#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/driver.h>
#include <linux/i2c-atr.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/rational.h>
#include <linux/regmap.h>
#include <media/i2c/ds90ub9xx.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-subdev.h>
#include "ds90ub953.h"
#define UB953_PAD_SINK 0
#define UB953_PAD_SOURCE 1
#define UB953_NUM_GPIOS 4
#define UB953_DEFAULT_CLKOUT_RATE 25000000UL
enum ub953_mode {
UB953_MODE_SYNC,
UB953_MODE_NONSYNC_EXT,
UB953_MODE_NONSYNC_INT,
UB953_MODE_DVP,
};
struct ub953_hw_data {
const char *model;
bool is_ub971;
};
struct ub953_clkout_data {
u32 hs_div;
u32 m;
u32 n;
unsigned long rate;
};
struct ub953_data {
const struct ub953_hw_data *hw_data;
struct i2c_client *client;
struct regmap *regmap;
struct clk *clkin;
u32 num_data_lanes;
bool non_continous_clk;
struct gpio_chip gpio_chip;
struct v4l2_subdev sd;
struct media_pad pads[2];
struct v4l2_async_notifier notifier;
struct v4l2_subdev *source_sd;
u16 source_sd_pad;
u64 enabled_source_streams;
struct mutex reg_lock;
u8 current_indirect_target;
struct clk_hw clkout_clk_hw;
enum ub953_mode mode;
const struct ds90ub9xx_platform_data *plat_data;
};
static inline struct ub953_data *sd_to_ub953(struct v4l2_subdev *sd)
{
return container_of(sd, struct ub953_data, sd);
}
static int ub953_read(struct ub953_data *priv, u8 reg, u8 *val, int *err)
{
unsigned int v;
int ret;
if (err && *err)
return *err;
mutex_lock(&priv->reg_lock);
ret = regmap_read(priv->regmap, reg, &v);
if (ret) {
dev_err(&priv->client->dev, "Cannot read register 0x%02x: %d\n",
reg, ret);
goto out_unlock;
}
*val = v;
out_unlock:
mutex_unlock(&priv->reg_lock);
if (ret && err)
*err = ret;
return ret;
}
static int ub953_write(struct ub953_data *priv, u8 reg, u8 val, int *err)
{
int ret;
if (err && *err)
return *err;
mutex_lock(&priv->reg_lock);
ret = regmap_write(priv->regmap, reg, val);
if (ret)
dev_err(&priv->client->dev,
"Cannot write register 0x%02x: %d\n", reg, ret);
mutex_unlock(&priv->reg_lock);
if (ret && err)
*err = ret;
return ret;
}
static int ub953_select_ind_reg_block(struct ub953_data *priv, u8 block)
{
struct device *dev = &priv->client->dev;
int ret;
if (priv->current_indirect_target == block)
return 0;
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_CTL, block << 2);
if (ret) {
dev_err(dev, "%s: cannot select indirect target %u (%d)\n",
__func__, block, ret);
return ret;
}
priv->current_indirect_target = block;
return 0;
}
__maybe_unused
static int ub953_read_ind(struct ub953_data *priv, u8 block, u8 reg, u8 *val,
int *err)
{
unsigned int v;
int ret;
if (err && *err)
return *err;
mutex_lock(&priv->reg_lock);
ret = ub953_select_ind_reg_block(priv, block);
if (ret)
goto out_unlock;
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_ADDR, reg);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_ADDR failed when reading %u:0x%02x: %d\n",
block, reg, ret);
goto out_unlock;
}
ret = regmap_read(priv->regmap, UB953_REG_IND_ACC_DATA, &v);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_DATA failed when reading %u:0x%02x: %d\n",
block, reg, ret);
goto out_unlock;
}
*val = v;
out_unlock:
mutex_unlock(&priv->reg_lock);
if (ret && err)
*err = ret;
return ret;
}
__maybe_unused
static int ub953_write_ind(struct ub953_data *priv, u8 block, u8 reg, u8 val,
int *err)
{
int ret;
if (err && *err)
return *err;
mutex_lock(&priv->reg_lock);
ret = ub953_select_ind_reg_block(priv, block);
if (ret)
goto out_unlock;
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_ADDR, reg);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_ADDR failed when writing %u:0x%02x: %d\n",
block, reg, ret);
goto out_unlock;
}
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_DATA, val);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_DATA failed when writing %u:0x%02x: %d\n",
block, reg, ret);
}
out_unlock:
mutex_unlock(&priv->reg_lock);
if (ret && err)
*err = ret;
return ret;
}
static int ub953_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct ub953_data *priv = gpiochip_get_data(gc);
int ret;
u8 v;
ret = ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, &v, NULL);
if (ret)
return ret;
if (v & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset))
return GPIO_LINE_DIRECTION_IN;
else
return GPIO_LINE_DIRECTION_OUT;
}
static int ub953_gpio_direction_in(struct gpio_chip *gc, unsigned int offset)
{
struct ub953_data *priv = gpiochip_get_data(gc);
return regmap_update_bits(priv->regmap, UB953_REG_GPIO_INPUT_CTRL,
UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) |
UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset),
UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset));
}
static int ub953_gpio_direction_out(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct ub953_data *priv = gpiochip_get_data(gc);
int ret;
ret = regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA,
UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),
value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) :
0);
if (ret)
return ret;
return regmap_update_bits(priv->regmap, UB953_REG_GPIO_INPUT_CTRL,
UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) |
UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset),
UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset));
}
static int ub953_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct ub953_data *priv = gpiochip_get_data(gc);
int ret;
u8 v;
ret = ub953_read(priv, UB953_REG_GPIO_PIN_STS, &v, NULL);
if (ret)
return ret;
return !!(v & UB953_REG_GPIO_PIN_STS_GPIO_STS(offset));
}
static int ub953_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
{
struct ub953_data *priv = gpiochip_get_data(gc);
return regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA,
UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),
value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) : 0);
}
static int ub953_gpio_of_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec,
u32 *flags)
{
if (flags)
*flags = gpiospec->args[1];
return gpiospec->args[0];
}
static int ub953_gpiochip_probe(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct gpio_chip *gc = &priv->gpio_chip;
int ret;
ret = ub953_write(priv, UB953_REG_LOCAL_GPIO_DATA, 0, NULL);
if (ret)
return ret;
ret = ub953_write(priv, UB953_REG_GPIO_INPUT_CTRL, 0xf, NULL);
if (ret)
return ret;
gc->label = dev_name(dev);
gc->parent = dev;
gc->owner = THIS_MODULE;
gc->base = -1;
gc->can_sleep = true;
gc->ngpio = UB953_NUM_GPIOS;
gc->get_direction = ub953_gpio_get_direction;
gc->direction_input = ub953_gpio_direction_in;
gc->direction_output = ub953_gpio_direction_out;
gc->get = ub953_gpio_get;
gc->set = ub953_gpio_set;
gc->of_xlate = ub953_gpio_of_xlate;
gc->of_gpio_n_cells = 2;
ret = gpiochip_add_data(gc, priv);
if (ret) {
dev_err(dev, "Failed to add GPIOs: %d\n", ret);
return ret;
}
return 0;
}
static void ub953_gpiochip_remove(struct ub953_data *priv)
{
gpiochip_remove(&priv->gpio_chip);
}
static int _ub953_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_krouting *routing)
{
static const struct v4l2_mbus_framefmt format = {
.width = 640,
.height = 480,
.code = MEDIA_BUS_FMT_UYVY8_1X16,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_SRGB,
.ycbcr_enc = V4L2_YCBCR_ENC_601,
.quantization = V4L2_QUANTIZATION_LIM_RANGE,
.xfer_func = V4L2_XFER_FUNC_SRGB,
};
int ret;
ret = v4l2_subdev_routing_validate(sd, routing,
V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
if (ret)
return ret;
ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, &format);
if (ret)
return ret;
return 0;
}
static int ub953_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
enum v4l2_subdev_format_whence which,
struct v4l2_subdev_krouting *routing)
{
struct ub953_data *priv = sd_to_ub953(sd);
if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams)
return -EBUSY;
return _ub953_set_routing(sd, state, routing);
}
static int ub953_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd)
{
struct ub953_data *priv = sd_to_ub953(sd);
struct v4l2_mbus_frame_desc source_fd;
struct v4l2_subdev_route *route;
struct v4l2_subdev_state *state;
int ret;
if (pad != UB953_PAD_SOURCE)
return -EINVAL;
ret = v4l2_subdev_call(priv->source_sd, pad, get_frame_desc,
priv->source_sd_pad, &source_fd);
if (ret)
return ret;
fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
state = v4l2_subdev_lock_and_get_active_state(sd);
for_each_active_route(&state->routing, route) {
struct v4l2_mbus_frame_desc_entry *source_entry = NULL;
unsigned int i;
if (route->source_pad != pad)
continue;
for (i = 0; i < source_fd.num_entries; i++) {
if (source_fd.entry[i].stream == route->sink_stream) {
source_entry = &source_fd.entry[i];
break;
}
}
if (!source_entry) {
dev_err(&priv->client->dev,
"Failed to find stream from source frame desc\n");
ret = -EPIPE;
goto out_unlock;
}
fd->entry[fd->num_entries].stream = route->source_stream;
fd->entry[fd->num_entries].flags = source_entry->flags;
fd->entry[fd->num_entries].length = source_entry->length;
fd->entry[fd->num_entries].pixelcode = source_entry->pixelcode;
fd->entry[fd->num_entries].bus.csi2.vc =
source_entry->bus.csi2.vc;
fd->entry[fd->num_entries].bus.csi2.dt =
source_entry->bus.csi2.dt;
fd->num_entries++;
}
out_unlock:
v4l2_subdev_unlock_state(state);
return ret;
}
static int ub953_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct ub953_data *priv = sd_to_ub953(sd);
struct v4l2_mbus_framefmt *fmt;
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
priv->enabled_source_streams)
return -EBUSY;
if (format->pad == UB953_PAD_SOURCE)
return v4l2_subdev_get_fmt(sd, state, format);
fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
if (!fmt)
return -EINVAL;
*fmt = format->format;
fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
format->stream);
if (!fmt)
return -EINVAL;
*fmt = format->format;
return 0;
}
static int ub953_init_state(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
struct v4l2_subdev_route routes[] = {
{
.sink_pad = UB953_PAD_SINK,
.sink_stream = 0,
.source_pad = UB953_PAD_SOURCE,
.source_stream = 0,
.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
},
};
struct v4l2_subdev_krouting routing = {
.num_routes = ARRAY_SIZE(routes),
.routes = routes,
};
return _ub953_set_routing(sd, state, &routing);
}
static int ub953_log_status(struct v4l2_subdev *sd)
{
struct ub953_data *priv = sd_to_ub953(sd);
struct device *dev = &priv->client->dev;
char id[UB953_REG_FPD3_RX_ID_LEN];
u8 gpio_local_data;
u8 gpio_input_ctrl;
u8 gpio_pin_sts;
unsigned int i;
u8 v, v1, v2;
int ret;
for (i = 0; i < sizeof(id); i++) {
ret = ub953_read(priv, UB953_REG_FPD3_RX_ID(i), &id[i], NULL);
if (ret)
return ret;
}
dev_info(dev, "ID '%.*s'\n", (int)sizeof(id), id);
ret = ub953_read(priv, UB953_REG_GENERAL_STATUS, &v, NULL);
if (ret)
return ret;
dev_info(dev, "GENERAL_STATUS %#02x\n", v);
ub953_read(priv, UB953_REG_CRC_ERR_CNT1, &v1, &ret);
ub953_read(priv, UB953_REG_CRC_ERR_CNT2, &v2, &ret);
if (ret)
return ret;
dev_info(dev, "CRC error count %u\n", v1 | (v2 << 8));
if (v1 || v2)
regmap_update_bits(priv->regmap, UB953_REG_BC_CTRL,
UB953_REG_BC_CTRL_CRC_ERR_CLR,
UB953_REG_BC_CTRL_CRC_ERR_CLR);
ret = ub953_read(priv, UB953_REG_CSI_ERR_CNT, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI error count %u\n", v);
ret = ub953_read(priv, UB953_REG_CSI_ERR_STATUS, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI_ERR_STATUS %#02x\n", v);
ret = ub953_read(priv, UB953_REG_CSI_ERR_DLANE01, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI_ERR_DLANE01 %#02x\n", v);
ret = ub953_read(priv, UB953_REG_CSI_ERR_DLANE23, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI_ERR_DLANE23 %#02x\n", v);
ret = ub953_read(priv, UB953_REG_CSI_ERR_CLK_LANE, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI_ERR_CLK_LANE %#02x\n", v);
ret = ub953_read(priv, UB953_REG_CSI_PKT_HDR_VC_ID, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI packet header VC %u ID %u\n", v >> 6, v & 0x3f);
ub953_read(priv, UB953_REG_PKT_HDR_WC_LSB, &v1, &ret);
ub953_read(priv, UB953_REG_PKT_HDR_WC_MSB, &v2, &ret);
if (ret)
return ret;
dev_info(dev, "CSI packet header WC %u\n", (v2 << 8) | v1);
ret = ub953_read(priv, UB953_REG_CSI_ECC, &v, NULL);
if (ret)
return ret;
dev_info(dev, "CSI ECC %#02x\n", v);
ub953_read(priv, UB953_REG_LOCAL_GPIO_DATA, &gpio_local_data, &ret);
ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, &gpio_input_ctrl, &ret);
ub953_read(priv, UB953_REG_GPIO_PIN_STS, &gpio_pin_sts, &ret);
if (ret)
return ret;
for (i = 0; i < UB953_NUM_GPIOS; i++) {
dev_info(dev,
"GPIO%u: remote: %u is_input: %u is_output: %u val: %u sts: %u\n",
i,
!!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(i)),
!!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(i)),
!!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_OUT_EN(i)),
!!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(i)),
!!(gpio_pin_sts & UB953_REG_GPIO_PIN_STS_GPIO_STS(i)));
}
return 0;
}
static int ub953_enable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state, u32 pad,
u64 streams_mask)
{
struct ub953_data *priv = sd_to_ub953(sd);
u64 sink_streams;
int ret;
sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE,
UB953_PAD_SINK,
&streams_mask);
ret = v4l2_subdev_enable_streams(priv->source_sd, priv->source_sd_pad,
sink_streams);
if (ret)
return ret;
priv->enabled_source_streams |= streams_mask;
return 0;
}
static int ub953_disable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state, u32 pad,
u64 streams_mask)
{
struct ub953_data *priv = sd_to_ub953(sd);
u64 sink_streams;
int ret;
sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE,
UB953_PAD_SINK,
&streams_mask);
ret = v4l2_subdev_disable_streams(priv->source_sd, priv->source_sd_pad,
sink_streams);
if (ret)
return ret;
priv->enabled_source_streams &= ~streams_mask;
return 0;
}
static const struct v4l2_subdev_pad_ops ub953_pad_ops = {
.enable_streams = ub953_enable_streams,
.disable_streams = ub953_disable_streams,
.set_routing = ub953_set_routing,
.get_frame_desc = ub953_get_frame_desc,
.get_fmt = v4l2_subdev_get_fmt,
.set_fmt = ub953_set_fmt,
};
static const struct v4l2_subdev_core_ops ub953_subdev_core_ops = {
.log_status = ub953_log_status,
};
static const struct v4l2_subdev_ops ub953_subdev_ops = {
.core = &ub953_subdev_core_ops,
.pad = &ub953_pad_ops,
};
static const struct v4l2_subdev_internal_ops ub953_internal_ops = {
.init_state = ub953_init_state,
};
static const struct media_entity_operations ub953_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static int ub953_notify_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *source_subdev,
struct v4l2_async_connection *asd)
{
struct ub953_data *priv = sd_to_ub953(notifier->sd);
struct device *dev = &priv->client->dev;
int ret;
ret = media_entity_get_fwnode_pad(&source_subdev->entity,
source_subdev->fwnode,
MEDIA_PAD_FL_SOURCE);
if (ret < 0) {
dev_err(dev, "Failed to find pad for %s\n",
source_subdev->name);
return ret;
}
priv->source_sd = source_subdev;
priv->source_sd_pad = ret;
ret = media_create_pad_link(&source_subdev->entity, priv->source_sd_pad,
&priv->sd.entity, 0,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret) {
dev_err(dev, "Unable to link %s:%u -> %s:0\n",
source_subdev->name, priv->source_sd_pad,
priv->sd.name);
return ret;
}
return 0;
}
static const struct v4l2_async_notifier_operations ub953_notify_ops = {
.bound = ub953_notify_bound,
};
static int ub953_v4l2_notifier_register(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct v4l2_async_connection *asd;
struct fwnode_handle *ep_fwnode;
int ret;
ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
UB953_PAD_SINK, 0, 0);
if (!ep_fwnode) {
dev_err(dev, "No graph endpoint\n");
return -ENODEV;
}
v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd);
asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode,
struct v4l2_async_connection);
fwnode_handle_put(ep_fwnode);
if (IS_ERR(asd)) {
dev_err(dev, "Failed to add subdev: %pe", asd);
v4l2_async_nf_cleanup(&priv->notifier);
return PTR_ERR(asd);
}
priv->notifier.ops = &ub953_notify_ops;
ret = v4l2_async_nf_register(&priv->notifier);
if (ret) {
dev_err(dev, "Failed to register subdev_notifier");
v4l2_async_nf_cleanup(&priv->notifier);
return ret;
}
return 0;
}
static void ub953_v4l2_notifier_unregister(struct ub953_data *priv)
{
v4l2_async_nf_unregister(&priv->notifier);
v4l2_async_nf_cleanup(&priv->notifier);
}
static int ub953_i2c_master_init(struct ub953_data *priv)
{
u32 ref = 26250000;
u32 scl_high = 915;
u32 scl_low = 1641;
int ret;
scl_high = div64_u64((u64)scl_high * ref, 1000000000) - 5;
scl_low = div64_u64((u64)scl_low * ref, 1000000000) - 5;
ret = ub953_write(priv, UB953_REG_SCL_HIGH_TIME, scl_high, NULL);
if (ret)
return ret;
ret = ub953_write(priv, UB953_REG_SCL_LOW_TIME, scl_low, NULL);
if (ret)
return ret;
return 0;
}
static u64 ub953_get_fc_rate(struct ub953_data *priv)
{
switch (priv->mode) {
case UB953_MODE_SYNC:
if (priv->hw_data->is_ub971)
return priv->plat_data->bc_rate * 160ull;
else
return priv->plat_data->bc_rate / 2 * 160ull;
case UB953_MODE_NONSYNC_EXT:
return clk_get_rate(priv->clkin) * 80ull;
default:
return 0;
}
}
static unsigned long ub953_calc_clkout_ub953(struct ub953_data *priv,
unsigned long target, u64 fc,
u8 *hs_div, u8 *m, u8 *n)
{
static const unsigned long hs_clk_div = 4;
u64 fc_divided;
unsigned long mul, div;
unsigned long res;
fc_divided = div_u64(fc, hs_clk_div);
rational_best_approximation(target, fc_divided, (1 << 5) - 1,
(1 << 8) - 1, &mul, &div);
res = div_u64(fc_divided * mul, div);
*hs_div = hs_clk_div;
*m = mul;
*n = div;
return res;
}
static unsigned long ub953_calc_clkout_ub971(struct ub953_data *priv,
unsigned long target, u64 fc,
u8 *m, u8 *n)
{
u64 fc_divided;
unsigned long mul, div;
unsigned long res;
fc_divided = div_u64(fc, 8);
rational_best_approximation(target, fc_divided, (1 << 5) - 1,
(1 << 8) - 1, &mul, &div);
res = div_u64(fc_divided * mul, div);
*m = mul;
*n = div;
return res;
}
static void ub953_calc_clkout_params(struct ub953_data *priv,
unsigned long target_rate,
struct ub953_clkout_data *clkout_data)
{
struct device *dev = &priv->client->dev;
unsigned long clkout_rate;
u64 fc_rate;
fc_rate = ub953_get_fc_rate(priv);
if (priv->hw_data->is_ub971) {
u8 m, n;
clkout_rate = ub953_calc_clkout_ub971(priv, target_rate,
fc_rate, &m, &n);
clkout_data->m = m;
clkout_data->n = n;
dev_dbg(dev, "%s %llu * %u / (8 * %u) = %lu (requested %lu)",
__func__, fc_rate, m, n, clkout_rate, target_rate);
} else {
u8 hs_div, m, n;
clkout_rate = ub953_calc_clkout_ub953(priv, target_rate,
fc_rate, &hs_div, &m, &n);
clkout_data->hs_div = hs_div;
clkout_data->m = m;
clkout_data->n = n;
dev_dbg(dev, "%s %llu / %u * %u / %u = %lu (requested %lu)",
__func__, fc_rate, hs_div, m, n, clkout_rate,
target_rate);
}
clkout_data->rate = clkout_rate;
}
static int ub953_write_clkout_regs(struct ub953_data *priv,
const struct ub953_clkout_data *clkout_data)
{
u8 clkout_ctrl0, clkout_ctrl1;
int ret;
if (priv->hw_data->is_ub971)
clkout_ctrl0 = clkout_data->m;
else
clkout_ctrl0 = (__ffs(clkout_data->hs_div) << 5) |
clkout_data->m;
clkout_ctrl1 = clkout_data->n;
ret = ub953_write(priv, UB953_REG_CLKOUT_CTRL0, clkout_ctrl0, NULL);
if (ret)
return ret;
ret = ub953_write(priv, UB953_REG_CLKOUT_CTRL1, clkout_ctrl1, NULL);
if (ret)
return ret;
return 0;
}
static unsigned long ub953_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
struct device *dev = &priv->client->dev;
u8 ctrl0, ctrl1;
u32 mul, div;
u64 fc_rate;
u32 hs_clk_div;
u64 rate;
int ret;
ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL0, &ctrl0, NULL);
if (ret) {
dev_err(dev, "Failed to read CLKOUT_CTRL0: %d\n", ret);
return 0;
}
ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL1, &ctrl1, NULL);
if (ret) {
dev_err(dev, "Failed to read CLKOUT_CTRL1: %d\n", ret);
return 0;
}
fc_rate = ub953_get_fc_rate(priv);
if (priv->hw_data->is_ub971) {
mul = ctrl0 & 0x1f;
div = ctrl1;
if (div == 0)
return 0;
rate = div_u64(fc_rate * mul, 8 * div);
dev_dbg(dev, "clkout: fc rate %llu, mul %u, div %u = %llu\n",
fc_rate, mul, div, rate);
} else {
mul = ctrl0 & 0x1f;
hs_clk_div = 1 << (ctrl0 >> 5);
div = ctrl1;
if (div == 0)
return 0;
rate = div_u64(div_u64(fc_rate, hs_clk_div) * mul, div);
dev_dbg(dev,
"clkout: fc rate %llu, hs_clk_div %u, mul %u, div %u = %llu\n",
fc_rate, hs_clk_div, mul, div, rate);
}
return rate;
}
static int ub953_clkout_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
struct ub953_clkout_data clkout_data;
ub953_calc_clkout_params(priv, req->rate, &clkout_data);
req->rate = clkout_data.rate;
return 0;
}
static int ub953_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
struct ub953_clkout_data clkout_data;
ub953_calc_clkout_params(priv, rate, &clkout_data);
dev_dbg(&priv->client->dev, "%s %lu (requested %lu)\n", __func__,
clkout_data.rate, rate);
return ub953_write_clkout_regs(priv, &clkout_data);
}
static const struct clk_ops ub953_clkout_ops = {
.recalc_rate = ub953_clkout_recalc_rate,
.determine_rate = ub953_clkout_determine_rate,
.set_rate = ub953_clkout_set_rate,
};
static int ub953_register_clkout(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
const struct clk_init_data init = {
.name = kasprintf(GFP_KERNEL, "ds90%s.%s.clk_out",
priv->hw_data->model, dev_name(dev)),
.ops = &ub953_clkout_ops,
};
struct ub953_clkout_data clkout_data;
int ret;
if (!init.name)
return -ENOMEM;
ub953_calc_clkout_params(priv, UB953_DEFAULT_CLKOUT_RATE, &clkout_data);
ret = ub953_write_clkout_regs(priv, &clkout_data);
if (ret)
return ret;
priv->clkout_clk_hw.init = &init;
ret = devm_clk_hw_register(dev, &priv->clkout_clk_hw);
kfree(init.name);
if (ret)
return dev_err_probe(dev, ret, "Cannot register clock HW\n");
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
&priv->clkout_clk_hw);
if (ret)
return dev_err_probe(dev, ret,
"Cannot add OF clock provider\n");
return 0;
}
static int ub953_add_i2c_adapter(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct i2c_atr_adap_desc desc = { };
struct fwnode_handle *i2c_handle;
int ret;
i2c_handle = device_get_named_child_node(dev, "i2c");
if (!i2c_handle)
return 0;
desc.chan_id = priv->plat_data->port;
desc.parent = dev;
desc.bus_handle = i2c_handle;
desc.num_aliases = 0;
ret = i2c_atr_add_adapter(priv->plat_data->atr, &desc);
fwnode_handle_put(i2c_handle);
if (ret)
return ret;
return 0;
}
static const struct regmap_config ub953_regmap_config = {
.name = "ds90ub953",
.reg_bits = 8,
.val_bits = 8,
.reg_format_endian = REGMAP_ENDIAN_DEFAULT,
.val_format_endian = REGMAP_ENDIAN_DEFAULT,
};
static int ub953_parse_dt(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct v4l2_fwnode_endpoint vep = {
.bus_type = V4L2_MBUS_CSI2_DPHY,
};
struct fwnode_handle *ep_fwnode;
unsigned char nlanes;
int ret;
ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
UB953_PAD_SINK, 0, 0);
if (!ep_fwnode)
return dev_err_probe(dev, -ENOENT, "no endpoint found\n");
ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep);
fwnode_handle_put(ep_fwnode);
if (ret)
return dev_err_probe(dev, ret,
"failed to parse sink endpoint data\n");
nlanes = vep.bus.mipi_csi2.num_data_lanes;
if (nlanes != 1 && nlanes != 2 && nlanes != 4)
return dev_err_probe(dev, -EINVAL,
"bad number of data-lanes: %u\n", nlanes);
priv->num_data_lanes = nlanes;
priv->non_continous_clk = vep.bus.mipi_csi2.flags &
V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
return 0;
}
static int ub953_hw_init(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
bool mode_override;
int ret;
u8 v;
ret = ub953_read(priv, UB953_REG_MODE_SEL, &v, NULL);
if (ret)
return ret;
if (!(v & UB953_REG_MODE_SEL_MODE_DONE))
return dev_err_probe(dev, -EIO, "Mode value not stabilized\n");
mode_override = v & UB953_REG_MODE_SEL_MODE_OVERRIDE;
switch (v & UB953_REG_MODE_SEL_MODE_MASK) {
case 0:
priv->mode = UB953_MODE_SYNC;
break;
case 2:
priv->mode = UB953_MODE_NONSYNC_EXT;
break;
case 3:
priv->mode = UB953_MODE_NONSYNC_INT;
break;
case 5:
priv->mode = UB953_MODE_DVP;
break;
default:
return dev_err_probe(dev, -EIO,
"Invalid mode in mode register\n");
}
dev_dbg(dev, "mode from %s: %#x\n", mode_override ? "reg" : "strap",
priv->mode);
if (priv->mode != UB953_MODE_SYNC &&
priv->mode != UB953_MODE_NONSYNC_EXT)
return dev_err_probe(dev, -ENODEV,
"Unsupported mode selected: %u\n",
priv->mode);
if (priv->mode == UB953_MODE_NONSYNC_EXT && !priv->clkin)
return dev_err_probe(dev, -EINVAL,
"clkin required for non-sync ext mode\n");
ret = ub953_read(priv, UB953_REG_REV_MASK_ID, &v, NULL);
if (ret)
return dev_err_probe(dev, ret, "Failed to read revision");
dev_info(dev, "Found %s rev/mask %#04x\n", priv->hw_data->model, v);
ret = ub953_read(priv, UB953_REG_GENERAL_CFG, &v, NULL);
if (ret)
return ret;
dev_dbg(dev, "i2c strap setting %s V\n",
(v & UB953_REG_GENERAL_CFG_I2C_STRAP_MODE) ? "1.8" : "3.3");
ret = ub953_i2c_master_init(priv);
if (ret)
return dev_err_probe(dev, ret, "i2c init failed\n");
v = 0;
v |= priv->non_continous_clk ? 0 : UB953_REG_GENERAL_CFG_CONT_CLK;
v |= (priv->num_data_lanes - 1) <<
UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT;
v |= UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE;
ret = ub953_write(priv, UB953_REG_GENERAL_CFG, v, NULL);
if (ret)
return ret;
v = 1U << UB953_REG_I2C_CONTROL2_SDA_OUTPUT_SETUP_SHIFT;
v |= UB953_REG_I2C_CONTROL2_BUS_SPEEDUP;
ret = ub953_write(priv, UB953_REG_I2C_CONTROL2, v, NULL);
return ret;
}
static int ub953_subdev_init(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
int ret;
v4l2_i2c_subdev_init(&priv->sd, priv->client, &ub953_subdev_ops);
priv->sd.internal_ops = &ub953_internal_ops;
priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
V4L2_SUBDEV_FL_STREAMS;
priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
priv->sd.entity.ops = &ub953_entity_ops;
priv->pads[0].flags = MEDIA_PAD_FL_SINK;
priv->pads[1].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&priv->sd.entity, 2, priv->pads);
if (ret)
return dev_err_probe(dev, ret, "Failed to init pads\n");
ret = v4l2_subdev_init_finalize(&priv->sd);
if (ret)
goto err_entity_cleanup;
ret = ub953_v4l2_notifier_register(priv);
if (ret) {
dev_err_probe(dev, ret,
"v4l2 subdev notifier register failed\n");
goto err_free_state;
}
ret = v4l2_async_register_subdev(&priv->sd);
if (ret) {
dev_err_probe(dev, ret, "v4l2_async_register_subdev error\n");
goto err_unreg_notif;
}
return 0;
err_unreg_notif:
ub953_v4l2_notifier_unregister(priv);
err_free_state:
v4l2_subdev_cleanup(&priv->sd);
err_entity_cleanup:
media_entity_cleanup(&priv->sd.entity);
return ret;
}
static void ub953_subdev_uninit(struct ub953_data *priv)
{
v4l2_async_unregister_subdev(&priv->sd);
ub953_v4l2_notifier_unregister(priv);
v4l2_subdev_cleanup(&priv->sd);
media_entity_cleanup(&priv->sd.entity);
}
static int ub953_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct ub953_data *priv;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client = client;
priv->hw_data = device_get_match_data(dev);
priv->plat_data = dev_get_platdata(&client->dev);
if (!priv->plat_data)
return dev_err_probe(dev, -ENODEV, "Platform data missing\n");
mutex_init(&priv->reg_lock);
priv->current_indirect_target = 0xff;
priv->regmap = devm_regmap_init_i2c(client, &ub953_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err_probe(dev, ret, "Failed to init regmap\n");
goto err_mutex_destroy;
}
priv->clkin = devm_clk_get_optional(dev, "clkin");
if (IS_ERR(priv->clkin)) {
ret = PTR_ERR(priv->clkin);
dev_err_probe(dev, ret, "failed to parse 'clkin'\n");
goto err_mutex_destroy;
}
ret = ub953_parse_dt(priv);
if (ret)
goto err_mutex_destroy;
ret = ub953_hw_init(priv);
if (ret)
goto err_mutex_destroy;
ret = ub953_gpiochip_probe(priv);
if (ret) {
dev_err_probe(dev, ret, "Failed to init gpiochip\n");
goto err_mutex_destroy;
}
ret = ub953_register_clkout(priv);
if (ret) {
dev_err_probe(dev, ret, "Failed to register clkout\n");
goto err_gpiochip_remove;
}
ret = ub953_subdev_init(priv);
if (ret)
goto err_gpiochip_remove;
ret = ub953_add_i2c_adapter(priv);
if (ret) {
dev_err_probe(dev, ret, "failed to add remote i2c adapter\n");
goto err_subdev_uninit;
}
return 0;
err_subdev_uninit:
ub953_subdev_uninit(priv);
err_gpiochip_remove:
ub953_gpiochip_remove(priv);
err_mutex_destroy:
mutex_destroy(&priv->reg_lock);
return ret;
}
static void ub953_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ub953_data *priv = sd_to_ub953(sd);
i2c_atr_del_adapter(priv->plat_data->atr, priv->plat_data->port);
ub953_subdev_uninit(priv);
ub953_gpiochip_remove(priv);
mutex_destroy(&priv->reg_lock);
}
static const struct ub953_hw_data ds90ub953_hw = {
.model = "ub953",
};
static const struct ub953_hw_data ds90ub971_hw = {
.model = "ub971",
.is_ub971 = true,
};
static const struct i2c_device_id ub953_id[] = {
{ "ds90ub953-q1", (kernel_ulong_t)&ds90ub953_hw },
{ "ds90ub971-q1", (kernel_ulong_t)&ds90ub971_hw },
{}
};
MODULE_DEVICE_TABLE(i2c, ub953_id);
static const struct of_device_id ub953_dt_ids[] = {
{ .compatible = "ti,ds90ub953-q1", .data = &ds90ub953_hw },
{ .compatible = "ti,ds90ub971-q1", .data = &ds90ub971_hw },
{}
};
MODULE_DEVICE_TABLE(of, ub953_dt_ids);
static struct i2c_driver ds90ub953_driver = {
.probe = ub953_probe,
.remove = ub953_remove,
.id_table = ub953_id,
.driver = {
.name = "ds90ub953",
.of_match_table = ub953_dt_ids,
},
};
module_i2c_driver(ds90ub953_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Texas Instruments FPD-Link III/IV CSI-2 Serializers Driver");
MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>");
MODULE_IMPORT_NS("I2C_ATR");
