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/init.h> 185ba73631SDavid Dajun Chen #include <linux/platform_device.h> 195ba73631SDavid Dajun Chen #include <linux/leds.h> 205ba73631SDavid Dajun Chen #include <linux/workqueue.h> 215ba73631SDavid Dajun Chen #include <linux/slab.h> 225ba73631SDavid Dajun Chen 235ba73631SDavid Dajun Chen #include <linux/mfd/da9052/reg.h> 245ba73631SDavid Dajun Chen #include <linux/mfd/da9052/da9052.h> 255ba73631SDavid Dajun Chen #include <linux/mfd/da9052/pdata.h> 265ba73631SDavid Dajun Chen 275ba73631SDavid Dajun Chen #define DA9052_OPENDRAIN_OUTPUT 2 285ba73631SDavid Dajun Chen #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) 295ba73631SDavid Dajun Chen #define DA9052_MASK_UPPER_NIBBLE 0xF0 305ba73631SDavid Dajun Chen #define DA9052_MASK_LOWER_NIBBLE 0x0F 315ba73631SDavid Dajun Chen #define DA9052_NIBBLE_SHIFT 4 325ba73631SDavid Dajun Chen #define DA9052_MAX_BRIGHTNESS 0x5f 335ba73631SDavid Dajun Chen 345ba73631SDavid Dajun Chen struct da9052_led { 355ba73631SDavid Dajun Chen struct led_classdev cdev; 365ba73631SDavid Dajun Chen struct work_struct work; 375ba73631SDavid Dajun Chen struct da9052 *da9052; 385ba73631SDavid Dajun Chen unsigned char led_index; 395ba73631SDavid Dajun Chen unsigned char id; 405ba73631SDavid Dajun Chen int brightness; 415ba73631SDavid Dajun Chen }; 425ba73631SDavid Dajun Chen 435ba73631SDavid Dajun Chen static unsigned char led_reg[] = { 445ba73631SDavid Dajun Chen DA9052_LED_CONT_4_REG, 455ba73631SDavid Dajun Chen DA9052_LED_CONT_5_REG, 465ba73631SDavid Dajun Chen }; 475ba73631SDavid Dajun Chen 485ba73631SDavid Dajun Chen static int da9052_set_led_brightness(struct da9052_led *led) 495ba73631SDavid Dajun Chen { 505ba73631SDavid Dajun Chen u8 val; 515ba73631SDavid Dajun Chen int error; 525ba73631SDavid Dajun Chen 535ba73631SDavid Dajun Chen val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; 545ba73631SDavid Dajun Chen 555ba73631SDavid Dajun Chen error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); 565ba73631SDavid Dajun Chen if (error < 0) 575ba73631SDavid Dajun Chen dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", 585ba73631SDavid Dajun Chen error); 595ba73631SDavid Dajun Chen return error; 605ba73631SDavid Dajun Chen } 615ba73631SDavid Dajun Chen 625ba73631SDavid Dajun Chen static void da9052_led_work(struct work_struct *work) 635ba73631SDavid Dajun Chen { 645ba73631SDavid Dajun Chen struct da9052_led *led = container_of(work, struct da9052_led, work); 655ba73631SDavid Dajun Chen 665ba73631SDavid Dajun Chen da9052_set_led_brightness(led); 675ba73631SDavid Dajun Chen } 685ba73631SDavid Dajun Chen 695ba73631SDavid Dajun Chen static void da9052_led_set(struct led_classdev *led_cdev, 705ba73631SDavid Dajun Chen enum led_brightness value) 715ba73631SDavid Dajun Chen { 725ba73631SDavid Dajun Chen struct da9052_led *led; 735ba73631SDavid Dajun Chen 745ba73631SDavid Dajun Chen led = container_of(led_cdev, struct da9052_led, cdev); 755ba73631SDavid Dajun Chen led->brightness = value; 765ba73631SDavid Dajun Chen schedule_work(&led->work); 775ba73631SDavid Dajun Chen } 785ba73631SDavid Dajun Chen 795ba73631SDavid Dajun Chen static int da9052_configure_leds(struct da9052 *da9052) 805ba73631SDavid Dajun Chen { 815ba73631SDavid Dajun Chen int error; 825ba73631SDavid Dajun Chen unsigned char register_value = DA9052_OPENDRAIN_OUTPUT 835ba73631SDavid Dajun Chen | DA9052_SET_HIGH_LVL_OUTPUT; 845ba73631SDavid Dajun Chen 855ba73631SDavid Dajun Chen error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 865ba73631SDavid Dajun Chen DA9052_MASK_LOWER_NIBBLE, 875ba73631SDavid Dajun Chen register_value); 885ba73631SDavid Dajun Chen 895ba73631SDavid Dajun Chen if (error < 0) { 905ba73631SDavid Dajun Chen dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 915ba73631SDavid Dajun Chen error); 925ba73631SDavid Dajun Chen return error; 935ba73631SDavid Dajun Chen } 945ba73631SDavid Dajun Chen 955ba73631SDavid Dajun Chen error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 965ba73631SDavid Dajun Chen DA9052_MASK_UPPER_NIBBLE, 975ba73631SDavid Dajun Chen register_value << DA9052_NIBBLE_SHIFT); 985ba73631SDavid Dajun Chen if (error < 0) 995ba73631SDavid Dajun Chen dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 1005ba73631SDavid Dajun Chen error); 1015ba73631SDavid Dajun Chen 1025ba73631SDavid Dajun Chen return error; 1035ba73631SDavid Dajun Chen } 1045ba73631SDavid Dajun Chen 1055ba73631SDavid Dajun Chen static int __devinit da9052_led_probe(struct platform_device *pdev) 1065ba73631SDavid Dajun Chen { 1075ba73631SDavid Dajun Chen struct da9052_pdata *pdata; 1085ba73631SDavid Dajun Chen struct da9052 *da9052; 1095ba73631SDavid Dajun Chen struct led_platform_data *pled; 1105ba73631SDavid Dajun Chen struct da9052_led *led = NULL; 1115ba73631SDavid Dajun Chen int error = -ENODEV; 1125ba73631SDavid Dajun Chen int i; 1135ba73631SDavid Dajun Chen 1145ba73631SDavid Dajun Chen da9052 = dev_get_drvdata(pdev->dev.parent); 1155ba73631SDavid Dajun Chen pdata = da9052->dev->platform_data; 1165ba73631SDavid Dajun Chen if (pdata == NULL) { 1175ba73631SDavid Dajun Chen dev_err(&pdev->dev, "No platform data\n"); 1185ba73631SDavid Dajun Chen goto err; 1195ba73631SDavid Dajun Chen } 1205ba73631SDavid Dajun Chen 1215ba73631SDavid Dajun Chen pled = pdata->pled; 1225ba73631SDavid Dajun Chen if (pled == NULL) { 1235ba73631SDavid Dajun Chen dev_err(&pdev->dev, "No platform data for LED\n"); 1245ba73631SDavid Dajun Chen goto err; 1255ba73631SDavid Dajun Chen } 1265ba73631SDavid Dajun Chen 1275ba73631SDavid Dajun Chen led = devm_kzalloc(&pdev->dev, 1285ba73631SDavid Dajun Chen sizeof(struct da9052_led) * pled->num_leds, 1295ba73631SDavid Dajun Chen GFP_KERNEL); 1305ba73631SDavid Dajun Chen if (led == NULL) { 1315ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Failed to alloc memory\n"); 1325ba73631SDavid Dajun Chen error = -ENOMEM; 1335ba73631SDavid Dajun Chen goto err; 1345ba73631SDavid Dajun Chen } 1355ba73631SDavid Dajun Chen 1365ba73631SDavid Dajun Chen for (i = 0; i < pled->num_leds; i++) { 1375ba73631SDavid Dajun Chen led[i].cdev.name = pled->leds[i].name; 1385ba73631SDavid Dajun Chen led[i].cdev.brightness_set = da9052_led_set; 1395ba73631SDavid Dajun Chen led[i].cdev.brightness = LED_OFF; 1405ba73631SDavid Dajun Chen led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; 1415ba73631SDavid Dajun Chen led[i].brightness = LED_OFF; 1425ba73631SDavid Dajun Chen led[i].led_index = pled->leds[i].flags; 1435ba73631SDavid Dajun Chen led[i].da9052 = dev_get_drvdata(pdev->dev.parent); 1445ba73631SDavid Dajun Chen INIT_WORK(&led[i].work, da9052_led_work); 1455ba73631SDavid Dajun Chen 1465ba73631SDavid Dajun Chen error = led_classdev_register(pdev->dev.parent, &led[i].cdev); 1475ba73631SDavid Dajun Chen if (error) { 1485ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Failed to register led %d\n", 1495ba73631SDavid Dajun Chen led[i].led_index); 1505ba73631SDavid Dajun Chen goto err_register; 1515ba73631SDavid Dajun Chen } 1525ba73631SDavid Dajun Chen 1535ba73631SDavid Dajun Chen error = da9052_set_led_brightness(&led[i]); 1545ba73631SDavid Dajun Chen if (error) { 1555ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Unable to init led %d\n", 1565ba73631SDavid Dajun Chen led[i].led_index); 1575ba73631SDavid Dajun Chen continue; 1585ba73631SDavid Dajun Chen } 1595ba73631SDavid Dajun Chen } 1605ba73631SDavid Dajun Chen error = da9052_configure_leds(led->da9052); 1615ba73631SDavid Dajun Chen if (error) { 1625ba73631SDavid Dajun Chen dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); 1635ba73631SDavid Dajun Chen goto err_register; 1645ba73631SDavid Dajun Chen } 1655ba73631SDavid Dajun Chen 1665ba73631SDavid Dajun Chen platform_set_drvdata(pdev, led); 1675ba73631SDavid Dajun Chen 1685ba73631SDavid Dajun Chen return 0; 1695ba73631SDavid Dajun Chen 1705ba73631SDavid Dajun Chen err_register: 1715ba73631SDavid Dajun Chen for (i = i - 1; i >= 0; i--) { 1725ba73631SDavid Dajun Chen led_classdev_unregister(&led[i].cdev); 1735ba73631SDavid Dajun Chen cancel_work_sync(&led[i].work); 1745ba73631SDavid Dajun Chen } 1755ba73631SDavid Dajun Chen err: 1765ba73631SDavid Dajun Chen return error; 1775ba73631SDavid Dajun Chen } 1785ba73631SDavid Dajun Chen 1795ba73631SDavid Dajun Chen static int __devexit da9052_led_remove(struct platform_device *pdev) 1805ba73631SDavid Dajun Chen { 1815ba73631SDavid Dajun Chen struct da9052_led *led = platform_get_drvdata(pdev); 1825ba73631SDavid Dajun Chen struct da9052_pdata *pdata; 1835ba73631SDavid Dajun Chen struct da9052 *da9052; 1845ba73631SDavid Dajun Chen struct led_platform_data *pled; 1855ba73631SDavid Dajun Chen int i; 1865ba73631SDavid Dajun Chen 1875ba73631SDavid Dajun Chen da9052 = dev_get_drvdata(pdev->dev.parent); 1885ba73631SDavid Dajun Chen pdata = da9052->dev->platform_data; 1895ba73631SDavid Dajun Chen pled = pdata->pled; 1905ba73631SDavid Dajun Chen 1915ba73631SDavid Dajun Chen for (i = 0; i < pled->num_leds; i++) { 1925ba73631SDavid Dajun Chen led[i].brightness = 0; 1935ba73631SDavid Dajun Chen da9052_set_led_brightness(&led[i]); 1945ba73631SDavid Dajun Chen led_classdev_unregister(&led[i].cdev); 1955ba73631SDavid Dajun Chen cancel_work_sync(&led[i].work); 1965ba73631SDavid Dajun Chen } 1975ba73631SDavid Dajun Chen 1985ba73631SDavid Dajun Chen return 0; 1995ba73631SDavid Dajun Chen } 2005ba73631SDavid Dajun Chen 2015ba73631SDavid Dajun Chen static struct platform_driver da9052_led_driver = { 2025ba73631SDavid Dajun Chen .driver = { 2035ba73631SDavid Dajun Chen .name = "da9052-leds", 2045ba73631SDavid Dajun Chen .owner = THIS_MODULE, 2055ba73631SDavid Dajun Chen }, 2065ba73631SDavid Dajun Chen .probe = da9052_led_probe, 2075ba73631SDavid Dajun Chen .remove = __devexit_p(da9052_led_remove), 2085ba73631SDavid Dajun Chen }; 2095ba73631SDavid Dajun Chen 2105ba73631SDavid Dajun Chen module_platform_driver(da9052_led_driver); 2115ba73631SDavid Dajun Chen 2125ba73631SDavid Dajun Chen MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); 2135ba73631SDavid Dajun Chen MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); 2145ba73631SDavid Dajun Chen MODULE_LICENSE("GPL"); 215