[PATCH v4] drm/bridge/sii8620: add remote control support
Mauro Carvalho Chehab
mchehab at s-opensource.com
Sun Aug 27 12:29:27 UTC 2017
Em Thu, 24 Aug 2017 10:58:07 +0200
Maciej Purski <m.purski at samsung.com> escreveu:
> 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 at samsung.com>
Acked-by: Mauro Carvalho Chehab <mchehab at s-opensource.com>
> ---
>
> Changes in v2:
> - use RC subsystem (including CEC keymap)
> - RC device initialized in attach drm_bridge callback and
> removed in detach callback. This is necessary, because RC_CORE,
> which is needed during rc_dev init, is loaded after sii8620.
> DRM bridge is binded later which solves the problem.
> - add RC_CORE dependency
>
> Changes in v3:
> - fix error handling in init_rcp and in attach callback
>
> Changes in v4:
> - usage of rc-core API compatible with upcoming changes
> - fix error handling in init_rcp
> - fix commit message
> ---
> drivers/gpu/drm/bridge/Kconfig | 2 +-
> drivers/gpu/drm/bridge/sil-sii8620.c | 96 ++++++++++++++++++++++++++++++++++--
> include/drm/bridge/mhl.h | 4 ++
> 3 files changed, 96 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index adf9ae0..6ef901c 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -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.
> diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
> index 2d51a22..ecb26c4 100644
> --- a/drivers/gpu/drm/bridge/sil-sii8620.c
> +++ b/drivers/gpu/drm/bridge/sil-sii8620.c
> @@ -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 @@ static bool sii8620_mode_fixup(struct drm_bridge *bridge,
> }
>
> 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;
> }
> diff --git a/include/drm/bridge/mhl.h b/include/drm/bridge/mhl.h
> index fbdfc8d..96a5e0f 100644
> --- a/include/drm/bridge/mhl.h
> +++ b/include/drm/bridge/mhl.h
> @@ -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
> */
Thanks,
Mauro
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