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13#include <linux/module.h>
14#include <linux/err.h>
15#include <linux/slab.h>
16#include <linux/leds.h>
17#include <linux/mfd/max8997.h>
18#include <linux/mfd/max8997-private.h>
19#include <linux/platform_device.h>
20
21#define MAX8997_LED_FLASH_SHIFT 3
22#define MAX8997_LED_FLASH_CUR_MASK 0xf8
23#define MAX8997_LED_MOVIE_SHIFT 4
24#define MAX8997_LED_MOVIE_CUR_MASK 0xf0
25
26#define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
27#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
28#define MAX8997_LED_NONE_MAX_BRIGHTNESS 0
29
30#define MAX8997_LED0_FLASH_MASK 0x1
31#define MAX8997_LED0_FLASH_PIN_MASK 0x5
32#define MAX8997_LED0_MOVIE_MASK 0x8
33#define MAX8997_LED0_MOVIE_PIN_MASK 0x28
34
35#define MAX8997_LED1_FLASH_MASK 0x2
36#define MAX8997_LED1_FLASH_PIN_MASK 0x6
37#define MAX8997_LED1_MOVIE_MASK 0x10
38#define MAX8997_LED1_MOVIE_PIN_MASK 0x30
39
40#define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)
41
42struct max8997_led {
43 struct max8997_dev *iodev;
44 struct led_classdev cdev;
45 bool enabled;
46 int id;
47 enum max8997_led_mode led_mode;
48 struct mutex mutex;
49};
50
51static void max8997_led_set_mode(struct max8997_led *led,
52 enum max8997_led_mode mode)
53{
54 int ret;
55 struct i2c_client *client = led->iodev->i2c;
56 u8 mask = 0, val;
57
58 switch (mode) {
59 case MAX8997_FLASH_MODE:
60 mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
61 val = led->id ?
62 MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
63 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
64 break;
65 case MAX8997_MOVIE_MODE:
66 mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
67 val = led->id ?
68 MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
69 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
70 break;
71 case MAX8997_FLASH_PIN_CONTROL_MODE:
72 mask = MAX8997_LED1_FLASH_PIN_MASK |
73 MAX8997_LED0_FLASH_PIN_MASK;
74 val = led->id ?
75 MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
76 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
77 break;
78 case MAX8997_MOVIE_PIN_CONTROL_MODE:
79 mask = MAX8997_LED1_MOVIE_PIN_MASK |
80 MAX8997_LED0_MOVIE_PIN_MASK;
81 val = led->id ?
82 MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
83 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
84 break;
85 default:
86 led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
87 break;
88 }
89
90 if (mask) {
91 ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
92 mask);
93 if (ret)
94 dev_err(led->iodev->dev,
95 "failed to update register(%d)\n", ret);
96 }
97
98 led->led_mode = mode;
99}
100
101static void max8997_led_enable(struct max8997_led *led, bool enable)
102{
103 int ret;
104 struct i2c_client *client = led->iodev->i2c;
105 u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
106
107 if (led->enabled == enable)
108 return;
109
110 val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
111
112 ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
113 if (ret)
114 dev_err(led->iodev->dev,
115 "failed to update register(%d)\n", ret);
116
117 led->enabled = enable;
118}
119
120static void max8997_led_set_current(struct max8997_led *led,
121 enum led_brightness value)
122{
123 int ret;
124 struct i2c_client *client = led->iodev->i2c;
125 u8 val = 0, mask = 0, reg = 0;
126
127 switch (led->led_mode) {
128 case MAX8997_FLASH_MODE:
129 case MAX8997_FLASH_PIN_CONTROL_MODE:
130 val = value << MAX8997_LED_FLASH_SHIFT;
131 mask = MAX8997_LED_FLASH_CUR_MASK;
132 reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
133 break;
134 case MAX8997_MOVIE_MODE:
135 case MAX8997_MOVIE_PIN_CONTROL_MODE:
136 val = value << MAX8997_LED_MOVIE_SHIFT;
137 mask = MAX8997_LED_MOVIE_CUR_MASK;
138 reg = MAX8997_REG_MOVIE_CUR;
139 break;
140 default:
141 break;
142 }
143
144 if (mask) {
145 ret = max8997_update_reg(client, reg, val, mask);
146 if (ret)
147 dev_err(led->iodev->dev,
148 "failed to update register(%d)\n", ret);
149 }
150}
151
152static void max8997_led_brightness_set(struct led_classdev *led_cdev,
153 enum led_brightness value)
154{
155 struct max8997_led *led =
156 container_of(led_cdev, struct max8997_led, cdev);
157
158 if (value) {
159 max8997_led_set_current(led, value);
160 max8997_led_enable(led, true);
161 } else {
162 max8997_led_set_current(led, value);
163 max8997_led_enable(led, false);
164 }
165}
166
167static ssize_t max8997_led_show_mode(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 struct led_classdev *led_cdev = dev_get_drvdata(dev);
171 struct max8997_led *led =
172 container_of(led_cdev, struct max8997_led, cdev);
173 ssize_t ret = 0;
174
175 mutex_lock(&led->mutex);
176
177 switch (led->led_mode) {
178 case MAX8997_FLASH_MODE:
179 ret += sprintf(buf, "FLASH\n");
180 break;
181 case MAX8997_MOVIE_MODE:
182 ret += sprintf(buf, "MOVIE\n");
183 break;
184 case MAX8997_FLASH_PIN_CONTROL_MODE:
185 ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
186 break;
187 case MAX8997_MOVIE_PIN_CONTROL_MODE:
188 ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
189 break;
190 default:
191 ret += sprintf(buf, "NONE\n");
192 break;
193 }
194
195 mutex_unlock(&led->mutex);
196
197 return ret;
198}
199
200static ssize_t max8997_led_store_mode(struct device *dev,
201 struct device_attribute *attr,
202 const char *buf, size_t size)
203{
204 struct led_classdev *led_cdev = dev_get_drvdata(dev);
205 struct max8997_led *led =
206 container_of(led_cdev, struct max8997_led, cdev);
207 enum max8997_led_mode mode;
208
209 mutex_lock(&led->mutex);
210
211 if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
212 mode = MAX8997_FLASH_PIN_CONTROL_MODE;
213 else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
214 mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
215 else if (!strncmp(buf, "FLASH", 5))
216 mode = MAX8997_FLASH_MODE;
217 else if (!strncmp(buf, "MOVIE", 5))
218 mode = MAX8997_MOVIE_MODE;
219 else
220 mode = MAX8997_NONE;
221
222 max8997_led_set_mode(led, mode);
223
224 mutex_unlock(&led->mutex);
225
226 return size;
227}
228
229static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
230
231static struct attribute *max8997_attrs[] = {
232 &dev_attr_mode.attr,
233 NULL
234};
235ATTRIBUTE_GROUPS(max8997);
236
237static int max8997_led_probe(struct platform_device *pdev)
238{
239 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
240 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
241 struct max8997_led *led;
242 char name[20];
243 int ret = 0;
244
245 if (pdata == NULL) {
246 dev_err(&pdev->dev, "no platform data\n");
247 return -ENODEV;
248 }
249
250 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
251 if (led == NULL)
252 return -ENOMEM;
253
254 led->id = pdev->id;
255 snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
256
257 led->cdev.name = name;
258 led->cdev.brightness_set = max8997_led_brightness_set;
259 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
260 led->cdev.brightness = 0;
261 led->cdev.groups = max8997_groups;
262 led->iodev = iodev;
263
264
265 if (pdata->led_pdata) {
266 u8 mode = 0, brightness = 0;
267
268 mode = pdata->led_pdata->mode[led->id];
269 brightness = pdata->led_pdata->brightness[led->id];
270
271 max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
272
273 if (brightness > led->cdev.max_brightness)
274 brightness = led->cdev.max_brightness;
275 max8997_led_set_current(led, brightness);
276 led->cdev.brightness = brightness;
277 } else {
278 max8997_led_set_mode(led, MAX8997_NONE);
279 max8997_led_set_current(led, 0);
280 }
281
282 mutex_init(&led->mutex);
283
284 ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
285 if (ret < 0)
286 return ret;
287
288 return 0;
289}
290
291static struct platform_driver max8997_led_driver = {
292 .driver = {
293 .name = "max8997-led",
294 },
295 .probe = max8997_led_probe,
296};
297
298module_platform_driver(max8997_led_driver);
299
300MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
301MODULE_DESCRIPTION("MAX8997 LED driver");
302MODULE_LICENSE("GPL");
303MODULE_ALIAS("platform:max8997-led");
304
