桥接IC lt7911d linux 驱动

lt7911d C 代码
// SPDX-License-Identifier: GPL-2.0
/*

Copyright © 2021 Rockchip Electronics Co. Ltd.
lt7911d type-c/DP to MIPI CSI-2 bridge driver.
V0.0X01.0X00 first version.
V0.0X01.0X01 add 4K30 support.
V0.0X01.0X02 add poll resolution change.

#define LT7911D_CHIPID 0x0516
#define CHIPID_REGH 0xA001
#define CHIPID_REGL 0xA000
#define I2C_EN_REG 0x80EE
#define I2C_ENABLE 0x1
#define I2C_DISABLE 0x0

#define AD_HALF_PIX_CLK 0x21
#define SOURCE_DP_RX 0x10
#define RECEIVED_INT 1

#define HTOTAL_H 0xd289
#define HTOTAL_L 0xd28a
#define HACT_H 0xd28b
#define HACT_L 0xd28c
#define HFP_H 0xd29c
#define HFP_L 0xd29d
#define HS_H 0xd294
#define HS_L 0xd295
#define HBP_H 0xd298
#define HBP_L 0xd299

#define VTOTAL_H 0xd29e
#define VTOTAL_L 0xd29f
#define VACT_H 0xd296
#define VACT_L 0xd297
#define VBP 0xd287
#define VFP 0xd288
#define VS 0xd286

#define FM_CLK_SEL 0xa034
#define FREQ_METER_H 0xb8b1
#define FREQ_METER_M 0xb8b2
#define FREQ_METER_L 0xb8b3
#define RG_MK_PRESET_SEL 0xd283

#define STREAM_CTL 0x900a
#define ENABLE_STREAM 0xbf
#define DISABLE_STREAM 0xbe

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/hdmi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/rk-camera-module.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/v4l2-dv-timings.h>
#include <linux/version.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <linux/compat.h>
#include <media/v4l2-controls_rockchip.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dv-timings.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include “lt7911d.h”

#define DRIVER_VERSION KERNEL_VERSION(0, 0x01, 0x02)

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, “debug level (0-3)”);

#define I2C_MAX_XFER_SIZE 128
#define POLL_INTERVAL_MS 1000

#define LT7911D_LINK_FREQ 400000000
#define LT7911D_PIXEL_RATE 400000000

#define LT7911D_NAME “LT7911D”

static const s64 link_freq_menu_items[] = {
LT7911D_LINK_FREQ,
};

struct lt7911d_state {
struct v4l2_fwnode_bus_mipi_csi2 bus;
struct v4l2_subdev sd;
struct media_pad pad;
struct v4l2_ctrl_handler hdl;
struct i2c_client *i2c_client;
struct mutex confctl_mutex;
struct v4l2_ctrl *detect_tx_5v_ctrl;
struct v4l2_ctrl *audio_sampling_rate_ctrl;
struct v4l2_ctrl *audio_present_ctrl;
struct v4l2_ctrl *link_freq;
struct v4l2_ctrl *pixel_rate;
struct delayed_work delayed_work_enable_hotplug;
struct delayed_work delayed_work_res_change;
struct v4l2_dv_timings timings;
struct clk *xvclk;
struct gpio_desc *reset_gpio;
struct gpio_desc *plugin_det_gpio;
struct gpio_desc *power_gpio;
struct work_struct work_i2c_poll;
struct timer_list timer;
const char *module_facing;
const char *module_name;
const char *len_name;
const struct lt7911d_mode *cur_mode;
bool nosignal;
bool enable_hdcp;
bool is_audio_present;
int plugin_irq;
u32 mbus_fmt_code;
u8 csi_lanes_in_use;
u32 module_index;
u32 audio_sampling_rate;
};

static const struct v4l2_dv_timings_cap lt7911d_timings_cap = {
.type = V4L2_DV_BT_656_1120,
.reserved = { 0 },
V4L2_INIT_BT_TIMINGS(1, 10000, 1, 10000, 0, 400000000,
V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
V4L2_DV_BT_STD_GTF | V4L2_DV_BT_STD_CVT,
V4L2_DV_BT_CAP_PROGRESSIVE | V4L2_DV_BT_CAP_INTERLACED |
V4L2_DV_BT_CAP_REDUCED_BLANKING |
V4L2_DV_BT_CAP_CUSTOM)
};

struct lt7911d_mode {
u32 width;
u32 height;
struct v4l2_fract max_fps;
u32 hts_def;
u32 vts_def;
u32 exp_def;
};

static const struct lt7911d_mode supported_modes[] = {
{
.width = 3840,
.height = 2160,
.max_fps = {
.numerator = 10000,
.denominator = 300000,
},
.hts_def = 4400,
.vts_def = 2250,
}, {
.width = 1920,
.height = 1080,
.max_fps = {
.numerator = 10000,
.denominator = 600000,
},
.hts_def = 2200,
.vts_def = 1125,
}, {
.width = 1280,
.height = 720,
.max_fps = {
.numerator = 10000,
.denominator = 600000,
},
.hts_def = 1650,
.vts_def = 750,
}, {
.width = 720,
.height = 576,
.max_fps = {
.numerator = 10000,
.denominator = 500000,
},
.hts_def = 864,
.vts_def = 625,
}, {
.width = 720,
.height = 480,
.max_fps = {
.numerator = 10000,
.denominator = 600000,
},
.hts_def = 858,
.vts_def = 525,
},
};

static void lt7911d_format_change(struct v4l2_subdev *sd);
static int lt7911d_s_ctrl_detect_tx_5v(struct v4l2_subdev *sd);
static int lt7911d_s_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings);

static inline struct lt7911d_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct lt7911d_state, sd);
}

static void i2c_rd(struct v4l2_subdev *sd, u16 reg, u8 *values, u32 n)
{
struct lt7911d_state *lt7911d = to_state(sd);
struct i2c_client *client = lt7911d->i2c_client;
int err;
u8 buf[2] = { 0xFF, reg >> 8};
u8 reg_addr = reg & 0xFF;
struct i2c_msg msgs[3];

msgs[0].addr = client->addr;
msgs[0].flags = 0;
msgs[0].len = 2;
msgs[0].buf = buf;msgs[1].addr = client->addr;
msgs[1].flags = 0;
msgs[1].len = 1;
msgs[1].buf = &reg_addr;msgs[2].addr = client->addr;
msgs[2].flags = I2C_M_RD;
msgs[2].len = n;
msgs[2].buf = values;err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (err != ARRAY_SIZE(msgs)) {v4l2_err(sd, "%s: reading register 0x%x from 0x%x failed\n",__func__, reg, client->addr);
}if (!debug)return;switch (n) {
case 1:v4l2_info(sd, "I2C read 0x%04x = 0x%02x\n",reg, values[0]);break;
case 2:v4l2_info(sd, "I2C read 0x%04x = 0x%02x%02x\n",reg, values[1], values[0]);break;
case 4:v4l2_info(sd, "I2C read 0x%04x = 0x%02x%02x%02x%02x\n",reg, values[3], values[2], values[1], values[0]);break;
default:v4l2_info(sd, "I2C read %d bytes from address 0x%04x\n",n, reg);
}

}

static void i2c_wr(struct v4l2_subdev *sd, u16 reg, u8 *values, u32 n)
{
struct lt7911d_state *lt7911d = to_state(sd);
struct i2c_client *client = lt7911d->i2c_client;
int err, i;
struct i2c_msg msgs[2];
u8 data[I2C_MAX_XFER_SIZE];
u8 buf[2] = { 0xFF, reg >> 8};

if ((1 + n) > I2C_MAX_XFER_SIZE) {n = I2C_MAX_XFER_SIZE - 1;v4l2_warn(sd, "i2c wr reg=%04x: len=%d is too big!\n",reg, 1 + n);
}msgs[0].addr = client->addr;
msgs[0].flags = 0;
msgs[0].len = 2;
msgs[0].buf = buf;msgs[1].addr = client->addr;
msgs[1].flags = 0;
msgs[1].len = 1 + n;
msgs[1].buf = data;data[0] = reg & 0xff;
for (i = 0; i < n; i++)data[1 + i] = values[i];err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (err < 0) {v4l2_err(sd, "%s: writing register 0x%x from 0x%x failed\n",__func__, reg, client->addr);return;
}if (!debug)return;switch (n) {
case 1:v4l2_info(sd, "I2C write 0x%04x = 0x%02x\n",reg, data[1]);break;
case 2:v4l2_info(sd, "I2C write 0x%04x = 0x%02x%02x\n",reg, data[2], data[1]);break;
case 4:v4l2_info(sd, "I2C write 0x%04x = 0x%02x%02x%02x%02x\n",reg, data[4], data[3], data[2], data[1]);break;
default:v4l2_info(sd, "I2C write %d bytes from address 0x%04x\n",n, reg);
}

}

static u8 i2c_rd8(struct v4l2_subdev *sd, u16 reg)
{
u32 val;

i2c_rd(sd, reg, (u8 __force *)&val, 1);
return val;

}

static void i2c_wr8(struct v4l2_subdev *sd, u16 reg, u8 val)
{
i2c_wr(sd, reg, &val, 1);
}

static void lt7911d_i2c_enable(struct v4l2_subdev *sd)
{
i2c_wr8(sd, I2C_EN_REG, I2C_ENABLE);
}

static void lt7911d_i2c_disable(struct v4l2_subdev *sd)
{
i2c_wr8(sd, I2C_EN_REG, I2C_DISABLE);
}

static inline bool tx_5v_power_present(struct v4l2_subdev *sd)
{
bool ret;
int val, i, cnt;
struct lt7911d_state *lt7911d = to_state(sd);

/* if not use plugin det gpio */
if (!lt7911d->plugin_det_gpio)return true;cnt = 0;
for (i = 0; i < 5; i++) {val = gpiod_get_value(lt7911d->plugin_det_gpio);if (val > 0)cnt++;usleep_range(500, 600);
}ret = (cnt >= 3) ? true : false;
v4l2_dbg(1, debug, sd, "%s: %d\n", __func__, ret);return ret;

}

static inline bool no_signal(struct v4l2_subdev *sd)
{
struct lt7911d_state *lt7911d = to_state(sd);

v4l2_dbg(1, debug, sd, "%s no signal:%d\n", __func__,lt7911d->nosignal);return lt7911d->nosignal;

}

static inline bool audio_present(struct v4l2_subdev *sd)
{
struct lt7911d_state *lt7911d = to_state(sd);

return lt7911d->is_audio_present;

}

static int get_audio_sampling_rate(struct v4l2_subdev *sd)
{
static const int code_to_rate[] = {
44100, 0, 48000, 32000, 22050, 384000, 24000, 352800,
88200, 768000, 96000, 705600, 176400, 0, 192000, 0
};

if (no_signal(sd))return 0;return code_to_rate[2];

}

static inline unsigned int fps_calc(const struct v4l2_bt_timings *t)
{
if (!V4L2_DV_BT_FRAME_HEIGHT(t) || !V4L2_DV_BT_FRAME_WIDTH(t))
return 0;

return DIV_ROUND_CLOSEST((unsigned int)t->pixelclock,V4L2_DV_BT_FRAME_HEIGHT(t) * V4L2_DV_BT_FRAME_WIDTH(t));

}

static bool lt7911d_rcv_supported_res(struct v4l2_subdev *sd, u32 width,
u32 height)
{
u32 i;

for (i = 0; i < ARRAY_SIZE(supported_modes); i++) {if ((supported_modes[i].width == width) &&(supported_modes[i].height == height)) {break;}
}if (i == ARRAY_SIZE(supported_modes)) {v4l2_err(sd, "%s do not support res wxh: %dx%d\n", __func__,width, height);return false;
} else {return true;
}

}

static int lt7911d_get_detected_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct lt7911d_state *lt7911d = to_state(sd);
struct v4l2_bt_timings *bt = &timings->bt;
u32 hact, vact, htotal, vtotal;
u32 hbp, hs, hfp, vbp, vs, vfp;
u32 pixel_clock, fps, halt_pix_clk;
u8 clk_h, clk_m, clk_l;
u8 value, val_h, val_l;

memset(timings, 0, sizeof(struct v4l2_dv_timings));lt7911d_i2c_enable(sd);
i2c_wr8(sd, FM_CLK_SEL, AD_HALF_PIX_CLK);
mdelay(10);
clk_h = i2c_rd8(sd, FREQ_METER_H);
clk_m = i2c_rd8(sd, FREQ_METER_M);
clk_l = i2c_rd8(sd, FREQ_METER_L);
halt_pix_clk = (((clk_h & 0xf) << 16) | (clk_m << 8) | clk_l);
pixel_clock = halt_pix_clk * 2 * 1000;i2c_wr8(sd, RG_MK_PRESET_SEL, SOURCE_DP_RX);
mdelay(10);
val_h = i2c_rd8(sd, HTOTAL_H);
val_l = i2c_rd8(sd, HTOTAL_L);
htotal = ((val_h << 8) | val_l) * 2;
val_h = i2c_rd8(sd, VTOTAL_H);
val_l = i2c_rd8(sd, VTOTAL_L);
vtotal = (val_h << 8) | val_l;
val_h = i2c_rd8(sd, HACT_H);
val_l = i2c_rd8(sd, HACT_L);
hact = ((val_h << 8) | val_l) * 2;
val_h = i2c_rd8(sd, VACT_H);
val_l = i2c_rd8(sd, VACT_L);
vact = (val_h << 8) | val_l;
val_h = i2c_rd8(sd, HS_H);
val_l = i2c_rd8(sd, HS_L);
hs = ((val_h << 8) | val_l) * 2;
value = i2c_rd8(sd, VS);
vs = value;
val_h = i2c_rd8(sd, HFP_H);
val_l = i2c_rd8(sd, HFP_L);
hfp = ((val_h << 8) | val_l) * 2;
value = i2c_rd8(sd, VFP);
vfp = value;
val_h = i2c_rd8(sd, HBP_H);
val_l = i2c_rd8(sd, HBP_L);
hbp = ((val_h << 8) | val_l) * 2;
value = i2c_rd8(sd, VBP);
vbp = value;lt7911d_i2c_disable(sd);if (!lt7911d_rcv_supported_res(sd, hact, vact)) {lt7911d->nosignal = true;v4l2_err(sd, "%s: rcv err res, return no signal!\n", __func__);return -EINVAL;
}lt7911d->nosignal = false;
lt7911d->is_audio_present = true;
timings->type = V4L2_DV_BT_656_1120;
bt->interlaced = V4L2_DV_PROGRESSIVE;
bt->width = hact;
bt->height = vact;
bt->vsync = vs;
bt->hsync = hs;
bt->pixelclock = pixel_clock;
bt->hfrontporch = hfp;
bt->vfrontporch = vfp;
bt->hbackporch = hbp;
bt->vbackporch = vbp;
fps = fps_calc(bt);v4l2_info(sd, "act:%dx%d, total:%dx%d, pixclk:%d, fps:%d\n",hact, vact, htotal, vtotal, pixel_clock, fps);
v4l2_info(sd, "hfp:%d, hs:%d, hbp:%d, vfp:%d, vs:%d, vbp:%d\n",bt->hfrontporch, bt->hsync, bt->hbackporch,bt->vfrontporch, bt->vsync, bt->vbackporch);
v4l2_info(sd, "inerlaced:%d,\n", bt->interlaced);return 0;

}

static void lt7911d_delayed_work_enable_hotplug(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct lt7911d_state *lt7911d = container_of(dwork,
struct lt7911d_state, delayed_work_enable_hotplug);
struct v4l2_subdev *sd = &lt7911d->sd;

v4l2_ctrl_s_ctrl(lt7911d->detect_tx_5v_ctrl, tx_5v_power_present(sd));

}

static void lt7911d_delayed_work_res_change(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct lt7911d_state *lt7911d = container_of(dwork,
struct lt7911d_state, delayed_work_res_change);
struct v4l2_subdev *sd = &lt7911d->sd;

lt7911d_format_change(sd);

}

static int lt7911d_s_ctrl_detect_tx_5v(struct v4l2_subdev *sd)
{
struct lt7911d_state *lt7911d = to_state(sd);

return v4l2_ctrl_s_ctrl(lt7911d->detect_tx_5v_ctrl,tx_5v_power_present(sd));

}

static int lt7911d_s_ctrl_audio_sampling_rate(struct v4l2_subdev *sd)
{
struct lt7911d_state *lt7911d = to_state(sd);

return v4l2_ctrl_s_ctrl(lt7911d->audio_sampling_rate_ctrl,get_audio_sampling_rate(sd));

}

static int lt7911d_s_ctrl_audio_present(struct v4l2_subdev *sd)
{
struct lt7911d_state *lt7911d = to_state(sd);

return v4l2_ctrl_s_ctrl(lt7911d->audio_present_ctrl,audio_present(sd));

}

static int lt7911d_update_controls(struct v4l2_subdev *sd)
{
int ret = 0;

ret |= lt7911d_s_ctrl_detect_tx_5v(sd);
ret |= lt7911d_s_ctrl_audio_sampling_rate(sd);
ret |= lt7911d_s_ctrl_audio_present(sd);return ret;

}

static inline void enable_stream(struct v4l2_subdev *sd, bool enable)
{
v4l2_dbg(2, debug, sd, “%s: %sable\n”,
func, enable ? “en” : “dis”);
}

static void lt7911d_format_change(struct v4l2_subdev *sd)
{
struct lt7911d_state *lt7911d = to_state(sd);
struct v4l2_dv_timings timings;
const struct v4l2_event lt7911d_ev_fmt = {
.type = V4L2_EVENT_SOURCE_CHANGE,
.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
};

if (lt7911d_get_detected_timings(sd, &timings)) {enable_stream(sd, false);v4l2_dbg(1, debug, sd, "%s: No signal\n", __func__);
} else {if (!v4l2_match_dv_timings(&lt7911d->timings, &timings, 0, false)) {enable_stream(sd, false);/* automatically set timing rather than set by user */lt7911d_s_dv_timings(sd, &timings);v4l2_print_dv_timings(sd->name,"Format_change: New format: ",&timings, false);}
}if (sd->devnode)v4l2_subdev_notify_event(sd, &lt7911d_ev_fmt);

}

static int lt7911d_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
{
struct lt7911d_state *lt7911d = to_state(sd);

schedule_delayed_work(&lt7911d->delayed_work_res_change, HZ / 20);
*handled = true;return 0;

}

static irqreturn_t lt7911d_res_change_irq_handler(int irq, void *dev_id)
{
struct lt7911d_state *lt7911d = dev_id;
bool handled;

lt7911d_isr(&lt7911d->sd, 0, &handled);return handled ? IRQ_HANDLED : IRQ_NONE;

}

static irqreturn_t plugin_detect_irq_handler(int irq, void *dev_id)
{
struct lt7911d_state *lt7911d = dev_id;

/* control hpd output level after 25ms */
schedule_delayed_work(&lt7911d->delayed_work_enable_hotplug,HZ / 40);return IRQ_HANDLED;

}

static void lt7911d_irq_poll_timer(struct timer_list *t)
{
struct lt7911d_state *lt7911d = from_timer(lt7911d, t, timer);

schedule_work(&lt7911d->work_i2c_poll);
mod_timer(&lt7911d->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));

}

static void lt7911d_work_i2c_poll(struct work_struct *work)
{
struct lt7911d_state *lt7911d = container_of(work,
struct lt7911d_state, work_i2c_poll);
struct v4l2_subdev *sd = &lt7911d->sd;

lt7911d_format_change(sd);

}

static int lt7911d_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
struct v4l2_event_subscription *sub)
{
switch (sub->type) {
case V4L2_EVENT_SOURCE_CHANGE:
return v4l2_src_change_event_subdev_subscribe(sd, fh, sub);
case V4L2_EVENT_CTRL:
return v4l2_ctrl_subdev_subscribe_event(sd, fh, sub);
default:
return -EINVAL;
}
}

static int lt7911d_g_input_status(struct v4l2_subdev *sd, u32 *status)
{
*status = 0;
*status |= no_signal(sd) ? V4L2_IN_ST_NO_SIGNAL : 0;

v4l2_dbg(1, debug, sd, "%s: status = 0x%x\n", __func__, *status);return 0;

}

static int lt7911d_s_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct lt7911d_state *lt7911d = to_state(sd);

if (!timings)return -EINVAL;if (debug)v4l2_print_dv_timings(sd->name, "s_dv_timings: ",timings, false);if (v4l2_match_dv_timings(&lt7911d->timings, timings, 0, false)) {v4l2_dbg(1, debug, sd, "%s: no change\n", __func__);return 0;
}if (!v4l2_valid_dv_timings(timings,&lt7911d_timings_cap, NULL, NULL)) {v4l2_dbg(1, debug, sd, "%s: timings out of range\n", __func__);return -ERANGE;
}lt7911d->timings = *timings;enable_stream(sd, false);return 0;

}

static int lt7911d_g_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct lt7911d_state *lt7911d = to_state(sd);

*timings = lt7911d->timings;return 0;

}

static int lt7911d_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,&lt7911d_timings_cap, NULL, NULL);

}

static int lt7911d_query_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings)
{
struct lt7911d_state *lt7911d = to_state(sd);

*timings = lt7911d->timings;
if (debug)v4l2_print_dv_timings(sd->name,"query_dv_timings: ", timings, false);if (!v4l2_valid_dv_timings(timings, &lt7911d_timings_cap, NULL,NULL)) {v4l2_dbg(1, debug, sd, "%s: timings out of range\n",__func__);return -ERANGE;
}return 0;

}

static int lt7911d_dv_timings_cap(struct v4l2_subdev *sd,
struct v4l2_dv_timings_cap *cap)
{
if (cap->pad != 0)
return -EINVAL;

*cap = lt7911d_timings_cap;return 0;

}

static int lt7911d_g_mbus_config(struct v4l2_subdev *sd,
unsigned int pad, struct v4l2_mbus_config *cfg)
{
struct lt7911d_state *lt7911d = to_state(sd);

cfg->type = V4L2_MBUS_CSI2_DPHY;
cfg->flags = V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK |V4L2_MBUS_CSI2_CHANNEL_0;switch (lt7911d->csi_lanes_in_use) {
case 1:cfg->flags |= V4L2_MBUS_CSI2_1_LANE;break;
case 2:cfg->flags |= V4L2_MBUS_CSI2_2_LANE;break;
case 3:cfg->flags |= V4L2_MBUS_CSI2_3_LANE;break;
case 4:cfg->flags |= V4L2_MBUS_CSI2_4_LANE;break;default:return -EINVAL;
}return 0;

}

static int lt7911d_s_stream(struct v4l2_subdev *sd, int enable)
{
enable_stream(sd, enable);

return 0;

}

static int lt7911d_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
switch (code->index) {
case 0:
code->code = MEDIA_BUS_FMT_UYVY8_2X8;
break;

default:return -EINVAL;
}return 0;

}

static int lt7911d_enum_frame_sizes(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
if (fse->index >= ARRAY_SIZE(supported_modes))
return -EINVAL;

if (fse->code != MEDIA_BUS_FMT_UYVY8_2X8)return -EINVAL;fse->min_width  = supported_modes[fse->index].width;
fse->max_width  = supported_modes[fse->index].width;
fse->max_height = supported_modes[fse->index].height;
fse->min_height = supported_modes[fse->index].height;return 0;

}

static int lt7911d_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct lt7911d_state *lt7911d = to_state(sd);

mutex_lock(&lt7911d->confctl_mutex);
format->format.code = lt7911d->mbus_fmt_code;
format->format.width = lt7911d->timings.bt.width;
format->format.height = lt7911d->timings.bt.height;
format->format.field =lt7911d->timings.bt.interlaced ?V4L2_FIELD_INTERLACED : V4L2_FIELD_NONE;
format->format.colorspace = V4L2_COLORSPACE_SRGB;
mutex_unlock(&lt7911d->confctl_mutex);v4l2_dbg(1, debug, sd, "%s: fmt code:%d, w:%d, h:%d, field code:%d\n",__func__, format->format.code, format->format.width,format->format.height, format->format.field);return 0;

}

static int lt7911d_enum_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_interval_enum *fie)
{
if (fie->index >= ARRAY_SIZE(supported_modes))
return -EINVAL;

if (fie->code != MEDIA_BUS_FMT_UYVY8_2X8)return -EINVAL;fie->width = supported_modes[fie->index].width;
fie->height = supported_modes[fie->index].height;
fie->interval = supported_modes[fie->index].max_fps;return 0;

}

static int lt7911d_get_reso_dist(const struct lt7911d_mode *mode,
struct v4l2_mbus_framefmt *framefmt)
{
return abs(mode->width - framefmt->width) +
abs(mode->height - framefmt->height);
}

static const struct lt7911d_mode *
lt7911d_find_best_fit(struct v4l2_subdev_format *fmt)
{
struct v4l2_mbus_framefmt *framefmt = &fmt->format;
int dist;
int cur_best_fit = 0;
int cur_best_fit_dist = -1;
unsigned int i;

for (i = 0; i < ARRAY_SIZE(supported_modes); i++) {dist = lt7911d_get_reso_dist(&supported_modes[i], framefmt);if (cur_best_fit_dist == -1 || dist < cur_best_fit_dist) {cur_best_fit_dist = dist;cur_best_fit = i;}
}return &supported_modes[cur_best_fit];

}

static int lt7911d_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct lt7911d_state *lt7911d = to_state(sd);
const struct lt7911d_mode *mode;

/* is overwritten by get_fmt */
u32 code = format->format.code;
int ret = lt7911d_get_fmt(sd, cfg, format);format->format.code = code;if (ret)return ret;switch (code) {
case MEDIA_BUS_FMT_UYVY8_2X8:break;default:return -EINVAL;
}if (format->which == V4L2_SUBDEV_FORMAT_TRY)return 0;lt7911d->mbus_fmt_code = format->format.code;
mode = lt7911d_find_best_fit(format);
lt7911d->cur_mode = mode;
enable_stream(sd, false);return 0;

}

static int lt7911d_g_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *fi)
{
struct lt7911d_state *lt7911d = to_state(sd);
const struct lt7911d_mode *mode = lt7911d->cur_mode;

mutex_lock(&lt7911d->confctl_mutex);
fi->interval = mode->max_fps;
mutex_unlock(&lt7911d->confctl_mutex);return 0;

}

static void lt7911d_get_module_inf(struct lt7911d_state *lt7911d,
struct rkmodule_inf *inf)
{
memset(inf, 0, sizeof(*inf));
strscpy(inf->base.sensor, LT7911D_NAME, sizeof(inf->base.sensor));
strscpy(inf->base.module, lt7911d->module_name, sizeof(inf->base.module));
strscpy(inf->base.lens, lt7911d->len_name, sizeof(inf->base.lens));
}

static long lt7911d_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
struct lt7911d_state *lt7911d = to_state(sd);
long ret = 0;

switch (cmd) {
case RKMODULE_GET_MODULE_INFO:lt7911d_get_module_inf(lt7911d, (struct rkmodule_inf *)arg);break;
case RKMODULE_GET_HDMI_MODE:*(int *)arg = RKMODULE_HDMIIN_MODE;break;
default:ret = -ENOIOCTLCMD;break;
}return ret;

}

#ifdef CONFIG_COMPAT
static long lt7911d_compat_ioctl32(struct v4l2_subdev *sd,
unsigned int cmd, unsigned long arg)
{
void __user *up = compat_ptr(arg);
struct rkmodule_inf *inf;
long ret;
int *seq;

switch (cmd) {
case RKMODULE_GET_MODULE_INFO:inf = kzalloc(sizeof(*inf), GFP_KERNEL);if (!inf) {ret = -ENOMEM;return ret;}ret = lt7911d_ioctl(sd, cmd, inf);if (!ret) {ret = copy_to_user(up, inf, sizeof(*inf));if (ret)ret = -EFAULT;}kfree(inf);break;
case RKMODULE_GET_HDMI_MODE:seq = kzalloc(sizeof(*seq), GFP_KERNEL);if (!seq) {ret = -ENOMEM;return ret;}ret = lt7911d_ioctl(sd, cmd, seq);if (!ret) {ret = copy_to_user(up, seq, sizeof(*seq));if (ret)ret = -EFAULT;}kfree(seq);break;
default:ret = -ENOIOCTLCMD;break;
}return ret;

}
#endif

static const struct v4l2_subdev_core_ops lt7911d_core_ops = {
.interrupt_service_routine = lt7911d_isr,
.subscribe_event = lt7911d_subscribe_event,
.unsubscribe_event = v4l2_event_subdev_unsubscribe,
.ioctl = lt7911d_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl32 = lt7911d_compat_ioctl32,
#endif
};

static const struct v4l2_subdev_video_ops lt7911d_video_ops = {
.g_input_status = lt7911d_g_input_status,
.s_dv_timings = lt7911d_s_dv_timings,
.g_dv_timings = lt7911d_g_dv_timings,
.query_dv_timings = lt7911d_query_dv_timings,
.s_stream = lt7911d_s_stream,
.g_frame_interval = lt7911d_g_frame_interval,
};

static const struct v4l2_subdev_pad_ops lt7911d_pad_ops = {
.enum_mbus_code = lt7911d_enum_mbus_code,
.enum_frame_size = lt7911d_enum_frame_sizes,
.enum_frame_interval = lt7911d_enum_frame_interval,
.set_fmt = lt7911d_set_fmt,
.get_fmt = lt7911d_get_fmt,
.enum_dv_timings = lt7911d_enum_dv_timings,
.dv_timings_cap = lt7911d_dv_timings_cap,
.get_mbus_config = lt7911d_g_mbus_config,
};

static const struct v4l2_subdev_ops lt7911d_ops = {
.core = &lt7911d_core_ops,
.video = &lt7911d_video_ops,
.pad = &lt7911d_pad_ops,
};

static const struct v4l2_ctrl_config lt7911d_ctrl_audio_sampling_rate = {
.id = RK_V4L2_CID_AUDIO_SAMPLING_RATE,
.name = “Audio sampling rate”,
.type = V4L2_CTRL_TYPE_INTEGER,
.min = 0,
.max = 768000,
.step = 1,
.def = 0,
.flags = V4L2_CTRL_FLAG_READ_ONLY,
};

static const struct v4l2_ctrl_config lt7911d_ctrl_audio_present = {
.id = RK_V4L2_CID_AUDIO_PRESENT,
.name = “Audio present”,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.min = 0,
.max = 1,
.step = 1,
.def = 0,
.flags = V4L2_CTRL_FLAG_READ_ONLY,
};

static void lt7911d_reset(struct lt7911d_state lt7911d)
{
gpiod_set_value(lt7911d->reset_gpio, 0);
usleep_range(2000, 2100);
gpiod_set_value(lt7911d->reset_gpio, 1);
usleep_range(1201000, 1211000);
gpiod_set_value(lt7911d->reset_gpio, 0);
usleep_range(3001000, 310*1000);
}

static int lt7911d_init_v4l2_ctrls(struct lt7911d_state *lt7911d)
{
struct v4l2_subdev *sd;
int ret;

sd = &lt7911d->sd;
ret = v4l2_ctrl_handler_init(&lt7911d->hdl, 5);
if (ret)return ret;lt7911d->link_freq = v4l2_ctrl_new_int_menu(&lt7911d->hdl, NULL,V4L2_CID_LINK_FREQ,ARRAY_SIZE(link_freq_menu_items) - 1, 0,link_freq_menu_items);
lt7911d->pixel_rate = v4l2_ctrl_new_std(&lt7911d->hdl, NULL,V4L2_CID_PIXEL_RATE,0, LT7911D_PIXEL_RATE, 1, LT7911D_PIXEL_RATE);lt7911d->detect_tx_5v_ctrl = v4l2_ctrl_new_std(&lt7911d->hdl,NULL, V4L2_CID_DV_RX_POWER_PRESENT,0, 1, 0, 0);lt7911d->audio_sampling_rate_ctrl =v4l2_ctrl_new_custom(&lt7911d->hdl,&lt7911d_ctrl_audio_sampling_rate, NULL);
lt7911d->audio_present_ctrl = v4l2_ctrl_new_custom(&lt7911d->hdl,&lt7911d_ctrl_audio_present, NULL);sd->ctrl_handler = &lt7911d->hdl;
if (lt7911d->hdl.error) {ret = lt7911d->hdl.error;v4l2_err(sd, "cfg v4l2 ctrls failed! ret:%d\n", ret);return ret;
}__v4l2_ctrl_s_ctrl(lt7911d->link_freq, link_freq_menu_items[0]);
__v4l2_ctrl_s_ctrl_int64(lt7911d->pixel_rate, LT7911D_PIXEL_RATE);if (lt7911d_update_controls(sd)) {ret = -ENODEV;v4l2_err(sd, "update v4l2 ctrls failed! ret:%d\n", ret);return ret;
}return 0;

}

#ifdef CONFIG_OF
static int lt7911d_probe_of(struct lt7911d_state *lt7911d)
{
struct device *dev = &lt7911d->i2c_client->dev;
struct device_node *node = dev->of_node;
struct v4l2_fwnode_endpoint endpoint = { .bus_type = 0 };
struct device_node *ep;
int ret;

ret = of_property_read_u32(node, RKMODULE_CAMERA_MODULE_INDEX,&lt7911d->module_index);
ret |= of_property_read_string(node, RKMODULE_CAMERA_MODULE_FACING,&lt7911d->module_facing);
ret |= of_property_read_string(node, RKMODULE_CAMERA_MODULE_NAME,&lt7911d->module_name);
ret |= of_property_read_string(node, RKMODULE_CAMERA_LENS_NAME,&lt7911d->len_name);
if (ret) {dev_err(dev, "could not get module information!\n");return -EINVAL;
}lt7911d->power_gpio = devm_gpiod_get_optional(dev, "power",GPIOD_OUT_LOW);
if (IS_ERR(lt7911d->power_gpio)) {dev_err(dev, "failed to get power gpio\n");ret = PTR_ERR(lt7911d->power_gpio);return ret;
}lt7911d->reset_gpio = devm_gpiod_get_optional(dev, "reset",GPIOD_OUT_HIGH);
if (IS_ERR(lt7911d->reset_gpio)) {dev_err(dev, "failed to get reset gpio\n");ret = PTR_ERR(lt7911d->reset_gpio);return ret;
}lt7911d->plugin_det_gpio = devm_gpiod_get_optional(dev, "plugin-det",GPIOD_IN);
if (IS_ERR(lt7911d->plugin_det_gpio)) {dev_err(dev, "failed to get plugin det gpio\n");ret = PTR_ERR(lt7911d->plugin_det_gpio);return ret;
}ep = of_graph_get_next_endpoint(dev->of_node, NULL);
if (!ep) {dev_err(dev, "missing endpoint node\n");return -EINVAL;
}ret = v4l2_fwnode_endpoint_alloc_parse(of_fwnode_handle(ep), &endpoint);
if (ret) {dev_err(dev, "failed to parse endpoint\n");goto put_node;
}if (endpoint.bus_type != V4L2_MBUS_CSI2_DPHY ||endpoint.bus.mipi_csi2.num_data_lanes == 0) {dev_err(dev, "missing CSI-2 properties in endpoint\n");ret = -EINVAL;goto free_endpoint;
}lt7911d->xvclk = devm_clk_get(dev, "xvclk");
if (IS_ERR(lt7911d->xvclk)) {dev_err(dev, "failed to get xvclk\n");ret = -EINVAL;goto free_endpoint;
}ret = clk_prepare_enable(lt7911d->xvclk);
if (ret) {dev_err(dev, "Failed! to enable xvclk\n");goto free_endpoint;
}lt7911d->csi_lanes_in_use = endpoint.bus.mipi_csi2.num_data_lanes;
lt7911d->bus = endpoint.bus.mipi_csi2;
lt7911d->enable_hdcp = false;gpiod_set_value(lt7911d->power_gpio, 1);
lt7911d_reset(lt7911d);ret = 0;

free_endpoint:
v4l2_fwnode_endpoint_free(&endpoint);
put_node:
of_node_put(ep);
return ret;
}
#else
static inline int lt7911d_probe_of(struct lt7911d_state *state)
{
return -ENODEV;
}
#endif
static int lt7911d_check_chip_id(struct lt7911d_state *lt7911d)
{
struct device *dev = &lt7911d->i2c_client->dev;
struct v4l2_subdev *sd = &lt7911d->sd;
u8 id_h, id_l;
u32 chipid;
int ret = 0;

lt7911d_i2c_enable(sd);
id_l  = i2c_rd8(sd, CHIPID_REGL);
id_h  = i2c_rd8(sd, CHIPID_REGH);
lt7911d_i2c_disable(sd);chipid = (id_h << 8) | id_l;
if (chipid != LT7911D_CHIPID) {dev_err(dev, "chipid err, read:%#x, expect:%#x\n",chipid, LT7911D_CHIPID);return -EINVAL;
}
dev_info(dev, "check chipid ok, id:%#x", chipid);return ret;

}

static int lt7911d_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct lt7911d_state *lt7911d;
struct v4l2_subdev *sd;
struct device *dev = &client->dev;
char facing[2];
int err;

dev_info(dev, "driver version: %02x.%02x.%02x",DRIVER_VERSION >> 16,(DRIVER_VERSION & 0xff00) >> 8,DRIVER_VERSION & 0x00ff);lt7911d = devm_kzalloc(dev, sizeof(struct lt7911d_state), GFP_KERNEL);
if (!lt7911d)return -ENOMEM;sd = &lt7911d->sd;
lt7911d->i2c_client = client;
lt7911d->cur_mode = &supported_modes[0];
lt7911d->mbus_fmt_code = MEDIA_BUS_FMT_UYVY8_2X8;err = lt7911d_probe_of(lt7911d);
if (err) {v4l2_err(sd, "lt7911d_parse_of failed! err:%d\n", err);return err;
}err = lt7911d_check_chip_id(lt7911d);
if (err < 0)return err;lt7911d_reset(lt7911d);mutex_init(&lt7911d->confctl_mutex);
err = lt7911d_init_v4l2_ctrls(lt7911d);
if (err)goto err_free_hdl;client->flags |= I2C_CLIENT_SCCB;

#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
v4l2_i2c_subdev_init(sd, client, &lt7911d_ops);
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
#endif

#if defined(CONFIG_MEDIA_CONTROLLER)
lt7911d->pad.flags = MEDIA_PAD_FL_SOURCE;
sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
err = media_entity_pads_init(&sd->entity, 1, &lt7911d->pad);
if (err < 0) {
v4l2_err(sd, “media entity init failed! err:%d\n”, err);
goto err_free_hdl;
}
#endif
memset(facing, 0, sizeof(facing));
if (strcmp(lt7911d->module_facing, “back”) == 0)
facing[0] = ‘b’;
else
facing[0] = ‘f’;

snprintf(sd->name, sizeof(sd->name), "m%02d_%s_%s %s",lt7911d->module_index, facing,LT7911D_NAME, dev_name(sd->dev));
err = v4l2_async_register_subdev_sensor_common(sd);
if (err < 0) {v4l2_err(sd, "v4l2 register subdev failed! err:%d\n", err);goto err_clean_entity;
}INIT_DELAYED_WORK(&lt7911d->delayed_work_enable_hotplug,lt7911d_delayed_work_enable_hotplug);
INIT_DELAYED_WORK(&lt7911d->delayed_work_res_change,lt7911d_delayed_work_res_change);if (lt7911d->i2c_client->irq) {v4l2_dbg(1, debug, sd, "cfg lt7911d irq!\n");err = devm_request_threaded_irq(dev,lt7911d->i2c_client->irq,NULL, lt7911d_res_change_irq_handler,IRQF_TRIGGER_RISING | IRQF_ONESHOT,"lt7911d", lt7911d);if (err) {v4l2_err(sd, "request irq failed! err:%d\n", err);goto err_work_queues;}
} else {v4l2_dbg(1, debug, sd, "no irq, cfg poll!\n");INIT_WORK(&lt7911d->work_i2c_poll, lt7911d_work_i2c_poll);timer_setup(&lt7911d->timer, lt7911d_irq_poll_timer, 0);lt7911d->timer.expires = jiffies +msecs_to_jiffies(POLL_INTERVAL_MS);add_timer(&lt7911d->timer);
}lt7911d->plugin_irq = gpiod_to_irq(lt7911d->plugin_det_gpio);
if (lt7911d->plugin_irq < 0)dev_err(dev, "failed to get plugin det irq, maybe no use\n");err = devm_request_threaded_irq(dev, lt7911d->plugin_irq, NULL,plugin_detect_irq_handler, IRQF_TRIGGER_FALLING |IRQF_TRIGGER_RISING | IRQF_ONESHOT, "lt7911d",lt7911d);
if (err)dev_err(dev, "failed to register plugin det irq (%d), maybe no use\n", err);err = v4l2_ctrl_handler_setup(sd->ctrl_handler);
if (err) {v4l2_err(sd, "v4l2 ctrl handler setup failed! err:%d\n", err);goto err_work_queues;
}v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,client->addr << 1, client->adapter->name);return 0;

err_work_queues:
if (!lt7911d->i2c_client->irq)
flush_work(&lt7911d->work_i2c_poll);
cancel_delayed_work(&lt7911d->delayed_work_enable_hotplug);
cancel_delayed_work(&lt7911d->delayed_work_res_change);
err_clean_entity:
#if defined(CONFIG_MEDIA_CONTROLLER)
media_entity_cleanup(&sd->entity);
#endif
err_free_hdl:
v4l2_ctrl_handler_free(&lt7911d->hdl);
mutex_destroy(&lt7911d->confctl_mutex);
return err;
}

static int lt7911d_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct lt7911d_state *lt7911d = to_state(sd);

if (!lt7911d->i2c_client->irq) {del_timer_sync(&lt7911d->timer);flush_work(&lt7911d->work_i2c_poll);
}
cancel_delayed_work_sync(&lt7911d->delayed_work_enable_hotplug);
cancel_delayed_work_sync(&lt7911d->delayed_work_res_change);
v4l2_async_unregister_subdev(sd);
v4l2_device_unregister_subdev(sd);

#if defined(CONFIG_MEDIA_CONTROLLER)
media_entity_cleanup(&sd->entity);
#endif
v4l2_ctrl_handler_free(&lt7911d->hdl);
mutex_destroy(&lt7911d->confctl_mutex);
clk_disable_unprepare(lt7911d->xvclk);

return 0;

}

#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id lt7911d_of_match[] = {
{ .compatible = “lontium,lt7911d” },
{},
};
MODULE_DEVICE_TABLE(of, lt7911d_of_match);
#endif

static struct i2c_driver lt7911d_driver = {
.driver = {
.name = LT7911D_NAME,
.of_match_table = of_match_ptr(lt7911d_of_match),
},
.probe = lt7911d_probe,
.remove = lt7911d_remove,
};

static int __init lt7911d_driver_init(void)
{
return i2c_add_driver(&lt7911d_driver);
}

static void __exit lt7911d_driver_exit(void)
{
i2c_del_driver(&lt7911d_driver);
}

device_initcall_sync(lt7911d_driver_init);
module_exit(lt7911d_driver_exit);

MODULE_DESCRIPTION(“Lontium lt7911d HDMI to CSI-2 bridge driver”);
MODULE_AUTHOR(“xxx”);
MODULE_LICENSE(“GPL v2”);