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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * GS1662 device registration.4 *5 * Copyright (C) 2015-2016 Nexvision6 * Author: Charles-Antoine Couret <charles-antoine.couret@nexvision.fr>7 */8 9#include <linux/kernel.h>10#include <linux/init.h>11#include <linux/spi/spi.h>12#include <linux/platform_device.h>13#include <linux/ctype.h>14#include <linux/err.h>15#include <linux/device.h>16#include <linux/module.h>17 18#include <linux/videodev2.h>19#include <media/v4l2-common.h>20#include <media/v4l2-ctrls.h>21#include <media/v4l2-device.h>22#include <media/v4l2-subdev.h>23#include <media/v4l2-dv-timings.h>24#include <linux/v4l2-dv-timings.h>25 26#define REG_STATUS			0x0427#define REG_FORCE_FMT			0x0628#define REG_LINES_PER_FRAME		0x1229#define REG_WORDS_PER_LINE		0x1330#define REG_WORDS_PER_ACT_LINE		0x1431#define REG_ACT_LINES_PER_FRAME	0x1532 33#define MASK_H_LOCK			0x00134#define MASK_V_LOCK			0x00235#define MASK_STD_LOCK			0x00436#define MASK_FORCE_STD			0x02037#define MASK_STD_STATUS		0x3E038 39#define GS_WIDTH_MIN			72040#define GS_WIDTH_MAX			204841#define GS_HEIGHT_MIN			48742#define GS_HEIGHT_MAX			108043#define GS_PIXELCLOCK_MIN		1051920044#define GS_PIXELCLOCK_MAX		7425000045 46struct gs {47	struct spi_device *pdev;48	struct v4l2_subdev sd;49	struct v4l2_dv_timings current_timings;50	int enabled;51};52 53struct gs_reg_fmt {54	u16 reg_value;55	struct v4l2_dv_timings format;56};57 58static const struct spi_device_id gs_id[] = {59	{ "gs1662", 0 },60	{ }61};62MODULE_DEVICE_TABLE(spi, gs_id);63 64static const struct v4l2_dv_timings fmt_cap[] = {65	V4L2_DV_BT_SDI_720X487I60,66	V4L2_DV_BT_CEA_720X576P50,67	V4L2_DV_BT_CEA_1280X720P24,68	V4L2_DV_BT_CEA_1280X720P25,69	V4L2_DV_BT_CEA_1280X720P30,70	V4L2_DV_BT_CEA_1280X720P50,71	V4L2_DV_BT_CEA_1280X720P60,72	V4L2_DV_BT_CEA_1920X1080P24,73	V4L2_DV_BT_CEA_1920X1080P25,74	V4L2_DV_BT_CEA_1920X1080P30,75	V4L2_DV_BT_CEA_1920X1080I50,76	V4L2_DV_BT_CEA_1920X1080I60,77};78 79static const struct gs_reg_fmt reg_fmt[] = {80	{ 0x00, V4L2_DV_BT_CEA_1280X720P60 },81	{ 0x01, V4L2_DV_BT_CEA_1280X720P60 },82	{ 0x02, V4L2_DV_BT_CEA_1280X720P30 },83	{ 0x03, V4L2_DV_BT_CEA_1280X720P30 },84	{ 0x04, V4L2_DV_BT_CEA_1280X720P50 },85	{ 0x05, V4L2_DV_BT_CEA_1280X720P50 },86	{ 0x06, V4L2_DV_BT_CEA_1280X720P25 },87	{ 0x07, V4L2_DV_BT_CEA_1280X720P25 },88	{ 0x08, V4L2_DV_BT_CEA_1280X720P24 },89	{ 0x09, V4L2_DV_BT_CEA_1280X720P24 },90	{ 0x0A, V4L2_DV_BT_CEA_1920X1080I60 },91	{ 0x0B, V4L2_DV_BT_CEA_1920X1080P30 },92 93	/* Default value: keep this field before 0xC */94	{ 0x14, V4L2_DV_BT_CEA_1920X1080I50 },95	{ 0x0C, V4L2_DV_BT_CEA_1920X1080I50 },96	{ 0x0D, V4L2_DV_BT_CEA_1920X1080P25 },97	{ 0x0E, V4L2_DV_BT_CEA_1920X1080P25 },98	{ 0x10, V4L2_DV_BT_CEA_1920X1080P24 },99	{ 0x12, V4L2_DV_BT_CEA_1920X1080P24 },100	{ 0x16, V4L2_DV_BT_SDI_720X487I60 },101	{ 0x19, V4L2_DV_BT_SDI_720X487I60 },102	{ 0x18, V4L2_DV_BT_CEA_720X576P50 },103	{ 0x1A, V4L2_DV_BT_CEA_720X576P50 },104 105	/* Implement following timings before enable it.106	 * Because of we don't have access to these theoretical timings yet.107	 * Workaround: use functions to get and set registers for these formats.108	 */109#if 0110	{ 0x0F, V4L2_DV_BT_XXX_1920X1080I25 }, /* SMPTE 274M */111	{ 0x11, V4L2_DV_BT_XXX_1920X1080I24 }, /* SMPTE 274M */112	{ 0x13, V4L2_DV_BT_XXX_1920X1080I25 }, /* SMPTE 274M */113	{ 0x15, V4L2_DV_BT_XXX_1920X1035I60 }, /* SMPTE 260M */114	{ 0x17, V4L2_DV_BT_SDI_720X507I60 }, /* SMPTE 125M */115	{ 0x1B, V4L2_DV_BT_SDI_720X507I60 }, /* SMPTE 125M */116	{ 0x1C, V4L2_DV_BT_XXX_2048X1080P25 }, /* SMPTE 428.1M */117#endif118};119 120static const struct v4l2_dv_timings_cap gs_timings_cap = {121	.type = V4L2_DV_BT_656_1120,122	/* keep this initialization for compatibility with GCC < 4.4.6 */123	.reserved = { 0 },124	V4L2_INIT_BT_TIMINGS(GS_WIDTH_MIN, GS_WIDTH_MAX, GS_HEIGHT_MIN,125			     GS_HEIGHT_MAX, GS_PIXELCLOCK_MIN,126			     GS_PIXELCLOCK_MAX,127			     V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_SDI,128			     V4L2_DV_BT_CAP_PROGRESSIVE129			     | V4L2_DV_BT_CAP_INTERLACED)130};131 132static int gs_read_register(struct spi_device *spi, u16 addr, u16 *value)133{134	int ret;135	u16 buf_addr = (0x8000 | (0x0FFF & addr));136	u16 buf_value = 0;137	struct spi_message msg;138	struct spi_transfer tx[] = {139		{140			.tx_buf = &buf_addr,141			.len = 2,142			.delay = {143				.value = 1,144				.unit = SPI_DELAY_UNIT_USECS145			},146		}, {147			.rx_buf = &buf_value,148			.len = 2,149			.delay = {150				.value = 1,151				.unit = SPI_DELAY_UNIT_USECS152			},153		},154	};155 156	spi_message_init(&msg);157	spi_message_add_tail(&tx[0], &msg);158	spi_message_add_tail(&tx[1], &msg);159	ret = spi_sync(spi, &msg);160 161	*value = buf_value;162 163	return ret;164}165 166static int gs_write_register(struct spi_device *spi, u16 addr, u16 value)167{168	int ret;169	u16 buf_addr = addr;170	u16 buf_value = value;171	struct spi_message msg;172	struct spi_transfer tx[] = {173		{174			.tx_buf = &buf_addr,175			.len = 2,176			.delay = {177				.value = 1,178				.unit = SPI_DELAY_UNIT_USECS179			},180		}, {181			.tx_buf = &buf_value,182			.len = 2,183			.delay = {184				.value = 1,185				.unit = SPI_DELAY_UNIT_USECS186			},187		},188	};189 190	spi_message_init(&msg);191	spi_message_add_tail(&tx[0], &msg);192	spi_message_add_tail(&tx[1], &msg);193	ret = spi_sync(spi, &msg);194 195	return ret;196}197 198#ifdef CONFIG_VIDEO_ADV_DEBUG199static int gs_g_register(struct v4l2_subdev *sd,200		  struct v4l2_dbg_register *reg)201{202	struct spi_device *spi = v4l2_get_subdevdata(sd);203	u16 val;204	int ret;205 206	ret = gs_read_register(spi, reg->reg & 0xFFFF, &val);207	reg->val = val;208	reg->size = 2;209	return ret;210}211 212static int gs_s_register(struct v4l2_subdev *sd,213		  const struct v4l2_dbg_register *reg)214{215	struct spi_device *spi = v4l2_get_subdevdata(sd);216 217	return gs_write_register(spi, reg->reg & 0xFFFF, reg->val & 0xFFFF);218}219#endif220 221static int gs_status_format(u16 status, struct v4l2_dv_timings *timings)222{223	int std = (status & MASK_STD_STATUS) >> 5;224	int i;225 226	for (i = 0; i < ARRAY_SIZE(reg_fmt); i++) {227		if (reg_fmt[i].reg_value == std) {228			*timings = reg_fmt[i].format;229			return 0;230		}231	}232 233	return -ERANGE;234}235 236static u16 get_register_timings(struct v4l2_dv_timings *timings)237{238	int i;239 240	for (i = 0; i < ARRAY_SIZE(reg_fmt); i++) {241		if (v4l2_match_dv_timings(timings, &reg_fmt[i].format, 0,242					  false))243			return reg_fmt[i].reg_value | MASK_FORCE_STD;244	}245 246	return 0x0;247}248 249static inline struct gs *to_gs(struct v4l2_subdev *sd)250{251	return container_of(sd, struct gs, sd);252}253 254static int gs_s_dv_timings(struct v4l2_subdev *sd, unsigned int pad,255			   struct v4l2_dv_timings *timings)256{257	struct gs *gs = to_gs(sd);258	int reg_value;259 260	if (pad != 0)261		return -EINVAL;262 263	reg_value = get_register_timings(timings);264	if (reg_value == 0x0)265		return -EINVAL;266 267	gs->current_timings = *timings;268	return 0;269}270 271static int gs_g_dv_timings(struct v4l2_subdev *sd, unsigned int pad,272			   struct v4l2_dv_timings *timings)273{274	struct gs *gs = to_gs(sd);275 276	if (pad != 0)277		return -EINVAL;278 279	*timings = gs->current_timings;280	return 0;281}282 283static int gs_query_dv_timings(struct v4l2_subdev *sd, unsigned int pad,284			       struct v4l2_dv_timings *timings)285{286	struct gs *gs = to_gs(sd);287	struct v4l2_dv_timings fmt;288	u16 reg_value, i;289	int ret;290 291	if (pad != 0)292		return -EINVAL;293 294	if (gs->enabled)295		return -EBUSY;296 297	/*298	 * Check if the component detect a line, a frame or something else299	 * which looks like a video signal activity.300	 */301	for (i = 0; i < 4; i++) {302		gs_read_register(gs->pdev, REG_LINES_PER_FRAME + i, &reg_value);303		if (reg_value)304			break;305	}306 307	/* If no register reports a video signal */308	if (i >= 4)309		return -ENOLINK;310 311	gs_read_register(gs->pdev, REG_STATUS, &reg_value);312	if (!(reg_value & MASK_H_LOCK) || !(reg_value & MASK_V_LOCK))313		return -ENOLCK;314	if (!(reg_value & MASK_STD_LOCK))315		return -ERANGE;316 317	ret = gs_status_format(reg_value, &fmt);318 319	if (ret < 0)320		return ret;321 322	*timings = fmt;323	return 0;324}325 326static int gs_enum_dv_timings(struct v4l2_subdev *sd,327		       struct v4l2_enum_dv_timings *timings)328{329	if (timings->index >= ARRAY_SIZE(fmt_cap))330		return -EINVAL;331 332	if (timings->pad != 0)333		return -EINVAL;334 335	timings->timings = fmt_cap[timings->index];336	return 0;337}338 339static int gs_s_stream(struct v4l2_subdev *sd, int enable)340{341	struct gs *gs = to_gs(sd);342	int reg_value;343 344	if (gs->enabled == enable)345		return 0;346 347	gs->enabled = enable;348 349	if (enable) {350		/* To force the specific format */351		reg_value = get_register_timings(&gs->current_timings);352		return gs_write_register(gs->pdev, REG_FORCE_FMT, reg_value);353	}354 355	/* To renable auto-detection mode */356	return gs_write_register(gs->pdev, REG_FORCE_FMT, 0x0);357}358 359static int gs_g_input_status(struct v4l2_subdev *sd, u32 *status)360{361	struct gs *gs = to_gs(sd);362	u16 reg_value, i;363	int ret;364 365	/*366	 * Check if the component detect a line, a frame or something else367	 * which looks like a video signal activity.368	 */369	for (i = 0; i < 4; i++) {370		ret = gs_read_register(gs->pdev,371				       REG_LINES_PER_FRAME + i, &reg_value);372		if (reg_value)373			break;374		if (ret) {375			*status = V4L2_IN_ST_NO_POWER;376			return ret;377		}378	}379 380	/* If no register reports a video signal */381	if (i >= 4)382		*status |= V4L2_IN_ST_NO_SIGNAL;383 384	ret = gs_read_register(gs->pdev, REG_STATUS, &reg_value);385	if (!(reg_value & MASK_H_LOCK))386		*status |=  V4L2_IN_ST_NO_H_LOCK;387	if (!(reg_value & MASK_V_LOCK))388		*status |=  V4L2_IN_ST_NO_V_LOCK;389	if (!(reg_value & MASK_STD_LOCK))390		*status |=  V4L2_IN_ST_NO_STD_LOCK;391 392	return ret;393}394 395static int gs_dv_timings_cap(struct v4l2_subdev *sd,396			     struct v4l2_dv_timings_cap *cap)397{398	if (cap->pad != 0)399		return -EINVAL;400 401	*cap = gs_timings_cap;402	return 0;403}404 405/* V4L2 core operation handlers */406static const struct v4l2_subdev_core_ops gs_core_ops = {407#ifdef CONFIG_VIDEO_ADV_DEBUG408	.g_register = gs_g_register,409	.s_register = gs_s_register,410#endif411};412 413static const struct v4l2_subdev_video_ops gs_video_ops = {414	.s_stream = gs_s_stream,415	.g_input_status = gs_g_input_status,416};417 418static const struct v4l2_subdev_pad_ops gs_pad_ops = {419	.s_dv_timings = gs_s_dv_timings,420	.g_dv_timings = gs_g_dv_timings,421	.query_dv_timings = gs_query_dv_timings,422	.enum_dv_timings = gs_enum_dv_timings,423	.dv_timings_cap = gs_dv_timings_cap,424};425 426/* V4L2 top level operation handlers */427static const struct v4l2_subdev_ops gs_ops = {428	.core = &gs_core_ops,429	.video = &gs_video_ops,430	.pad = &gs_pad_ops,431};432 433static int gs_probe(struct spi_device *spi)434{435	int ret;436	struct gs *gs;437	struct v4l2_subdev *sd;438 439	gs = devm_kzalloc(&spi->dev, sizeof(struct gs), GFP_KERNEL);440	if (!gs)441		return -ENOMEM;442 443	gs->pdev = spi;444	sd = &gs->sd;445 446	spi->mode = SPI_MODE_0;447	spi->irq = -1;448	spi->max_speed_hz = 10000000;449	spi->bits_per_word = 16;450	ret = spi_setup(spi);451	v4l2_spi_subdev_init(sd, spi, &gs_ops);452 453	gs->current_timings = reg_fmt[0].format;454	gs->enabled = 0;455 456	/* Set H_CONFIG to SMPTE timings */457	gs_write_register(spi, 0x0, 0x300);458 459	return ret;460}461 462static void gs_remove(struct spi_device *spi)463{464	struct v4l2_subdev *sd = spi_get_drvdata(spi);465 466	v4l2_device_unregister_subdev(sd);467}468 469static struct spi_driver gs_driver = {470	.driver = {471		.name		= "gs1662",472	},473 474	.probe		= gs_probe,475	.remove		= gs_remove,476	.id_table	= gs_id,477};478 479module_spi_driver(gs_driver);480 481MODULE_LICENSE("GPL");482MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@nexvision.fr>");483MODULE_DESCRIPTION("Gennum GS1662 HD/SD-SDI Serializer driver");484