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/mfd/da903x.h>
  20 #include <linux/slab.h>
  21
  22 #define DA9030_LED1_CONTROL     0x20
  23 #define DA9030_LED2_CONTROL     0x21
  24 #define DA9030_LED3_CONTROL     0x22
  25 #define DA9030_LED4_CONTROL     0x23
  26 #define DA9030_LEDPC_CONTROL    0x24
  27 #define DA9030_MISC_CONTROL_A   0x26    /* Vibrator Control */
  28
  29 #define DA9034_LED1_CONTROL     0x35
  30 #define DA9034_LED2_CONTROL     0x36
  31 #define DA9034_VIBRA            0x40
  32
  33 struct da903x_led {
  34         struct led_classdev     cdev;
  35         struct device           *master;
  36         int                     id;
  37         int                     flags;
  38 };
  39
  40 #define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
  41 #define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)
  42
  43 static int da903x_led_set(struct led_classdev *led_cdev,
  44                            enum led_brightness value)
  45 {
  46         struct da903x_led *led =
  47                         container_of(led_cdev, struct da903x_led, cdev);
  48         uint8_t val;
  49         int offset, ret = -EINVAL;
  50
  51         switch (led->id) {
  52         case DA9030_ID_LED_1:
  53         case DA9030_ID_LED_2:
  54         case DA9030_ID_LED_3:
  55         case DA9030_ID_LED_4:
  56         case DA9030_ID_LED_PC:
  57                 offset = DA9030_LED_OFFSET(led->id);
  58                 val = led->flags & ~0x87;
  59                 val |= value ? 0x80 : 0; /* EN bit */
  60                 val |= (0x7 - (value >> 5)) & 0x7; /* PWM<2:0> */
  61                 ret = da903x_write(led->master, DA9030_LED1_CONTROL + offset,
  62                                    val);
  63                 break;
  64         case DA9030_ID_VIBRA:
  65                 val = led->flags & ~0x80;
  66                 val |= value ? 0x80 : 0; /* EN bit */
  67                 ret = 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 = (value * 0x5f / LED_FULL) & 0x7f;
  73                 val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
  74                 ret = da903x_write(led->master, DA9034_LED1_CONTROL + offset,
  75                                    val);
  76                 break;
  77         case DA9034_ID_VIBRA:
  78                 val = value & 0xfe;
  79                 ret = da903x_write(led->master, DA9034_VIBRA, val);
  80                 break;
  81         }
  82
  83         return ret;
  84 }
  85
  86 static int da903x_led_probe(struct platform_device *pdev)
  87 {
  88         struct led_info *pdata = dev_get_platdata(&pdev->dev);
  89         struct da903x_led *led;
  90         int id, ret;
  91
  92         if (pdata == NULL)
  93                 return 0;
  94
  95         id = pdev->id;
  96
  97         if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
  98               (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
  99                 dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
 100                 return -EINVAL;
 101         }
 102
 103         led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
 104         if (!led)
 105                 return -ENOMEM;
 106
 107         led->cdev.name = pdata->name;
 108         led->cdev.default_trigger = pdata->default_trigger;
 109         led->cdev.brightness_set_blocking = da903x_led_set;
 110         led->cdev.brightness = LED_OFF;
 111
 112         led->id = id;
 113         led->flags = pdata->flags;
 114         led->master = pdev->dev.parent;
 115
 116         ret = devm_led_classdev_register(led->master, &led->cdev);
 117         if (ret) {
 118                 dev_err(&pdev->dev, "failed to register LED %d\n", id);
 119                 return ret;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static struct platform_driver da903x_led_driver = {
 126         .driver = {
 127                 .name   = "da903x-led",
 128         },
 129         .probe          = da903x_led_probe,
 130 };
 131
 132 module_platform_driver(da903x_led_driver);
 133
 134 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
 135 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 136 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 137 MODULE_LICENSE("GPL");
 138 MODULE_ALIAS("platform:da903x-led");