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drm/dsi: Implement generic read and write commands

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Implement generic read and write commands. Selection of the proper data
type for packets is done automatically based on the number of parameters
or payload length.

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-08-05 10:36:21 +02:00
parent 8677affc6c
commit 550ab84836
2 changed files with 95 additions and 0 deletions
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89
drivers/gpu/drm/drm_mipi_dsi.c
View File

@ -356,6 +356,95 @@ int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
}
EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
/**
* mipi_dsi_generic_write() - transmit data using a generic write packet
* @dsi: DSI peripheral device
* @payload: buffer containing the payload
* @size: size of payload buffer
*
* This function will automatically choose the right data type depending on
* the payload length.
*
* Return: The number of bytes transmitted on success or a negative error code
* on failure.
*/
ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
size_t size)
{
struct mipi_dsi_msg msg = {
.channel = dsi->channel,
.tx_buf = payload,
.tx_len = size
};
switch (size) {
case 0:
msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
break;
case 1:
msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
break;
case 2:
msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
break;
default:
msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
break;
}
return mipi_dsi_device_transfer(dsi, &msg);
}
EXPORT_SYMBOL(mipi_dsi_generic_write);
/**
* mipi_dsi_generic_read() - receive data using a generic read packet
* @dsi: DSI peripheral device
* @params: buffer containing the request parameters
* @num_params: number of request parameters
* @data: buffer in which to return the received data
* @size: size of receive buffer
*
* This function will automatically choose the right data type depending on
* the number of parameters passed in.
*
* Return: The number of bytes successfully read or a negative error code on
* failure.
*/
ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
size_t num_params, void *data, size_t size)
{
struct mipi_dsi_msg msg = {
.channel = dsi->channel,
.tx_len = num_params,
.tx_buf = params,
.rx_len = size,
.rx_buf = data
};
switch (num_params) {
case 0:
msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
break;
case 1:
msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
break;
case 2:
msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
break;
default:
return -EINVAL;
}
return mipi_dsi_device_transfer(dsi, &msg);
}
EXPORT_SYMBOL(mipi_dsi_generic_read);
/**
* mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
* @dsi: DSI peripheral device

6
include/drm/drm_mipi_dsi.h
View File

@ -155,6 +155,12 @@ int mipi_dsi_attach(struct mipi_dsi_device *dsi);
int mipi_dsi_detach(struct mipi_dsi_device *dsi);
int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
u16 value);
ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
size_t size);
ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
size_t num_params, void *data, size_t size);
ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
const void *data, size_t len);
ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,