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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/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");
199 

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