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|
/*
* 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>
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 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);
/**
* 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)
{
const u8 *tx = msg->tx_buf;
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.
|