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/*
* drivers/video/ds90uh925q_ser.c
* FPDLink Serializer driver
*
* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/resource.h>
#include <linux/platform_device.h>
#include <linux/nvhost.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c/ds90uh925q_ser.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#define LVDS_SER_REG_CONFIG_1 0x4
#define LVDS_SER_REG_CONFIG_1_BKWD_OVERRIDE 3
#define LVDS_SER_REG_CONFIG_1_BKWD 2
#define LVDS_SER_REG_DATA_PATH_CTRL 0x12
#define LVDS_SER_REG_DATA_PATH_CTRL_PASS_RGB 6
#define LVDS_SER_REG_CONFIG_0 0x3
#define LVDS_SER_REG_CONFIG_0_TRFB 0
struct ds90uh925q_rec {
struct ds90uh925q_platform_data *pdata;
};
static int ser_i2c_read(struct i2c_client *client, int reg, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
return ret;
}
*val = ret;
return 0;
}
static int ser_i2c_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret)
dev_err(&client->dev, "failed to write\n");
return ret;
}
static int lvds_ser_config(struct i2c_client *client,
bool is_fpdlinkII,
bool support_hdcp,
bool clk_rise_edge)
{
u8 val;
int err = 0;
if (is_fpdlinkII) {
err = ser_i2c_read(client, LVDS_SER_REG_CONFIG_1, &val);
if (err < 0)
return err;
val |= (1 << LVDS_SER_REG_CONFIG_1_BKWD_OVERRIDE);
val |= (1 << LVDS_SER_REG_CONFIG_1_BKWD);
err = ser_i2c_write(client, LVDS_SER_REG_CONFIG_1, val);
if (err < 0)
return err;
} else if (!support_hdcp) {
err = ser_i2c_read(client, LVDS_SER_REG_DATA_PATH_CTRL, &val);
if (err < 0)
return err;
val |= (1 << LVDS_SER_REG_DATA_PATH_CTRL_PASS_RGB);
err = ser_i2c_write(client, LVDS_SER_REG_DATA_PATH_CTRL, val);
if (err < 0)
return err;
}
if (clk_rise_edge) {
err = ser_i2c_read(client, LVDS_SER_REG_CONFIG_0, &val);
if (err < 0)
return err;
val |= (1 << LVDS_SER_REG_CONFIG_0_TRFB);
err = ser_i2c_write(client, LVDS_SER_REG_CONFIG_0, val);
}
return (err < 0 ? err : 0);
}
static int ds90uh925q_enable(struct i2c_client *client)
{
struct ds90uh925q_rec *data = i2c_get_clientdata(client);
int err;
/* Turn on serializer chip */
if (data->pdata->has_lvds_en_gpio)
gpio_set_value(data->pdata->lvds_en_gpio, 1);
err = lvds_ser_config(client,
data->pdata->is_fpdlinkII,
data->pdata->support_hdcp,
data->pdata->clk_rise_edge);
if (err)
pr_err("%s: lvds failed\n", __func__);
return err;
}
static void ds90uh925q_disable(struct i2c_client *client)
{
struct ds90uh925q_rec *data = i2c_get_clientdata(client);
/* Turn off serializer chip */
if (data->pdata->has_lvds_en_gpio)
gpio_set_value(data->pdata->lvds_en_gpio, 0);
}
static int ds90uh925q_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ds90uh925q_rec *data;
struct ds90uh925q_platform_data *pdata =
client->dev.platform_data;
int err;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
return -EIO;
}
if (!pdata) {
dev_err(&client->dev, "no platform data?\n");
return -EINVAL;
}
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
data->pdata = pdata;
i2c_set_clientdata(client, data);
err = ds90uh925q_enable(client);
if (err)
goto err_out;
return 0;
err_out:
i2c_set_clientdata(client, NULL);
return err;
}
static int ds90uh925q_remove(struct i2c_client *client)
{
struct ds90uh925q_rec *data = i2c_get_clientdata(client);
ds90uh925q_disable(client);
i2c_set_clientdata(client, NULL);
return 0;
}
static int ds90uh925q_suspend(struct i2c_client *client, pm_message_t message)
{
ds90uh925q_disable(client);
return 0;
}
static int ds90uh925q_resume(struct i2c_client *client)
{
return ds90uh925q_enable(client);
}
static const struct i2c_device_id ds90uh925q_id[] = {
{ "ds90uh925q", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ds90uh925q_id);
static struct i2c_driver ds90uh925q_driver = {
.driver = {
.name = "ds90uh925q",
.owner = THIS_MODULE,
},
.probe = ds90uh925q_probe,
.remove = ds90uh925q_remove,
.suspend = ds90uh925q_suspend,
.resume = ds90uh925q_resume,
.id_table = ds90uh925q_id,
};
module_i2c_driver(ds90uh925q_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DS90UH925Q FPDLink Serializer driver");
MODULE_ALIAS("i2c:ds90uh925q_ser");
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