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 25 struct 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 34 static 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 41 static 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 51 static 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 88 static int 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 } 103 104 static int 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 = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds, 123 GFP_KERNEL); 124 if (led == NULL) { 125 dev_err(&pdev->dev, "failed to alloc memory\n"); 126 return -ENOMEM; 127 } 128 129 ret = adp5520_led_prepare(pdev); 130 131 if (ret) { 132 dev_err(&pdev->dev, "failed to write\n"); 133 return ret; 134 } 135 136 for (i = 0; i < pdata->num_leds; ++i) { 137 cur_led = &pdata->leds[i]; 138 led_dat = &led[i]; 139 140 led_dat->cdev.name = cur_led->name; 141 led_dat->cdev.default_trigger = cur_led->default_trigger; 142 led_dat->cdev.brightness_set = adp5520_led_set; 143 led_dat->cdev.brightness = LED_OFF; 144 145 if (cur_led->flags & ADP5520_FLAG_LED_MASK) 146 led_dat->flags = cur_led->flags; 147 else 148 led_dat->flags = i + 1; 149 150 led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK; 151 152 led_dat->master = pdev->dev.parent; 153 led_dat->new_brightness = LED_OFF; 154 155 INIT_WORK(&led_dat->work, adp5520_led_work); 156 157 ret = led_classdev_register(led_dat->master, &led_dat->cdev); 158 if (ret) { 159 dev_err(&pdev->dev, "failed to register LED %d\n", 160 led_dat->id); 161 goto err; 162 } 163 164 ret = adp5520_led_setup(led_dat); 165 if (ret) { 166 dev_err(&pdev->dev, "failed to write\n"); 167 i++; 168 goto err; 169 } 170 } 171 172 platform_set_drvdata(pdev, led); 173 return 0; 174 175 err: 176 if (i > 0) { 177 for (i = i - 1; i >= 0; i--) { 178 led_classdev_unregister(&led[i].cdev); 179 cancel_work_sync(&led[i].work); 180 } 181 } 182 183 return ret; 184 } 185 186 static int __devexit adp5520_led_remove(struct platform_device *pdev) 187 { 188 struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data; 189 struct adp5520_led *led; 190 int i; 191 192 led = platform_get_drvdata(pdev); 193 194 adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, 195 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); 196 197 for (i = 0; i < pdata->num_leds; i++) { 198 led_classdev_unregister(&led[i].cdev); 199 cancel_work_sync(&led[i].work); 200 } 201 202 return 0; 203 } 204 205 static struct platform_driver adp5520_led_driver = { 206 .driver = { 207 .name = "adp5520-led", 208 .owner = THIS_MODULE, 209 }, 210 .probe = adp5520_led_probe, 211 .remove = adp5520_led_remove, 212 }; 213 214 module_platform_driver(adp5520_led_driver); 215 216 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 217 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); 218 MODULE_LICENSE("GPL"); 219 MODULE_ALIAS("platform:adp5520-led"); 220