leds: lm355x: rename devAttr to avoid CamelCase
[linux-3.10.git] / drivers / leds / leds-da9052.c
1 /*
2  * LED Driver for Dialog DA9052 PMICs.
3  *
4  * Copyright(c) 2012 Dialog Semiconductor Ltd.
5  *
6  * Author: David Dajun Chen <dchen@diasemi.com>
7  *
8  *  This program is free software; you can redistribute  it and/or modify it
9  *  under  the terms of  the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the  License, or (at your
11  *  option) any later version.
12  *
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/slab.h>
22
23 #include <linux/mfd/da9052/reg.h>
24 #include <linux/mfd/da9052/da9052.h>
25 #include <linux/mfd/da9052/pdata.h>
26
27 #define DA9052_OPENDRAIN_OUTPUT 2
28 #define DA9052_SET_HIGH_LVL_OUTPUT      (1 << 3)
29 #define DA9052_MASK_UPPER_NIBBLE        0xF0
30 #define DA9052_MASK_LOWER_NIBBLE        0x0F
31 #define DA9052_NIBBLE_SHIFT             4
32 #define DA9052_MAX_BRIGHTNESS           0x5f
33
34 struct da9052_led {
35         struct led_classdev cdev;
36         struct work_struct work;
37         struct da9052 *da9052;
38         unsigned char led_index;
39         unsigned char id;
40         int brightness;
41 };
42
43 static unsigned char led_reg[] = {
44         DA9052_LED_CONT_4_REG,
45         DA9052_LED_CONT_5_REG,
46 };
47
48 static int da9052_set_led_brightness(struct da9052_led *led)
49 {
50         u8 val;
51         int error;
52
53         val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;
54
55         error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
56         if (error < 0)
57                 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
58                         error);
59         return error;
60 }
61
62 static void da9052_led_work(struct work_struct *work)
63 {
64         struct da9052_led *led = container_of(work, struct da9052_led, work);
65
66         da9052_set_led_brightness(led);
67 }
68
69 static void da9052_led_set(struct led_classdev *led_cdev,
70                            enum led_brightness value)
71 {
72         struct da9052_led *led;
73
74         led = container_of(led_cdev, struct da9052_led, cdev);
75         led->brightness = value;
76         schedule_work(&led->work);
77 }
78
79 static int da9052_configure_leds(struct da9052 *da9052)
80 {
81         int error;
82         unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
83                                        | DA9052_SET_HIGH_LVL_OUTPUT;
84
85         error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
86                                   DA9052_MASK_LOWER_NIBBLE,
87                                   register_value);
88
89         if (error < 0) {
90                 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
91                         error);
92                 return error;
93         }
94
95         error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
96                                   DA9052_MASK_UPPER_NIBBLE,
97                                   register_value << DA9052_NIBBLE_SHIFT);
98         if (error < 0)
99                 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
100                         error);
101
102         return error;
103 }
104
105 static int da9052_led_probe(struct platform_device *pdev)
106 {
107         struct da9052_pdata *pdata;
108         struct da9052 *da9052;
109         struct led_platform_data *pled;
110         struct da9052_led *led = NULL;
111         int error = -ENODEV;
112         int i;
113
114         da9052 = dev_get_drvdata(pdev->dev.parent);
115         pdata = da9052->dev->platform_data;
116         if (pdata == NULL) {
117                 dev_err(&pdev->dev, "No platform data\n");
118                 goto err;
119         }
120
121         pled = pdata->pled;
122         if (pled == NULL) {
123                 dev_err(&pdev->dev, "No platform data for LED\n");
124                 goto err;
125         }
126
127         led = devm_kzalloc(&pdev->dev,
128                            sizeof(struct da9052_led) * pled->num_leds,
129                            GFP_KERNEL);
130         if (led == NULL) {
131                 dev_err(&pdev->dev, "Failed to alloc memory\n");
132                 error = -ENOMEM;
133                 goto err;
134         }
135
136         for (i = 0; i < pled->num_leds; i++) {
137                 led[i].cdev.name = pled->leds[i].name;
138                 led[i].cdev.brightness_set = da9052_led_set;
139                 led[i].cdev.brightness = LED_OFF;
140                 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
141                 led[i].brightness = LED_OFF;
142                 led[i].led_index = pled->leds[i].flags;
143                 led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
144                 INIT_WORK(&led[i].work, da9052_led_work);
145
146                 error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
147                 if (error) {
148                         dev_err(&pdev->dev, "Failed to register led %d\n",
149                                 led[i].led_index);
150                         goto err_register;
151                 }
152
153                 error = da9052_set_led_brightness(&led[i]);
154                 if (error) {
155                         dev_err(&pdev->dev, "Unable to init led %d\n",
156                                 led[i].led_index);
157                         continue;
158                 }
159         }
160         error = da9052_configure_leds(led->da9052);
161         if (error) {
162                 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
163                 goto err_register;
164         }
165
166         platform_set_drvdata(pdev, led);
167
168         return 0;
169
170 err_register:
171         for (i = i - 1; i >= 0; i--) {
172                 led_classdev_unregister(&led[i].cdev);
173                 cancel_work_sync(&led[i].work);
174         }
175 err:
176         return error;
177 }
178
179 static int da9052_led_remove(struct platform_device *pdev)
180 {
181         struct da9052_led *led = platform_get_drvdata(pdev);
182         struct da9052_pdata *pdata;
183         struct da9052 *da9052;
184         struct led_platform_data *pled;
185         int i;
186
187         da9052 = dev_get_drvdata(pdev->dev.parent);
188         pdata = da9052->dev->platform_data;
189         pled = pdata->pled;
190
191         for (i = 0; i < pled->num_leds; i++) {
192                 led[i].brightness = 0;
193                 da9052_set_led_brightness(&led[i]);
194                 led_classdev_unregister(&led[i].cdev);
195                 cancel_work_sync(&led[i].work);
196         }
197
198         return 0;
199 }
200
201 static struct platform_driver da9052_led_driver = {
202         .driver         = {
203                 .name   = "da9052-leds",
204                 .owner  = THIS_MODULE,
205         },
206         .probe          = da9052_led_probe,
207         .remove         = da9052_led_remove,
208 };
209
210 module_platform_driver(da9052_led_driver);
211
212 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
213 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
214 MODULE_LICENSE("GPL");