drm/dsi: Implement generic read and write commands
authorThierry Reding <treding@nvidia.com>
Tue, 5 Aug 2014 08:36:21 +0000 (10:36 +0200)
committerThierry Reding <treding@nvidia.com>
Thu, 13 Nov 2014 12:55:51 +0000 (13:55 +0100)
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>
drivers/gpu/drm/drm_mipi_dsi.c
include/drm/drm_mipi_dsi.h

index 60177a3e16be09a4a561df886ae95afbc4387682..dcc15e16181676a86083745ed98875135651e150 100644 (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
index 4a4e9d7ccc16723daa2c470cfd59f31f447719ba..524655509cf17b10f1e0b16eb36b1530680db301 100644 (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,