[PATCH] drm/bridge/sii8620: add remote control support
Sean Young
sean at mess.org
Sun Aug 6 10:01:06 UTC 2017
Hi Maciej,
On Thu, Aug 03, 2017 at 10:28:04AM +0200, Hans Verkuil wrote:
> Hi Maciej,
>
> Unfortunately I do not have the MHL spec, but I was wondering what the
> relationship between RCP and CEC is. CEC has remote control support as
> well, so is RCP that subset of the CEC specification or is it completely
> separate?
>
> I'm CC-ing Sean Young and the linux-media mailinglist as well since Sean
> maintains the rc subsystem. Which you probably should use, but I'm not the
> expert on that.
Yes, I agree. Using rc core the keymap can be changed from user space, and
is defined elsewhere.
In include/media/rc-map.h you'll have to define a new protocol (unless the
protocol is CEC).
In drivers/media/rc/keymaps/ a new keymap should be defined.
Use devm_rc_allocate_device(RC_DRIVER_SCANCODE) to create the device; then
you'll need to at least set these members:
input_phys = DRIVER_NAME "/input0";
input_id.bustype = BUS_HOST;
map_name = RC_MAP_RCP;
allowed_protocols = RC_BIT_RCP;
driver_name = DRIVER_NAME;
device_name = DEVICE_NAME;
Then register with devm_rc_register_device(), and report keys with
rc_keydown() and rc_keyup().
> On 08/03/17 09:44, Maciej Purski wrote:
> > 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>
> > ---
> > drivers/gpu/drm/bridge/sil-sii8620.c | 188 ++++++++++++++++++++++++++++++++++-
> > include/drm/bridge/mhl.h | 4 +
> > 2 files changed, 187 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
> > index 2d51a22..7e75f2f 100644
> > --- a/drivers/gpu/drm/bridge/sil-sii8620.c
> > +++ b/drivers/gpu/drm/bridge/sil-sii8620.c
> > @@ -19,6 +19,7 @@
> > #include <linux/delay.h>
> > #include <linux/gpio/consumer.h>
> > #include <linux/i2c.h>
> > +#include <linux/input.h>
> > #include <linux/interrupt.h>
> > #include <linux/irq.h>
> > #include <linux/kernel.h>
> > @@ -58,6 +59,7 @@ enum sii8620_mt_state {
> > struct sii8620 {
> > struct drm_bridge bridge;
> > struct device *dev;
> > + struct input_dev *rcp_input_dev;
> > struct clk *clk_xtal;
> > struct gpio_desc *gpio_reset;
> > struct gpio_desc *gpio_int;
> > @@ -106,6 +108,82 @@ struct sii8620_mt_msg {
> > sii8620_cb continuation;
> > };
> >
> > +static struct {
> > + u16 key;
> > + u16 extra_key;
> > + bool autorepeat;
Again let the input layer handle autorepeat, see REP_DELAY and REP_PERIOD.
> > +} rcp_keymap[] = {
> > + [0x00] = { KEY_SELECT },
> > + [0x01] = { KEY_UP, 0, true },
> > + [0x02] = { KEY_DOWN, 0, true },
> > + [0x03] = { KEY_LEFT, 0, true },
> > + [0x04] = { KEY_RIGHT, 0, true },
> > +
> > + [0x05] = { KEY_RIGHT, KEY_UP, true },
> > + [0x06] = { KEY_RIGHT, KEY_DOWN, true },
> > + [0x07] = { KEY_LEFT, KEY_UP, true },
> > + [0x08] = { KEY_LEFT, KEY_DOWN, true },
This should be replaced with KEY_RIGHT_UP, RC_RIGHT_DOWN, etc.
> > +
> > + [0x09] = { KEY_MENU },
> > + [0x0A] = { KEY_UNKNOWN },
> > + [0x0B] = { KEY_UNKNOWN },
> > + [0x0C] = { KEY_BOOKMARKS },
> > + [0x0D] = { KEY_EXIT },
> > +
> > + [0x20] = { KEY_NUMERIC_0 },
> > + [0x21] = { KEY_NUMERIC_1 },
> > + [0x22] = { KEY_NUMERIC_2 },
> > + [0x23] = { KEY_NUMERIC_3 },
> > + [0x24] = { KEY_NUMERIC_4 },
> > + [0x25] = { KEY_NUMERIC_5 },
> > + [0x26] = { KEY_NUMERIC_6 },
> > + [0x27] = { KEY_NUMERIC_7 },
> > + [0x28] = { KEY_NUMERIC_8 },
> > + [0x29] = { KEY_NUMERIC_9 },
> > +
> > + [0x2A] = { KEY_DOT },
> > + [0x2B] = { KEY_ENTER },
> > + [0x2C] = { KEY_CLEAR },
> > +
> > + [0x30] = { KEY_CHANNELUP, 0, true },
> > + [0x31] = { KEY_CHANNELDOWN, 0, true },
> > +
> > + [0x33] = { KEY_SOUND },
> > + [0x35] = { KEY_PROGRAM }, /* Show Information */
> > +
> > + [0x37] = { KEY_PAGEUP, 0, true },
> > + [0x38] = { KEY_PAGEDOWN, 0, true },
> > +
> > + [0x41] = { KEY_VOLUMEUP, 0, true },
> > + [0x42] = { KEY_VOLUMEDOWN, 0, true },
> > + [0x43] = { KEY_MUTE },
> > + [0x44] = { KEY_PLAY },
> > + [0x45] = { KEY_STOP },
> > + [0x46] = { KEY_PLAYPAUSE }, /* Pause */
> > + [0x47] = { KEY_RECORD },
> > + [0x48] = { KEY_REWIND, 0, true },
> > + [0x49] = { KEY_FASTFORWARD, 0, true },
> > + [0x4A] = { KEY_EJECTCD },
> > + [0x4B] = { KEY_NEXTSONG, 0, true }, /* Forward */
> > + [0x4C] = { KEY_PREVIOUSSONG, 0, true }, /* Backward */
> > +
> > + [0x60] = { KEY_PLAYPAUSE }, /* Play */
> > + [0x61] = { KEY_PLAYPAUSE }, /* Pause the Play */
> > + [0x62] = { KEY_RECORD },
> > + [0x63] = { KEY_PAUSE },
> > + [0x64] = { KEY_STOP },
> > + [0x65] = { KEY_MUTE },
> > + [0x66] = { KEY_MUTE }, /* Restore Mute */
> > +
> > + [0x71] = { KEY_F1 },
> > + [0x72] = { KEY_F2 },
> > + [0x73] = { KEY_F3 },
> > + [0x74] = { KEY_F4 },
> > + [0x75] = { KEY_F5 },
> > +
> > + [0x7E] = { KEY_VENDOR },
> > +};
> > +
> > static const u8 sii8620_i2c_page[] = {
> > 0x39, /* Main System */
> > 0x3d, /* TDM and HSIC */
> > @@ -431,6 +509,16 @@ 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 +1841,43 @@ static void sii8620_send_features(struct sii8620 *ctx)
> > sii8620_write_buf(ctx, REG_MDT_XMIT_WRITE_PORT, buf, ARRAY_SIZE(buf));
> > }
> >
> > +static void sii8620_rcp_report_key(struct sii8620 *ctx, u8 keycode, bool pressed)
> > +{
> > + input_report_key(ctx->rcp_input_dev,
> > + rcp_keymap[keycode].key, pressed);
> > +
> > + if (rcp_keymap[keycode].extra_key)
> > + input_report_key(ctx->rcp_input_dev,
> > + rcp_keymap[keycode].extra_key, pressed);
> > +}
> > +
> > +static bool sii8620_rcp_consume(struct sii8620 *ctx, u8 keycode)
> > +{
> > + bool pressed = !(keycode & MHL_RCP_KEY_RELEASED_MASK);
> > +
> > + if (!ctx->rcp_input_dev) {
> > + dev_dbg(ctx->dev, "RCP input device not initialized\n");
> > + return false;
> > + }
> > +
> > + keycode &= MHL_RCP_KEY_ID_MASK;
> > + if (keycode >= ARRAY_SIZE(rcp_keymap) || !rcp_keymap[keycode].key) {
> > + dev_dbg(ctx->dev, "Unsupported RCP key code: %d\n", keycode);
> > + return false;
> > + }
> > +
> > + if (rcp_keymap[keycode].autorepeat && pressed) {
> > + sii8620_rcp_report_key(ctx, keycode, true);
> > + sii8620_rcp_report_key(ctx, keycode, false);
> > + } else if (!rcp_keymap[keycode].autorepeat) {
> > + sii8620_rcp_report_key(ctx, keycode, pressed);
> > + }
> > +
> > + input_sync(ctx->rcp_input_dev);
> > +
> > + return true;
> > +}
> > +
> > static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
> > {
> > u8 ints[MHL_INT_SIZE];
> > @@ -1804,19 +1929,25 @@ 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]);
> > @@ -2102,6 +2233,51 @@ 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 input_dev *i_dev = input_allocate_device();
> > + int ret, i;
> > + u16 keycode;
> > +
> > + if (!i_dev) {
> > + dev_err(ctx->dev, "Failed to allocate RCP input device\n");
> > + ctx->error = -ENOMEM;
> > + }
> > +
> > + set_bit(EV_KEY, i_dev->evbit);
> > + i_dev->name = "MHL Remote Control";
> > + i_dev->keycode = rcp_keymap;
> > + i_dev->keycodesize = sizeof(u16);
> > + i_dev->keycodemax = ARRAY_SIZE(rcp_keymap);
> > +
> > + for (i = 0; i < ARRAY_SIZE(rcp_keymap); i++) {
> > + keycode = rcp_keymap[i].key;
> > + if (keycode)
> > + __set_bit(keycode, i_dev->keybit);
> > + }
> > +
> > + i_dev->id.bustype = BUS_VIRTUAL;
> > + ret = input_register_device(i_dev);
> > +
> > + if (ret) {
> > + dev_err(ctx->dev, "Failed to register rcp input device\n");
> > + input_free_device(i_dev);
> > + ctx->error = ret;
> > + }
> > +
> > + ctx->rcp_input_dev = i_dev;
> > +}
> > +
> > +static void sii8620_remove_rcp_input_dev(struct sii8620 *ctx)
> > +{
> > + if (!ctx->rcp_input_dev)
> > + return;
> > +
> > + input_unregister_device(ctx->rcp_input_dev);
> > + input_free_device(ctx->rcp_input_dev);
> > + ctx->rcp_input_dev = NULL;
> > +}
> > +
> > static inline struct sii8620 *bridge_to_sii8620(struct drm_bridge *bridge)
> > {
> > return container_of(bridge, struct sii8620, bridge);
> > @@ -2207,6 +2383,7 @@ static int sii8620_probe(struct i2c_client *client,
> > ctx->bridge.of_node = dev->of_node;
> > drm_bridge_add(&ctx->bridge);
> >
> > + sii8620_init_rcp_input_dev(ctx);
> > sii8620_cable_in(ctx);
> >
> > return 0;
> > @@ -2217,8 +2394,9 @@ 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);
> > + sii8620_remove_rcp_input_dev(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
> > */
> >
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