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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
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
