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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/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 = dev_get_platdata(&pdev->dev);
 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 = dev_get_platdata(&pdev->dev);
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 = dev_get_platdata(&pdev->dev);
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");
220 

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