1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs 4 * 5 * Copyright 2009 Analog Devices Inc. 6 * 7 * Loosely derived from leds-da903x: 8 * Copyright (C) 2008 Compulab, Ltd. 9 * Mike Rapoport <mike@compulab.co.il> 10 * 11 * Copyright (C) 2006-2008 Marvell International Ltd. 12 * Eric Miao <eric.miao@marvell.com> 13 */ 14 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/platform_device.h> 18 #include <linux/leds.h> 19 #include <linux/mfd/adp5520.h> 20 #include <linux/slab.h> 21 22 struct adp5520_led { 23 struct led_classdev cdev; 24 struct device *master; 25 int id; 26 int flags; 27 }; 28 29 static int adp5520_led_set(struct led_classdev *led_cdev, 30 enum led_brightness value) 31 { 32 struct adp5520_led *led; 33 34 led = container_of(led_cdev, struct adp5520_led, cdev); 35 return adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1, 36 value >> 2); 37 } 38 39 static int adp5520_led_setup(struct adp5520_led *led) 40 { 41 struct device *dev = led->master; 42 int flags = led->flags; 43 int ret = 0; 44 45 switch (led->id) { 46 case FLAG_ID_ADP5520_LED1_ADP5501_LED0: 47 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 48 (flags >> ADP5520_FLAG_OFFT_SHIFT) & 49 ADP5520_FLAG_OFFT_MASK); 50 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 51 ADP5520_LED1_EN); 52 break; 53 case FLAG_ID_ADP5520_LED2_ADP5501_LED1: 54 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 55 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 56 ADP5520_FLAG_OFFT_MASK) << 2); 57 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 58 ADP5520_R3_MODE); 59 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 60 ADP5520_LED2_EN); 61 break; 62 case FLAG_ID_ADP5520_LED3_ADP5501_LED2: 63 ret |= adp5520_set_bits(dev, ADP5520_LED_TIME, 64 ((flags >> ADP5520_FLAG_OFFT_SHIFT) & 65 ADP5520_FLAG_OFFT_MASK) << 4); 66 ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL, 67 ADP5520_C3_MODE); 68 ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL, 69 ADP5520_LED3_EN); 70 break; 71 } 72 73 return ret; 74 } 75 76 static int adp5520_led_prepare(struct platform_device *pdev) 77 { 78 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 79 struct device *dev = pdev->dev.parent; 80 int ret = 0; 81 82 ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0); 83 ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0); 84 ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0); 85 ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6); 86 ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in, 87 pdata->fade_out)); 88 89 return ret; 90 } 91 92 static int adp5520_led_probe(struct platform_device *pdev) 93 { 94 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 95 struct adp5520_led *led, *led_dat; 96 struct led_info *cur_led; 97 int ret, i; 98 99 if (pdata == NULL) { 100 dev_err(&pdev->dev, "missing platform data\n"); 101 return -ENODEV; 102 } 103 104 if (pdata->num_leds > ADP5520_01_MAXLEDS) { 105 dev_err(&pdev->dev, "can't handle more than %d LEDS\n", 106 ADP5520_01_MAXLEDS); 107 return -EFAULT; 108 } 109 110 led = devm_kcalloc(&pdev->dev, pdata->num_leds, sizeof(*led), 111 GFP_KERNEL); 112 if (!led) 113 return -ENOMEM; 114 115 ret = adp5520_led_prepare(pdev); 116 if (ret) { 117 dev_err(&pdev->dev, "failed to write\n"); 118 return ret; 119 } 120 121 for (i = 0; i < pdata->num_leds; ++i) { 122 cur_led = &pdata->leds[i]; 123 led_dat = &led[i]; 124 125 led_dat->cdev.name = cur_led->name; 126 led_dat->cdev.default_trigger = cur_led->default_trigger; 127 led_dat->cdev.brightness_set_blocking = adp5520_led_set; 128 led_dat->cdev.brightness = LED_OFF; 129 130 if (cur_led->flags & ADP5520_FLAG_LED_MASK) 131 led_dat->flags = cur_led->flags; 132 else 133 led_dat->flags = i + 1; 134 135 led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK; 136 137 led_dat->master = pdev->dev.parent; 138 139 ret = led_classdev_register(led_dat->master, &led_dat->cdev); 140 if (ret) { 141 dev_err(&pdev->dev, "failed to register LED %d\n", 142 led_dat->id); 143 goto err; 144 } 145 146 ret = adp5520_led_setup(led_dat); 147 if (ret) { 148 dev_err(&pdev->dev, "failed to write\n"); 149 i++; 150 goto err; 151 } 152 } 153 154 platform_set_drvdata(pdev, led); 155 return 0; 156 157 err: 158 if (i > 0) { 159 for (i = i - 1; i >= 0; i--) 160 led_classdev_unregister(&led[i].cdev); 161 } 162 163 return ret; 164 } 165 166 static int adp5520_led_remove(struct platform_device *pdev) 167 { 168 struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); 169 struct adp5520_led *led; 170 int i; 171 172 led = platform_get_drvdata(pdev); 173 174 adp5520_clr_bits(led->master, ADP5520_LED_CONTROL, 175 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN); 176 177 for (i = 0; i < pdata->num_leds; i++) { 178 led_classdev_unregister(&led[i].cdev); 179 } 180 181 return 0; 182 } 183 184 static struct platform_driver adp5520_led_driver = { 185 .driver = { 186 .name = "adp5520-led", 187 }, 188 .probe = adp5520_led_probe, 189 .remove = adp5520_led_remove, 190 }; 191 192 module_platform_driver(adp5520_led_driver); 193 194 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 195 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver"); 196 MODULE_LICENSE("GPL"); 197 MODULE_ALIAS("platform:adp5520-led"); 198