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Linux/drivers/leds/leds-da903x.c

  1 /*
  2  * LEDs driver for Dialog Semiconductor DA9030/DA9034
  3  *
  4  * Copyright (C) 2008 Compulab, Ltd.
  5  *      Mike Rapoport <mike@compulab.co.il>
  6  *
  7  * Copyright (C) 2006-2008 Marvell International Ltd.
  8  *      Eric Miao <eric.miao@marvell.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/kernel.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/leds.h>
 19 #include <linux/workqueue.h>
 20 #include <linux/mfd/da903x.h>
 21 #include <linux/slab.h>
 22 
 23 #define DA9030_LED1_CONTROL     0x20
 24 #define DA9030_LED2_CONTROL     0x21
 25 #define DA9030_LED3_CONTROL     0x22
 26 #define DA9030_LED4_CONTROL     0x23
 27 #define DA9030_LEDPC_CONTROL    0x24
 28 #define DA9030_MISC_CONTROL_A   0x26    /* Vibrator Control */
 29 
 30 #define DA9034_LED1_CONTROL     0x35
 31 #define DA9034_LED2_CONTROL     0x36
 32 #define DA9034_VIBRA            0x40
 33 
 34 struct da903x_led {
 35         struct led_classdev     cdev;
 36         struct work_struct      work;
 37         struct device           *master;
 38         enum led_brightness     new_brightness;
 39         int                     id;
 40         int                     flags;
 41 };
 42 
 43 #define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
 44 #define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)
 45 
 46 static void da903x_led_work(struct work_struct *work)
 47 {
 48         struct da903x_led *led = container_of(work, struct da903x_led, work);
 49         uint8_t val;
 50         int offset;
 51 
 52         switch (led->id) {
 53         case DA9030_ID_LED_1:
 54         case DA9030_ID_LED_2:
 55         case DA9030_ID_LED_3:
 56         case DA9030_ID_LED_4:
 57         case DA9030_ID_LED_PC:
 58                 offset = DA9030_LED_OFFSET(led->id);
 59                 val = led->flags & ~0x87;
 60                 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
 61                 val |= (0x7 - (led->new_brightness >> 5)) & 0x7; /* PWM<2:0> */
 62                 da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
 63                 break;
 64         case DA9030_ID_VIBRA:
 65                 val = led->flags & ~0x80;
 66                 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
 67                 da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
 68                 break;
 69         case DA9034_ID_LED_1:
 70         case DA9034_ID_LED_2:
 71                 offset = DA9034_LED_OFFSET(led->id);
 72                 val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
 73                 val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
 74                 da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
 75                 break;
 76         case DA9034_ID_VIBRA:
 77                 val = led->new_brightness & 0xfe;
 78                 da903x_write(led->master, DA9034_VIBRA, val);
 79                 break;
 80         }
 81 }
 82 
 83 static void da903x_led_set(struct led_classdev *led_cdev,
 84                            enum led_brightness value)
 85 {
 86         struct da903x_led *led;
 87 
 88         led = container_of(led_cdev, struct da903x_led, cdev);
 89         led->new_brightness = value;
 90         schedule_work(&led->work);
 91 }
 92 
 93 static int da903x_led_probe(struct platform_device *pdev)
 94 {
 95         struct led_info *pdata = dev_get_platdata(&pdev->dev);
 96         struct da903x_led *led;
 97         int id, ret;
 98 
 99         if (pdata == NULL)
100                 return 0;
101 
102         id = pdev->id;
103 
104         if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
105               (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
106                 dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
107                 return -EINVAL;
108         }
109 
110         led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
111         if (!led)
112                 return -ENOMEM;
113 
114         led->cdev.name = pdata->name;
115         led->cdev.default_trigger = pdata->default_trigger;
116         led->cdev.brightness_set = da903x_led_set;
117         led->cdev.brightness = LED_OFF;
118 
119         led->id = id;
120         led->flags = pdata->flags;
121         led->master = pdev->dev.parent;
122         led->new_brightness = LED_OFF;
123 
124         INIT_WORK(&led->work, da903x_led_work);
125 
126         ret = led_classdev_register(led->master, &led->cdev);
127         if (ret) {
128                 dev_err(&pdev->dev, "failed to register LED %d\n", id);
129                 return ret;
130         }
131 
132         platform_set_drvdata(pdev, led);
133         return 0;
134 }
135 
136 static int da903x_led_remove(struct platform_device *pdev)
137 {
138         struct da903x_led *led = platform_get_drvdata(pdev);
139 
140         led_classdev_unregister(&led->cdev);
141         return 0;
142 }
143 
144 static struct platform_driver da903x_led_driver = {
145         .driver = {
146                 .name   = "da903x-led",
147                 .owner  = THIS_MODULE,
148         },
149         .probe          = da903x_led_probe,
150         .remove         = da903x_led_remove,
151 };
152 
153 module_platform_driver(da903x_led_driver);
154 
155 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
156 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
157 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
158 MODULE_LICENSE("GPL");
159 MODULE_ALIAS("platform:da903x-led");
160 

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