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/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         },
 205         .probe          = adp5520_led_probe,
 206         .remove         = adp5520_led_remove,
 207 };
 208
 209 module_platform_driver(adp5520_led_driver);
 210
 211 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 212 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
 213 MODULE_LICENSE("GPL");
 214 MODULE_ALIAS("platform:adp5520-led");