Root/drivers/leds/leds-max8997.c

1/*
2 * leds-max8997.c - LED class driver for MAX8997 LEDs.
3 *
4 * Copyright (C) 2011 Samsung Electronics
5 * Donggeun Kim <dg77.kim@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/err.h>
15#include <linux/slab.h>
16#include <linux/workqueue.h>
17#include <linux/leds.h>
18#include <linux/mfd/max8997.h>
19#include <linux/mfd/max8997-private.h>
20#include <linux/platform_device.h>
21
22#define MAX8997_LED_FLASH_SHIFT 3
23#define MAX8997_LED_FLASH_CUR_MASK 0xf8
24#define MAX8997_LED_MOVIE_SHIFT 4
25#define MAX8997_LED_MOVIE_CUR_MASK 0xf0
26
27#define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
28#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
29#define MAX8997_LED_NONE_MAX_BRIGHTNESS 0
30
31#define MAX8997_LED0_FLASH_MASK 0x1
32#define MAX8997_LED0_FLASH_PIN_MASK 0x5
33#define MAX8997_LED0_MOVIE_MASK 0x8
34#define MAX8997_LED0_MOVIE_PIN_MASK 0x28
35
36#define MAX8997_LED1_FLASH_MASK 0x2
37#define MAX8997_LED1_FLASH_PIN_MASK 0x6
38#define MAX8997_LED1_MOVIE_MASK 0x10
39#define MAX8997_LED1_MOVIE_PIN_MASK 0x30
40
41#define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)
42
43struct max8997_led {
44    struct max8997_dev *iodev;
45    struct led_classdev cdev;
46    bool enabled;
47    int id;
48    enum max8997_led_mode led_mode;
49    struct mutex mutex;
50};
51
52static void max8997_led_set_mode(struct max8997_led *led,
53            enum max8997_led_mode mode)
54{
55    int ret;
56    struct i2c_client *client = led->iodev->i2c;
57    u8 mask = 0, val;
58
59    switch (mode) {
60    case MAX8997_FLASH_MODE:
61        mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
62        val = led->id ?
63              MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
64        led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
65        break;
66    case MAX8997_MOVIE_MODE:
67        mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
68        val = led->id ?
69              MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
70        led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
71        break;
72    case MAX8997_FLASH_PIN_CONTROL_MODE:
73        mask = MAX8997_LED1_FLASH_PIN_MASK |
74               MAX8997_LED0_FLASH_PIN_MASK;
75        val = led->id ?
76              MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
77        led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
78        break;
79    case MAX8997_MOVIE_PIN_CONTROL_MODE:
80        mask = MAX8997_LED1_MOVIE_PIN_MASK |
81               MAX8997_LED0_MOVIE_PIN_MASK;
82        val = led->id ?
83              MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
84        led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
85        break;
86    default:
87        led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
88        break;
89    }
90
91    if (mask) {
92        ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
93                     mask);
94        if (ret)
95            dev_err(led->iodev->dev,
96                "failed to update register(%d)\n", ret);
97    }
98
99    led->led_mode = mode;
100}
101
102static void max8997_led_enable(struct max8997_led *led, bool enable)
103{
104    int ret;
105    struct i2c_client *client = led->iodev->i2c;
106    u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
107
108    if (led->enabled == enable)
109        return;
110
111    val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
112
113    ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
114    if (ret)
115        dev_err(led->iodev->dev,
116            "failed to update register(%d)\n", ret);
117
118    led->enabled = enable;
119}
120
121static void max8997_led_set_current(struct max8997_led *led,
122                enum led_brightness value)
123{
124    int ret;
125    struct i2c_client *client = led->iodev->i2c;
126    u8 val = 0, mask = 0, reg = 0;
127
128    switch (led->led_mode) {
129    case MAX8997_FLASH_MODE:
130    case MAX8997_FLASH_PIN_CONTROL_MODE:
131        val = value << MAX8997_LED_FLASH_SHIFT;
132        mask = MAX8997_LED_FLASH_CUR_MASK;
133        reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
134        break;
135    case MAX8997_MOVIE_MODE:
136    case MAX8997_MOVIE_PIN_CONTROL_MODE:
137        val = value << MAX8997_LED_MOVIE_SHIFT;
138        mask = MAX8997_LED_MOVIE_CUR_MASK;
139        reg = MAX8997_REG_MOVIE_CUR;
140        break;
141    default:
142        break;
143    }
144
145    if (mask) {
146        ret = max8997_update_reg(client, reg, val, mask);
147        if (ret)
148            dev_err(led->iodev->dev,
149                "failed to update register(%d)\n", ret);
150    }
151}
152
153static void max8997_led_brightness_set(struct led_classdev *led_cdev,
154                enum led_brightness value)
155{
156    struct max8997_led *led =
157            container_of(led_cdev, struct max8997_led, cdev);
158
159    if (value) {
160        max8997_led_set_current(led, value);
161        max8997_led_enable(led, true);
162    } else {
163        max8997_led_set_current(led, value);
164        max8997_led_enable(led, false);
165    }
166}
167
168static ssize_t max8997_led_show_mode(struct device *dev,
169                struct device_attribute *attr, char *buf)
170{
171    struct led_classdev *led_cdev = dev_get_drvdata(dev);
172    struct max8997_led *led =
173            container_of(led_cdev, struct max8997_led, cdev);
174    ssize_t ret = 0;
175
176    mutex_lock(&led->mutex);
177
178    switch (led->led_mode) {
179    case MAX8997_FLASH_MODE:
180        ret += sprintf(buf, "FLASH\n");
181        break;
182    case MAX8997_MOVIE_MODE:
183        ret += sprintf(buf, "MOVIE\n");
184        break;
185    case MAX8997_FLASH_PIN_CONTROL_MODE:
186        ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
187        break;
188    case MAX8997_MOVIE_PIN_CONTROL_MODE:
189        ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
190        break;
191    default:
192        ret += sprintf(buf, "NONE\n");
193        break;
194    }
195
196    mutex_unlock(&led->mutex);
197
198    return ret;
199}
200
201static ssize_t max8997_led_store_mode(struct device *dev,
202                struct device_attribute *attr,
203                const char *buf, size_t size)
204{
205    struct led_classdev *led_cdev = dev_get_drvdata(dev);
206    struct max8997_led *led =
207            container_of(led_cdev, struct max8997_led, cdev);
208    enum max8997_led_mode mode;
209
210    mutex_lock(&led->mutex);
211
212    if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
213        mode = MAX8997_FLASH_PIN_CONTROL_MODE;
214    else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
215        mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
216    else if (!strncmp(buf, "FLASH", 5))
217        mode = MAX8997_FLASH_MODE;
218    else if (!strncmp(buf, "MOVIE", 5))
219        mode = MAX8997_MOVIE_MODE;
220    else
221        mode = MAX8997_NONE;
222
223    max8997_led_set_mode(led, mode);
224
225    mutex_unlock(&led->mutex);
226
227    return size;
228}
229
230static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
231
232static int max8997_led_probe(struct platform_device *pdev)
233{
234    struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
235    struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
236    struct max8997_led *led;
237    char name[20];
238    int ret = 0;
239
240    if (pdata == NULL) {
241        dev_err(&pdev->dev, "no platform data\n");
242        return -ENODEV;
243    }
244
245    led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
246    if (led == NULL)
247        return -ENOMEM;
248
249    led->id = pdev->id;
250    snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
251
252    led->cdev.name = name;
253    led->cdev.brightness_set = max8997_led_brightness_set;
254    led->cdev.flags |= LED_CORE_SUSPENDRESUME;
255    led->cdev.brightness = 0;
256    led->iodev = iodev;
257
258    /* initialize mode and brightness according to platform_data */
259    if (pdata->led_pdata) {
260        u8 mode = 0, brightness = 0;
261
262        mode = pdata->led_pdata->mode[led->id];
263        brightness = pdata->led_pdata->brightness[led->id];
264
265        max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
266
267        if (brightness > led->cdev.max_brightness)
268            brightness = led->cdev.max_brightness;
269        max8997_led_set_current(led, brightness);
270        led->cdev.brightness = brightness;
271    } else {
272        max8997_led_set_mode(led, MAX8997_NONE);
273        max8997_led_set_current(led, 0);
274    }
275
276    mutex_init(&led->mutex);
277
278    platform_set_drvdata(pdev, led);
279
280    ret = led_classdev_register(&pdev->dev, &led->cdev);
281    if (ret < 0)
282        return ret;
283
284    ret = device_create_file(led->cdev.dev, &dev_attr_mode);
285    if (ret != 0) {
286        dev_err(&pdev->dev,
287            "failed to create file: %d\n", ret);
288        led_classdev_unregister(&led->cdev);
289        return ret;
290    }
291
292    return 0;
293}
294
295static int max8997_led_remove(struct platform_device *pdev)
296{
297    struct max8997_led *led = platform_get_drvdata(pdev);
298
299    device_remove_file(led->cdev.dev, &dev_attr_mode);
300    led_classdev_unregister(&led->cdev);
301
302    return 0;
303}
304
305static struct platform_driver max8997_led_driver = {
306    .driver = {
307        .name = "max8997-led",
308        .owner = THIS_MODULE,
309    },
310    .probe = max8997_led_probe,
311    .remove = max8997_led_remove,
312};
313
314module_platform_driver(max8997_led_driver);
315
316MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
317MODULE_DESCRIPTION("MAX8997 LED driver");
318MODULE_LICENSE("GPL");
319MODULE_ALIAS("platform:max8997-led");
320

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