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Linux/drivers/leds/leds-lp8788.c

  1 /*
  2  * TI LP8788 MFD - keyled driver
  3  *
  4  * Copyright 2012 Texas Instruments
  5  *
  6  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/slab.h>
 16 #include <linux/err.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/leds.h>
 19 #include <linux/mutex.h>
 20 #include <linux/mfd/lp8788.h>
 21 #include <linux/mfd/lp8788-isink.h>
 22 
 23 #define MAX_BRIGHTNESS                  LP8788_ISINK_MAX_PWM
 24 #define DEFAULT_LED_NAME                "keyboard-backlight"
 25 
 26 struct lp8788_led {
 27         struct lp8788 *lp;
 28         struct mutex lock;
 29         struct led_classdev led_dev;
 30         enum lp8788_isink_number isink_num;
 31         int on;
 32 };
 33 
 34 struct lp8788_led_config {
 35         enum lp8788_isink_scale scale;
 36         enum lp8788_isink_number num;
 37         int iout;
 38 };
 39 
 40 static struct lp8788_led_config default_led_config = {
 41         .scale = LP8788_ISINK_SCALE_100mA,
 42         .num   = LP8788_ISINK_3,
 43         .iout  = 0,
 44 };
 45 
 46 static int lp8788_led_init_device(struct lp8788_led *led,
 47                                 struct lp8788_led_platform_data *pdata)
 48 {
 49         struct lp8788_led_config *cfg = &default_led_config;
 50         u8 addr, mask, val;
 51         int ret;
 52 
 53         if (pdata) {
 54                 cfg->scale = pdata->scale;
 55                 cfg->num = pdata->num;
 56                 cfg->iout = pdata->iout_code;
 57         }
 58 
 59         led->isink_num = cfg->num;
 60 
 61         /* scale configuration */
 62         addr = LP8788_ISINK_CTRL;
 63         mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
 64         val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
 65         ret = lp8788_update_bits(led->lp, addr, mask, val);
 66         if (ret)
 67                 return ret;
 68 
 69         /* current configuration */
 70         addr = lp8788_iout_addr[cfg->num];
 71         mask = lp8788_iout_mask[cfg->num];
 72         val = cfg->iout;
 73 
 74         return lp8788_update_bits(led->lp, addr, mask, val);
 75 }
 76 
 77 static int lp8788_led_enable(struct lp8788_led *led,
 78                         enum lp8788_isink_number num, int on)
 79 {
 80         int ret;
 81 
 82         u8 mask = 1 << num;
 83         u8 val = on << num;
 84 
 85         ret = lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val);
 86         if (ret == 0)
 87                 led->on = on;
 88 
 89         return ret;
 90 }
 91 
 92 static int lp8788_brightness_set(struct led_classdev *led_cdev,
 93                                 enum led_brightness val)
 94 {
 95         struct lp8788_led *led =
 96                         container_of(led_cdev, struct lp8788_led, led_dev);
 97 
 98         enum lp8788_isink_number num = led->isink_num;
 99         int enable, ret;
100 
101         mutex_lock(&led->lock);
102 
103         switch (num) {
104         case LP8788_ISINK_1:
105         case LP8788_ISINK_2:
106         case LP8788_ISINK_3:
107                 ret = lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
108                 if (ret < 0)
109                         goto unlock;
110                 break;
111         default:
112                 mutex_unlock(&led->lock);
113                 return -EINVAL;
114         }
115 
116         enable = (val > 0) ? 1 : 0;
117         if (enable != led->on)
118                 ret = lp8788_led_enable(led, num, enable);
119 unlock:
120         mutex_unlock(&led->lock);
121         return ret;
122 }
123 
124 static int lp8788_led_probe(struct platform_device *pdev)
125 {
126         struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
127         struct lp8788_led_platform_data *led_pdata;
128         struct lp8788_led *led;
129         struct device *dev = &pdev->dev;
130         int ret;
131 
132         led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL);
133         if (!led)
134                 return -ENOMEM;
135 
136         led->lp = lp;
137         led->led_dev.max_brightness = MAX_BRIGHTNESS;
138         led->led_dev.brightness_set_blocking = lp8788_brightness_set;
139 
140         led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
141 
142         if (!led_pdata || !led_pdata->name)
143                 led->led_dev.name = DEFAULT_LED_NAME;
144         else
145                 led->led_dev.name = led_pdata->name;
146 
147         mutex_init(&led->lock);
148 
149         ret = lp8788_led_init_device(led, led_pdata);
150         if (ret) {
151                 dev_err(dev, "led init device err: %d\n", ret);
152                 return ret;
153         }
154 
155         ret = devm_led_classdev_register(dev, &led->led_dev);
156         if (ret) {
157                 dev_err(dev, "led register err: %d\n", ret);
158                 return ret;
159         }
160 
161         return 0;
162 }
163 
164 static struct platform_driver lp8788_led_driver = {
165         .probe = lp8788_led_probe,
166         .driver = {
167                 .name = LP8788_DEV_KEYLED,
168         },
169 };
170 module_platform_driver(lp8788_led_driver);
171 
172 MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
173 MODULE_AUTHOR("Milo Kim");
174 MODULE_LICENSE("GPL");
175 MODULE_ALIAS("platform:lp8788-keyled");
176 

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