// SPDX-License-Identifier: MIT
/*
* Copyright 2020 Noralf Trønnes
*/
#include <linux/backlight.h>
#include <linux/workqueue.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
#include <drm/drm_file.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/gud.h>
#include "gud_internal.h"
struct gud_connector {
struct drm_connector connector;
struct drm_encoder encoder;
struct backlight_device *backlight;
struct work_struct backlight_work;
/* Supported properties */
u16 *properties;
unsigned int num_properties;
/* Initial gadget tv state if applicable, applied on state reset */
struct drm_tv_connector_state initial_tv_state;
/*
* Initial gadget backlight brightness if applicable, applied on state reset.
* The value -ENODEV is used to signal no backlight.
*/
int initial_brightness;
};
static inline struct gud_connector *to_gud_connector(struct drm_connector *connector)
{
return container_of(connector, struct gud_connector, connector);
}
static void gud_conn_err(struct drm_connector *connector, const char *msg, int ret)
{
dev_err(connector->dev->dev, "%s: %s (ret=%d)\n", connector->name, msg, ret);
}
/*
* Use a worker to avoid taking kms locks inside the backlight lock.
* Other display drivers use backlight within their kms locks.
* This avoids inconsistent locking rules, which would upset lockdep.
*/
static void gud_connector_backlight_update_status_work(struct work_struct *work)
{
struct gud_connector *gconn = container_of(work, struct gud_connector, backlight_work);
struct drm_connector *connector = &gconn->connector;
struct drm_connector_state *connector_state;
struct drm_device *drm = connector->dev;
struct drm_modeset_acquire_ctx ctx;
struct drm_atomic_state *state;
int idx, ret;
if (!drm_dev_enter(drm, &idx))
return;
state = drm_atomic_state_alloc(drm);
if (!state) {
ret = -ENOMEM;
goto exit;
}
drm_modeset_acquire_init(&ctx, 0);
state->acquire_ctx = &ctx;
retry:
connector_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(connector_state)) {
ret = PTR_ERR(connector_state);
goto out;
}
/* Reuse tv.brightness to avoid having to subclass */
connector_state->tv.brightness = gconn->backlight->props.brightness;
ret = drm_atomic_commit(state);
out:
if (ret == -EDEADLK) {
drm_atomic_state_clear(state);
drm_modeset_backoff(&ctx);
goto retry;
}
drm_atomic_state_put(state);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
exit:
drm_dev_exit(idx);
if (ret)
dev_err(drm->dev, "Failed to update backlight, err=%d\n", ret);
}
static int gud_connector_backlight_update_status(struct backlight_device *bd)
{
struct drm_connector *connector = bl_get_data(bd);
struct gud_connector *gconn = to_gud_connector(connector);
/* The USB timeout is 5 seconds so use system_long_wq for worst case scenario */
queue_work(system_long_wq, &gconn->backlight_work);
return 0;
}
static const struct backlight_ops gud_connector_backlight_ops = {
.update_status = gud_connector_backlight_update_status,
};
static int gud_connector_backlight_register(struct gud_connector *gconn)
{
struct drm_connector *connector = &gconn->connector;
struct backlight_device *bd;
const char *name;
const struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.scale = BACKLIGHT_SCALE_NON_LINEAR,
.max_brightness = 100,
.brightness = gconn->initial_brightness,
};
name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
connector->dev->primary->index, connector->name);
if (!name)
return -ENOMEM;
bd = backlight_device_register(name, connector->kdev, connector,
&gud_connector_backlight_ops, &props);
kfree(name);
if (IS_ERR(bd))
return PTR_ERR(bd);
gconn->backlight = bd;
return 0;
}
static int gud_connector_detect(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx, bool force)
{
struct gud_device *gdrm = to_gud_device(connector->dev);
int idx, ret;
u8 status;
if (!drm_dev_enter(connector->dev, &idx))
return connector_status_disconnected;
if (force) {
ret = gud_usb_set(gdrm, GUD_REQ_SET_CONNECTOR_FORCE_DETECT,
connector->index, NULL, 0);
if (ret) {
ret = connector_status_unknown;
goto exit;
}
}
ret = gud_usb_get_u8(gdrm, GUD_REQ_GET_CONNECTOR_STATUS, connector->index, &status);
if (ret) {
ret = connector_status_unknown;
goto exit;
}
switch (status & GUD_CONNECTOR_STATUS_CONNECTED_MASK) {
case GUD_CONNECTOR_STATUS_DISCONNECTED:
ret = connector_status_disconnected;
break;
case GUD_CONNECTOR_STATUS_CONNECTED:
ret = connector_status_connected;
break;
default:
ret = connector_status_unknown;
break;
}
if (status & GUD_CONNECTOR_STATUS_CHANGED)
connector->epoch_counter += 1;
exit:
drm_dev_exit(idx);
return ret;
}
struct gud_connector_get_edid_ctx {
void *buf;
size_t len;
bool edid_override;
};
static int gud_connector_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
{
struct gud_connector_get_edid_ctx *ctx = data;
size_t start = block * EDID_LENGTH;
ctx->edid_override = false;
if (start + len > ctx->len)
return -1;
memcpy(buf, ctx->buf + start, len);
return 0;
}
static int gud_connector_get_modes(struct drm_connector *connector)
{
struct gud_device *gdrm = to_gud_device(connector->dev);
struct gud_display_mode_req *reqmodes = NULL;
struct gud_connector_get_edid_ctx edid_ctx;
unsigned int i, num_modes = 0;
const struct drm_edid *drm_edid = NULL;
int idx, ret;
if (!drm_dev_enter(connector->dev, &idx))
return 0;
edid_ctx.edid_override = true;
edid_ctx.buf = kmalloc(GUD_CONNECTOR_MAX_EDID_LEN, GFP_KERNEL);
if (!edid_ctx.buf)
goto out;
ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_EDID, connector->index,
edid_ctx.buf, GUD_CONNECTOR_MAX_EDID_LEN);
if (ret > 0 && ret % EDID_LENGTH) {
gud_conn_err(connector, "Invalid EDID size", ret);
} else if (ret > 0) {
edid_ctx.len = ret;
drm_edid = drm_edid_read_custom(connector, gud_connector_get_edid_block, &edid_ctx);
}
kfree(edid_ctx.buf);
drm_edid_connector_update(connector, drm_edid);
if (drm_edid && edid_ctx.edid_override)
goto out;
reqmodes = kmalloc_array(GUD_CONNECTOR_MAX_NUM_MODES, sizeof(*reqmodes), GFP_KERNEL);
if (!reqmodes)
goto out;
ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_MODES, connector->index,
reqmodes, GUD_CONNECTOR_MAX_NUM_MODES * sizeof(*reqmodes));
if (ret <= 0)
goto out;
if (ret % sizeof(*reqmodes)) {
gud_conn_err(connector, "Invalid display mode array size", ret);
goto out;
}
num_modes = ret / sizeof(*reqmodes);
for (i = 0; i < num_modes; i++) {
struct drm_display_mode *mode;
mode = drm_mode_create(connector->dev);
if (!mode) {
num_modes = i;
goto out;
}
gud_to_display_mode(mode, &reqmodes[i]);
drm_mode_probed_add(connector, mode);
}
out:
if (!num_modes)
num_modes = drm_edid_connector_add_modes(connector);
kfree(reqmodes);
drm_edid_free(drm_edid);
drm_dev_exit(idx);
return num_modes;
}
static int gud_connector_atomic_check(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct drm_connector_state *new_state;
struct drm_crtc_state *new_crtc_state;
struct drm_connector_state *old_state;
new_state = drm_atomic_get_new_connector_state(state, connector);
if (!new_state->crtc)
return 0;
old_state = drm_atomic_get_old_connector_state(state, connector);
new_crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
if (old_state->tv.margins.left != new_state->tv.margins.left ||
old_state->tv.margins.right != new_state->tv.margins.right ||
old_state->tv.margins.top != new_state->tv.margins.top ||
old_state->tv.margins.bottom != new_state->tv.margins.bottom ||
old_state->tv.legacy_mode != new_state->tv.legacy_mode ||
old_state->tv.brightness != new_state->tv.brightness ||
old_state->tv.contrast != new_state->tv.contrast ||
old_state->tv.flicker_reduction != new_state->tv.flicker_reduction ||
old_state->tv.overscan != new_state->tv.overscan ||
old_state->tv.saturation != new_state->tv.saturation ||
old_state->tv.hue != new_state->tv.hue)
new_crtc_state->connectors_changed = true;
return 0;
}
static const struct drm_connector_helper_funcs gud_connector_helper_funcs = {
.detect_ctx = gud_connector_detect,
.get_modes = gud_connector_get_modes,
.atomic_check = gud_connector_atomic_check,
};
static int gud_connector_late_register(struct drm_connector *connector)
{
struct gud_connector *gconn = to_gud_connector(connector);
if (gconn->initial_brightness < 0)
return 0;
return gud_connector_backlight_register(gconn);
}
static void gud_connector_early_unregister(struct drm_connector *connector)
{
struct gud_connector *gconn = to_gud_connector(connector);
backlight_device_unregister(gconn->backlight);
cancel_work_sync(&gconn->backlight_work);
}
static void gud_connector_destroy(struct drm_connector *connector)
{
struct gud_connector *gconn = to_gud_connector(connector);
drm_connector_cleanup(connector);
kfree(gconn->properties);
kfree(gconn);
}
static void gud_connector_reset(struct drm_connector *connector)
{
struct gud_connector *gconn = to_gud_connector(connector);
drm_atomic_helper_connector_reset(connector);
connector->state->tv = gconn->initial_tv_state;
/* Set margins from command line */
drm_atomic_helper_connector_tv_margins_reset(connector);
if (gconn->initial_brightness >= 0)
connector->state->tv.brightness = gconn->initial_brightness;
}
static const struct drm_connector_funcs gud_connector_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.late_register = gud_connector_late_register,
.early_unregister = gud_connector_early_unregister,
.destroy = gud_connector_destroy,
.reset = gud_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
/*
* The tv.mode property is shared among the connectors and its enum names are
* driver specific. This means that if more than one connector uses tv.mode,
* the enum names has to be the same.
*/
static int gud_connector_add_tv_mode(struct gud_device *gdrm, struct drm_connector *connector)
{
size_t buf_len = GUD_CONNECTOR_TV_MODE_MAX_NUM * GUD_CONNECTOR_TV_MODE_NAME_LEN;
const char *modes[GUD_CONNECTOR_TV_MODE_MAX_NUM];
unsigned int i, num_modes;
char *buf;
int ret;
buf = kmalloc(buf_len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_TV_MODE_VALUES,
connector->index, buf, buf_len);
if (ret < 0)
goto free;
if (!ret || ret % GUD_CONNECTOR_TV_MODE_NAME_LEN) {
ret = -EIO;
goto free;
}
num_modes = ret / GUD_CONNECTOR_TV_MODE_NAME_LEN;
for (i = 0; i < num_modes; i++)
modes[i] = &buf[i * GUD_CONNECTOR_TV_MODE_NAME_LEN];
ret = drm_mode_create_tv_properties_legacy(connector->dev, num_modes, modes);
free:
kfree(buf);
if (ret < 0)
gud_conn_err(connector, "Failed to add TV modes", ret);
return ret;
}
static struct drm_property *
gud_connector_property_lookup(struct drm_connector *connector, u16 prop)
{
struct drm_mode_config *config = &connector->dev->mode_config;
switch (prop) {
case GUD_PROPERTY_TV_LEFT_MARGIN:
return config->tv_left_margin_property;
case GUD_PROPERTY_TV_RIGHT_MARGIN:
return config->tv_right_margin_property;
case GUD_PROPERTY_TV_TOP_MARGIN:
return config->tv_top_margin_property;
case GUD_PROPERTY_TV_BOTTOM_MARGIN:
return config->tv_bottom_margin_property;
case GUD_PROPERTY_TV_MODE:
return config->legacy_tv_mode_property;
case GUD_PROPERTY_TV_BRIGHTNESS:
return config->tv_brightness_property;
case GUD_PROPERTY_TV_CONTRAST:
return config->tv_contrast_property;
case GUD_PROPERTY_TV_FLICKER_REDUCTION:
return config->tv_flicker_reduction_property;
case GUD_PROPERTY_TV_OVERSCAN:
return config->tv_overscan_property;
case GUD_PROPERTY_TV_SATURATION:
return config->tv_saturation_property;
case GUD_PROPERTY_TV_HUE:
return config->tv_hue_property;
default:
return ERR_PTR(-EINVAL);
}
}
static unsigned int *gud_connector_tv_state_val(u16 prop, struct drm_tv_connector_state *state)
{
switch (prop) {
case GUD_PROPERTY_TV_LEFT_MARGIN:
return &state->margins.left;
case GUD_PROPERTY_TV_RIGHT_MARGIN:
return &state->margins.right;
case GUD_PROPERTY_TV_TOP_MARGIN:
return &state->margins.top;
case GUD_PROPERTY_TV_BOTTOM_MARGIN:
return &state->margins.bottom;
case GUD_PROPERTY_TV_MODE:
return &state->legacy_mode;
case GUD_PROPERTY_TV_BRIGHTNESS:
return &state->brightness;
case GUD_PROPERTY_TV_CONTRAST:
return &state->contrast;
case GUD_PROPERTY_TV_FLICKER_REDUCTION:
return &state->flicker_reduction;
case GUD_PROPERTY_TV_OVERSCAN:
return &state->overscan;
case GUD_PROPERTY_TV_SATURATION:
return &state->saturation;
case GUD_PROPERTY_TV_HUE:
return &state->hue;
default:
return ERR_PTR(-EINVAL);
}
}
static int gud_connector_add_properties(struct gud_device *gdrm, struct gud_connector *gconn)
{
struct drm_connector *connector = &gconn->connector;
struct drm_device *drm = &gdrm->drm;
struct gud_property_req *properties;
unsigned int i, num_properties;
int ret;
properties = kcalloc(GUD_CONNECTOR_PROPERTIES_MAX_NUM, sizeof(*properties), GFP_KERNEL);
if (!properties)
return -ENOMEM;
ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_PROPERTIES, connector->index,
properties, GUD_CONNECTOR_PROPERTIES_MAX_NUM * sizeof(*properties));
if (ret <= 0)
goto out;
if (ret % sizeof(*properties)) {
ret = -EIO;
goto out;
}
num_properties = ret / sizeof(*properties);
ret = 0;
gconn->properties = kcalloc(num_properties, sizeof(*gconn->properties), GFP_KERNEL);
if (!gconn->properties) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < num_properties; i++) {
u16 prop = le16_to_cpu(properties[i].prop);
u64 val = le64_to_cpu(properties[i].val);
struct drm_property *property;
unsigned int *state_val;
drm_dbg(drm, "property: %u = %llu(0x%llx)\n", prop, val, val);
switch (prop) {
case GUD_PROPERTY_TV_LEFT_MARGIN:
fallthrough;
case GUD_PROPERTY_TV_RIGHT_MARGIN:
fallthrough;
case GUD_PROPERTY_TV_TOP_MARGIN:
fallthrough;
case GUD_PROPERTY_TV_BOTTOM_MARGIN:
ret = drm_mode_create_tv_margin_properties(drm);
if (ret)
goto out;
break;
case GUD_PROPERTY_TV_MODE:
ret = gud_connector_add_tv_mode(gdrm, connector);
if (ret)
goto out;
break;
case GUD_PROPERTY_TV_BRIGHTNESS:
fallthrough;
case GUD_PROPERTY_TV_CONTRAST:
fallthrough;
case GUD_PROPERTY_TV_FLICKER_REDUCTION:
fallthrough;
case GUD_PROPERTY_TV_OVERSCAN:
fallthrough;
case GUD_PROPERTY_TV_SATURATION:
fallthrough;
case GUD_PROPERTY_TV_HUE:
/* This is a no-op if already added. */
ret = drm_mode_create_tv_properties_legacy(drm, 0, NULL);
if (ret)
goto out;
break;
case GUD_PROPERTY_BACKLIGHT_BRIGHTNESS:
if (val > 100) {
ret = -EINVAL;
goto out;
}
gconn->initial_brightness = val;
break;
default:
/* New ones might show up in future devices, skip those we don't know. */
drm_dbg(drm, "Ignoring unknown property: %u\n", prop);
continue;
}
gconn->properties[gconn->num_properties++] = prop;
if (prop == GUD_PROPERTY_BACKLIGHT_BRIGHTNESS)
continue; /* not a DRM property */
property = gud_connector_property_lookup(connector, prop);
if (WARN_ON(IS_ERR(property)))
continue;
state_val = gud_connector_tv_state_val(prop, &gconn->initial_tv_state);
if (WARN_ON(IS_ERR(state_val)))
continue;
*state_val = val;
drm_object_attach_property(&connector->base, property, 0);
}
out:
kfree(properties);
return ret;
}
int gud_connector_fill_properties(struct drm_connector_state *connector_state,
struct gud_property_req *properties)
{
struct gud_connector *gconn = to_gud_connector(connector_state->connector);
unsigned int i;
for (i = 0; i < gconn->num_properties; i++) {
u16 prop = gconn->properties[i];
u64 val;
if (prop == GUD_PROPERTY_BACKLIGHT_BRIGHTNESS) {
val = connector_state->tv.brightness;
} else {
unsigned int *state_val;
state_val = gud_connector_tv_state_val(prop, &connector_state->tv);
if (WARN_ON_ONCE(IS_ERR(state_val)))
return PTR_ERR(state_val);
val = *state_val;
}
properties[i].prop = cpu_to_le16(prop);
properties[i].val = cpu_to_le64(val);
}
return gconn->num_properties;
}
static int gud_connector_create(struct gud_device *gdrm, unsigned int index,
struct gud_connector_descriptor_req *desc)
{
struct drm_device *drm = &gdrm->drm;
struct gud_connector *gconn;
struct drm_connector *connector;
struct drm_encoder *encoder;
int ret, connector_type;
u32 flags;
gconn = kzalloc(sizeof(*gconn), GFP_KERNEL);
if (!gconn)
return -ENOMEM;
INIT_WORK(&gconn->backlight_work, gud_connector_backlight_update_status_work);
gconn->initial_brightness = -ENODEV;
flags = le32_to_cpu(desc->flags);
connector = &gconn->connector;
drm_dbg(drm, "Connector: index=%u type=%u flags=0x%x\n", index, desc->connector_type, flags);
switch (desc->connector_type) {
case GUD_CONNECTOR_TYPE_PANEL:
connector_type = DRM_MODE_CONNECTOR_USB;
break;
case GUD_CONNECTOR_TYPE_VGA:
connector_type = DRM_MODE_CONNECTOR_VGA;
break;
case GUD_CONNECTOR_TYPE_DVI:
connector_type = DRM_MODE_CONNECTOR_DVID;
break;
case GUD_CONNECTOR_TYPE_COMPOSITE:
connector_type = DRM_MODE_CONNECTOR_Composite;
break;
case GUD_CONNECTOR_TYPE_SVIDEO:
connector_type = DRM_MODE_CONNECTOR_SVIDEO;
break;
case GUD_CONNECTOR_TYPE_COMPONENT:
connector_type = DRM_MODE_CONNECTOR_Component;
break;
case GUD_CONNECTOR_TYPE_DISPLAYPORT:
connector_type = DRM_MODE_CONNECTOR_DisplayPort;
break;
case GUD_CONNECTOR_TYPE_HDMI:
connector_type = DRM_MODE_CONNECTOR_HDMIA;
break;
default: /* future types */
connector_type = DRM_MODE_CONNECTOR_USB;
break;
}
drm_connector_helper_add(connector, &gud_connector_helper_funcs);
ret = drm_connector_init(drm, connector, &gud_connector_funcs, connector_type);
if (ret) {
kfree(connector);
return ret;
}
if (WARN_ON(connector->index != index))
return -EINVAL;
if (flags & GUD_CONNECTOR_FLAGS_POLL_STATUS)
connector->polled = (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT);
if (flags & GUD_CONNECTOR_FLAGS_INTERLACE)
connector->interlace_allowed = true;
if (flags & GUD_CONNECTOR_FLAGS_DOUBLESCAN)
connector->doublescan_allowed = true;
ret = gud_connector_add_properties(gdrm, gconn);
if (ret) {
gud_conn_err(connector, "Failed to add properties", ret);
return ret;
}
/* The first connector is attached to the existing simple pipe encoder */
if (!connector->index) {
encoder = &gdrm->pipe.encoder;
} else {
encoder = &gconn->encoder;
ret = drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE);
if (ret)
return ret;
encoder->possible_crtcs = 1;
}
return drm_connector_attach_encoder(connector, encoder);
}
int gud_get_connectors(struct gud_device *gdrm)
{
struct gud_connector_descriptor_req *descs;
unsigned int i, num_connectors;
int ret;
descs = kmalloc_array(GUD_CONNECTORS_MAX_NUM, sizeof(*descs), GFP_KERNEL);
if (!descs)
return -ENOMEM;
ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTORS, 0,
descs, GUD_CONNECTORS_MAX_NUM * sizeof(*descs));
if (ret < 0)
goto free;
if (!ret || ret % sizeof(*descs)) {
ret = -EIO;
goto free;
}
num_connectors = ret / sizeof(*descs);
for (i = 0; i < num_connectors; i++) {
ret = gud_connector_create(gdrm, i, &descs[i]);
if (ret)
goto free;
}
free:
kfree(descs);
return ret;
}
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