1/* 2 * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs 3 * 4 * Copyright 2009 Analog Devices Inc. 5 * 6 * Loosely derived from leds-da903x: 7 * Copyright (C) 2008 Compulab, Ltd. 8 * Mike Rapoport <mike@compulab.co.il> 9 * 10 * Copyright (C) 2006-2008 Marvell International Ltd. 11 * Eric Miao <eric.miao@marvell.com> 12 * 13 * Licensed under the GPL-2 or later. 14 */ 15 16#include <linux/module.h> 17#include <linux/kernel.h> 18#include <linux/init.h> 19#include <linux/platform_device.h> 20#include <linux/leds.h> 21#include <linux/workqueue.h> 22#include <linux/mfd/adp5520.h> 23#include <linux/slab.h> 24 25struct adp5520_led { 26 struct led_classdev cdev; 27 struct work_struct work; 28 struct device *master; 29 enum led_brightness new_brightness; 30 int id; 31 int flags; 32}; 33 34static void adp5520_led_work(struct work_struct *work) 35{ 36 struct adp5520_led *led = container_of(work, struct adp5520_led, work); 37 adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1, 38 led->new_brightness >> 2); 39} 40 41static void adp5520_led_set(struct led_classdev *led_cdev, 42 enum led_brightness value) 43{ 44 struct adp5520_led *led; 45 46 led = container_of(led_cdev, struct adp5520_led, cdev); 47 led->new_brightness = value; 48 schedule_work(&led->work); 49} 50 51static int adp5520_led_setup(struct adp5520_led *led) 52{ 53 struct device *dev = led->master; 54 int flags = led->flags; 55 int ret = 0; 56 57 switch (led->id) { 58 case FLAG_ID_ADP5520_LED1_ADP5501_LED0: 59 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 60 (flags >> ADP5520_FLAG_OFFT_SHIFT) & 61 ADP5520_FLAG_OFFT_MASK); 62 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 63 ADP5520_LED1_EN); 64 break; 65 case FLAG_ID_ADP5520_LED2_ADP5501_LED1: 66 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 67 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 68 ADP5520_FLAG_OFFT_MASK) << 2); 69 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 70 ADP5520_R3_MODE); 71 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 72 ADP5520_LED2_EN); 73 break; 74 case FLAG_ID_ADP5520_LED3_ADP5501_LED2: 75 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 76 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 77 ADP5520_FLAG_OFFT_MASK) << 4); 78 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 79 ADP5520_C3_MODE); 80 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 81 ADP5520_LED3_EN); 82 break; 83 } 84 85 return ret; 86} 87 88static int __devinit adp5520_led_prepare(struct platform_device *pdev) 89{ 90 struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data; 91 struct device *dev = pdev->dev.parent; 92 int ret = 0; 93 94 ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0); 95 ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0); 96 ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0); 97 ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6); 98 ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in, 99 pdata->fade_out)); 100 101 return ret; 102} 103 104static int __devinit adp5520_led_probe(struct platform_device *pdev) 105{ 106 struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data; 107 struct adp5520_led *led, *led_dat; 108 struct led_info *cur_led; 109 int ret, i; 110 111 if (pdata == NULL) { 112 dev_err(&pdev->dev, "missing platform data\n"); 113 return -ENODEV; 114 } 115 116 if (pdata->num_leds > ADP5520_01_MAXLEDS) { 117 dev_err(&pdev->dev, "can't handle more than %d LEDS\n", 118 ADP5520_01_MAXLEDS); 119 return -EFAULT; 120 } 121 122 led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL); 123 if (led == NULL) { 124 dev_err(&pdev->dev, "failed to alloc memory\n"); 125 return -ENOMEM; 126 } 127 128 ret = adp5520_led_prepare(pdev); 129 130 if (ret) { 131 dev_err(&pdev->dev, "failed to write\n"); 132 goto err_free; 133 } 134 135 for (i = 0; i < pdata->num_leds; ++i) { 136 cur_led = &pdata->leds[i]; 137 led_dat = &led[i]; 138 139 led_dat->cdev.name = cur_led->name; 140 led_dat->cdev.default_trigger = cur_led->default_trigger; 141 led_dat->cdev.brightness_set = adp5520_led_set; 142 led_dat->cdev.brightness = LED_OFF; 143 144 if (cur_led->flags & ADP5520_FLAG_LED_MASK) 145 led_dat->flags = cur_led->flags; 146 else 147 led_dat->flags = i + 1; 148 149 led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK; 150 151 led_dat->master = pdev->dev.parent; 152 led_dat->new_brightness = LED_OFF; 153 154 INIT_WORK(&led_dat->work, adp5520_led_work); 155 156 ret = led_classdev_register(led_dat->master, &led_dat->cdev); 157 if (ret) { 158 dev_err(&pdev->dev, "failed to register LED %d\n", 159 led_dat->id); 160 goto err; 161 } 162 163 ret = adp5520_led_setup(led_dat); 164 if (ret) { 165 dev_err(&pdev->dev, "failed to write\n"); 166 i++; 167 goto err; 168 } 169 } 170 171 platform_set_drvdata(pdev, led); 172 return 0; 173 174err: 175 if (i > 0) { 176 for (i = i - 1; i >= 0; i--) { 177 led_classdev_unregister(&led[i].cdev); 178 cancel_work_sync(&led[i].work); 179 } 180 } 181 182err_free: 183 kfree(led); 184 return ret; 185} 186 187static int __devexit adp5520_led_remove(struct platform_device *pdev) 188{ 189 struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data; 190 struct adp5520_led *led; 191 int i; 192 193 led = platform_get_drvdata(pdev); 194 195 adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, 196 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); 197 198 for (i = 0; i < pdata->num_leds; i++) { 199 led_classdev_unregister(&led[i].cdev); 200 cancel_work_sync(&led[i].work); 201 } 202 203 kfree(led); 204 return 0; 205} 206 207static struct platform_driver adp5520_led_driver = { 208 .driver = { 209 .name = "adp5520-led", 210 .owner = THIS_MODULE, 211 }, 212 .probe = adp5520_led_probe, 213 .remove = __devexit_p(adp5520_led_remove), 214}; 215 216static int __init adp5520_led_init(void) 217{ 218 return platform_driver_register(&adp5520_led_driver); 219} 220module_init(adp5520_led_init); 221 222static void __exit adp5520_led_exit(void) 223{ 224 platform_driver_unregister(&adp5520_led_driver); 225} 226module_exit(adp5520_led_exit); 227 228MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 229MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); 230MODULE_LICENSE("GPL"); 231MODULE_ALIAS("platform:adp5520-led"); 232