/*
* 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)
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
* @channel: virtual channel
* @data: pointer to the command followed by parameters
* @len: length of @data
*/
int mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, unsigned int channel,
const void *data, size_t len)
{
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
struct mipi_dsi_msg msg = {
.channel = 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;
}
return ops->transfer(dsi->host, &msg);
}
EXPORT_SYMBOL(mipi_dsi_dcs_write);
/**
* mipi_dsi_dcs_read - send DCS read request command
* @dsi: DSI device
* @channel: virtual channel
* @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, unsigned int channel,
u8 cmd, void *data, size_t len)
{
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
struct mipi_dsi_msg msg = {
.channel = channel,
.type = MIPI_DSI_DCS_READ,
.tx_buf = &cmd,
.tx_len = 1,
.rx_buf = data,
.rx_len = len
};
if (!ops || !ops->transfer)
return -ENOSYS;
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);
}
/**
* 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;
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");
