/*
* MIPI DSI Bus
*
* Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
* Andrzej Hajda <a.hajda@samsung.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <drm/drm_mipi_dsi.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <video/mipi_display.h>
/**
* DOC: dsi helpers
*
* These functions contain some common logic and helpers to deal with MIPI DSI
* peripherals.
*
* Helpers are provided for a number of standard MIPI DSI command as well as a
* subset of the MIPI DCS command set.
*/
static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
{
return of_driver_match_device(dev, drv);
}
static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
.runtime_suspend = pm_generic_runtime_suspend,
.runtime_resume = pm_generic_runtime_resume,
.suspend = pm_generic_suspend,
.resume = pm_generic_resume,
.freeze = pm_generic_freeze,
.thaw = pm_generic_thaw,
.poweroff = pm_generic_poweroff,
.restore = pm_generic_restore,
};
static struct bus_type mipi_dsi_bus_type = {
.name = "mipi-dsi",
.match = mipi_dsi_device_match,
.pm = &mipi_dsi_device_pm_ops,
};
static int of_device_match(struct device *dev, void *data)
{
return dev->of_node == data;
}
/**
* of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
* device tree node
* @np: device tree node
*
* Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
* such device exists (or has not been registered yet).
*/
struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
{
struct device *dev;
dev = bus_find_device(&mipi_dsi_bus_type, NULL, np, of_device_match);
return dev ? to_mipi_dsi_device(dev) : NULL;
}
EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
static void mipi_dsi_dev_release(struct device *dev)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
of_node_put(dev->of_node);
kfree(dsi);
}
static const struct device_type mipi_dsi_device_type = {
.release = mipi_dsi_dev_release,
};
static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host)
{
struct mipi_dsi_device *dsi;
dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
if (!dsi)
return ERR_PTR(-ENOMEM);
dsi->host = host;
dsi->dev.bus = &mipi_dsi_bus_type;
dsi->dev.parent = host->dev;
dsi->dev.type = &mipi_dsi_device_type;
device_initialize(&dsi->dev);
return dsi;
}
static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
{
struct mipi_dsi_host *host = dsi->host;
dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), dsi->channel);
return device_add(&dsi->dev);
}
static struct mipi_dsi_device *
of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
{
struct mipi_dsi_device *dsi;
struct device *dev = host->dev;
int ret;
u32 reg;
ret = of_property_read_u32(node, "reg", ®);
if (ret) {
dev_err(dev, "device node %s has no valid reg property: %d\n",
node->full_name, ret);
return ERR_PTR(-EINVAL);
}
if (reg > 3) {
dev_err(dev, "device node %s has invalid reg property: %u\n",
node->full_name, reg);
return ERR_PTR(-EINVAL);
}
dsi = mipi_dsi_device_alloc(host);
if (IS_ERR(dsi)) {
dev_err(dev, "failed to allocate DSI device %s: %ld\n",
node->full_name, PTR_ERR(dsi));
return dsi;
}
dsi->dev.of_node = of_node_get(node);
dsi->channel = reg;
ret = mipi_dsi_device_add(dsi);
if (ret) {
dev_err(dev, "failed to add DSI device %s: %d\n",
node->full_name, ret);
kfree(dsi);
return ERR_PTR(ret);
}
return dsi;
}
int mipi_dsi_host_register(struct mipi_dsi_host *host)
{
struct device_node *node;
for_each_available_child_of_node(host->dev->of_node, node) {
/* skip nodes without reg property */
if (!of_find_property(node, "reg", NULL))
continue;
of_mipi_dsi_device_add(host, node);
}
return 0;
}
EXPORT_SYMBOL(mipi_dsi_host_register);
static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
device_unregister(&dsi->dev);
return 0;
}
void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
{
device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
}
EXPORT_SYMBOL(mipi_dsi_host_unregister);
/**
* mipi_dsi_attach - attach a DSI device to its DSI host
* @dsi: DSI peripheral
*/
int mipi_dsi_attach(struct mipi_dsi_device *dsi)
{
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
if (!ops || !ops->attach)
return -ENOSYS;
return ops->attach(dsi->host, dsi);
}
EXPORT_SYMBOL(mipi_dsi_attach);
/**
* mipi_dsi_detach - detach a DSI device from its DSI host
* @dsi: DSI peripheral
*/
int mipi_dsi_detach(struct mipi_dsi_device *dsi)
{
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
if (!ops || !ops->detach)
return -ENOSYS;
return ops->detach(dsi->host, dsi);
}
EXPORT_SYMBOL(mipi_dsi_detach);
static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
struct mipi_dsi_msg *msg)
{
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
if (!ops || !ops->transfer)
return -ENOSYS;
if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
msg->flags |= MIPI_DSI_MSG_USE_LPM;
return ops->transfer(dsi->host, msg);
}
/**
* mipi_dsi_packet_format_is_short - check if a packet is of the short format
* @type: MIPI DSI data type of the packet
*
* Return: true if the packet for the given data type is a short packet, false
* otherwise.
*/
bool mipi_dsi_packet_format_is_short(u8 type)
{
switch (type) {
case MIPI_DSI_V_SYNC_START:
case MIPI_DSI_V_SYNC_END:
case MIPI_DSI_H_SYNC_START:
case MIPI_DSI_H_SYNC_END:
case MIPI_DSI_END_OF_TRANSMISSION:
case MIPI_DSI_COLOR_MODE_OFF:
case MIPI_DSI_COLOR_MODE_ON:
case MIPI_DSI_SHUTDOWN_PERIPHERAL:
case MIPI_DSI_TURN_ON_PERIPHERAL:
case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
case MIPI_DSI_DCS_SHORT_WRITE:
case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
case MIPI_DSI_DCS_READ:
case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
return true;
}
return false;
}
EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
/**
* mipi_dsi_packet_format_is_long - check if a packet is of the long format
* @type: MIPI DSI data type of the packet
*
* Return: true if the packet for the given data type is a long packet, false
* otherwise.
*/
bool mipi_dsi_packet_format_is_long(u8 type)
{
switch (type) {
case MIPI_DSI_NULL_PACKET:
case MIPI_DSI_BLANKING_PACKET:
case MIPI_DSI_GENERIC_LONG_WRITE:
case MIPI_DSI_DCS_LONG_WRITE:
case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
case MIPI_DSI_PACKED_PIXEL_STREAM_30:
case MIPI_DSI_PACKED_PIXEL_STREAM_36:
case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
case MIPI_DSI_PACKED_PIXEL_STREAM_16:
case MIPI_DSI_PACKED_PIXEL_STREAM_18:
case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
case MIPI_DSI_PACKED_PIXEL_STREAM_24:
return true;
}
return false;
}
EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
/**
* mipi_dsi_create_packet - create a packet from a message according to the
* DSI protocol
* @packet: pointer to a DSI packet structure
* @msg: message to translate into a packet
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
const struct mipi_dsi_msg *msg)
{
if (!packet || !msg)
return -EINVAL;
/* do some minimum sanity checking */
if (!mipi_dsi_packet_format_is_short(msg->type) &&
!mipi_dsi_packet_format_is_long(msg->type))
return -EINVAL;
if (msg->channel > 3)
return -EINVAL;
memset(packet, 0, sizeof(*packet));
packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
/* TODO: compute ECC if hardware support is not available */
/*
* Long write packets contain the word count in header bytes 1 and 2.
* The payload follows the header and is word count bytes long.
*
* Short write packets encode up to two parameters in header bytes 1
* and 2.
*/
if (mipi_dsi_packet_format_is_long(msg->type)) {
packet->header[1] = (msg->tx_len >> 0) & 0xff;
packet->header[2] = (msg->tx_len >> 8) & 0xff;
packet->payload_length = msg->tx_len;
packet->payload = msg->tx_buf;
} else {
const u8 *tx = msg->tx_buf;
packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
}
packet->size = sizeof(packet->header) + packet->payload_length;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_create_packet);
/*
* mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
* the payload in a long packet transmitted from the peripheral back to the
* host processor
* @dsi: DSI peripheral device
* @value: the maximum size of the payload
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
u16 value)
{
u8 tx[2] = { value & 0xff, value >> 8 };
struct mipi_dsi_msg msg = {
.channel = dsi->channel,
.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
.tx_len = sizeof(tx),
.tx_buf = tx,
};
return mipi_dsi_device_transfer(dsi, &msg);
}
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
* @data: buffer containing data to be transmitted
* @len: size of transmission buffer
*
* This function will automatically choose the right data type depending on
* the command payload length.
*
* Return: The number of bytes successfully transmitted or a negative error
* code on failure.
*/
ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
const void *data, size_t len)
{
struct mipi_dsi_msg msg = {
.channel = dsi->channel,
.tx_buf = data,
.tx_len = len
};
switch (len) {
case 0:
return -EINVAL;
case 1:
msg.type = MIPI_DSI_DCS_SHORT_WRITE;
break;
case 2:
msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
break;
default:
msg.type = MIPI_DSI_DCS_LONG_WRITE;
break;
}
return mipi_dsi_device_transfer(dsi, &msg);
}
EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
/**
* mipi_dsi_dcs_write() - send DCS write command
* @dsi: DSI peripheral device
* @cmd: DCS command
* @data: buffer containing the command payload
* @len: command payload length
*
* This function will automatically choose the right data type depending on
* the command payload length.
*
* Return: The number of bytes successfully transmitted or a negative error
* code on failure.
*/
ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
const void *data, size_t len)
{
ssize_t err;
size_t size;
u8 *tx;
if (len > 0) {
size = 1 + len;
tx = kmalloc(size, GFP_KERNEL);
if (!tx)
return -ENOMEM;
/* concatenate the DCS command byte and the payload */
tx[0] = cmd;
memcpy(&tx[1], data, len);
} else {
tx = &cmd;
size = 1;
}
err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
if (len > 0)
kfree(tx);
return err;
}
EXPORT_SYMBOL(mipi_dsi_dcs_write);
/**
* mipi_dsi_dcs_read() - send DCS read request command
* @dsi: DSI peripheral device
* @cmd: DCS command
* @data: buffer in which to receive data
* @len: size of receive buffer
*
* Return: The number of bytes read or a negative error code on failure.
*/
ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
size_t len)
{
struct mipi_dsi_msg msg = {
.channel = dsi->channel,
.type = MIPI_DSI_DCS_READ,
.tx_buf = &cmd,
.tx_len = 1,
.rx_buf = data,
.rx_len = len
};
return mipi_dsi_device_transfer(dsi, &msg);
}
EXPORT_SYMBOL(mipi_dsi_dcs_read);
/**
* mipi_dsi_dcs_nop() - send DCS nop packet
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_nop);
/**
* mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
/**
* mipi_dsi_dcs_get_power_mode() - query the display module's current power
* mode
* @dsi: DSI peripheral device
* @mode: return location for the current power mode
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
{
ssize_t err;
err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
sizeof(*mode));
if (err <= 0) {
if (err == 0)
err = -ENODATA;
return err;
}
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
/**
* mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
* data used by the interface
* @dsi: DSI peripheral device
* @format: return location for the pixel format
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
{
ssize_t err;
err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
sizeof(*format));
if (err <= 0) {
if (err == 0)
err = -ENODATA;
return err;
}
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
/**
* mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
* display module except interface communication
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
/**
* mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
* module
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
/**
* mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
* display device
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
/**
* mipi_dsi_dcs_set_display_on() - start displaying the image data on the
* display device
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure
*/
int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
/**
* mipi_dsi_dcs_set_column_address() - define the column extent of the frame
* memory accessed by the host processor
* @dsi: DSI peripheral device
* @start: first column of frame memory
* @end: last column of frame memory
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
u16 end)
{
u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
sizeof(payload));
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
/**
* mipi_dsi_dcs_set_page_address() - define the page extent of the frame
* memory accessed by the host processor
* @dsi: DSI peripheral device
* @start: first page of frame memory
* @end: last page of frame memory
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
u16 end)
{
u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
sizeof(payload));
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
/**
* mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
* output signal on the TE signal line
* @dsi: DSI peripheral device
*
* Return: 0 on success or a negative error code on failure
*/
int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
/**
* mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
* output signal on the TE signal line.
* @dsi: DSI peripheral device
* @mode: the Tearing Effect Output Line mode
*
* Return: 0 on success or a negative error code on failure
*/
int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
enum mipi_dsi_dcs_tear_mode mode)
{
u8 value = mode;
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
sizeof(value));
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
/**
* mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
* data used by the interface
* @dsi: DSI peripheral device
* @format: pixel format
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
{
ssize_t err;
err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
sizeof(format));
if (err < 0)
return err;
return 0;
}
EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
static int mipi_dsi_drv_probe(struct device *dev)
{
struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
return drv->probe(dsi);
}
static int mipi_dsi_drv_remove(struct device *dev)
{
struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
return drv->remove(dsi);
}
static void mipi_dsi_drv_shutdown(struct device *dev)
{
struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
drv->shutdown(dsi);
}
/**
* mipi_dsi_driver_register_full() - register a driver for DSI devices
* @drv: DSI driver structure
* @owner: owner module
*
* Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
struct module *owner)
{
drv->driver.bus = &mipi_dsi_bus_type;
drv->driver.owner = owner;
if (drv->probe)
drv->driver.probe = mipi_dsi_drv_probe;
if (drv->remove)
drv->driver.remove = mipi_dsi_drv_remove;
if (drv->shutdown)
drv->driver.shutdown = mipi_dsi_drv_shutdown;
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(mipi_dsi_driver_register_full);
/**
* mipi_dsi_driver_unregister() - unregister a driver for DSI devices
* @drv: DSI driver structure
*
* Return: 0 on success or a negative error code on failure.
*/
void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(mipi_dsi_driver_unregister);
static int __init mipi_dsi_bus_init(void)
{
return bus_register(&mipi_dsi_bus_type);
}
postcore_initcall(mipi_dsi_bus_init);
MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
MODULE_DESCRIPTION("MIPI DSI Bus");
MODULE_LICENSE("GPL and additional rights");