drivers/leds/leds-adp5520.c

   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 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");