kernel/drivers/media/i2c/s5k6a3.c

   1 /*
   2  * Samsung S5K6A3 image sensor driver
   3  *
   4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   5  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/gpio.h>
  17 #include <linux/i2c.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/slab.h>
  24 #include <linux/videodev2.h>
  25 #include <media/v4l2-async.h>
  26 #include <media/v4l2-subdev.h>
  27
  28 #define S5K6A3_SENSOR_MAX_WIDTH         1412
  29 #define S5K6A3_SENSOR_MAX_HEIGHT        1412
  30 #define S5K6A3_SENSOR_MIN_WIDTH         32
  31 #define S5K6A3_SENSOR_MIN_HEIGHT        32
  32
  33 #define S5K6A3_DEFAULT_WIDTH            1296
  34 #define S5K6A3_DEFAULT_HEIGHT           732
  35
  36 #define S5K6A3_DRV_NAME                 "S5K6A3"
  37 #define S5K6A3_CLK_NAME                 "extclk"
  38 #define S5K6A3_DEFAULT_CLK_FREQ         24000000U
  39
  40 enum {
  41         S5K6A3_SUPP_VDDA,
  42         S5K6A3_SUPP_VDDIO,
  43         S5K6A3_SUPP_AFVDD,
  44         S5K6A3_NUM_SUPPLIES,
  45 };
  46
  47 /**
  48  * struct s5k6a3 - fimc-is sensor data structure
  49  * @dev: pointer to this I2C client device structure
  50  * @subdev: the image sensor's v4l2 subdev
  51  * @pad: subdev media source pad
  52  * @supplies: image sensor's voltage regulator supplies
  53  * @gpio_reset: GPIO connected to the sensor's reset pin
  54  * @lock: mutex protecting the structure's members below
  55  * @format: media bus format at the sensor's source pad
  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                 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 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_pad_config *cfg,
 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, cfg, 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 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, fh->pad, 0);
 178
 179         *format         = s5k6a3_formats[0];
 180         format->width   = S5K6A3_DEFAULT_WIDTH;
 181         format->height  = S5K6A3_DEFAULT_HEIGHT;
 182
 183         return 0;
 184 }
 185
 186 static const struct v4l2_subdev_internal_ops s5k6a3_sd_internal_ops = {
 187         .open = s5k6a3_open,
 188 };
 189
 190 static int __s5k6a3_power_on(struct s5k6a3 *sensor)
 191 {
 192         int i = S5K6A3_SUPP_VDDA;
 193         int ret;
 194
 195         ret = clk_set_rate(sensor->clock, sensor->clock_frequency);
 196         if (ret < 0)
 197                 return ret;
 198
 199         ret = pm_runtime_get(sensor->dev);
 200         if (ret < 0)
 201                 return ret;
 202
 203         ret = regulator_enable(sensor->supplies[i].consumer);
 204         if (ret < 0)
 205                 goto error_rpm_put;
 206
 207         ret = clk_prepare_enable(sensor->clock);
 208         if (ret < 0)
 209                 goto error_reg_dis;
 210
 211         for (i++; i < S5K6A3_NUM_SUPPLIES; i++) {
 212                 ret = regulator_enable(sensor->supplies[i].consumer);
 213                 if (ret < 0)
 214                         goto error_reg_dis;
 215         }
 216
 217         gpio_set_value(sensor->gpio_reset, 1);
 218         usleep_range(600, 800);
 219         gpio_set_value(sensor->gpio_reset, 0);
 220         usleep_range(600, 800);
 221         gpio_set_value(sensor->gpio_reset, 1);
 222
 223         /* Delay needed for the sensor initialization */
 224         msleep(20);
 225         return 0;
 226
 227 error_reg_dis:
 228         for (--i; i >= 0; --i)
 229                 regulator_disable(sensor->supplies[i].consumer);
 230 error_rpm_put:
 231         pm_runtime_put(sensor->dev);
 232         return ret;
 233 }
 234
 235 static int __s5k6a3_power_off(struct s5k6a3 *sensor)
 236 {
 237         int i;
 238
 239         gpio_set_value(sensor->gpio_reset, 0);
 240
 241         for (i = S5K6A3_NUM_SUPPLIES - 1; i >= 0; i--)
 242                 regulator_disable(sensor->supplies[i].consumer);
 243
 244         clk_disable_unprepare(sensor->clock);
 245         pm_runtime_put(sensor->dev);
 246         return 0;
 247 }
 248
 249 static int s5k6a3_s_power(struct v4l2_subdev *sd, int on)
 250 {
 251         struct s5k6a3 *sensor = sd_to_s5k6a3(sd);
 252         int ret = 0;
 253
 254         mutex_lock(&sensor->lock);
 255
 256         if (sensor->power_count == !on) {
 257                 if (on)
 258                         ret = __s5k6a3_power_on(sensor);
 259                 else
 260                         ret = __s5k6a3_power_off(sensor);
 261
 262                 if (ret == 0)
 263                         sensor->power_count += on ? 1 : -1;
 264         }
 265
 266         mutex_unlock(&sensor->lock);
 267         return ret;
 268 }
 269
 270 static struct v4l2_subdev_core_ops s5k6a3_core_ops = {
 271         .s_power = s5k6a3_s_power,
 272 };
 273
 274 static struct v4l2_subdev_ops s5k6a3_subdev_ops = {
 275         .core = &s5k6a3_core_ops,
 276         .pad = &s5k6a3_pad_ops,
 277 };
 278
 279 static int s5k6a3_probe(struct i2c_client *client,
 280                                 const struct i2c_device_id *id)
 281 {
 282         struct device *dev = &client->dev;
 283         struct s5k6a3 *sensor;
 284         struct v4l2_subdev *sd;
 285         int gpio, i, ret;
 286
 287         sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
 288         if (!sensor)
 289                 return -ENOMEM;
 290
 291         mutex_init(&sensor->lock);
 292         sensor->gpio_reset = -EINVAL;
 293         sensor->clock = ERR_PTR(-EINVAL);
 294         sensor->dev = dev;
 295
 296         sensor->clock = devm_clk_get(sensor->dev, S5K6A3_CLK_NAME);
 297         if (IS_ERR(sensor->clock))
 298                 return PTR_ERR(sensor->clock);
 299
 300         gpio = of_get_gpio_flags(dev->of_node, 0, NULL);
 301         if (!gpio_is_valid(gpio))
 302                 return gpio;
 303
 304         ret = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_LOW,
 305                                                 S5K6A3_DRV_NAME);
 306         if (ret < 0)
 307                 return ret;
 308
 309         sensor->gpio_reset = gpio;
 310
 311         if (of_property_read_u32(dev->of_node, "clock-frequency",
 312                                  &sensor->clock_frequency)) {
 313                 sensor->clock_frequency = S5K6A3_DEFAULT_CLK_FREQ;
 314                 dev_info(dev, "using default %u Hz clock frequency\n",
 315                                         sensor->clock_frequency);
 316         }
 317
 318         for (i = 0; i < S5K6A3_NUM_SUPPLIES; i++)
 319                 sensor->supplies[i].supply = s5k6a3_supply_names[i];
 320
 321         ret = devm_regulator_bulk_get(&client->dev, S5K6A3_NUM_SUPPLIES,
 322                                       sensor->supplies);
 323         if (ret < 0)
 324                 return ret;
 325
 326         sd = &sensor->subdev;
 327         v4l2_i2c_subdev_init(sd, client, &s5k6a3_subdev_ops);
 328         sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 329         sd->internal_ops = &s5k6a3_sd_internal_ops;
 330
 331         sensor->format.code = s5k6a3_formats[0].code;
 332         sensor->format.width = S5K6A3_DEFAULT_WIDTH;
 333         sensor->format.height = S5K6A3_DEFAULT_HEIGHT;
 334
 335         sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
 336         ret = media_entity_init(&sd->entity, 1, &sensor->pad, 0);
 337         if (ret < 0)
 338                 return ret;
 339
 340         pm_runtime_no_callbacks(dev);
 341         pm_runtime_enable(dev);
 342
 343         ret = v4l2_async_register_subdev(sd);
 344
 345         if (ret < 0) {
 346                 pm_runtime_disable(&client->dev);
 347                 media_entity_cleanup(&sd->entity);
 348         }
 349
 350         return ret;
 351 }
 352
 353 static int s5k6a3_remove(struct i2c_client *client)
 354 {
 355         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 356
 357         pm_runtime_disable(&client->dev);
 358         v4l2_async_unregister_subdev(sd);
 359         media_entity_cleanup(&sd->entity);
 360         return 0;
 361 }
 362
 363 static const struct i2c_device_id s5k6a3_ids[] = {
 364         { }
 365 };
 366
 367 #ifdef CONFIG_OF
 368 static const struct of_device_id s5k6a3_of_match[] = {
 369         { .compatible = "samsung,s5k6a3" },
 370         { /* sentinel */ }
 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                 .owner          = THIS_MODULE,
 380         },
 381         .probe          = s5k6a3_probe,
 382         .remove         = s5k6a3_remove,
 383         .id_table       = s5k6a3_ids,
 384 };
 385
 386 module_i2c_driver(s5k6a3_driver);
 387
 388 MODULE_DESCRIPTION("S5K6A3 image sensor subdev driver");
 389 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 390 MODULE_LICENSE("GPL v2");