen return error; 1025ba73631SDavid Dajun Chen } 1035ba73631SDavid Dajun Chen 10498ea1ea2SBill Pemberton static int da9052_led_probe(struct platform_device *pdev) 1055ba73631SDavid Dajun Chen { 1065ba73631SDavid Dajun Chen struct da9052_pdata *pdata; 1075ba73631SDavid Dajun Chen struct da9052 *da9052; 1085ba73631SDavid Dajun Chen struct led_platform_data *pled; 1095ba73631SDavid Dajun Chen struct da9052_led *led = NULL; 1105ba73631SDavid Dajun Chen int error = -ENODEV; 1115ba73631SDavid Dajun Chen int i; 1125ba73631SDavid Dajun Chen 1135ba73631SDavid Dajun Chen da9052 = dev_get_drvdata(pdev->dev.parent); 11487aae1eaSJingoo Han pdata = dev_get_platdata(da9052->dev); 1155ba73631SDavid Dajun Chen if (pdata == NULL) { 1165ba73631SDavid Dajun Chen dev_err(&pdev->dev, "No platform data\n"); 1175ba73631SDavid Dajun Chen goto err; 1185ba73631SDavid Dajun Chen } 1195ba73631SDavid Dajun Chen 1205ba73631SDavid Dajun Chen pled = pdata->pled; 1215ba73631SDavid Dajun Chen if (pled == NULL) { 1225ba73631SDavid Dajun Chen dev_err(&pdev->dev, "No platform data for LED\n"); 1235ba73631SDavid Dajun Chen goto err; 1245ba73631SDavid Dajun Chen } 1255ba73631SDavid Dajun Chen 1265ba73631SDavid Dajun Chen led = devm_kzalloc(&pdev->dev, 1275ba73631SDavid Dajun Chen sizeof(struct da9052_led) * pled->num_leds, 1285ba73631SDavid Dajun Chen GFP_KERNEL); 1290c9a03b6SXiubo Li if (!led) { 1305ba73631SDavid Dajun Chen error = -ENOMEM; 1315ba73631SDavid Dajun Chen goto err; 1325ba73631SDavid Dajun Chen } 1335ba73631SDavid Dajun Chen 1345ba73631SDavid Dajun Chen for (i = 0; i < pled->num_leds; i++) { 1355ba73631SDavid Dajun Chen led[i].cdev.name = pled->leds[i].name; 1365ba73631SDavid Dajun Chen led[i].cdev.brightness_set = da9052_led_set; 1375ba73631SDavid Dajun Chen led[i].cdev.brightness = LED_OFF; 1385ba73631SDavid Dajun Chen led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; 1395ba73631SDavid Dajun Chen led[i].brightness = LED_OFF; 1405ba73631SDavid Dajun Chen led[i].led_index = pled->leds[i].flags; 1415ba73631SDavid Dajun Chen led[i].da9052 = dev_get_drvdata(pdev->dev.parent); 1425ba73631SDavid Dajun Chen INIT_WORK(&led[i].work, da9052_led_work); 1435ba73631SDavid Dajun Chen 1445ba73631SDavid Dajun Chen error = led_classdev_register(pdev->dev.parent, &led[i].cdev); 1455ba73631SDavid Dajun Chen if (error) { 1465ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Failed to register led %d\n", 1475ba73631SDavid Dajun Chen led[i].led_index); 1485ba73631SDavid Dajun Chen goto err_register; 1495ba73631SDavid Dajun Chen } 1505ba73631SDavid Dajun Chen 1515ba73631SDavid Dajun Chen error = da9052_set_led_brightness(&led[i]); 1525ba73631SDavid Dajun Chen if (error) { 1535ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Unable to init led %d\n", 1545ba73631SDavid Dajun Chen led[i].led_index); 1555ba73631SDavid Dajun Chen continue; 1565ba73631SDavid Dajun Chen } 1575ba73631SDavid Dajun Chen } 1585ba73631SDavid Dajun Chen error = da9052_configure_leds(led->da9052); 1595ba73631SDavid Dajun Chen if (error) { 1605ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); 1615ba73631SDavid Dajun Chen goto err_register; 1625ba73631SDavid Dajun Chen } 1635ba73631SDavid Dajun Chen 1645ba73631SDavid Dajun Chen platform_set_drvdata(pdev, led); 1655ba73631SDavid Dajun Chen 1665ba73631SDavid Dajun Chen return 0; 1675ba73631SDavid Dajun Chen 1685ba73631SDavid Dajun Chen err_register: 1695ba73631SDavid Dajun Chen for (i = i - 1; i >= 0; i--) { 1705ba73631SDavid Dajun Chen led_classdev_unregister(&led[i].cdev); 1715ba73631SDavid Dajun Chen cancel_work_sync(&led[i].work); 1725ba73631SDavid Dajun Chen } 1735ba73631SDavid Dajun Chen err: 1745ba73631SDavid Dajun Chen return error; 1755ba73631SDavid Dajun Chen } 1765ba73631SDavid Dajun Chen 177678e8a6bSBill Pemberton static int da9052_led_remove(struct platform_device *pdev) 1785ba73631SDavid Dajun Chen { 1795ba73631SDavid Dajun Chen struct da9052_led *led = platform_get_drvdata(pdev); 1805ba73631SDavid Dajun Chen struct da9052_pdata *pdata; 1815ba73631SDavid Dajun Chen struct da9052 *da9052; 1825ba73631SDavid Dajun Chen struct led_platform_data *pled; 1835ba73631SDavid Dajun Chen int i; 1845ba73631SDavid Dajun Chen 1855ba73631SDavid Dajun Chen da9052 = dev_get_drvdata(pdev->dev.parent); 18687aae1eaSJingoo Han pdata = dev_get_platdata(da9052->dev); 1875ba73631SDavid Dajun Chen pled = pdata->pled; 1885ba73631SDavid Dajun Chen 1895ba73631SDavid Dajun Chen for (i = 0; i < pled->num_leds; i++) { 1905ba73631SDavid Dajun Chen led[i].brightness = 0; 1915ba73631SDavid Dajun Chen da9052_set_led_brightness(&led[i]); 1925ba73631SDavid Dajun Chen led_classdev_unregister(&led[i].cdev); 1935ba73631SDavid Dajun Chen cancel_work_sync(&led[i].work); 1945ba73631SDavid Dajun Chen } 1955ba73631SDavid Dajun Chen 1965ba73631SDavid Dajun Chen return 0; 1975ba73631SDavid Dajun Chen } 1985ba73631SDavid Dajun Chen 1995ba73631SDavid Dajun Chen static struct platform_driver da9052_led_driver = { 2005ba73631SDavid Dajun Chen .driver = { 2015ba73631SDavid Dajun Chen .name = "da9052-leds", 2025ba73631SDavid Dajun Chen .owner = THIS_MODULE, 2035ba73631SDavid Dajun Chen }, 2045ba73631SDavid Dajun Chen .probe = da9052_led_probe, 205df07cf81SBill Pemberton .remove = da9052_led_remove, 2065ba73631SDavid Dajun Chen }; 2075ba73631SDavid Dajun Chen 2085ba73631SDavid Dajun Chen module_platform_driver(da9052_led_driver); 2095ba73631SDavid Dajun Chen 2105ba73631SDavid Dajun Chen MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); 2115ba73631SDavid Dajun Chen MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); 2125ba73631SDavid Dajun Chen MODULE_LICENSE("GPL"); 213