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/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/leds.h>
  20 #include <linux/mfd/da903x.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 work_struct      work;
  36         struct device           *master;
  37         enum led_brightness     new_brightness;
  38         int                     id;
  39         int                     flags;
  40 };
  41
  42 #define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
  43 #define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)
  44
  45 static void da903x_led_work(struct work_struct *work)
  46 {
  47         struct da903x_led *led = container_of(work, struct da903x_led, work);
  48         uint8_t val;
  49         int offset;
  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 |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
  60                 val |= (led->new_brightness >> 5) & 0x7; /* PWM<2:0> */
  61                 da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
  62                 break;
  63         case DA9030_ID_VIBRA:
  64                 val = led->flags & ~0x80;
  65                 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
  66                 da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
  67                 break;
  68         case DA9034_ID_LED_1:
  69         case DA9034_ID_LED_2:
  70                 offset = DA9034_LED_OFFSET(led->id);
  71                 val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
  72                 val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
  73                 da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
  74                 break;
  75         case DA9034_ID_VIBRA:
  76                 val = led->new_brightness & 0xfe;
  77                 da903x_write(led->master, DA9034_VIBRA, val);
  78                 break;
  79         }
  80 }
  81
  82 static void da903x_led_set(struct led_classdev *led_cdev,
  83                            enum led_brightness value)
  84 {
  85         struct da903x_led *led;
  86
  87         led = container_of(led_cdev, struct da903x_led, cdev);
  88         led->new_brightness = value;
  89         schedule_work(&led->work);
  90 }
  91
  92 static int __devinit da903x_led_probe(struct platform_device *pdev)
  93 {
  94         struct led_info *pdata = pdev->dev.platform_data;
  95         struct da903x_led *led;
  96         int id, ret;
  97
  98         if (pdata == NULL)
  99                 return 0;
 100
 101         id = pdev->id;
 102
 103         if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
 104               (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
 105                 dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
 106                 return -EINVAL;
 107         }
 108
 109         led = kzalloc(sizeof(struct da903x_led), GFP_KERNEL);
 110         if (led == NULL) {
 111                 dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
 112                 return -ENOMEM;
 113         }
 114
 115         led->cdev.name = pdata->name;
 116         led->cdev.default_trigger = pdata->default_trigger;
 117         led->cdev.brightness_set = da903x_led_set;
 118         led->cdev.brightness = LED_OFF;
 119
 120         led->id = id;
 121         led->flags = pdata->flags;
 122         led->master = pdev->dev.parent;
 123         led->new_brightness = LED_OFF;
 124
 125         INIT_WORK(&led->work, da903x_led_work);
 126
 127         ret = led_classdev_register(led->master, &led->cdev);
 128         if (ret) {
 129                 dev_err(&pdev->dev, "failed to register LED %d\n", id);
 130                 goto err;
 131         }
 132
 133         platform_set_drvdata(pdev, led);
 134         return 0;
 135
 136 err:
 137         kfree(led);
 138         return ret;
 139 }
 140
 141 static int __devexit da903x_led_remove(struct platform_device *pdev)
 142 {
 143         struct da903x_led *led = platform_get_drvdata(pdev);
 144
 145         led_classdev_unregister(&led->cdev);
 146         kfree(led);
 147         return 0;
 148 }
 149
 150 static struct platform_driver da903x_led_driver = {
 151         .driver = {
 152                 .name   = "da903x-led",
 153                 .owner  = THIS_MODULE,
 154         },
 155         .probe          = da903x_led_probe,
 156         .remove         = __devexit_p(da903x_led_remove),
 157 };
 158
 159 static int __init da903x_led_init(void)
 160 {
 161         return platform_driver_register(&da903x_led_driver);
 162 }
 163 module_init(da903x_led_init);
 164
 165 static void __exit da903x_led_exit(void)
 166 {
 167         platform_driver_unregister(&da903x_led_driver);
 168 }
 169 module_exit(da903x_led_exit);
 170
 171 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
 172 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
 173               "Mike Rapoport <mike@compulab.co.il>");
 174 MODULE_LICENSE("GPL");
 175 MODULE_ALIAS("platform:da903x-led");