333 lines
8.1 KiB
C
333 lines
8.1 KiB
C
/*
|
|
* 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_dcs_write - send DCS write command
|
|
* @dsi: DSI device
|
|
* @data: pointer to the command followed by parameters
|
|
* @len: length of @data
|
|
*/
|
|
ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data,
|
|
size_t len)
|
|
{
|
|
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
|
|
struct mipi_dsi_msg msg = {
|
|
.channel = dsi->channel,
|
|
.tx_buf = data,
|
|
.tx_len = len
|
|
};
|
|
|
|
if (!ops || !ops->transfer)
|
|
return -ENOSYS;
|
|
|
|
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;
|
|
}
|
|
|
|
if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
|
|
msg.flags = MIPI_DSI_MSG_USE_LPM;
|
|
|
|
return ops->transfer(dsi->host, &msg);
|
|
}
|
|
EXPORT_SYMBOL(mipi_dsi_dcs_write);
|
|
|
|
/**
|
|
* mipi_dsi_dcs_read - send DCS read request command
|
|
* @dsi: DSI device
|
|
* @cmd: DCS read command
|
|
* @data: pointer to read buffer
|
|
* @len: length of @data
|
|
*
|
|
* Function returns number of read bytes or error code.
|
|
*/
|
|
ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
|
|
size_t len)
|
|
{
|
|
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
|
|
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
|
|
};
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(mipi_dsi_dcs_read);
|
|
|
|
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 - register a driver for DSI devices
|
|
* @drv: DSI driver structure
|
|
*/
|
|
int mipi_dsi_driver_register(struct mipi_dsi_driver *drv)
|
|
{
|
|
drv->driver.bus = &mipi_dsi_bus_type;
|
|
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);
|
|
|
|
/**
|
|
* mipi_dsi_driver_unregister - unregister a driver for DSI devices
|
|
* @drv: DSI driver structure
|
|
*/
|
|
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");
|