atomisp-ov2722.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Support for OmniVision OV2722 1080p HD camera sensor.
   4 *
   5 * Copyright (c) 2013 Intel Corporation. All Rights Reserved.
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/types.h>
  10#include <linux/kernel.h>
  11#include <linux/mm.h>
  12#include <linux/string.h>
  13#include <linux/errno.h>
  14#include <linux/init.h>
  15#include <linux/kmod.h>
  16#include <linux/device.h>
  17#include <linux/delay.h>
  18#include <linux/slab.h>
  19#include <linux/i2c.h>
  20#include <linux/moduleparam.h>
  21#include <media/v4l2-device.h>
  22#include "../include/linux/atomisp_gmin_platform.h"
  23#include <linux/acpi.h>
  24#include <linux/io.h>
  25
  26#include "ov2722.h"
  27
  28/* i2c read/write stuff */
  29static int ov2722_read_reg(struct i2c_client *client,
  30			   u16 data_length, u16 reg, u16 *val)
  31{
  32	int err;
  33	struct i2c_msg msg[2];
  34	unsigned char data[6];
  35
  36	if (!client->adapter) {
  37		dev_err(&client->dev, "%s error, no client->adapter\n",
  38			__func__);
  39		return -ENODEV;
  40	}
  41
  42	if (data_length != OV2722_8BIT && data_length != OV2722_16BIT &&
  43	    data_length != OV2722_32BIT) {
  44		dev_err(&client->dev, "%s error, invalid data length\n",
  45			__func__);
  46		return -EINVAL;
  47	}
  48
  49	memset(msg, 0, sizeof(msg));
  50
  51	msg[0].addr = client->addr;
  52	msg[0].flags = 0;
  53	msg[0].len = I2C_MSG_LENGTH;
  54	msg[0].buf = data;
  55
  56	/* high byte goes out first */
  57	data[0] = (u8)(reg >> 8);
  58	data[1] = (u8)(reg & 0xff);
  59
  60	msg[1].addr = client->addr;
  61	msg[1].len = data_length;
  62	msg[1].flags = I2C_M_RD;
  63	msg[1].buf = data;
  64
  65	err = i2c_transfer(client->adapter, msg, 2);
  66	if (err != 2) {
  67		if (err >= 0)
  68			err = -EIO;
  69		dev_err(&client->dev,
  70			"read from offset 0x%x error %d", reg, err);
  71		return err;
  72	}
  73
  74	*val = 0;
  75	/* high byte comes first */
  76	if (data_length == OV2722_8BIT)
  77		*val = (u8)data[0];
  78	else if (data_length == OV2722_16BIT)
  79		*val = be16_to_cpu(*(__be16 *)&data[0]);
  80	else
  81		*val = be32_to_cpu(*(__be32 *)&data[0]);
  82
  83	return 0;
  84}
  85
  86static int ov2722_i2c_write(struct i2c_client *client, u16 len, u8 *data)
  87{
  88	struct i2c_msg msg;
  89	const int num_msg = 1;
  90	int ret;
  91
  92	msg.addr = client->addr;
  93	msg.flags = 0;
  94	msg.len = len;
  95	msg.buf = data;
  96	ret = i2c_transfer(client->adapter, &msg, 1);
  97
  98	return ret == num_msg ? 0 : -EIO;
  99}
 100
 101static int ov2722_write_reg(struct i2c_client *client, u16 data_length,
 102			    u16 reg, u16 val)
 103{
 104	int ret;
 105	unsigned char data[4] = {0};
 106	__be16 *wreg = (__be16 *)data;
 107	const u16 len = data_length + sizeof(u16); /* 16-bit address + data */
 108
 109	if (data_length != OV2722_8BIT && data_length != OV2722_16BIT) {
 110		dev_err(&client->dev,
 111			"%s error, invalid data_length\n", __func__);
 112		return -EINVAL;
 113	}
 114
 115	/* high byte goes out first */
 116	*wreg = cpu_to_be16(reg);
 117
 118	if (data_length == OV2722_8BIT) {
 119		data[2] = (u8)(val);
 120	} else {
 121		/* OV2722_16BIT */
 122		__be16 *wdata = (__be16 *)&data[2];
 123
 124		*wdata = cpu_to_be16(val);
 125	}
 126
 127	ret = ov2722_i2c_write(client, len, data);
 128	if (ret)
 129		dev_err(&client->dev,
 130			"write error: wrote 0x%x to offset 0x%x error %d",
 131			val, reg, ret);
 132
 133	return ret;
 134}
 135
 136/*
 137 * ov2722_write_reg_array - Initializes a list of OV2722 registers
 138 * @client: i2c driver client structure
 139 * @reglist: list of registers to be written
 140 *
 141 * This function initializes a list of registers. When consecutive addresses
 142 * are found in a row on the list, this function creates a buffer and sends
 143 * consecutive data in a single i2c_transfer().
 144 *
 145 * __ov2722_flush_reg_array, __ov2722_buf_reg_array() and
 146 * __ov2722_write_reg_is_consecutive() are internal functions to
 147 * ov2722_write_reg_array_fast() and should be not used anywhere else.
 148 *
 149 */
 150
 151static int __ov2722_flush_reg_array(struct i2c_client *client,
 152				    struct ov2722_write_ctrl *ctrl)
 153{
 154	u16 size;
 155	__be16 *data16 = (void *)&ctrl->buffer.addr;
 156
 157	if (ctrl->index == 0)
 158		return 0;
 159
 160	size = sizeof(u16) + ctrl->index; /* 16-bit address + data */
 161	*data16 = cpu_to_be16(ctrl->buffer.addr);
 162	ctrl->index = 0;
 163
 164	return ov2722_i2c_write(client, size, (u8 *)&ctrl->buffer);
 165}
 166
 167static int __ov2722_buf_reg_array(struct i2c_client *client,
 168				  struct ov2722_write_ctrl *ctrl,
 169				  const struct ov2722_reg *next)
 170{
 171	int size;
 172	__be16 *data16;
 173
 174	switch (next->type) {
 175	case OV2722_8BIT:
 176		size = 1;
 177		ctrl->buffer.data[ctrl->index] = (u8)next->val;
 178		break;
 179	case OV2722_16BIT:
 180		size = 2;
 181		data16 = (void *)&ctrl->buffer.data[ctrl->index];
 182		*data16 = cpu_to_be16((u16)next->val);
 183		break;
 184	default:
 185		return -EINVAL;
 186	}
 187
 188	/* When first item is added, we need to store its starting address */
 189	if (ctrl->index == 0)
 190		ctrl->buffer.addr = next->reg;
 191
 192	ctrl->index += size;
 193
 194	/*
 195	 * Buffer cannot guarantee free space for u32? Better flush it to avoid
 196	 * possible lack of memory for next item.
 197	 */
 198	if (ctrl->index + sizeof(u16) >= OV2722_MAX_WRITE_BUF_SIZE)
 199		return __ov2722_flush_reg_array(client, ctrl);
 200
 201	return 0;
 202}
 203
 204static int __ov2722_write_reg_is_consecutive(struct i2c_client *client,
 205					     struct ov2722_write_ctrl *ctrl,
 206					     const struct ov2722_reg *next)
 207{
 208	if (ctrl->index == 0)
 209		return 1;
 210
 211	return ctrl->buffer.addr + ctrl->index == next->reg;
 212}
 213
 214static int ov2722_write_reg_array(struct i2c_client *client,
 215				  const struct ov2722_reg *reglist)
 216{
 217	const struct ov2722_reg *next = reglist;
 218	struct ov2722_write_ctrl ctrl;
 219	int err;
 220
 221	ctrl.index = 0;
 222	for (; next->type != OV2722_TOK_TERM; next++) {
 223		switch (next->type & OV2722_TOK_MASK) {
 224		case OV2722_TOK_DELAY:
 225			err = __ov2722_flush_reg_array(client, &ctrl);
 226			if (err)
 227				return err;
 228			msleep(next->val);
 229			break;
 230		default:
 231			/*
 232			 * If next address is not consecutive, data needs to be
 233			 * flushed before proceed.
 234			 */
 235			if (!__ov2722_write_reg_is_consecutive(client, &ctrl,
 236							       next)) {
 237				err = __ov2722_flush_reg_array(client, &ctrl);
 238				if (err)
 239					return err;
 240			}
 241			err = __ov2722_buf_reg_array(client, &ctrl, next);
 242			if (err) {
 243				dev_err(&client->dev, "%s: write error, aborted\n",
 244					__func__);
 245				return err;
 246			}
 247			break;
 248		}
 249	}
 250
 251	return __ov2722_flush_reg_array(client, &ctrl);
 252}
 253
 254static long __ov2722_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
 255				  int gain, int digitgain)
 256
 257{
 258	struct i2c_client *client = v4l2_get_subdevdata(sd);
 259	struct ov2722_device *dev = to_ov2722_sensor(sd);
 260	u16 hts, vts;
 261	int ret;
 262
 263	dev_dbg(&client->dev, "set_exposure without group hold\n");
 264
 265	/* clear VTS_DIFF on manual mode */
 266	ret = ov2722_write_reg(client, OV2722_16BIT, OV2722_VTS_DIFF_H, 0);
 267	if (ret)
 268		return ret;
 269
 270	hts = dev->pixels_per_line;
 271	vts = dev->lines_per_frame;
 272
 273	if ((coarse_itg + OV2722_COARSE_INTG_TIME_MAX_MARGIN) > vts)
 274		vts = coarse_itg + OV2722_COARSE_INTG_TIME_MAX_MARGIN;
 275
 276	coarse_itg <<= 4;
 277	digitgain <<= 2;
 278
 279	ret = ov2722_write_reg(client, OV2722_16BIT,
 280			       OV2722_VTS_H, vts);
 281	if (ret)
 282		return ret;
 283
 284	ret = ov2722_write_reg(client, OV2722_16BIT,
 285			       OV2722_HTS_H, hts);
 286	if (ret)
 287		return ret;
 288
 289	/* set exposure */
 290	ret = ov2722_write_reg(client, OV2722_8BIT,
 291			       OV2722_AEC_PK_EXPO_L,
 292			       coarse_itg & 0xff);
 293	if (ret)
 294		return ret;
 295
 296	ret = ov2722_write_reg(client, OV2722_16BIT,
 297			       OV2722_AEC_PK_EXPO_H,
 298			       (coarse_itg >> 8) & 0xfff);
 299	if (ret)
 300		return ret;
 301
 302	/* set analog gain */
 303	ret = ov2722_write_reg(client, OV2722_16BIT,
 304			       OV2722_AGC_ADJ_H, gain);
 305	if (ret)
 306		return ret;
 307
 308	/* set digital gain */
 309	ret = ov2722_write_reg(client, OV2722_16BIT,
 310			       OV2722_MWB_GAIN_R_H, digitgain);
 311	if (ret)
 312		return ret;
 313
 314	ret = ov2722_write_reg(client, OV2722_16BIT,
 315			       OV2722_MWB_GAIN_G_H, digitgain);
 316	if (ret)
 317		return ret;
 318
 319	ret = ov2722_write_reg(client, OV2722_16BIT,
 320			       OV2722_MWB_GAIN_B_H, digitgain);
 321
 322	return ret;
 323}
 324
 325static int ov2722_set_exposure(struct v4l2_subdev *sd, int exposure,
 326			       int gain, int digitgain)
 327{
 328	struct ov2722_device *dev = to_ov2722_sensor(sd);
 329	int ret;
 330
 331	mutex_lock(&dev->input_lock);
 332	ret = __ov2722_set_exposure(sd, exposure, gain, digitgain);
 333	mutex_unlock(&dev->input_lock);
 334
 335	return ret;
 336}
 337
 338static long ov2722_s_exposure(struct v4l2_subdev *sd,
 339			      struct atomisp_exposure *exposure)
 340{
 341	int exp = exposure->integration_time[0];
 342	int gain = exposure->gain[0];
 343	int digitgain = exposure->gain[1];
 344
 345	/* we should not accept the invalid value below. */
 346	if (gain == 0) {
 347		struct i2c_client *client = v4l2_get_subdevdata(sd);
 348
 349		v4l2_err(client, "%s: invalid value\n", __func__);
 350		return -EINVAL;
 351	}
 352
 353	return ov2722_set_exposure(sd, exp, gain, digitgain);
 354}
 355
 356static long ov2722_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
 357{
 358	switch (cmd) {
 359	case ATOMISP_IOC_S_EXPOSURE:
 360		return ov2722_s_exposure(sd, arg);
 361	default:
 362		return -EINVAL;
 363	}
 364	return 0;
 365}
 366
 367/* This returns the exposure time being used. This should only be used
 368 * for filling in EXIF data, not for actual image processing.
 369 */
 370static int ov2722_q_exposure(struct v4l2_subdev *sd, s32 *value)
 371{
 372	struct i2c_client *client = v4l2_get_subdevdata(sd);
 373	u16 reg_v, reg_v2;
 374	int ret;
 375
 376	/* get exposure */
 377	ret = ov2722_read_reg(client, OV2722_8BIT,
 378			      OV2722_AEC_PK_EXPO_L,
 379			      &reg_v);
 380	if (ret)
 381		goto err;
 382
 383	ret = ov2722_read_reg(client, OV2722_8BIT,
 384			      OV2722_AEC_PK_EXPO_M,
 385			      &reg_v2);
 386	if (ret)
 387		goto err;
 388
 389	reg_v += reg_v2 << 8;
 390	ret = ov2722_read_reg(client, OV2722_8BIT,
 391			      OV2722_AEC_PK_EXPO_H,
 392			      &reg_v2);
 393	if (ret)
 394		goto err;
 395
 396	*value = reg_v + (((u32)reg_v2 << 16));
 397err:
 398	return ret;
 399}
 400
 401static int ov2722_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 402{
 403	struct ov2722_device *dev =
 404	    container_of(ctrl->handler, struct ov2722_device, ctrl_handler);
 405	int ret = 0;
 406	unsigned int val;
 407
 408	switch (ctrl->id) {
 409	case V4L2_CID_EXPOSURE_ABSOLUTE:
 410		ret = ov2722_q_exposure(&dev->sd, &ctrl->val);
 411		break;
 412	case V4L2_CID_LINK_FREQ:
 413		val = dev->res->mipi_freq;
 414		if (val == 0)
 415			return -EINVAL;
 416
 417		ctrl->val = val * 1000;	/* To Hz */
 418		break;
 419	default:
 420		ret = -EINVAL;
 421	}
 422
 423	return ret;
 424}
 425
 426static const struct v4l2_ctrl_ops ctrl_ops = {
 427	.g_volatile_ctrl = ov2722_g_volatile_ctrl
 428};
 429
 430static const struct v4l2_ctrl_config ov2722_controls[] = {
 431	{
 432		.ops = &ctrl_ops,
 433		.id = V4L2_CID_EXPOSURE_ABSOLUTE,
 434		.type = V4L2_CTRL_TYPE_INTEGER,
 435		.name = "exposure",
 436		.min = 0x0,
 437		.max = 0xffff,
 438		.step = 0x01,
 439		.def = 0x00,
 440		.flags = 0,
 441	},
 442	{
 443		.ops = &ctrl_ops,
 444		.id = V4L2_CID_LINK_FREQ,
 445		.name = "Link Frequency",
 446		.type = V4L2_CTRL_TYPE_INTEGER,
 447		.min = 1,
 448		.max = 1500000 * 1000,
 449		.step = 1,
 450		.def = 1,
 451		.flags = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
 452	},
 453};
 454
 455static int ov2722_init(struct v4l2_subdev *sd)
 456{
 457	struct ov2722_device *dev = to_ov2722_sensor(sd);
 458
 459	mutex_lock(&dev->input_lock);
 460
 461	/* restore settings */
 462	ov2722_res = ov2722_res_preview;
 463	N_RES = N_RES_PREVIEW;
 464
 465	mutex_unlock(&dev->input_lock);
 466
 467	return 0;
 468}
 469
 470static int power_ctrl(struct v4l2_subdev *sd, bool flag)
 471{
 472	int ret = -1;
 473	struct ov2722_device *dev = to_ov2722_sensor(sd);
 474
 475	if (!dev || !dev->platform_data)
 476		return -ENODEV;
 477
 478	if (flag) {
 479		ret = dev->platform_data->v1p8_ctrl(sd, 1);
 480		if (ret == 0) {
 481			ret = dev->platform_data->v2p8_ctrl(sd, 1);
 482			if (ret)
 483				dev->platform_data->v1p8_ctrl(sd, 0);
 484		}
 485	} else {
 486		ret = dev->platform_data->v1p8_ctrl(sd, 0);
 487		ret |= dev->platform_data->v2p8_ctrl(sd, 0);
 488	}
 489
 490	return ret;
 491}
 492
 493static int gpio_ctrl(struct v4l2_subdev *sd, bool flag)
 494{
 495	struct ov2722_device *dev = to_ov2722_sensor(sd);
 496	int ret = -1;
 497
 498	if (!dev || !dev->platform_data)
 499		return -ENODEV;
 500
 501	/* Note: the GPIO order is asymmetric: always RESET#
 502	 * before PWDN# when turning it on or off.
 503	 */
 504	ret = dev->platform_data->gpio0_ctrl(sd, flag);
 505	ret |= dev->platform_data->gpio1_ctrl(sd, flag);
 506	return ret;
 507}
 508
 509static int power_up(struct v4l2_subdev *sd)
 510{
 511	struct ov2722_device *dev = to_ov2722_sensor(sd);
 512	struct i2c_client *client = v4l2_get_subdevdata(sd);
 513	int ret;
 514
 515	if (!dev->platform_data) {
 516		dev_err(&client->dev,
 517			"no camera_sensor_platform_data");
 518		return -ENODEV;
 519	}
 520
 521	/* power control */
 522	ret = power_ctrl(sd, 1);
 523	if (ret)
 524		goto fail_power;
 525
 526	/* according to DS, at least 5ms is needed between DOVDD and PWDN */
 527	usleep_range(5000, 6000);
 528
 529	/* gpio ctrl */
 530	ret = gpio_ctrl(sd, 1);
 531	if (ret) {
 532		ret = gpio_ctrl(sd, 0);
 533		if (ret)
 534			goto fail_power;
 535	}
 536
 537	/* flis clock control */
 538	ret = dev->platform_data->flisclk_ctrl(sd, 1);
 539	if (ret)
 540		goto fail_clk;
 541
 542	/* according to DS, 20ms is needed between PWDN and i2c access */
 543	msleep(20);
 544
 545	return 0;
 546
 547fail_clk:
 548	gpio_ctrl(sd, 0);
 549fail_power:
 550	power_ctrl(sd, 0);
 551	dev_err(&client->dev, "sensor power-up failed\n");
 552
 553	return ret;
 554}
 555
 556static int power_down(struct v4l2_subdev *sd)
 557{
 558	struct ov2722_device *dev = to_ov2722_sensor(sd);
 559	struct i2c_client *client = v4l2_get_subdevdata(sd);
 560	int ret = 0;
 561
 562	if (!dev->platform_data) {
 563		dev_err(&client->dev,
 564			"no camera_sensor_platform_data");
 565		return -ENODEV;
 566	}
 567
 568	ret = dev->platform_data->flisclk_ctrl(sd, 0);
 569	if (ret)
 570		dev_err(&client->dev, "flisclk failed\n");
 571
 572	/* gpio ctrl */
 573	ret = gpio_ctrl(sd, 0);
 574	if (ret) {
 575		ret = gpio_ctrl(sd, 0);
 576		if (ret)
 577			dev_err(&client->dev, "gpio failed 2\n");
 578	}
 579
 580	/* power control */
 581	ret = power_ctrl(sd, 0);
 582	if (ret)
 583		dev_err(&client->dev, "vprog failed.\n");
 584
 585	return ret;
 586}
 587
 588static int ov2722_s_power(struct v4l2_subdev *sd, int on)
 589{
 590	int ret;
 591
 592	if (on == 0)
 593		return power_down(sd);
 594
 595	ret = power_up(sd);
 596	if (!ret)
 597		return ov2722_init(sd);
 598
 599	return ret;
 600}
 601
 602/* TODO: remove it. */
 603static int ov2722_startup(struct v4l2_subdev *sd)
 604{
 605	struct ov2722_device *dev = to_ov2722_sensor(sd);
 606	struct i2c_client *client = v4l2_get_subdevdata(sd);
 607	int ret = 0;
 608
 609	ret = ov2722_write_reg(client, OV2722_8BIT,
 610			       OV2722_SW_RESET, 0x01);
 611	if (ret) {
 612		dev_err(&client->dev, "ov2722 reset err.\n");
 613		return ret;
 614	}
 615
 616	ret = ov2722_write_reg_array(client, dev->res->regs);
 617	if (ret) {
 618		dev_err(&client->dev, "ov2722 write register err.\n");
 619		return ret;
 620	}
 621
 622	return ret;
 623}
 624
 625static int ov2722_set_fmt(struct v4l2_subdev *sd,
 626			  struct v4l2_subdev_state *sd_state,
 627			  struct v4l2_subdev_format *format)
 628{
 629	struct v4l2_mbus_framefmt *fmt = &format->format;
 630	struct ov2722_device *dev = to_ov2722_sensor(sd);
 631	struct i2c_client *client = v4l2_get_subdevdata(sd);
 632	struct ov2722_resolution *res;
 633	struct camera_mipi_info *ov2722_info = NULL;
 634	int ret = 0;
 635
 636	if (format->pad)
 637		return -EINVAL;
 638	if (!fmt)
 639		return -EINVAL;
 640	ov2722_info = v4l2_get_subdev_hostdata(sd);
 641	if (!ov2722_info)
 642		return -EINVAL;
 643
 644	res = v4l2_find_nearest_size(ov2722_res_preview,
 645				     ARRAY_SIZE(ov2722_res_preview), width,
 646				     height, fmt->width, fmt->height);
 647	if (!res)
 648		res = &ov2722_res_preview[N_RES - 1];
 649
 650	fmt->width = res->width;
 651	fmt->height = res->height;
 652	dev->res = res;
 653
 654	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
 655	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 656		*v4l2_subdev_state_get_format(sd_state, 0) = *fmt;
 657		return 0;
 658	}
 659
 660	mutex_lock(&dev->input_lock);
 661
 662	dev->pixels_per_line = dev->res->pixels_per_line;
 663	dev->lines_per_frame = dev->res->lines_per_frame;
 664
 665	ret = ov2722_startup(sd);
 666	if (ret) {
 667		int i = 0;
 668
 669		dev_err(&client->dev, "ov2722 startup err, retry to power up\n");
 670		for (i = 0; i < OV2722_POWER_UP_RETRY_NUM; i++) {
 671			dev_err(&client->dev,
 672				"ov2722 retry to power up %d/%d times, result: ",
 673				i + 1, OV2722_POWER_UP_RETRY_NUM);
 674			power_down(sd);
 675			ret = power_up(sd);
 676			if (ret) {
 677				dev_err(&client->dev, "power up failed, continue\n");
 678				continue;
 679			}
 680			ret = ov2722_startup(sd);
 681			if (ret) {
 682				dev_err(&client->dev, " startup FAILED!\n");
 683			} else {
 684				dev_err(&client->dev, " startup SUCCESS!\n");
 685				break;
 686			}
 687		}
 688		if (ret) {
 689			dev_err(&client->dev, "ov2722 startup err\n");
 690			goto err;
 691		}
 692	}
 693
 694err:
 695	mutex_unlock(&dev->input_lock);
 696	return ret;
 697}
 698
 699static int ov2722_get_fmt(struct v4l2_subdev *sd,
 700			  struct v4l2_subdev_state *sd_state,
 701			  struct v4l2_subdev_format *format)
 702{
 703	struct v4l2_mbus_framefmt *fmt = &format->format;
 704	struct ov2722_device *dev = to_ov2722_sensor(sd);
 705
 706	if (format->pad)
 707		return -EINVAL;
 708	if (!fmt)
 709		return -EINVAL;
 710
 711	fmt->width = dev->res->width;
 712	fmt->height = dev->res->height;
 713	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 714
 715	return 0;
 716}
 717
 718static int ov2722_detect(struct i2c_client *client)
 719{
 720	struct i2c_adapter *adapter = client->adapter;
 721	u16 high = 0, low = 0;
 722	u16 id;
 723	u8 revision;
 724
 725	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
 726		return -ENODEV;
 727
 728	ov2722_read_reg(client, OV2722_8BIT,
 729			OV2722_SC_CMMN_CHIP_ID_H, &high);
 730	ov2722_read_reg(client, OV2722_8BIT,
 731			OV2722_SC_CMMN_CHIP_ID_L, &low);
 732	id = (high << 8) | low;
 733
 734	if ((id != OV2722_ID) && (id != OV2720_ID)) {
 735		dev_err(&client->dev, "sensor ID error\n");
 736		return -ENODEV;
 737	}
 738
 739	high = 0;
 740	ov2722_read_reg(client, OV2722_8BIT,
 741			OV2722_SC_CMMN_SUB_ID, &high);
 742	revision = (u8)high & 0x0f;
 743
 744	dev_dbg(&client->dev, "sensor_revision = 0x%x\n", revision);
 745	dev_dbg(&client->dev, "detect ov2722 success\n");
 746	return 0;
 747}
 748
 749static int ov2722_s_stream(struct v4l2_subdev *sd, int enable)
 750{
 751	struct ov2722_device *dev = to_ov2722_sensor(sd);
 752	struct i2c_client *client = v4l2_get_subdevdata(sd);
 753	int ret;
 754
 755	mutex_lock(&dev->input_lock);
 756
 757	ret = ov2722_write_reg(client, OV2722_8BIT, OV2722_SW_STREAM,
 758			       enable ? OV2722_START_STREAMING :
 759			       OV2722_STOP_STREAMING);
 760
 761	mutex_unlock(&dev->input_lock);
 762	return ret;
 763}
 764
 765static int ov2722_s_config(struct v4l2_subdev *sd,
 766			   int irq, void *platform_data)
 767{
 768	struct ov2722_device *dev = to_ov2722_sensor(sd);
 769	struct i2c_client *client = v4l2_get_subdevdata(sd);
 770	int ret = 0;
 771
 772	if (!platform_data)
 773		return -ENODEV;
 774
 775	dev->platform_data =
 776	    (struct camera_sensor_platform_data *)platform_data;
 777
 778	mutex_lock(&dev->input_lock);
 779
 780	/* power off the module, then power on it in future
 781	 * as first power on by board may not fulfill the
 782	 * power on sequqence needed by the module
 783	 */
 784	ret = power_down(sd);
 785	if (ret) {
 786		dev_err(&client->dev, "ov2722 power-off err.\n");
 787		goto fail_power_off;
 788	}
 789
 790	ret = power_up(sd);
 791	if (ret) {
 792		dev_err(&client->dev, "ov2722 power-up err.\n");
 793		goto fail_power_on;
 794	}
 795
 796	ret = dev->platform_data->csi_cfg(sd, 1);
 797	if (ret)
 798		goto fail_csi_cfg;
 799
 800	/* config & detect sensor */
 801	ret = ov2722_detect(client);
 802	if (ret) {
 803		dev_err(&client->dev, "ov2722_detect err s_config.\n");
 804		goto fail_csi_cfg;
 805	}
 806
 807	/* turn off sensor, after probed */
 808	ret = power_down(sd);
 809	if (ret) {
 810		dev_err(&client->dev, "ov2722 power-off err.\n");
 811		goto fail_csi_cfg;
 812	}
 813	mutex_unlock(&dev->input_lock);
 814
 815	return 0;
 816
 817fail_csi_cfg:
 818	dev->platform_data->csi_cfg(sd, 0);
 819fail_power_on:
 820	power_down(sd);
 821	dev_err(&client->dev, "sensor power-gating failed\n");
 822fail_power_off:
 823	mutex_unlock(&dev->input_lock);
 824	return ret;
 825}
 826
 827static int ov2722_get_frame_interval(struct v4l2_subdev *sd,
 828				     struct v4l2_subdev_state *sd_state,
 829				     struct v4l2_subdev_frame_interval *interval)
 830{
 831	struct ov2722_device *dev = to_ov2722_sensor(sd);
 832
 833	/*
 834	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
 835	 * subdev active state API.
 836	 */
 837	if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 838		return -EINVAL;
 839
 840	interval->interval.numerator = 1;
 841	interval->interval.denominator = dev->res->fps;
 842
 843	return 0;
 844}
 845
 846static int ov2722_enum_mbus_code(struct v4l2_subdev *sd,
 847				 struct v4l2_subdev_state *sd_state,
 848				 struct v4l2_subdev_mbus_code_enum *code)
 849{
 850	if (code->index >= MAX_FMTS)
 851		return -EINVAL;
 852
 853	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 854	return 0;
 855}
 856
 857static int ov2722_enum_frame_size(struct v4l2_subdev *sd,
 858				  struct v4l2_subdev_state *sd_state,
 859				  struct v4l2_subdev_frame_size_enum *fse)
 860{
 861	int index = fse->index;
 862
 863	if (index >= N_RES)
 864		return -EINVAL;
 865
 866	fse->min_width = ov2722_res[index].width;
 867	fse->min_height = ov2722_res[index].height;
 868	fse->max_width = ov2722_res[index].width;
 869	fse->max_height = ov2722_res[index].height;
 870
 871	return 0;
 872}
 873
 874static int ov2722_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
 875{
 876	struct ov2722_device *dev = to_ov2722_sensor(sd);
 877
 878	mutex_lock(&dev->input_lock);
 879	*frames = dev->res->skip_frames;
 880	mutex_unlock(&dev->input_lock);
 881
 882	return 0;
 883}
 884
 885static const struct v4l2_subdev_sensor_ops ov2722_sensor_ops = {
 886	.g_skip_frames	= ov2722_g_skip_frames,
 887};
 888
 889static const struct v4l2_subdev_video_ops ov2722_video_ops = {
 890	.s_stream = ov2722_s_stream,
 891};
 892
 893static const struct v4l2_subdev_core_ops ov2722_core_ops = {
 894	.s_power = ov2722_s_power,
 895	.ioctl = ov2722_ioctl,
 896};
 897
 898static const struct v4l2_subdev_pad_ops ov2722_pad_ops = {
 899	.enum_mbus_code = ov2722_enum_mbus_code,
 900	.enum_frame_size = ov2722_enum_frame_size,
 901	.get_fmt = ov2722_get_fmt,
 902	.set_fmt = ov2722_set_fmt,
 903	.get_frame_interval = ov2722_get_frame_interval,
 904};
 905
 906static const struct v4l2_subdev_ops ov2722_ops = {
 907	.core = &ov2722_core_ops,
 908	.video = &ov2722_video_ops,
 909	.pad = &ov2722_pad_ops,
 910	.sensor = &ov2722_sensor_ops,
 911};
 912
 913static void ov2722_remove(struct i2c_client *client)
 914{
 915	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 916	struct ov2722_device *dev = to_ov2722_sensor(sd);
 917
 918	dev->platform_data->csi_cfg(sd, 0);
 919	v4l2_ctrl_handler_free(&dev->ctrl_handler);
 920	v4l2_device_unregister_subdev(sd);
 921
 922	atomisp_gmin_remove_subdev(sd);
 923
 924	media_entity_cleanup(&dev->sd.entity);
 925	kfree(dev);
 926}
 927
 928static int __ov2722_init_ctrl_handler(struct ov2722_device *dev)
 929{
 930	struct v4l2_ctrl_handler *hdl;
 931	unsigned int i;
 932
 933	hdl = &dev->ctrl_handler;
 934	v4l2_ctrl_handler_init(&dev->ctrl_handler, ARRAY_SIZE(ov2722_controls));
 935	for (i = 0; i < ARRAY_SIZE(ov2722_controls); i++)
 936		v4l2_ctrl_new_custom(&dev->ctrl_handler, &ov2722_controls[i],
 937				     NULL);
 938
 939	dev->link_freq = v4l2_ctrl_find(&dev->ctrl_handler, V4L2_CID_LINK_FREQ);
 940
 941	if (dev->ctrl_handler.error || !dev->link_freq)
 942		return dev->ctrl_handler.error;
 943
 944	dev->sd.ctrl_handler = hdl;
 945
 946	return 0;
 947}
 948
 949static int ov2722_probe(struct i2c_client *client)
 950{
 951	struct ov2722_device *dev;
 952	void *ovpdev;
 953	int ret;
 954
 955	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 956	if (!dev)
 957		return -ENOMEM;
 958
 959	mutex_init(&dev->input_lock);
 960
 961	dev->res = &ov2722_res_preview[0];
 962	v4l2_i2c_subdev_init(&dev->sd, client, &ov2722_ops);
 963
 964	ovpdev = gmin_camera_platform_data(&dev->sd,
 965					   ATOMISP_INPUT_FORMAT_RAW_10,
 966					   atomisp_bayer_order_grbg);
 967
 968	ret = ov2722_s_config(&dev->sd, client->irq, ovpdev);
 969	if (ret)
 970		goto out_free;
 971
 972	ret = __ov2722_init_ctrl_handler(dev);
 973	if (ret)
 974		goto out_ctrl_handler_free;
 975
 976	dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 977	dev->pad.flags = MEDIA_PAD_FL_SOURCE;
 978	dev->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
 979	dev->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 980
 981	ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
 982	if (ret)
 983		ov2722_remove(client);
 984
 985	return atomisp_register_i2c_module(&dev->sd, ovpdev);
 986
 987out_ctrl_handler_free:
 988	v4l2_ctrl_handler_free(&dev->ctrl_handler);
 989
 990out_free:
 991	atomisp_gmin_remove_subdev(&dev->sd);
 992	v4l2_device_unregister_subdev(&dev->sd);
 993	kfree(dev);
 994	return ret;
 995}
 996
 997static const struct acpi_device_id ov2722_acpi_match[] = {
 998	{ "INT33FB" },
 999	{},
1000};
1001MODULE_DEVICE_TABLE(acpi, ov2722_acpi_match);
1002
1003static struct i2c_driver ov2722_driver = {
1004	.driver = {
1005		.name = "ov2722",
1006		.acpi_match_table = ov2722_acpi_match,
1007	},
1008	.probe = ov2722_probe,
1009	.remove = ov2722_remove,
1010};
1011module_i2c_driver(ov2722_driver);
1012
1013MODULE_AUTHOR("Wei Liu <wei.liu@intel.com>");
1014MODULE_DESCRIPTION("A low-level driver for OmniVision 2722 sensors");
1015MODULE_LICENSE("GPL");