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