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/mfd/adp5520.h> 21 #include <linux/slab.h> 22 23 struct adp5520_led { 24 struct led_classdev cdev; 25 struct device *master; 26 int id; 27 int flags; 28 }; 29 30 static int adp5520_led_set(struct led_classdev *led_cdev, 31 enum led_brightness value) 32 { 33 struct adp5520_led *led; 34 35 led = container_of(led_cdev, struct adp5520_led, cdev); 36 return adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1, 37 value >> 2); 38 } 39 40 static int adp5520_led_setup(struct adp5520_led *led) 41 { 42 struct device *dev = led->master; 43 int flags = led->flags; 44 int ret = 0; 45 46 switch (led->id) { 47 case FLAG_ID_ADP5520_LED1_ADP5501_LED0: 48 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 49 (flags >> ADP5520_FLAG_OFFT_SHIFT) & 50 ADP5520_FLAG_OFFT_MASK); 51 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 52 ADP5520_LED1_EN); 53 break; 54 case FLAG_ID_ADP5520_LED2_ADP5501_LED1: 55 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 56 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 57 ADP5520_FLAG_OFFT_MASK) << 2); 58 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 59 ADP5520_R3_MODE); 60 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 61 ADP5520_LED2_EN); 62 break; 63 case FLAG_ID_ADP5520_LED3_ADP5501_LED2: 64 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 65 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 66 ADP5520_FLAG_OFFT_MASK) << 4); 67 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 68 ADP5520_C3_MODE); 69 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 70 ADP5520_LED3_EN); 71 break; 72 } 73 74 return ret; 75 } 76 77 static int adp5520_led_prepare(struct platform_device *pdev) 78 { 79 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 80 struct device *dev = pdev->dev.parent; 81 int ret = 0; 82 83 ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0); 84 ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0); 85 ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0); 86 ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6); 87 ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in, 88 pdata->fade_out)); 89 90 return ret; 91 } 92 93 static int adp5520_led_probe(struct platform_device *pdev) 94 { 95 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 96 struct adp5520_led *led, *led_dat; 97 struct led_info *cur_led; 98 int ret, i; 99 100 if (pdata == NULL) { 101 dev_err(&pdev->dev, "missing platform data\n"); 102 return -ENODEV; 103 } 104 105 if (pdata->num_leds > ADP5520_01_MAXLEDS) { 106 dev_err(&pdev->dev, "can't handle more than %d LEDS\n", 107 ADP5520_01_MAXLEDS); 108 return -EFAULT; 109 } 110 111 led = devm_kcalloc(&pdev->dev, pdata->num_leds, sizeof(*led), 112 GFP_KERNEL); 113 if (!led) 114 return -ENOMEM; 115 116 ret = adp5520_led_prepare(pdev); 117 if (ret) { 118 dev_err(&pdev->dev, "failed to write\n"); 119 return ret; 120 } 121 122 for (i = 0; i < pdata->num_leds; ++i) { 123 cur_led = &pdata->leds[i]; 124 led_dat = &led[i]; 125 126 led_dat->cdev.name = cur_led->name; 127 led_dat->cdev.default_trigger = cur_led->default_trigger; 128 led_dat->cdev.brightness_set_blocking = adp5520_led_set; 129 led_dat->cdev.brightness = LED_OFF; 130 131 if (cur_led->flags & ADP5520_FLAG_LED_MASK) 132 led_dat->flags = cur_led->flags; 133 else 134 led_dat->flags = i + 1; 135 136 led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK; 137 138 led_dat->master = pdev->dev.parent; 139 140 ret = led_classdev_register(led_dat->master, &led_dat->cdev); 141 if (ret) { 142 dev_err(&pdev->dev, "failed to register LED %d\n", 143 led_dat->id); 144 goto err; 145 } 146 147 ret = adp5520_led_setup(led_dat); 148 if (ret) { 149 dev_err(&pdev->dev, "failed to write\n"); 150 i++; 151 goto err; 152 } 153 } 154 155 platform_set_drvdata(pdev, led); 156 return 0; 157 158 err: 159 if (i > 0) { 160 for (i = i - 1; i >= 0; i--) 161 led_classdev_unregister(&led[i].cdev); 162 } 163 164 return ret; 165 } 166 167 static int adp5520_led_remove(struct platform_device *pdev) 168 { 169 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 170 struct adp5520_led *led; 171 int i; 172 173 led = platform_get_drvdata(pdev); 174 175 adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, 176 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); 177 178 for (i = 0; i < pdata->num_leds; i++) { 179 led_classdev_unregister(&led[i].cdev); 180 } 181 182 return 0; 183 } 184 185 static struct platform_driver adp5520_led_driver = { 186 .driver = { 187 .name = "adp5520-led", 188 }, 189 .probe = adp5520_led_probe, 190 .remove = adp5520_led_remove, 191 }; 192 193 module_platform_driver(adp5520_led_driver); 194 195 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 196 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); 197 MODULE_LICENSE("GPL"); 198 MODULE_ALIAS("platform:adp5520-led"); 199