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/platform_device.h> 19 #include <linux/leds.h> 20 #include <linux/workqueue.h> 21 #include <linux/mfd/adp5520.h> 22 #include <linux/slab.h> 23 24 struct adp5520_led { 25 struct led_classdev cdev; 26 struct work_struct work; 27 struct device *master; 28 enum led_brightness new_brightness; 29 int id; 30 int flags; 31 }; 32 33 static void adp5520_led_work(struct work_struct *work) 34 { 35 struct adp5520_led *led = container_of(work, struct adp5520_led, work); 36 adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1, 37 led->new_brightness >> 2); 38 } 39 40 static void adp5520_led_set(struct led_classdev *led_cdev, 41 enum led_brightness value) 42 { 43 struct adp5520_led *led; 44 45 led = container_of(led_cdev, struct adp5520_led, cdev); 46 led->new_brightness = value; 47 schedule_work(&led->work); 48 } 49 50 static int adp5520_led_setup(struct adp5520_led *led) 51 { 52 struct device *dev = led->master; 53 int flags = led->flags; 54 int ret = 0; 55 56 switch (led->id) { 57 case FLAG_ID_ADP5520_LED1_ADP5501_LED0: 58 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 59 (flags >> ADP5520_FLAG_OFFT_SHIFT) & 60 ADP5520_FLAG_OFFT_MASK); 61 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 62 ADP5520_LED1_EN); 63 break; 64 case FLAG_ID_ADP5520_LED2_ADP5501_LED1: 65 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 66 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 67 ADP5520_FLAG_OFFT_MASK) << 2); 68 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 69 ADP5520_R3_MODE); 70 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 71 ADP5520_LED2_EN); 72 break; 73 case FLAG_ID_ADP5520_LED3_ADP5501_LED2: 74 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 75 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 76 ADP5520_FLAG_OFFT_MASK) << 4); 77 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 78 ADP5520_C3_MODE); 79 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 80 ADP5520_LED3_EN); 81 break; 82 } 83 84 return ret; 85 } 86 87 static int adp5520_led_prepare(struct platform_device *pdev) 88 { 89 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 90 struct device *dev = pdev->dev.parent; 91 int ret = 0; 92 93 ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0); 94 ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0); 95 ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0); 96 ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6); 97 ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in, 98 pdata->fade_out)); 99 100 return ret; 101 } 102 103 static int adp5520_led_probe(struct platform_device *pdev) 104 { 105 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 106 struct adp5520_led *led, *led_dat; 107 struct led_info *cur_led; 108 int ret, i; 109 110 if (pdata == NULL) { 111 dev_err(&pdev->dev, "missing platform data\n"); 112 return -ENODEV; 113 } 114 115 if (pdata->num_leds > ADP5520_01_MAXLEDS) { 116 dev_err(&pdev->dev, "can't handle more than %d LEDS\n", 117 ADP5520_01_MAXLEDS); 118 return -EFAULT; 119 } 120 121 led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds, 122 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 return ret; 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; 173 174 err: 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 } 181 182 return ret; 183 } 184 185 static int adp5520_led_remove(struct platform_device *pdev) 186 { 187 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 188 struct adp5520_led *led; 189 int i; 190 191 led = platform_get_drvdata(pdev); 192 193 adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, 194 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); 195 196 for (i = 0; i < pdata->num_leds; i++) { 197 led_classdev_unregister(&led[i].cdev); 198 cancel_work_sync(&led[i].work); 199 } 200 201 return 0; 202 } 203 204 static struct platform_driver adp5520_led_driver = { 205 .driver = { 206 .name = "adp5520-led", 207 .owner = THIS_MODULE, 208 }, 209 .probe = adp5520_led_probe, 210 .remove = adp5520_led_remove, 211 }; 212 213 module_platform_driver(adp5520_led_driver); 214 215 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 216 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); 217 MODULE_LICENSE("GPL"); 218 MODULE_ALIAS("platform:adp5520-led"); 219