This source file includes following definitions.
- sd_to_s5k6a3
- find_sensor_format
- s5k6a3_enum_mbus_code
- s5k6a3_try_format
- __s5k6a3_get_format
- s5k6a3_set_fmt
- s5k6a3_get_fmt
- s5k6a3_open
- __s5k6a3_power_on
- __s5k6a3_power_off
- s5k6a3_s_power
- s5k6a3_probe
- s5k6a3_remove
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9 #include <linux/clk.h>
10 #include <linux/delay.h>
11 #include <linux/device.h>
12 #include <linux/errno.h>
13 #include <linux/gpio.h>
14 #include <linux/i2c.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/of_gpio.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/slab.h>
21 #include <linux/videodev2.h>
22 #include <media/v4l2-async.h>
23 #include <media/v4l2-subdev.h>
24
25 #define S5K6A3_SENSOR_MAX_WIDTH 1412
26 #define S5K6A3_SENSOR_MAX_HEIGHT 1412
27 #define S5K6A3_SENSOR_MIN_WIDTH 32
28 #define S5K6A3_SENSOR_MIN_HEIGHT 32
29
30 #define S5K6A3_DEFAULT_WIDTH 1296
31 #define S5K6A3_DEFAULT_HEIGHT 732
32
33 #define S5K6A3_DRV_NAME "S5K6A3"
34 #define S5K6A3_CLK_NAME "extclk"
35 #define S5K6A3_DEFAULT_CLK_FREQ 24000000U
36
37 enum {
38 S5K6A3_SUPP_VDDA,
39 S5K6A3_SUPP_VDDIO,
40 S5K6A3_SUPP_AFVDD,
41 S5K6A3_NUM_SUPPLIES,
42 };
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57 struct s5k6a3 {
58 struct device *dev;
59 struct v4l2_subdev subdev;
60 struct media_pad pad;
61 struct regulator_bulk_data supplies[S5K6A3_NUM_SUPPLIES];
62 int gpio_reset;
63 struct mutex lock;
64 struct v4l2_mbus_framefmt format;
65 struct clk *clock;
66 u32 clock_frequency;
67 int power_count;
68 };
69
70 static const char * const s5k6a3_supply_names[] = {
71 [S5K6A3_SUPP_VDDA] = "svdda",
72 [S5K6A3_SUPP_VDDIO] = "svddio",
73 [S5K6A3_SUPP_AFVDD] = "afvdd",
74 };
75
76 static inline struct s5k6a3 *sd_to_s5k6a3(struct v4l2_subdev *sd)
77 {
78 return container_of(sd, struct s5k6a3, subdev);
79 }
80
81 static const struct v4l2_mbus_framefmt s5k6a3_formats[] = {
82 {
83 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
84 .colorspace = V4L2_COLORSPACE_SRGB,
85 .field = V4L2_FIELD_NONE,
86 }
87 };
88
89 static const struct v4l2_mbus_framefmt *find_sensor_format(
90 struct v4l2_mbus_framefmt *mf)
91 {
92 int i;
93
94 for (i = 0; i < ARRAY_SIZE(s5k6a3_formats); i++)
95 if (mf->code == s5k6a3_formats[i].code)
96 return &s5k6a3_formats[i];
97
98 return &s5k6a3_formats[0];
99 }
100
101 static int s5k6a3_enum_mbus_code(struct v4l2_subdev *sd,
102 struct v4l2_subdev_pad_config *cfg,
103 struct v4l2_subdev_mbus_code_enum *code)
104 {
105 if (code->index >= ARRAY_SIZE(s5k6a3_formats))
106 return -EINVAL;
107
108 code->code = s5k6a3_formats[code->index].code;
109 return 0;
110 }
111
112 static void s5k6a3_try_format(struct v4l2_mbus_framefmt *mf)
113 {
114 const struct v4l2_mbus_framefmt *fmt;
115
116 fmt = find_sensor_format(mf);
117 mf->code = fmt->code;
118 mf->field = V4L2_FIELD_NONE;
119 v4l_bound_align_image(&mf->width, S5K6A3_SENSOR_MIN_WIDTH,
120 S5K6A3_SENSOR_MAX_WIDTH, 0,
121 &mf->height, S5K6A3_SENSOR_MIN_HEIGHT,
122 S5K6A3_SENSOR_MAX_HEIGHT, 0, 0);
123 }
124
125 static struct v4l2_mbus_framefmt *__s5k6a3_get_format(
126 struct s5k6a3 *sensor, struct v4l2_subdev_pad_config *cfg,
127 u32 pad, enum v4l2_subdev_format_whence which)
128 {
129 if (which == V4L2_SUBDEV_FORMAT_TRY)
130 return cfg ? v4l2_subdev_get_try_format(&sensor->subdev, cfg, pad) : NULL;
131
132 return &sensor->format;
133 }
134
135 static int s5k6a3_set_fmt(struct v4l2_subdev *sd,
136 struct v4l2_subdev_pad_config *cfg,
137 struct v4l2_subdev_format *fmt)
138 {
139 struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
140 struct v4l2_mbus_framefmt *mf;
141
142 s5k6a3_try_format(&fmt->format);
143
144 mf = __s5k6a3_get_format(sensor, cfg, fmt->pad, fmt->which);
145 if (mf) {
146 mutex_lock(&sensor->lock);
147 *mf = fmt->format;
148 mutex_unlock(&sensor->lock);
149 }
150 return 0;
151 }
152
153 static int s5k6a3_get_fmt(struct v4l2_subdev *sd,
154 struct v4l2_subdev_pad_config *cfg,
155 struct v4l2_subdev_format *fmt)
156 {
157 struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
158 struct v4l2_mbus_framefmt *mf;
159
160 mf = __s5k6a3_get_format(sensor, cfg, fmt->pad, fmt->which);
161
162 mutex_lock(&sensor->lock);
163 fmt->format = *mf;
164 mutex_unlock(&sensor->lock);
165 return 0;
166 }
167
168 static const struct v4l2_subdev_pad_ops s5k6a3_pad_ops = {
169 .enum_mbus_code = s5k6a3_enum_mbus_code,
170 .get_fmt = s5k6a3_get_fmt,
171 .set_fmt = s5k6a3_set_fmt,
172 };
173
174 static int s5k6a3_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
175 {
176 struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(sd, fh->pad, 0);
177
178 *format = s5k6a3_formats[0];
179 format->width = S5K6A3_DEFAULT_WIDTH;
180 format->height = S5K6A3_DEFAULT_HEIGHT;
181
182 return 0;
183 }
184
185 static const struct v4l2_subdev_internal_ops s5k6a3_sd_internal_ops = {
186 .open = s5k6a3_open,
187 };
188
189 static int __s5k6a3_power_on(struct s5k6a3 *sensor)
190 {
191 int i = S5K6A3_SUPP_VDDA;
192 int ret;
193
194 ret = clk_set_rate(sensor->clock, sensor->clock_frequency);
195 if (ret < 0)
196 return ret;
197
198 ret = pm_runtime_get(sensor->dev);
199 if (ret < 0)
200 return ret;
201
202 ret = regulator_enable(sensor->supplies[i].consumer);
203 if (ret < 0)
204 goto error_rpm_put;
205
206 ret = clk_prepare_enable(sensor->clock);
207 if (ret < 0)
208 goto error_reg_dis;
209
210 for (i++; i < S5K6A3_NUM_SUPPLIES; i++) {
211 ret = regulator_enable(sensor->supplies[i].consumer);
212 if (ret < 0)
213 goto error_reg_dis;
214 }
215
216 gpio_set_value(sensor->gpio_reset, 1);
217 usleep_range(600, 800);
218 gpio_set_value(sensor->gpio_reset, 0);
219 usleep_range(600, 800);
220 gpio_set_value(sensor->gpio_reset, 1);
221
222
223 msleep(20);
224 return 0;
225
226 error_reg_dis:
227 for (--i; i >= 0; --i)
228 regulator_disable(sensor->supplies[i].consumer);
229 error_rpm_put:
230 pm_runtime_put(sensor->dev);
231 return ret;
232 }
233
234 static int __s5k6a3_power_off(struct s5k6a3 *sensor)
235 {
236 int i;
237
238 gpio_set_value(sensor->gpio_reset, 0);
239
240 for (i = S5K6A3_NUM_SUPPLIES - 1; i >= 0; i--)
241 regulator_disable(sensor->supplies[i].consumer);
242
243 clk_disable_unprepare(sensor->clock);
244 pm_runtime_put(sensor->dev);
245 return 0;
246 }
247
248 static int s5k6a3_s_power(struct v4l2_subdev *sd, int on)
249 {
250 struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
251 int ret = 0;
252
253 mutex_lock(&sensor->lock);
254
255 if (sensor->power_count == !on) {
256 if (on)
257 ret = __s5k6a3_power_on(sensor);
258 else
259 ret = __s5k6a3_power_off(sensor);
260
261 if (ret == 0)
262 sensor->power_count += on ? 1 : -1;
263 }
264
265 mutex_unlock(&sensor->lock);
266 return ret;
267 }
268
269 static const struct v4l2_subdev_core_ops s5k6a3_core_ops = {
270 .s_power = s5k6a3_s_power,
271 };
272
273 static const struct v4l2_subdev_ops s5k6a3_subdev_ops = {
274 .core = &s5k6a3_core_ops,
275 .pad = &s5k6a3_pad_ops,
276 };
277
278 static int s5k6a3_probe(struct i2c_client *client)
279 {
280 struct device *dev = &client->dev;
281 struct s5k6a3 *sensor;
282 struct v4l2_subdev *sd;
283 int gpio, i, ret;
284
285 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
286 if (!sensor)
287 return -ENOMEM;
288
289 mutex_init(&sensor->lock);
290 sensor->gpio_reset = -EINVAL;
291 sensor->clock = ERR_PTR(-EINVAL);
292 sensor->dev = dev;
293
294 sensor->clock = devm_clk_get(sensor->dev, S5K6A3_CLK_NAME);
295 if (IS_ERR(sensor->clock))
296 return PTR_ERR(sensor->clock);
297
298 gpio = of_get_gpio_flags(dev->of_node, 0, NULL);
299 if (!gpio_is_valid(gpio))
300 return gpio;
301
302 ret = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_LOW,
303 S5K6A3_DRV_NAME);
304 if (ret < 0)
305 return ret;
306
307 sensor->gpio_reset = gpio;
308
309 if (of_property_read_u32(dev->of_node, "clock-frequency",
310 &sensor->clock_frequency)) {
311 sensor->clock_frequency = S5K6A3_DEFAULT_CLK_FREQ;
312 dev_info(dev, "using default %u Hz clock frequency\n",
313 sensor->clock_frequency);
314 }
315
316 for (i = 0; i < S5K6A3_NUM_SUPPLIES; i++)
317 sensor->supplies[i].supply = s5k6a3_supply_names[i];
318
319 ret = devm_regulator_bulk_get(&client->dev, S5K6A3_NUM_SUPPLIES,
320 sensor->supplies);
321 if (ret < 0)
322 return ret;
323
324 sd = &sensor->subdev;
325 v4l2_i2c_subdev_init(sd, client, &s5k6a3_subdev_ops);
326 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
327 sd->internal_ops = &s5k6a3_sd_internal_ops;
328
329 sensor->format.code = s5k6a3_formats[0].code;
330 sensor->format.width = S5K6A3_DEFAULT_WIDTH;
331 sensor->format.height = S5K6A3_DEFAULT_HEIGHT;
332
333 sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
334 sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
335 ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
336 if (ret < 0)
337 return ret;
338
339 pm_runtime_no_callbacks(dev);
340 pm_runtime_enable(dev);
341
342 ret = v4l2_async_register_subdev(sd);
343
344 if (ret < 0) {
345 pm_runtime_disable(&client->dev);
346 media_entity_cleanup(&sd->entity);
347 }
348
349 return ret;
350 }
351
352 static int s5k6a3_remove(struct i2c_client *client)
353 {
354 struct v4l2_subdev *sd = i2c_get_clientdata(client);
355
356 pm_runtime_disable(&client->dev);
357 v4l2_async_unregister_subdev(sd);
358 media_entity_cleanup(&sd->entity);
359 return 0;
360 }
361
362 static const struct i2c_device_id s5k6a3_ids[] = {
363 { }
364 };
365 MODULE_DEVICE_TABLE(i2c, s5k6a3_ids);
366
367 #ifdef CONFIG_OF
368 static const struct of_device_id s5k6a3_of_match[] = {
369 { .compatible = "samsung,s5k6a3" },
370 { }
371 };
372 MODULE_DEVICE_TABLE(of, s5k6a3_of_match);
373 #endif
374
375 static struct i2c_driver s5k6a3_driver = {
376 .driver = {
377 .of_match_table = of_match_ptr(s5k6a3_of_match),
378 .name = S5K6A3_DRV_NAME,
379 },
380 .probe_new = s5k6a3_probe,
381 .remove = s5k6a3_remove,
382 .id_table = s5k6a3_ids,
383 };
384
385 module_i2c_driver(s5k6a3_driver);
386
387 MODULE_DESCRIPTION("S5K6A3 image sensor subdev driver");
388 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
389 MODULE_LICENSE("GPL v2");