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/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_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
 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");