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linux/drivers/media/spi/gs1662.c
Uwe Kleine-König a0386bba70
spi: make remove callback a void function 
The value returned by an spi driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Claudius Heine <ch@denx.de>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Acked-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Acked-by: Łukasz Stelmach <l.stelmach@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220123175201.34839-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-02-09 13:00:45 +00:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* GS1662 device registration.
*
* Copyright (C) 2015-2016 Nexvision
* Author: Charles-Antoine Couret <charles-antoine.couret@nexvision.fr>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spi/spi.h>
#include <linux/platform_device.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-dv-timings.h>
#include <linux/v4l2-dv-timings.h>
#define REG_STATUS 0x04
#define REG_FORCE_FMT 0x06
#define REG_LINES_PER_FRAME 0x12
#define REG_WORDS_PER_LINE 0x13
#define REG_WORDS_PER_ACT_LINE 0x14
#define REG_ACT_LINES_PER_FRAME 0x15
#define MASK_H_LOCK 0x001
#define MASK_V_LOCK 0x002
#define MASK_STD_LOCK 0x004
#define MASK_FORCE_STD 0x020
#define MASK_STD_STATUS 0x3E0
#define GS_WIDTH_MIN 720
#define GS_WIDTH_MAX 2048
#define GS_HEIGHT_MIN 487
#define GS_HEIGHT_MAX 1080
#define GS_PIXELCLOCK_MIN 10519200
#define GS_PIXELCLOCK_MAX 74250000
struct gs {
struct spi_device *pdev;
struct v4l2_subdev sd;
struct v4l2_dv_timings current_timings;
int enabled;
};
struct gs_reg_fmt {
u16 reg_value;
struct v4l2_dv_timings format;
};
struct gs_reg_fmt_custom {
u16 reg_value;
__u32 width;
__u32 height;
__u64 pixelclock;
__u32 interlaced;
};
static const struct spi_device_id gs_id[] = {
{ "gs1662", 0 },
{ }
};
MODULE_DEVICE_TABLE(spi, gs_id);
static const struct v4l2_dv_timings fmt_cap[] = {
V4L2_DV_BT_SDI_720X487I60,
V4L2_DV_BT_CEA_720X576P50,
V4L2_DV_BT_CEA_1280X720P24,
V4L2_DV_BT_CEA_1280X720P25,
V4L2_DV_BT_CEA_1280X720P30,
V4L2_DV_BT_CEA_1280X720P50,
V4L2_DV_BT_CEA_1280X720P60,
V4L2_DV_BT_CEA_1920X1080P24,
V4L2_DV_BT_CEA_1920X1080P25,
V4L2_DV_BT_CEA_1920X1080P30,
V4L2_DV_BT_CEA_1920X1080I50,
V4L2_DV_BT_CEA_1920X1080I60,
};
static const struct gs_reg_fmt reg_fmt[] = {
{ 0x00, V4L2_DV_BT_CEA_1280X720P60 },
{ 0x01, V4L2_DV_BT_CEA_1280X720P60 },
{ 0x02, V4L2_DV_BT_CEA_1280X720P30 },
{ 0x03, V4L2_DV_BT_CEA_1280X720P30 },
{ 0x04, V4L2_DV_BT_CEA_1280X720P50 },
{ 0x05, V4L2_DV_BT_CEA_1280X720P50 },
{ 0x06, V4L2_DV_BT_CEA_1280X720P25 },
{ 0x07, V4L2_DV_BT_CEA_1280X720P25 },
{ 0x08, V4L2_DV_BT_CEA_1280X720P24 },
{ 0x09, V4L2_DV_BT_CEA_1280X720P24 },
{ 0x0A, V4L2_DV_BT_CEA_1920X1080I60 },
{ 0x0B, V4L2_DV_BT_CEA_1920X1080P30 },
/* Default value: keep this field before 0xC */
{ 0x14, V4L2_DV_BT_CEA_1920X1080I50 },
{ 0x0C, V4L2_DV_BT_CEA_1920X1080I50 },
{ 0x0D, V4L2_DV_BT_CEA_1920X1080P25 },
{ 0x0E, V4L2_DV_BT_CEA_1920X1080P25 },
{ 0x10, V4L2_DV_BT_CEA_1920X1080P24 },
{ 0x12, V4L2_DV_BT_CEA_1920X1080P24 },
{ 0x16, V4L2_DV_BT_SDI_720X487I60 },
{ 0x19, V4L2_DV_BT_SDI_720X487I60 },
{ 0x18, V4L2_DV_BT_CEA_720X576P50 },
{ 0x1A, V4L2_DV_BT_CEA_720X576P50 },
/* Implement following timings before enable it.
* Because of we don't have access to these theoretical timings yet.
* Workaround: use functions to get and set registers for these formats.
*/
#if 0
{ 0x0F, V4L2_DV_BT_XXX_1920X1080I25 }, /* SMPTE 274M */
{ 0x11, V4L2_DV_BT_XXX_1920X1080I24 }, /* SMPTE 274M */
{ 0x13, V4L2_DV_BT_XXX_1920X1080I25 }, /* SMPTE 274M */
{ 0x15, V4L2_DV_BT_XXX_1920X1035I60 }, /* SMPTE 260M */
{ 0x17, V4L2_DV_BT_SDI_720X507I60 }, /* SMPTE 125M */
{ 0x1B, V4L2_DV_BT_SDI_720X507I60 }, /* SMPTE 125M */
{ 0x1C, V4L2_DV_BT_XXX_2048X1080P25 }, /* SMPTE 428.1M */
#endif
};
static const struct v4l2_dv_timings_cap gs_timings_cap = {
.type = V4L2_DV_BT_656_1120,
/* keep this initialization for compatibility with GCC < 4.4.6 */
.reserved = { 0 },
V4L2_INIT_BT_TIMINGS(GS_WIDTH_MIN, GS_WIDTH_MAX, GS_HEIGHT_MIN,
GS_HEIGHT_MAX, GS_PIXELCLOCK_MIN,
GS_PIXELCLOCK_MAX,
V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_SDI,
V4L2_DV_BT_CAP_PROGRESSIVE
| V4L2_DV_BT_CAP_INTERLACED)
};
static int gs_read_register(struct spi_device *spi, u16 addr, u16 *value)
{
int ret;
u16 buf_addr = (0x8000 | (0x0FFF & addr));
u16 buf_value = 0;
struct spi_message msg;
struct spi_transfer tx[] = {
{
.tx_buf = &buf_addr,
.len = 2,
.delay = {
.value = 1,
.unit = SPI_DELAY_UNIT_USECS
},
}, {
.rx_buf = &buf_value,
.len = 2,
.delay = {
.value = 1,
.unit = SPI_DELAY_UNIT_USECS
},
},
};
spi_message_init(&msg);
spi_message_add_tail(&tx[0], &msg);
spi_message_add_tail(&tx[1], &msg);
ret = spi_sync(spi, &msg);
*value = buf_value;
return ret;
}
static int gs_write_register(struct spi_device *spi, u16 addr, u16 value)
{
int ret;
u16 buf_addr = addr;
u16 buf_value = value;
struct spi_message msg;
struct spi_transfer tx[] = {
{
.tx_buf = &buf_addr,
.len = 2,
.delay = {
.value = 1,
.unit = SPI_DELAY_UNIT_USECS
},
}, {
.tx_buf = &buf_value,
.len = 2,
.delay = {
.value = 1,
.unit = SPI_DELAY_UNIT_USECS
},
},
};
spi_message_init(&msg);
spi_message_add_tail(&tx[0], &msg);
spi_message_add_tail(&tx[1], &msg);
ret = spi_sync(spi, &msg);
return ret;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int gs_g_register(struct v4l2_subdev *sd,
struct v4l2_dbg_register *reg)
{
struct spi_device *spi = v4l2_get_subdevdata(sd);
u16 val;
int ret;
ret = gs_read_register(spi, reg->reg & 0xFFFF, &val);
reg->val = val;
reg->size = 2;
return ret;
}
static int gs_s_register(struct v4l2_subdev *sd,
const struct v4l2_dbg_register *reg)
{
struct spi_device *spi = v4l2_get_subdevdata(sd);
return gs_write_register(spi, reg->reg & 0xFFFF, reg->val & 0xFFFF);
}
#endif
static int gs_status_format(u16 status, struct v4l2_dv_timings *timings)
{
int std = (status & MASK_STD_STATUS) >> 5;
int i;
for (i = 0; i < ARRAY_SIZE(reg_fmt); i++) {
if (reg_fmt[i].reg_value == std) {
*timings = reg_fmt[i].format;
return 0;
}
}
return -ERANGE;
}
static u16 get_register_timings(struct v4l2_dv_timings *timings)
{
int i;
for (i = 0; i < ARRAY_SIZE(reg_fmt); i++) {
if (v4l2_match_dv_timings(timings, &reg_fmt[i].format, 0,
false))
return reg_fmt[i].reg_value | MASK_FORCE_STD;
}
return 0x0;
}
static inline struct gs *to_gs(struct v4l2_subdev *sd)
{
return container_of(sd, struct gs, sd);
}
static int gs_s_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct gs *gs = to_gs(sd);
int reg_value;
reg_value = get_register_timings(timings);
if (reg_value == 0x0)
return -EINVAL;
gs->current_timings = *timings;
return 0;
}
static int gs_g_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct gs *gs = to_gs(sd);
*timings = gs->current_timings;
return 0;
}
static int gs_query_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct gs *gs = to_gs(sd);
struct v4l2_dv_timings fmt;
u16 reg_value, i;
int ret;
if (gs->enabled)
return -EBUSY;
/*
* Check if the component detect a line, a frame or something else
* which looks like a video signal activity.
*/
for (i = 0; i < 4; i++) {
gs_read_register(gs->pdev, REG_LINES_PER_FRAME + i, &reg_value);
if (reg_value)
break;
}
/* If no register reports a video signal */
if (i >= 4)
return -ENOLINK;
gs_read_register(gs->pdev, REG_STATUS, &reg_value);
if (!(reg_value & MASK_H_LOCK) || !(reg_value & MASK_V_LOCK))
return -ENOLCK;
if (!(reg_value & MASK_STD_LOCK))
return -ERANGE;
ret = gs_status_format(reg_value, &fmt);
if (ret < 0)
return ret;
*timings = fmt;
return 0;
}
static int gs_enum_dv_timings(struct v4l2_subdev *sd,
struct v4l2_enum_dv_timings *timings)
{
if (timings->index >= ARRAY_SIZE(fmt_cap))
return -EINVAL;
if (timings->pad != 0)
return -EINVAL;
timings->timings = fmt_cap[timings->index];
return 0;
}
static int gs_s_stream(struct v4l2_subdev *sd, int enable)
{
struct gs *gs = to_gs(sd);
int reg_value;
if (gs->enabled == enable)
return 0;
gs->enabled = enable;
if (enable) {
/* To force the specific format */
reg_value = get_register_timings(&gs->current_timings);
return gs_write_register(gs->pdev, REG_FORCE_FMT, reg_value);
}
/* To renable auto-detection mode */
return gs_write_register(gs->pdev, REG_FORCE_FMT, 0x0);
}
static int gs_g_input_status(struct v4l2_subdev *sd, u32 *status)
{
struct gs *gs = to_gs(sd);
u16 reg_value, i;
int ret;
/*
* Check if the component detect a line, a frame or something else
* which looks like a video signal activity.
*/
for (i = 0; i < 4; i++) {
ret = gs_read_register(gs->pdev,
REG_LINES_PER_FRAME + i, &reg_value);
if (reg_value)
break;
if (ret) {
*status = V4L2_IN_ST_NO_POWER;
return ret;
}
}
/* If no register reports a video signal */
if (i >= 4)
*status |= V4L2_IN_ST_NO_SIGNAL;
ret = gs_read_register(gs->pdev, REG_STATUS, &reg_value);
if (!(reg_value & MASK_H_LOCK))
*status |= V4L2_IN_ST_NO_H_LOCK;
if (!(reg_value & MASK_V_LOCK))
*status |= V4L2_IN_ST_NO_V_LOCK;
if (!(reg_value & MASK_STD_LOCK))
*status |= V4L2_IN_ST_NO_STD_LOCK;
return ret;
}
static int gs_dv_timings_cap(struct v4l2_subdev *sd,
struct v4l2_dv_timings_cap *cap)
{
if (cap->pad != 0)
return -EINVAL;
*cap = gs_timings_cap;
return 0;
}
/* V4L2 core operation handlers */
static const struct v4l2_subdev_core_ops gs_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = gs_g_register,
.s_register = gs_s_register,
#endif
};
static const struct v4l2_subdev_video_ops gs_video_ops = {
.s_dv_timings = gs_s_dv_timings,
.g_dv_timings = gs_g_dv_timings,
.s_stream = gs_s_stream,
.g_input_status = gs_g_input_status,
.query_dv_timings = gs_query_dv_timings,
};
static const struct v4l2_subdev_pad_ops gs_pad_ops = {
.enum_dv_timings = gs_enum_dv_timings,
.dv_timings_cap = gs_dv_timings_cap,
};
/* V4L2 top level operation handlers */
static const struct v4l2_subdev_ops gs_ops = {
.core = &gs_core_ops,
.video = &gs_video_ops,
.pad = &gs_pad_ops,
};
static int gs_probe(struct spi_device *spi)
{
int ret;
struct gs *gs;
struct v4l2_subdev *sd;
gs = devm_kzalloc(&spi->dev, sizeof(struct gs), GFP_KERNEL);
if (!gs)
return -ENOMEM;
gs->pdev = spi;
sd = &gs->sd;
spi->mode = SPI_MODE_0;
spi->irq = -1;
spi->max_speed_hz = 10000000;
spi->bits_per_word = 16;
ret = spi_setup(spi);
v4l2_spi_subdev_init(sd, spi, &gs_ops);
gs->current_timings = reg_fmt[0].format;
gs->enabled = 0;
/* Set H_CONFIG to SMPTE timings */
gs_write_register(spi, 0x0, 0x300);
return ret;
}
static void gs_remove(struct spi_device *spi)
{
struct v4l2_subdev *sd = spi_get_drvdata(spi);
v4l2_device_unregister_subdev(sd);
}
static struct spi_driver gs_driver = {
.driver = {
.name = "gs1662",
},
.probe = gs_probe,
.remove = gs_remove,
.id_table = gs_id,
};
module_spi_driver(gs_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@nexvision.fr>");
MODULE_DESCRIPTION("Gennum GS1662 HD/SD-SDI Serializer driver");
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