- 根目录:
- drivers
- media
- i2c
- ths8200.c
/*
* ths8200 - Texas Instruments THS8200 video encoder driver
*
* Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed .as is. WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/v4l2-dv-timings.h>
#include <media/v4l2-dv-timings.h>
#include <media/v4l2-async.h>
#include <media/v4l2-device.h>
#include "ths8200_regs.h"
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "debug level (0-2)");
MODULE_DESCRIPTION("Texas Instruments THS8200 video encoder driver");
MODULE_AUTHOR("Mats Randgaard <mats.randgaard@cisco.com>");
MODULE_AUTHOR("Martin Bugge <martin.bugge@cisco.com>");
MODULE_LICENSE("GPL v2");
struct ths8200_state {
struct v4l2_subdev sd;
uint8_t chip_version;
/* Is the ths8200 powered on? */
bool power_on;
struct v4l2_dv_timings dv_timings;
};
static const struct v4l2_dv_timings_cap ths8200_timings_cap = {
.type = V4L2_DV_BT_656_1120,
/* keep this initialization for compatibility with GCC < 4.4.6 */
.reserved = { 0 },
V4L2_INIT_BT_TIMINGS(0, 1920, 0, 1080, 25000000, 148500000,
V4L2_DV_BT_STD_CEA861, V4L2_DV_BT_CAP_PROGRESSIVE)
};
static inline struct ths8200_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct ths8200_state, sd);
}
static inline unsigned htotal(const struct v4l2_bt_timings *t)
{
return V4L2_DV_BT_FRAME_WIDTH(t);
}
static inline unsigned vtotal(const struct v4l2_bt_timings *t)
{
return V4L2_DV_BT_FRAME_HEIGHT(t);
}
static int ths8200_read(struct v4l2_subdev *sd, u8 reg)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return i2c_smbus_read_byte_data(client, reg);
}
static int ths8200_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
int i;
for (i = 0; i < 3; i++) {
ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret == 0)
return 0;
}
v4l2_err(sd, "I2C Write Problem\n");
return ret;
}
/* To set specific bits in the register, a clear-mask is given (to be AND-ed),
* and then the value-mask (to be OR-ed).
*/
static inline void
ths8200_write_and_or(struct v4l2_subdev *sd, u8 reg,
uint8_t clr_mask, uint8_t val_mask)
{
ths8200_write(sd, reg, (ths8200_read(sd, reg) & clr_mask) | val_mask);
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ths8200_g_register(struct v4l2_subdev *sd,
struct v4l2_dbg_register *reg)
{
reg->val = ths8200_read(sd, reg->reg & 0xff);
reg->size = 1;
return 0;
}
static int ths8200_s_register(struct v4l2_subdev *sd,
const struct v4l2_dbg_register *reg)
{
ths8200_write(sd, reg->reg & 0xff, reg->val & 0xff);
return 0;
}
#endif
static int ths8200_log_status(struct v4l2_subdev *sd)
{
struct ths8200_state *state = to_state(sd);
uint8_t reg_03 = ths8200_read(sd, THS8200_CHIP_CTL);
v4l2_info(sd, "----- Chip status -----\n");
v4l2_info(sd, "version: %u\n", state->chip_version);
v4l2_info(sd, "power: %s\n", (reg_03 & 0x0c) ? "off" : "on");
v4l2_info(sd, "reset: %s\n", (reg_03 & 0x01) ? "off" : "on");
v4l2_info(sd, "test pattern: %s\n",
(reg_03 & 0x20) ? "enabled" : "disabled");
v4l2_info(sd, "format: %ux%u\n",
ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_MSB) * 256 +
ths8200_read(sd, THS8200_DTG2_PIXEL_CNT_LSB),
(ths8200_read(sd, THS8200_DTG2_LINE_CNT_MSB) & 0x07) * 256 +
ths8200_read(sd, THS8200_DTG2_LINE_CNT_LSB));
v4l2_print_dv_timings(sd->name, "Configured format:",
&state->dv_timings, true);
return 0;
}
/* Power up/down ths8200 */
static int ths8200_s_power(struct v4l2_subdev *sd, int on)
{
struct ths8200_state *state = to_state(sd);
v4l2_dbg(1, debug, sd, "%s: power %s\n", __func__, on ? "on" : "off");
state->power_on = on;
/* Power up/down - leave in reset state until input video is present */
ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xf2, (on ? 0x00 : 0x0c));
return 0;
}
static const struct v4l2_subdev_core_ops ths8200_core_ops = {
.log_status = ths8200_log_status,
.s_power = ths8200_s_power,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = ths8200_g_register,
.s_register = ths8200_s_register,
#endif
};
/* -----------------------------------------------------------------------------
* V4L2 subdev video operations
*/
static int ths8200_s_stream(struct v4l2_subdev *sd, int enable)
{
struct ths8200_state *state = to_state(sd);
if (enable && !state->power_on)
ths8200_s_power(sd, true);
ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0xfe,
(enable ? 0x01 : 0x00));
v4l2_dbg(1, debug, sd, "%s: %sable\n",
__func__, (enable ? "en" : "dis"));
return 0;
}
static void ths8200_core_init(struct v4l2_subdev *sd)
{
/* setup clocks */
ths8200_write_and_or(sd, THS8200_CHIP_CTL, 0x3f, 0xc0);
/**** Data path control (DATA) ****/
/* Set FSADJ 700 mV,
* bypass 422-444 interpolation,
* input format 30 bit RGB444
*/
ths8200_write(sd, THS8200_DATA_CNTL, 0x70);
/* DTG Mode (Video blocked during blanking
* VESA slave
*/
ths8200_write(sd, THS8200_DTG1_MODE, 0x87);
/**** Display Timing Generator Control, Part 1 (DTG1). ****/
/* Disable embedded syncs on the output by setting
* the amplitude to zero for all channels.
*/
ths8200_write(sd, THS8200_DTG1_Y_SYNC_MSB, 0x00);
ths8200_write(sd, THS8200_DTG1_CBCR_SYNC_MSB, 0x00);
}
static void ths8200_setup(struct v4l2_subdev *sd, struct v4l2_bt_timings *bt)
{
uint8_t polarity = 0;
uint16_t line_start_active_video = (bt->vsync + bt->vbackporch);
uint16_t line_start_front_porch = (vtotal(bt) - bt->vfrontporch);
/*** System ****/
/* Set chip in reset while it is configured */
ths8200_s_stream(sd, false);
/* configure video output timings */
ths8200_write(sd, THS8200_DTG1_SPEC_A, bt->hsync);
ths8200_write(sd, THS8200_DTG1_SPEC_B, bt->hfrontporch);
/* Zero for progressive scan formats.*/
if (!bt->interlaced)
ths8200_write(sd, THS8200_DTG1_SPEC_C, 0x00);
/* Distance from leading edge of h sync to start of active video.
* MSB in 0x2b
*/
ths8200_write(sd, THS8200_DTG1_SPEC_D_LSB,
(bt->hbackporch + bt->hsync) & 0xff);
/* Zero for SDTV-mode. MSB in 0x2b */
ths8200_write(sd, THS8200_DTG1_SPEC_E_LSB, 0x00);
/*
* MSB for dtg1_spec(d/e/h). See comment for
* corresponding LSB registers.
*/
ths8200_write(sd, THS8200_DTG1_SPEC_DEH_MSB,
((bt->hbackporch + bt->hsync) & 0x100) >> 1);
/* h front porch */
ths8200_write(sd, THS8200_DTG1_SPEC_K_LSB, (bt->hfrontporch) & 0xff);
ths8200_write(sd, THS8200_DTG1_SPEC_K_MSB,
((bt->hfrontporch) & 0x700) >> 8);
/* Half the line length. Used to calculate SDTV line types. */
ths8200_write(sd, THS8200_DTG1_SPEC_G_LSB, (htotal(bt)/2) & 0xff);
ths8200_write(sd, THS8200_DTG1_SPEC_G_MSB,
((htotal(bt)/2) >> 8) & 0x0f);
/* Total pixels per line (ex. 720p: 1650) */
ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_MSB, htotal(bt) >> 8);
ths8200_write(sd, THS8200_DTG1_TOT_PIXELS_LSB, htotal(bt) & 0xff);
/* Frame height and field height */
/* Field height should be programmed higher than frame_size for
* progressive scan formats
*/
ths8200_write(sd, THS8200_DTG1_FRAME_FIELD_SZ_MSB,
((vtotal(bt) >> 4) & 0xf0) + 0x7);
ths8200_write(sd, THS8200_DTG1_FRAME_SZ_LSB, vtotal(bt) & 0xff);
/* Should be programmed higher than frame_size
* for progressive formats
*/
if (!bt->interlaced)
ths8200_write(sd, THS8200_DTG1_FIELD_SZ_LSB, 0xff);
/**** Display Timing Generator Control, Part 2 (DTG2). ****/
/* Set breakpoint line numbers and types
* THS8200 generates line types with different properties. A line type
* that sets all the RGB-outputs to zero is used in the blanking areas,
* while a line type that enable the RGB-outputs is used in active video
* area. The line numbers for start of active video, start of front
* porch and after the last line in the frame must be set with the
* corresponding line types.
*
* Line types:
* 0x9 - Full normal sync pulse: Blocks data when dtg1_pass is off.
* Used in blanking area.
* 0x0 - Active video: Video data is always passed. Used in active
* video area.
*/
ths8200_write_and_or(sd, THS8200_DTG2_BP1_2_MSB, 0x88,
((line_start_active_video >> 4) & 0x70) +
((line_start_front_porch >> 8) & 0x07));
ths8200_write(sd, THS8200_DTG2_BP3_4_MSB, ((vtotal(bt)) >> 4) & 0x70);
ths8200_write(sd, THS8200_DTG2_BP1_LSB, line_start_active_video & 0xff);
ths8200_write(sd, THS8200_DTG2_BP2_LSB, line_start_front_porch & 0xff);
ths8200_write(sd, THS8200_DTG2_BP3_LSB, (vtotal(bt)) & 0xff);
/* line types */
ths8200_write(sd, THS8200_DTG2_LINETYPE1, 0x90);
ths8200_write(sd, THS8200_DTG2_LINETYPE2, 0x90);
/* h sync width transmitted */
ths8200_write(sd, THS8200_DTG2_HLENGTH_LSB, bt->hsync & 0xff);
ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0x3f,
(bt->hsync >> 2) & 0xc0);
/* The pixel value h sync is asserted on */
ths8200_write_and_or(sd, THS8200_DTG2_HLENGTH_LSB_HDLY_MSB, 0xe0,
(htotal(bt) >> 8) & 0x1f);
ths8200_write(sd, THS8200_DTG2_HLENGTH_HDLY_LSB, htotal(bt));
/* v sync width transmitted (must add 1 to get correct output) */
ths8200_write(sd, THS8200_DTG2_VLENGTH1_LSB, (bt->vsync + 1) & 0xff);
ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0x3f,
((bt->vsync + 1) >> 2) & 0xc0);
/* The pixel value v sync is asserted on (must add 1 to get correct output) */
ths8200_write_and_or(sd, THS8200_DTG2_VLENGTH1_MSB_VDLY1_MSB, 0xf8,
((vtotal(bt) + 1) >> 8) & 0x7);
ths8200_write(sd, THS8200_DTG2_VDLY1_LSB, vtotal(bt) + 1);
/* For progressive video vlength2 must be set to all 0 and vdly2 must
* be set to all 1.
*/
ths8200_write(sd, THS8200_DTG2_VLENGTH2_LSB, 0x00);
ths8200_write(sd, THS8200_DTG2_VLENGTH2_MSB_VDLY2_MSB, 0x07);
ths8200_write(sd, THS8200_DTG2_VDLY2_LSB, 0xff);
/* Internal delay factors to synchronize the sync pulses and the data */
/* Experimental values delays (hor 0, ver 0) */
ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_MSB, 0);
ths8200_write(sd, THS8200_DTG2_HS_IN_DLY_LSB, 0);
ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_MSB, 0);
ths8200_write(sd, THS8200_DTG2_VS_IN_DLY_LSB, 0);
/* Polarity of received and transmitted sync signals */
if (bt->polarities & V4L2_DV_HSYNC_POS_POL) {
polarity |= 0x01; /* HS_IN */
polarity |= 0x08; /* HS_OUT */
}
if (bt->polarities & V4L2_DV_VSYNC_POS_POL) {
polarity |= 0x02; /* VS_IN */
polarity |= 0x10; /* VS_OUT */
}
/* RGB mode, no embedded timings */
/* Timing of video input bus is derived from HS, VS, and FID dedicated
* inputs
*/
ths8200_write(sd, THS8200_DTG2_CNTL, 0x44 | polarity);
/* leave reset */
ths8200_s_stream(sd, true);
v4l2_dbg(1, debug, sd, "%s: frame %dx%d, polarity %d\n"
"horizontal: front porch %d, back porch %d, sync %d\n"
"vertical: sync %d\n", __func__, htotal(bt), vtotal(bt),
polarity, bt->hfrontporch, bt->hbackporch,
bt->hsync, bt->vsync);
}
static int ths8200_s_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct ths8200_state *state = to_state(sd);
v4l2_dbg(1, debug, sd, "%s:\n", __func__);
if (!v4l2_valid_dv_timings(timings, &ths8200_timings_cap,
NULL, NULL))
return -EINVAL;
if (!v4l2_find_dv_timings_cap(timings, &ths8200_timings_cap, 10,
NULL, NULL)) {
v4l2_dbg(1, debug, sd, "Unsupported format\n");
return -EINVAL;
}
timings->bt.flags &= ~V4L2_DV_FL_REDUCED_FPS;
/* save timings */
state->dv_timings = *timings;
ths8200_setup(sd, &timings->bt);
return 0;
}
static int ths8200_g_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct ths8200_state *state = to_state(sd);
v4l2_dbg(1, debug, sd, "%s:\n", __func__);
*timings = state->dv_timings;
return 0;
}
static int ths8200_enum_dv_timings(struct v4l2_subdev *sd,
struct v4l2_enum_dv_timings *timings)
{
if (timings->pad != 0)
return -EINVAL;
return v4l2_enum_dv_timings_cap(timings, &ths8200_timings_cap,
NULL, NULL);
}
static int ths8200_dv_timings_cap(struct v4l2_subdev *sd,
struct v4l2_dv_timings_cap *cap)
{
if (cap->pad != 0)
return -EINVAL;
*cap = ths8200_timings_cap;
return 0;
}
/* Specific video subsystem operation handlers */
static const struct v4l2_subdev_video_ops ths8200_video_ops = {
.s_stream = ths8200_s_stream,
.s_dv_timings = ths8200_s_dv_timings,
.g_dv_timings = ths8200_g_dv_timings,
};
static const struct v4l2_subdev_pad_ops ths8200_pad_ops = {
.enum_dv_timings = ths8200_enum_dv_timings,
.dv_timings_cap = ths8200_dv_timings_cap,
};
/* V4L2 top level operation handlers */
static const struct v4l2_subdev_ops ths8200_ops = {
.core = &ths8200_core_ops,
.video = &ths8200_video_ops,
.pad = &ths8200_pad_ops,
};
static int ths8200_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ths8200_state *state;
struct v4l2_subdev *sd;
int error;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &ths8200_ops);
state->chip_version = ths8200_read(sd, THS8200_VERSION);
v4l2_dbg(1, debug, sd, "chip version 0x%x\n", state->chip_version);
ths8200_core_init(sd);
error = v4l2_async_register_subdev(&state->sd);
if (error)
return error;
v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,
client->addr << 1, client->adapter->name);
return 0;
}
static int ths8200_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ths8200_state *decoder = to_state(sd);
v4l2_dbg(1, debug, sd, "%s removed @ 0x%x (%s)\n", client->name,
client->addr << 1, client->adapter->name);
ths8200_s_power(sd, false);
v4l2_async_unregister_subdev(&decoder->sd);
return 0;
}
static struct i2c_device_id ths8200_id[] = {
{ "ths8200", 0 },
{},
};
MODULE_DEVICE_TABLE(i2c, ths8200_id);
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id ths8200_of_match[] = {
{ .compatible = "ti,ths8200", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ths8200_of_match);
#endif
static struct i2c_driver ths8200_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ths8200",
.of_match_table = of_match_ptr(ths8200_of_match),
},
.probe = ths8200_probe,
.remove = ths8200_remove,
.id_table = ths8200_id,
};
module_i2c_driver(ths8200_driver);