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Linux/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 == NULL) {
124                 dev_err(&pdev->dev, "failed to alloc memory\n");
125                 return -ENOMEM;
126         }
127 
128         ret = adp5520_led_prepare(pdev);
129 
130         if (ret) {
131                 dev_err(&pdev->dev, "failed to write\n");
132                 return ret;
133         }
134 
135         for (i = 0; i < pdata->num_leds; ++i) {
136                 cur_led = &pdata->leds[i];
137                 led_dat = &led[i];
138 
139                 led_dat->cdev.name = cur_led->name;
140                 led_dat->cdev.default_trigger = cur_led->default_trigger;
141                 led_dat->cdev.brightness_set = adp5520_led_set;
142                 led_dat->cdev.brightness = LED_OFF;
143 
144                 if (cur_led->flags & ADP5520_FLAG_LED_MASK)
145                         led_dat->flags = cur_led->flags;
146                 else
147                         led_dat->flags = i + 1;
148 
149                 led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
150 
151                 led_dat->master = pdev->dev.parent;
152                 led_dat->new_brightness = LED_OFF;
153 
154                 INIT_WORK(&led_dat->work, adp5520_led_work);
155 
156                 ret = led_classdev_register(led_dat->master, &led_dat->cdev);
157                 if (ret) {
158                         dev_err(&pdev->dev, "failed to register LED %d\n",
159                                 led_dat->id);
160                         goto err;
161                 }
162 
163                 ret = adp5520_led_setup(led_dat);
164                 if (ret) {
165                         dev_err(&pdev->dev, "failed to write\n");
166                         i++;
167                         goto err;
168                 }
169         }
170 
171         platform_set_drvdata(pdev, led);
172         return 0;
173 
174 err:
175         if (i > 0) {
176                 for (i = i - 1; i >= 0; i--) {
177                         led_classdev_unregister(&led[i].cdev);
178                         cancel_work_sync(&led[i].work);
179                 }
180         }
181 
182         return ret;
183 }
184 
185 static int adp5520_led_remove(struct platform_device *pdev)
186 {
187         struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
188         struct adp5520_led *led;
189         int i;
190 
191         led = platform_get_drvdata(pdev);
192 
193         adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
194                  ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
195 
196         for (i = 0; i < pdata->num_leds; i++) {
197                 led_classdev_unregister(&led[i].cdev);
198                 cancel_work_sync(&led[i].work);
199         }
200 
201         return 0;
202 }
203 
204 static struct platform_driver adp5520_led_driver = {
205         .driver = {
206                 .name   = "adp5520-led",
207                 .owner  = THIS_MODULE,
208         },
209         .probe          = adp5520_led_probe,
210         .remove         = adp5520_led_remove,
211 };
212 
213 module_platform_driver(adp5520_led_driver);
214 
215 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
216 MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
217 MODULE_LICENSE("GPL");
218 MODULE_ALIAS("platform:adp5520-led");
219 

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