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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
37enum {
38 S5K6A3_SUPP_VDDA,
39 S5K6A3_SUPP_VDDIO,
40 S5K6A3_SUPP_AFVDD,
41 S5K6A3_NUM_SUPPLIES,
42};
43
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54
55
56
57struct 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
70static const char * const s5k6a3_supply_names[] = {
71 [S5K6A3_SUPP_VDDA] = "svdda",
72 [S5K6A3_SUPP_VDDIO] = "svddio",
73 [S5K6A3_SUPP_AFVDD] = "afvdd",
74};
75
76static inline struct s5k6a3 *sd_to_s5k6a3(struct v4l2_subdev *sd)
77{
78 return container_of(sd, struct s5k6a3, subdev);
79}
80
81static 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
89static 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
101static int s5k6a3_enum_mbus_code(struct v4l2_subdev *sd,
102 struct v4l2_subdev_state *sd_state,
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
112static 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
125static struct v4l2_mbus_framefmt *__s5k6a3_get_format(
126 struct s5k6a3 *sensor, struct v4l2_subdev_state *sd_state,
127 u32 pad, enum v4l2_subdev_format_whence which)
128{
129 if (which == V4L2_SUBDEV_FORMAT_TRY)
130 return sd_state ? v4l2_subdev_get_try_format(&sensor->subdev,
131 sd_state, pad) : NULL;
132
133 return &sensor->format;
134}
135
136static int s5k6a3_set_fmt(struct v4l2_subdev *sd,
137 struct v4l2_subdev_state *sd_state,
138 struct v4l2_subdev_format *fmt)
139{
140 struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
141 struct v4l2_mbus_framefmt *mf;
142
143 s5k6a3_try_format(&fmt->format);
144
145 mf = __s5k6a3_get_format(sensor, sd_state, fmt->pad, fmt->which);
146 if (mf) {
147 mutex_lock(&sensor->lock);
148 *mf = fmt->format;
149 mutex_unlock(&sensor->lock);
150 }
151 return 0;
152}
153
154static int s5k6a3_get_fmt(struct v4l2_subdev *sd,
155 struct v4l2_subdev_state *sd_state,
156 struct v4l2_subdev_format *fmt)
157{
158 struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
159 struct v4l2_mbus_framefmt *mf;
160
161 mf = __s5k6a3_get_format(sensor, sd_state, fmt->pad, fmt->which);
162
163 mutex_lock(&sensor->lock);
164 fmt->format = *mf;
165 mutex_unlock(&sensor->lock);
166 return 0;
167}
168
169static const struct v4l2_subdev_pad_ops s5k6a3_pad_ops = {
170 .enum_mbus_code = s5k6a3_enum_mbus_code,
171 .get_fmt = s5k6a3_get_fmt,
172 .set_fmt = s5k6a3_set_fmt,
173};
174
175static int s5k6a3_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
176{
177 struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(sd,
178 fh->state,
179 0);
180
181 *format = s5k6a3_formats[0];
182 format->width = S5K6A3_DEFAULT_WIDTH;
183 format->height = S5K6A3_DEFAULT_HEIGHT;
184
185 return 0;
186}
187
188static const struct v4l2_subdev_internal_ops s5k6a3_sd_internal_ops = {
189 .open = s5k6a3_open,
190};
191
192static int __s5k6a3_power_on(struct s5k6a3 *sensor)
193{
194 int i = S5K6A3_SUPP_VDDA;
195 int ret;
196
197 ret = clk_set_rate(sensor->clock, sensor->clock_frequency);
198 if (ret < 0)
199 return ret;
200
201 ret = pm_runtime_get(sensor->dev);
202 if (ret < 0)
203 goto error_rpm_put;
204
205 ret = regulator_enable(sensor->supplies[i].consumer);
206 if (ret < 0)
207 goto error_rpm_put;
208
209 ret = clk_prepare_enable(sensor->clock);
210 if (ret < 0)
211 goto error_reg_dis;
212
213 for (i++; i < S5K6A3_NUM_SUPPLIES; i++) {
214 ret = regulator_enable(sensor->supplies[i].consumer);
215 if (ret < 0)
216 goto error_reg_dis;
217 }
218
219 gpio_set_value(sensor->gpio_reset, 1);
220 usleep_range(600, 800);
221 gpio_set_value(sensor->gpio_reset, 0);
222 usleep_range(600, 800);
223 gpio_set_value(sensor->gpio_reset, 1);
224
225
226 msleep(20);
227 return 0;
228
229error_reg_dis:
230 for (--i; i >= 0; --i)
231 regulator_disable(sensor->supplies[i].consumer);
232error_rpm_put:
233 pm_runtime_put(sensor->dev);
234 return ret;
235}
236
237static int __s5k6a3_power_off(struct s5k6a3 *sensor)
238{
239 int i;
240
241 gpio_set_value(sensor->gpio_reset, 0);
242
243 for (i = S5K6A3_NUM_SUPPLIES - 1; i >= 0; i--)
244 regulator_disable(sensor->supplies[i].consumer);
245
246 clk_disable_unprepare(sensor->clock);
247 pm_runtime_put(sensor->dev);
248 return 0;
249}
250
251static int s5k6a3_s_power(struct v4l2_subdev *sd, int on)
252{
253 struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
254 int ret = 0;
255
256 mutex_lock(&sensor->lock);
257
258 if (sensor->power_count == !on) {
259 if (on)
260 ret = __s5k6a3_power_on(sensor);
261 else
262 ret = __s5k6a3_power_off(sensor);
263
264 if (ret == 0)
265 sensor->power_count += on ? 1 : -1;
266 }
267
268 mutex_unlock(&sensor->lock);
269 return ret;
270}
271
272static const struct v4l2_subdev_core_ops s5k6a3_core_ops = {
273 .s_power = s5k6a3_s_power,
274};
275
276static const struct v4l2_subdev_ops s5k6a3_subdev_ops = {
277 .core = &s5k6a3_core_ops,
278 .pad = &s5k6a3_pad_ops,
279};
280
281static int s5k6a3_probe(struct i2c_client *client)
282{
283 struct device *dev = &client->dev;
284 struct s5k6a3 *sensor;
285 struct v4l2_subdev *sd;
286 int gpio, i, ret;
287
288 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
289 if (!sensor)
290 return -ENOMEM;
291
292 mutex_init(&sensor->lock);
293 sensor->gpio_reset = -EINVAL;
294 sensor->clock = ERR_PTR(-EINVAL);
295 sensor->dev = dev;
296
297 sensor->clock = devm_clk_get(sensor->dev, S5K6A3_CLK_NAME);
298 if (IS_ERR(sensor->clock))
299 return PTR_ERR(sensor->clock);
300
301 gpio = of_get_gpio_flags(dev->of_node, 0, NULL);
302 if (!gpio_is_valid(gpio))
303 return gpio;
304
305 ret = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_LOW,
306 S5K6A3_DRV_NAME);
307 if (ret < 0)
308 return ret;
309
310 sensor->gpio_reset = gpio;
311
312 if (of_property_read_u32(dev->of_node, "clock-frequency",
313 &sensor->clock_frequency)) {
314 sensor->clock_frequency = S5K6A3_DEFAULT_CLK_FREQ;
315 dev_info(dev, "using default %u Hz clock frequency\n",
316 sensor->clock_frequency);
317 }
318
319 for (i = 0; i < S5K6A3_NUM_SUPPLIES; i++)
320 sensor->supplies[i].supply = s5k6a3_supply_names[i];
321
322 ret = devm_regulator_bulk_get(&client->dev, S5K6A3_NUM_SUPPLIES,
323 sensor->supplies);
324 if (ret < 0)
325 return ret;
326
327 sd = &sensor->subdev;
328 v4l2_i2c_subdev_init(sd, client, &s5k6a3_subdev_ops);
329 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
330 sd->internal_ops = &s5k6a3_sd_internal_ops;
331
332 sensor->format.code = s5k6a3_formats[0].code;
333 sensor->format.width = S5K6A3_DEFAULT_WIDTH;
334 sensor->format.height = S5K6A3_DEFAULT_HEIGHT;
335
336 sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
337 sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
338 ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
339 if (ret < 0)
340 return ret;
341
342 pm_runtime_no_callbacks(dev);
343 pm_runtime_enable(dev);
344
345 ret = v4l2_async_register_subdev(sd);
346
347 if (ret < 0) {
348 pm_runtime_disable(&client->dev);
349 media_entity_cleanup(&sd->entity);
350 }
351
352 return ret;
353}
354
355static int s5k6a3_remove(struct i2c_client *client)
356{
357 struct v4l2_subdev *sd = i2c_get_clientdata(client);
358
359 pm_runtime_disable(&client->dev);
360 v4l2_async_unregister_subdev(sd);
361 media_entity_cleanup(&sd->entity);
362 return 0;
363}
364
365static const struct i2c_device_id s5k6a3_ids[] = {
366 { }
367};
368MODULE_DEVICE_TABLE(i2c, s5k6a3_ids);
369
370#ifdef CONFIG_OF
371static const struct of_device_id s5k6a3_of_match[] = {
372 { .compatible = "samsung,s5k6a3" },
373 { }
374};
375MODULE_DEVICE_TABLE(of, s5k6a3_of_match);
376#endif
377
378static struct i2c_driver s5k6a3_driver = {
379 .driver = {
380 .of_match_table = of_match_ptr(s5k6a3_of_match),
381 .name = S5K6A3_DRV_NAME,
382 },
383 .probe_new = s5k6a3_probe,
384 .remove = s5k6a3_remove,
385 .id_table = s5k6a3_ids,
386};
387
388module_i2c_driver(s5k6a3_driver);
389
390MODULE_DESCRIPTION("S5K6A3 image sensor subdev driver");
391MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
392MODULE_LICENSE("GPL v2");
393
