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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/init.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/leds.h>
 20 #include <linux/workqueue.h>
 21 #include <linux/mfd/da903x.h>
 22 #include <linux/slab.h>
 23 
 24 #define DA9030_LED1_CONTROL     0x20
 25 #define DA9030_LED2_CONTROL     0x21
 26 #define DA9030_LED3_CONTROL     0x22
 27 #define DA9030_LED4_CONTROL     0x23
 28 #define DA9030_LEDPC_CONTROL    0x24
 29 #define DA9030_MISC_CONTROL_A   0x26    /* Vibrator Control */
 30 
 31 #define DA9034_LED1_CONTROL     0x35
 32 #define DA9034_LED2_CONTROL     0x36
 33 #define DA9034_VIBRA            0x40
 34 
 35 struct da903x_led {
 36         struct led_classdev     cdev;
 37         struct work_struct      work;
 38         struct device           *master;
 39         enum led_brightness     new_brightness;
 40         int                     id;
 41         int                     flags;
 42 };
 43 
 44 #define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
 45 #define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)
 46 
 47 static void da903x_led_work(struct work_struct *work)
 48 {
 49         struct da903x_led *led = container_of(work, struct da903x_led, work);
 50         uint8_t val;
 51         int offset;
 52 
 53         switch (led->id) {
 54         case DA9030_ID_LED_1:
 55         case DA9030_ID_LED_2:
 56         case DA9030_ID_LED_3:
 57         case DA9030_ID_LED_4:
 58         case DA9030_ID_LED_PC:
 59                 offset = DA9030_LED_OFFSET(led->id);
 60                 val = led->flags & ~0x87;
 61                 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
 62                 val |= (0x7 - (led->new_brightness >> 5)) & 0x7; /* PWM<2:0> */
 63                 da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
 64                 break;
 65         case DA9030_ID_VIBRA:
 66                 val = led->flags & ~0x80;
 67                 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
 68                 da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
 69                 break;
 70         case DA9034_ID_LED_1:
 71         case DA9034_ID_LED_2:
 72                 offset = DA9034_LED_OFFSET(led->id);
 73                 val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
 74                 val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
 75                 da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
 76                 break;
 77         case DA9034_ID_VIBRA:
 78                 val = led->new_brightness & 0xfe;
 79                 da903x_write(led->master, DA9034_VIBRA, val);
 80                 break;
 81         }
 82 }
 83 
 84 static void da903x_led_set(struct led_classdev *led_cdev,
 85                            enum led_brightness value)
 86 {
 87         struct da903x_led *led;
 88 
 89         led = container_of(led_cdev, struct da903x_led, cdev);
 90         led->new_brightness = value;
 91         schedule_work(&led->work);
 92 }
 93 
 94 static int da903x_led_probe(struct platform_device *pdev)
 95 {
 96         struct led_info *pdata = dev_get_platdata(&pdev->dev);
 97         struct da903x_led *led;
 98         int id, ret;
 99 
100         if (pdata == NULL)
101                 return 0;
102 
103         id = pdev->id;
104 
105         if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
106               (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
107                 dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
108                 return -EINVAL;
109         }
110 
111         led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
112         if (led == NULL) {
113                 dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
114                 return -ENOMEM;
115         }
116 
117         led->cdev.name = pdata->name;
118         led->cdev.default_trigger = pdata->default_trigger;
119         led->cdev.brightness_set = da903x_led_set;
120         led->cdev.brightness = LED_OFF;
121 
122         led->id = id;
123         led->flags = pdata->flags;
124         led->master = pdev->dev.parent;
125         led->new_brightness = LED_OFF;
126 
127         INIT_WORK(&led->work, da903x_led_work);
128 
129         ret = led_classdev_register(led->master, &led->cdev);
130         if (ret) {
131                 dev_err(&pdev->dev, "failed to register LED %d\n", id);
132                 return ret;
133         }
134 
135         platform_set_drvdata(pdev, led);
136         return 0;
137 }
138 
139 static int da903x_led_remove(struct platform_device *pdev)
140 {
141         struct da903x_led *led = platform_get_drvdata(pdev);
142 
143         led_classdev_unregister(&led->cdev);
144         return 0;
145 }
146 
147 static struct platform_driver da903x_led_driver = {
148         .driver = {
149                 .name   = "da903x-led",
150                 .owner  = THIS_MODULE,
151         },
152         .probe          = da903x_led_probe,
153         .remove         = da903x_led_remove,
154 };
155 
156 module_platform_driver(da903x_led_driver);
157 
158 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
159 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
160 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
161 MODULE_LICENSE("GPL");
162 MODULE_ALIAS("platform:da903x-led");
163 

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