1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Samsung S5K6A3 image sensor driver 4 * 5 * Copyright (C) 2013 Samsung Electronics Co., Ltd. 6 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/delay.h> 11 #include <linux/device.h> 12 #include <linux/err.h> 13 #include <linux/errno.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/i2c.h> 16 #include <linux/kernel.h> 17 #include <linux/module.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 * struct s5k6a3 - fimc-is sensor data structure 46 * @dev: pointer to this I2C client device structure 47 * @subdev: the image sensor's v4l2 subdev 48 * @pad: subdev media source pad 49 * @supplies: image sensor's voltage regulator supplies 50 * @gpio_reset: GPIO connected to the sensor's reset pin 51 * @lock: mutex protecting the structure's members below 52 * @format: media bus format at the sensor's source pad 53 * @clock: pointer to &struct clk. 54 * @clock_frequency: clock frequency 55 * @power_count: stores state if device is powered 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 struct gpio_desc *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_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 } 111 112 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_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 } 135 136 static 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 } 153 154 static 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 } 168 169 static 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 }; 174 175 static 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 } 187 188 static const struct v4l2_subdev_internal_ops s5k6a3_sd_internal_ops = { 189 .open = s5k6a3_open, 190 }; 191 192 static 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_clk; 217 } 218 219 gpiod_set_value_cansleep(sensor->gpio_reset, 0); 220 usleep_range(600, 800); 221 gpiod_set_value_cansleep(sensor->gpio_reset, 1); 222 usleep_range(600, 800); 223 gpiod_set_value_cansleep(sensor->gpio_reset, 0); 224 225 /* Delay needed for the sensor initialization */ 226 msleep(20); 227 return 0; 228 229 error_clk: 230 clk_disable_unprepare(sensor->clock); 231 error_reg_dis: 232 for (--i; i >= 0; --i) 233 regulator_disable(sensor->supplies[i].consumer); 234 error_rpm_put: 235 pm_runtime_put(sensor->dev); 236 return ret; 237 } 238 239 static int __s5k6a3_power_off(struct s5k6a3 *sensor) 240 { 241 int i; 242 243 gpiod_set_value_cansleep(sensor->gpio_reset, 1); 244 245 for (i = S5K6A3_NUM_SUPPLIES - 1; i >= 0; i--) 246 regulator_disable(sensor->supplies[i].consumer); 247 248 clk_disable_unprepare(sensor->clock); 249 pm_runtime_put(sensor->dev); 250 return 0; 251 } 252 253 static int s5k6a3_s_power(struct v4l2_subdev *sd, int on) 254 { 255 struct s5k6a3 *sensor = sd_to_s5k6a3(sd); 256 int ret = 0; 257 258 mutex_lock(&sensor->lock); 259 260 if (sensor->power_count == !on) { 261 if (on) 262 ret = __s5k6a3_power_on(sensor); 263 else 264 ret = __s5k6a3_power_off(sensor); 265 266 if (ret == 0) 267 sensor->power_count += on ? 1 : -1; 268 } 269 270 mutex_unlock(&sensor->lock); 271 return ret; 272 } 273 274 static const struct v4l2_subdev_core_ops s5k6a3_core_ops = { 275 .s_power = s5k6a3_s_power, 276 }; 277 278 static const struct v4l2_subdev_ops s5k6a3_subdev_ops = { 279 .core = &s5k6a3_core_ops, 280 .pad = &s5k6a3_pad_ops, 281 }; 282 283 static int s5k6a3_probe(struct i2c_client *client) 284 { 285 struct device *dev = &client->dev; 286 struct s5k6a3 *sensor; 287 struct v4l2_subdev *sd; 288 int i, ret; 289 290 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); 291 if (!sensor) 292 return -ENOMEM; 293 294 mutex_init(&sensor->lock); 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 sensor->gpio_reset = devm_gpiod_get(dev, NULL, GPIOD_OUT_HIGH); 302 ret = PTR_ERR_OR_ZERO(sensor->gpio_reset); 303 if (ret) 304 return ret; 305 306 if (of_property_read_u32(dev->of_node, "clock-frequency", 307 &sensor->clock_frequency)) { 308 sensor->clock_frequency = S5K6A3_DEFAULT_CLK_FREQ; 309 dev_info(dev, "using default %u Hz clock frequency\n", 310 sensor->clock_frequency); 311 } 312 313 for (i = 0; i < S5K6A3_NUM_SUPPLIES; i++) 314 sensor->supplies[i].supply = s5k6a3_supply_names[i]; 315 316 ret = devm_regulator_bulk_get(&client->dev, S5K6A3_NUM_SUPPLIES, 317 sensor->supplies); 318 if (ret < 0) 319 return ret; 320 321 sd = &sensor->subdev; 322 v4l2_i2c_subdev_init(sd, client, &s5k6a3_subdev_ops); 323 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; 324 sd->internal_ops = &s5k6a3_sd_internal_ops; 325 326 sensor->format.code = s5k6a3_formats[0].code; 327 sensor->format.width = S5K6A3_DEFAULT_WIDTH; 328 sensor->format.height = S5K6A3_DEFAULT_HEIGHT; 329 330 sd->entity.function = MEDIA_ENT_F_CAM_SENSOR; 331 sensor->pad.flags = MEDIA_PAD_FL_SOURCE; 332 ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad); 333 if (ret < 0) 334 return ret; 335 336 pm_runtime_no_callbacks(dev); 337 pm_runtime_enable(dev); 338 339 ret = v4l2_async_register_subdev(sd); 340 341 if (ret < 0) { 342 pm_runtime_disable(&client->dev); 343 media_entity_cleanup(&sd->entity); 344 } 345 346 return ret; 347 } 348 349 static void s5k6a3_remove(struct i2c_client *client) 350 { 351 struct v4l2_subdev *sd = i2c_get_clientdata(client); 352 353 pm_runtime_disable(&client->dev); 354 v4l2_async_unregister_subdev(sd); 355 media_entity_cleanup(&sd->entity); 356 } 357 358 static const struct i2c_device_id s5k6a3_ids[] = { 359 { } 360 }; 361 MODULE_DEVICE_TABLE(i2c, s5k6a3_ids); 362 363 #ifdef CONFIG_OF 364 static const struct of_device_id s5k6a3_of_match[] = { 365 { .compatible = "samsung,s5k6a3" }, 366 { /* sentinel */ } 367 }; 368 MODULE_DEVICE_TABLE(of, s5k6a3_of_match); 369 #endif 370 371 static struct i2c_driver s5k6a3_driver = { 372 .driver = { 373 .of_match_table = of_match_ptr(s5k6a3_of_match), 374 .name = S5K6A3_DRV_NAME, 375 }, 376 .probe = s5k6a3_probe, 377 .remove = s5k6a3_remove, 378 .id_table = s5k6a3_ids, 379 }; 380 381 module_i2c_driver(s5k6a3_driver); 382 383 MODULE_DESCRIPTION("S5K6A3 image sensor subdev driver"); 384 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 385 MODULE_LICENSE("GPL v2"); 386