| Message ID | 1526912506-18406-4-git-send-email-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Neil, 2018-05-21 16:21 GMT+02:00 Neil Armstrong <narmstrong@baylibre.com>: > The EC can expose a CEC bus, this patch adds the CEC related definitions > needed by the cros-ec-cec driver. > Having a 16 byte mkbp event size makes it possible to send CEC > messages from the EC to the AP directly inside the mkbp event > instead of first doing a notification and then a read. > > Signed-off-by: Stefan Adolfsson <sadolfsson@chromium.org> > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > drivers/platform/chrome/cros_ec_proto.c | 40 ++++++++++--- > include/linux/mfd/cros_ec.h | 2 +- > include/linux/mfd/cros_ec_commands.h | 103 ++++++++++++++++++++++++++++++++ > 3 files changed, 135 insertions(+), 10 deletions(-) > > diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c > index e7bbdf9..c4f6c44 100644 > --- a/drivers/platform/chrome/cros_ec_proto.c > +++ b/drivers/platform/chrome/cros_ec_proto.c > @@ -504,10 +504,31 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, > } > EXPORT_SYMBOL(cros_ec_cmd_xfer_status); > > +static int get_next_event_xfer(struct cros_ec_device *ec_dev, > + struct cros_ec_command *msg, > + int version, uint32_t size) > +{ > + int ret; > + > + msg->version = version; > + msg->command = EC_CMD_GET_NEXT_EVENT; > + msg->insize = size; > + msg->outsize = 0; > + > + ret = cros_ec_cmd_xfer(ec_dev, msg); > + if (ret > 0) { > + ec_dev->event_size = ret - 1; > + memcpy(&ec_dev->event_data, msg->data, ec_dev->event_size); > + } > + > + return ret; > +} > + > static int get_next_event(struct cros_ec_device *ec_dev) > { > u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)]; > struct cros_ec_command *msg = (struct cros_ec_command *)&buffer; > + static int cmd_version = 1; > int ret; > > if (ec_dev->suspended) { > @@ -515,18 +536,19 @@ static int get_next_event(struct cros_ec_device *ec_dev) > return -EHOSTDOWN; > } > > - msg->version = 0; > - msg->command = EC_CMD_GET_NEXT_EVENT; > - msg->insize = sizeof(ec_dev->event_data); > - msg->outsize = 0; > + if (cmd_version == 1) { > + ret = get_next_event_xfer(ec_dev, msg, cmd_version, > + sizeof(struct ec_response_get_next_event_v1)); > + if (ret < 0 || msg->result != EC_RES_INVALID_VERSION) > + return ret; > Thinking a bit more, there is a command to ask supported command versions (EC_CMD_GET_CMD_VERSION). So, i theory you should be able to ask for the versions supported by the command, see for example what is done in [1], [2] and [3]. Anyway I am fine with this for now, and after do some test seems that nothing breaks, so Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Thanks, Enric [1] https://chromium.googlesource.com/chromiumos/platform/ec/+/master/util/misc_util.c#98 [2] https://chromium.googlesource.com/chromiumos/platform/ec/+/master/util/misc_util.c#131 [3] https://chromium.googlesource.com/chromiumos/platform/ec/+/master/util/ectool.c#786 > - ret = cros_ec_cmd_xfer(ec_dev, msg); > - if (ret > 0) { > - ec_dev->event_size = ret - 1; > - memcpy(&ec_dev->event_data, msg->data, > - sizeof(ec_dev->event_data)); > + /* Fallback to version 0 for future send attempts */ > + cmd_version = 0; > } > > + ret = get_next_event_xfer(ec_dev, msg, cmd_version, > + sizeof(struct ec_response_get_next_event)); > + > return ret; > } > > diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h > index f36125e..32caef3 100644 > --- a/include/linux/mfd/cros_ec.h > +++ b/include/linux/mfd/cros_ec.h > @@ -147,7 +147,7 @@ struct cros_ec_device { > bool mkbp_event_supported; > struct blocking_notifier_head event_notifier; > > - struct ec_response_get_next_event event_data; > + struct ec_response_get_next_event_v1 event_data; > int event_size; > u32 host_event_wake_mask; > }; > diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h > index f2edd99..9b8bc4a 100644 > --- a/include/linux/mfd/cros_ec_commands.h > +++ b/include/linux/mfd/cros_ec_commands.h > @@ -804,6 +804,8 @@ enum ec_feature_code { > EC_FEATURE_MOTION_SENSE_FIFO = 24, > /* EC has RTC feature that can be controlled by host commands */ > EC_FEATURE_RTC = 27, > + /* EC supports CEC commands */ > + EC_FEATURE_CEC = 35, > }; > > #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32)) > @@ -2078,6 +2080,12 @@ enum ec_mkbp_event { > /* EC sent a sysrq command */ > EC_MKBP_EVENT_SYSRQ = 6, > > + /* Notify the AP that something happened on CEC */ > + EC_MKBP_CEC_EVENT = 8, > + > + /* Send an incoming CEC message to the AP */ > + EC_MKBP_EVENT_CEC_MESSAGE = 9, > + > /* Number of MKBP events */ > EC_MKBP_EVENT_COUNT, > }; > @@ -2093,12 +2101,31 @@ union ec_response_get_next_data { > uint32_t sysrq; > } __packed; > > +union ec_response_get_next_data_v1 { > + uint8_t key_matrix[16]; > + > + /* Unaligned */ > + uint32_t host_event; > + > + uint32_t buttons; > + uint32_t switches; > + uint32_t sysrq; > + uint32_t cec_events; > + uint8_t cec_message[16]; > +} __packed; > + > struct ec_response_get_next_event { > uint8_t event_type; > /* Followed by event data if any */ > union ec_response_get_next_data data; > } __packed; > > +struct ec_response_get_next_event_v1 { > + uint8_t event_type; > + /* Followed by event data if any */ > + union ec_response_get_next_data_v1 data; > +} __packed; > + > /* Bit indices for buttons and switches.*/ > /* Buttons */ > #define EC_MKBP_POWER_BUTTON 0 > @@ -2828,6 +2855,82 @@ struct ec_params_reboot_ec { > /* Current version of ACPI memory address space */ > #define EC_ACPI_MEM_VERSION_CURRENT 1 > > +/*****************************************************************************/ > +/* > + * HDMI CEC commands > + * > + * These commands are for sending and receiving message via HDMI CEC > + */ > +#define MAX_CEC_MSG_LEN 16 > + > +/* CEC message from the AP to be written on the CEC bus */ > +#define EC_CMD_CEC_WRITE_MSG 0x00B8 > + > +/** > + * struct ec_params_cec_write - Message to write to the CEC bus > + * @msg: message content to write to the CEC bus > + */ > +struct ec_params_cec_write { > + uint8_t msg[MAX_CEC_MSG_LEN]; > +} __packed; > + > +/* Set various CEC parameters */ > +#define EC_CMD_CEC_SET 0x00BA > + > +/** > + * struct ec_params_cec_set - CEC parameters set > + * @cmd: parameter type, can be CEC_CMD_ENABLE or CEC_CMD_LOGICAL_ADDRESS > + * @enable: in case cmd is CEC_CMD_ENABLE, this field can be 0 to disable CEC > + * or 1 to enable CEC functionnality > + * @address: in case cmd is CEC_CMD_LOGICAL_ADDRESS, this field encodes the > + * requested logical address between 0 and 15 or 0xff to unregister > + */ > +struct ec_params_cec_set { > + uint8_t cmd; /* enum cec_command */ > + union { > + uint8_t enable; > + uint8_t address; > + }; > +} __packed; > + > +/* Read various CEC parameters */ > +#define EC_CMD_CEC_GET 0x00BB > + > +/** > + * struct ec_params_cec_get - CEC parameters get > + * @cmd: parameter type, can be CEC_CMD_ENABLE or CEC_CMD_LOGICAL_ADDRESS > + */ > +struct ec_params_cec_get { > + uint8_t cmd; /* enum cec_command */ > +} __packed; > + > +/** > + * struct ec_response_cec_get - CEC parameters get response > + * @enable: in case cmd was CEC_CMD_ENABLE, this field will 0 if CEC is > + * disabled or 1 if CEC functionnality is enabled > + * @address: in case cmd was CEC_CMD_LOGICAL_ADDRESS, this will encode the > + * configured logical address between 0 and 15 or 0xff if unregistered > + */ > +struct ec_response_cec_get { > + union { > + uint8_t enable; > + uint8_t address; > + }; > +} __packed; > + > +/* CEC parameters command */ > +enum cec_command { > + /* CEC reading, writing and events enable */ > + CEC_CMD_ENABLE, > + /* CEC logical address */ > + CEC_CMD_LOGICAL_ADDRESS, > +}; > + > +/* Events from CEC to AP */ > +enum mkbp_cec_event { > + EC_MKBP_CEC_SEND_OK = BIT(0), > + EC_MKBP_CEC_SEND_FAILED = BIT(1), > +}; > > /*****************************************************************************/ > /* > -- > 2.7.4 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index e7bbdf9..c4f6c44 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -504,10 +504,31 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, } EXPORT_SYMBOL(cros_ec_cmd_xfer_status); +static int get_next_event_xfer(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg, + int version, uint32_t size) +{ + int ret; + + msg->version = version; + msg->command = EC_CMD_GET_NEXT_EVENT; + msg->insize = size; + msg->outsize = 0; + + ret = cros_ec_cmd_xfer(ec_dev, msg); + if (ret > 0) { + ec_dev->event_size = ret - 1; + memcpy(&ec_dev->event_data, msg->data, ec_dev->event_size); + } + + return ret; +} + static int get_next_event(struct cros_ec_device *ec_dev) { u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)]; struct cros_ec_command *msg = (struct cros_ec_command *)&buffer; + static int cmd_version = 1; int ret; if (ec_dev->suspended) { @@ -515,18 +536,19 @@ static int get_next_event(struct cros_ec_device *ec_dev) return -EHOSTDOWN; } - msg->version = 0; - msg->command = EC_CMD_GET_NEXT_EVENT; - msg->insize = sizeof(ec_dev->event_data); - msg->outsize = 0; + if (cmd_version == 1) { + ret = get_next_event_xfer(ec_dev, msg, cmd_version, + sizeof(struct ec_response_get_next_event_v1)); + if (ret < 0 || msg->result != EC_RES_INVALID_VERSION) + return ret; - ret = cros_ec_cmd_xfer(ec_dev, msg); - if (ret > 0) { - ec_dev->event_size = ret - 1; - memcpy(&ec_dev->event_data, msg->data, - sizeof(ec_dev->event_data)); + /* Fallback to version 0 for future send attempts */ + cmd_version = 0; } + ret = get_next_event_xfer(ec_dev, msg, cmd_version, + sizeof(struct ec_response_get_next_event)); + return ret; } diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h index f36125e..32caef3 100644 --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h @@ -147,7 +147,7 @@ struct cros_ec_device { bool mkbp_event_supported; struct blocking_notifier_head event_notifier; - struct ec_response_get_next_event event_data; + struct ec_response_get_next_event_v1 event_data; int event_size; u32 host_event_wake_mask; }; diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h index f2edd99..9b8bc4a 100644 --- a/include/linux/mfd/cros_ec_commands.h +++ b/include/linux/mfd/cros_ec_commands.h @@ -804,6 +804,8 @@ enum ec_feature_code { EC_FEATURE_MOTION_SENSE_FIFO = 24, /* EC has RTC feature that can be controlled by host commands */ EC_FEATURE_RTC = 27, + /* EC supports CEC commands */ + EC_FEATURE_CEC = 35, }; #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32)) @@ -2078,6 +2080,12 @@ enum ec_mkbp_event { /* EC sent a sysrq command */ EC_MKBP_EVENT_SYSRQ = 6, + /* Notify the AP that something happened on CEC */ + EC_MKBP_CEC_EVENT = 8, + + /* Send an incoming CEC message to the AP */ + EC_MKBP_EVENT_CEC_MESSAGE = 9, + /* Number of MKBP events */ EC_MKBP_EVENT_COUNT, }; @@ -2093,12 +2101,31 @@ union ec_response_get_next_data { uint32_t sysrq; } __packed; +union ec_response_get_next_data_v1 { + uint8_t key_matrix[16]; + + /* Unaligned */ + uint32_t host_event; + + uint32_t buttons; + uint32_t switches; + uint32_t sysrq; + uint32_t cec_events; + uint8_t cec_message[16]; +} __packed; + struct ec_response_get_next_event { uint8_t event_type; /* Followed by event data if any */ union ec_response_get_next_data data; } __packed; +struct ec_response_get_next_event_v1 { + uint8_t event_type; + /* Followed by event data if any */ + union ec_response_get_next_data_v1 data; +} __packed; + /* Bit indices for buttons and switches.*/ /* Buttons */ #define EC_MKBP_POWER_BUTTON 0 @@ -2828,6 +2855,82 @@ struct ec_params_reboot_ec { /* Current version of ACPI memory address space */ #define EC_ACPI_MEM_VERSION_CURRENT 1 +/*****************************************************************************/ +/* + * HDMI CEC commands + * + * These commands are for sending and receiving message via HDMI CEC + */ +#define MAX_CEC_MSG_LEN 16 + +/* CEC message from the AP to be written on the CEC bus */ +#define EC_CMD_CEC_WRITE_MSG 0x00B8 + +/** + * struct ec_params_cec_write - Message to write to the CEC bus + * @msg: message content to write to the CEC bus + */ +struct ec_params_cec_write { + uint8_t msg[MAX_CEC_MSG_LEN]; +} __packed; + +/* Set various CEC parameters */ +#define EC_CMD_CEC_SET 0x00BA + +/** + * struct ec_params_cec_set - CEC parameters set + * @cmd: parameter type, can be CEC_CMD_ENABLE or CEC_CMD_LOGICAL_ADDRESS + * @enable: in case cmd is CEC_CMD_ENABLE, this field can be 0 to disable CEC + * or 1 to enable CEC functionnality + * @address: in case cmd is CEC_CMD_LOGICAL_ADDRESS, this field encodes the + * requested logical address between 0 and 15 or 0xff to unregister + */ +struct ec_params_cec_set { + uint8_t cmd; /* enum cec_command */ + union { + uint8_t enable; + uint8_t address; + }; +} __packed; + +/* Read various CEC parameters */ +#define EC_CMD_CEC_GET 0x00BB + +/** + * struct ec_params_cec_get - CEC parameters get + * @cmd: parameter type, can be CEC_CMD_ENABLE or CEC_CMD_LOGICAL_ADDRESS + */ +struct ec_params_cec_get { + uint8_t cmd; /* enum cec_command */ +} __packed; + +/** + * struct ec_response_cec_get - CEC parameters get response + * @enable: in case cmd was CEC_CMD_ENABLE, this field will 0 if CEC is + * disabled or 1 if CEC functionnality is enabled + * @address: in case cmd was CEC_CMD_LOGICAL_ADDRESS, this will encode the + * configured logical address between 0 and 15 or 0xff if unregistered + */ +struct ec_response_cec_get { + union { + uint8_t enable; + uint8_t address; + }; +} __packed; + +/* CEC parameters command */ +enum cec_command { + /* CEC reading, writing and events enable */ + CEC_CMD_ENABLE, + /* CEC logical address */ + CEC_CMD_LOGICAL_ADDRESS, +}; + +/* Events from CEC to AP */ +enum mkbp_cec_event { + EC_MKBP_CEC_SEND_OK = BIT(0), + EC_MKBP_CEC_SEND_FAILED = BIT(1), +}; /*****************************************************************************/ /*