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drm/bridge/sii8620: add remote control support 

MHL specification defines Remote Control Protocol(RCP) to
send input events between MHL devices.
The driver now recognizes RCP messages and reacts to them
by reporting key events to input subsystem, allowing
a user to control a device using TV remote control.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
Acked-by: Sean Young <sean@mess.org>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1503565087-19730-1-git-send-email-m.purski@samsung.com
hifive-unleashed-5.1
Maciej Purski 2017-08-24 10:58:07 +02:00 committed by Andrzej Hajda
parent da184deeb8
commit e25f1f7c94
3 changed files with 96 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/bridge/Kconfig
View File

@ -71,7 +71,7 @@ config DRM_PARADE_PS8622
config DRM_SIL_SII8620
tristate "Silicon Image SII8620 HDMI/MHL bridge"
depends on OF
depends on OF && RC_CORE
select DRM_KMS_HELPER
help
Silicon Image SII8620 HDMI/MHL bridge chip driver.

96
drivers/gpu/drm/bridge/sil-sii8620.c
View File

@ -28,6 +28,8 @@
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <media/rc-core.h>
#include "sil-sii8620.h"
#define SII8620_BURST_BUF_LEN 288
@ -58,6 +60,7 @@ enum sii8620_mt_state {
struct sii8620 {
struct drm_bridge bridge;
struct device *dev;
struct rc_dev *rc_dev;
struct clk *clk_xtal;
struct gpio_desc *gpio_reset;
struct gpio_desc *gpio_int;
@ -431,6 +434,16 @@ static void sii8620_mt_rap(struct sii8620 *ctx, u8 code)
sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RAP, code);
}
static void sii8620_mt_rcpk(struct sii8620 *ctx, u8 code)
{
sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RCPK, code);
}
static void sii8620_mt_rcpe(struct sii8620 *ctx, u8 code)
{
sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RCPE, code);
}
static void sii8620_mt_read_devcap_send(struct sii8620 *ctx,
struct sii8620_mt_msg *msg)
{
@ -1753,6 +1766,25 @@ static void sii8620_send_features(struct sii8620 *ctx)
sii8620_write_buf(ctx, REG_MDT_XMIT_WRITE_PORT, buf, ARRAY_SIZE(buf));
}
static bool sii8620_rcp_consume(struct sii8620 *ctx, u8 scancode)
{
bool pressed = !(scancode & MHL_RCP_KEY_RELEASED_MASK);
scancode &= MHL_RCP_KEY_ID_MASK;
if (!ctx->rc_dev) {
dev_dbg(ctx->dev, "RCP input device not initialized\n");
return false;
}
if (pressed)
rc_keydown(ctx->rc_dev, RC_PROTO_CEC, scancode, 0);
else
rc_keyup(ctx->rc_dev);
return true;
}
static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
{
u8 ints[MHL_INT_SIZE];
@ -1804,19 +1836,25 @@ static void sii8620_msc_mt_done(struct sii8620 *ctx)
static void sii8620_msc_mr_msc_msg(struct sii8620 *ctx)
{
struct sii8620_mt_msg *msg = sii8620_msc_msg_first(ctx);
struct sii8620_mt_msg *msg;
u8 buf[2];
if (!msg)
return;
sii8620_read_buf(ctx, REG_MSC_MR_MSC_MSG_RCVD_1ST_DATA, buf, 2);
switch (buf[0]) {
case MHL_MSC_MSG_RAPK:
msg = sii8620_msc_msg_first(ctx);
if (!msg)
return;
msg->ret = buf[1];
ctx->mt_state = MT_STATE_DONE;
break;
case MHL_MSC_MSG_RCP:
if (!sii8620_rcp_consume(ctx, buf[1]))
sii8620_mt_rcpe(ctx,
MHL_RCPE_STATUS_INEFFECTIVE_KEY_CODE);
sii8620_mt_rcpk(ctx, buf[1]);
break;
default:
dev_err(ctx->dev, "%s message type %d,%d not supported",
__func__, buf[0], buf[1]);
@ -2102,11 +2140,57 @@ static void sii8620_cable_in(struct sii8620 *ctx)
enable_irq(to_i2c_client(ctx->dev)->irq);
}
static void sii8620_init_rcp_input_dev(struct sii8620 *ctx)
{
struct rc_dev *rc_dev;
int ret;
rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
if (!rc_dev) {
dev_err(ctx->dev, "Failed to allocate RC device\n");
ctx->error = -ENOMEM;
return;
}
rc_dev->input_phys = "sii8620/input0";
rc_dev->input_id.bustype = BUS_VIRTUAL;
rc_dev->map_name = RC_MAP_CEC;
rc_dev->allowed_protocols = RC_PROTO_BIT_CEC;
rc_dev->driver_name = "sii8620";
rc_dev->device_name = "sii8620";
ret = rc_register_device(rc_dev);
if (ret) {
dev_err(ctx->dev, "Failed to register RC device\n");
ctx->error = ret;
rc_free_device(ctx->rc_dev);
return;
}
ctx->rc_dev = rc_dev;
}
static inline struct sii8620 *bridge_to_sii8620(struct drm_bridge *bridge)
{
return container_of(bridge, struct sii8620, bridge);
}
static int sii8620_attach(struct drm_bridge *bridge)
{
struct sii8620 *ctx = bridge_to_sii8620(bridge);
sii8620_init_rcp_input_dev(ctx);
return sii8620_clear_error(ctx);
}
static void sii8620_detach(struct drm_bridge *bridge)
{
struct sii8620 *ctx = bridge_to_sii8620(bridge);
rc_unregister_device(ctx->rc_dev);
}
static bool sii8620_mode_fixup(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
@ -2151,6 +2235,8 @@ end:
}
static const struct drm_bridge_funcs sii8620_bridge_funcs = {
.attach = sii8620_attach,
.detach = sii8620_detach,
.mode_fixup = sii8620_mode_fixup,
};
@ -2217,8 +2303,8 @@ static int sii8620_remove(struct i2c_client *client)
struct sii8620 *ctx = i2c_get_clientdata(client);
disable_irq(to_i2c_client(ctx->dev)->irq);
drm_bridge_remove(&ctx->bridge);
sii8620_hw_off(ctx);
drm_bridge_remove(&ctx->bridge);
return 0;
}

4
include/drm/bridge/mhl.h
View File

@ -262,6 +262,10 @@ enum {
#define MHL_RAPK_UNSUPPORTED 0x02 /* Rcvd RAP action code not supported */
#define MHL_RAPK_BUSY 0x03 /* Responder too busy to respond */
/* Bit masks for RCP messages */
#define MHL_RCP_KEY_RELEASED_MASK 0x80
#define MHL_RCP_KEY_ID_MASK 0x7F
/*
* Error status codes for RCPE messages
*/