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/*
* Copyright (C) ST-Ericsson SA 2010
*
* ST-Ericsson MCDE Samsung S6D16D0 display driver
*
* Author: Marcus Lorentzon <marcus.xm.lorentzon@stericsson.com>
* for ST-Ericsson.
*
* License terms: GNU General Public License (GPL), version 2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <video/mcde_display.h>
#define RESET_DURATION_US 10
#define RESET_DELAY_MS 120
#define SLEEP_OUT_DELAY_MS 120
#define IO_REGU "vdd1"
#define IO_REGU_MIN 1650000
#define IO_REGU_MAX 3300000
#define DSI_HS_FREQ_HZ 420160000
#define DSI_LP_FREQ_HZ 19200000
struct device_info {
int reset_gpio;
struct mcde_port port;
struct regulator *regulator;
};
static inline struct device_info *get_drvdata(struct mcde_display_device *ddev)
{
return (struct device_info *)dev_get_drvdata(&ddev->dev);
}
static int power_on(struct mcde_display_device *ddev)
{
struct device_info *di = get_drvdata(ddev);
dev_dbg(&ddev->dev, "Reset & power on s6d16d0 display\n");
regulator_enable(di->regulator);
gpio_set_value_cansleep(di->reset_gpio, 0);
udelay(RESET_DURATION_US);
gpio_set_value_cansleep(di->reset_gpio, 1);
msleep(RESET_DELAY_MS);
return 0;
}
static int power_off(struct mcde_display_device *ddev)
{
struct device_info *di = get_drvdata(ddev);
dev_dbg(&ddev->dev, "Power off s6d16d0 display\n");
regulator_disable(di->regulator);
return 0;
}
static int display_on(struct mcde_display_device *ddev)
{
int ret;
u8 val = 0;
dev_dbg(&ddev->dev, "Display on s6d16d0\n");
ret = mcde_dsi_dcs_write(ddev->chnl_state,
DCS_CMD_SET_TEAR_ON, &val, 1);
if (ret)
dev_warn(&ddev->dev,
"%s:Failed to enable synchronized update\n", __func__);
ret = mcde_dsi_dcs_write(ddev->chnl_state, DCS_CMD_EXIT_SLEEP_MODE,
NULL, 0);
if (ret)
return ret;
msleep(SLEEP_OUT_DELAY_MS);
return mcde_dsi_dcs_write(ddev->chnl_state, DCS_CMD_SET_DISPLAY_ON,
NULL, 0);
}
static int display_off(struct mcde_display_device *ddev)
{
int ret;
dev_dbg(&ddev->dev, "Display off s6d16d0\n");
ret = mcde_dsi_dcs_write(ddev->chnl_state, DCS_CMD_SET_DISPLAY_OFF,
NULL, 0);
if (ret)
return ret;
return mcde_dsi_dcs_write(ddev->chnl_state, DCS_CMD_ENTER_SLEEP_MODE,
NULL, 0);
}
static int set_power_mode(struct mcde_display_device *ddev,
enum mcde_display_power_mode power_mode)
{
int ret = 0;
dev_dbg(&ddev->dev, "Set power mode %d\n", power_mode);
/* OFF -> STANDBY */
if (ddev->power_mode == MCDE_DISPLAY_PM_OFF &&
power_mode != MCDE_DISPLAY_PM_OFF) {
ret = power_on(ddev);
if (ret)
return ret;
ddev->power_mode = MCDE_DISPLAY_PM_STANDBY;
}
/* STANDBY -> ON */
if (ddev->power_mode == MCDE_DISPLAY_PM_STANDBY &&
power_mode == MCDE_DISPLAY_PM_ON) {
ret = display_on(ddev);
if (ret)
return ret;
ddev->power_mode = MCDE_DISPLAY_PM_ON;
}
/* ON -> STANDBY */
else if (ddev->power_mode == MCDE_DISPLAY_PM_ON &&
power_mode <= MCDE_DISPLAY_PM_STANDBY) {
ret = display_off(ddev);
if (ret)
return ret;
ddev->power_mode = MCDE_DISPLAY_PM_STANDBY;
}
/* STANDBY -> OFF */
if (ddev->power_mode == MCDE_DISPLAY_PM_STANDBY &&
power_mode == MCDE_DISPLAY_PM_OFF) {
ret = power_off(ddev);
if (ret)
return ret;
ddev->power_mode = MCDE_DISPLAY_PM_OFF;
}
return mcde_chnl_set_power_mode(ddev->chnl_state, ddev->power_mode);
}
static int __devinit samsung_s6d16d0_probe(struct mcde_display_device *ddev)
{
int ret = 0;
struct mcde_display_dsi_platform_data *pdata = ddev->dev.platform_data;
struct device_info *di;
if (pdata == NULL || !pdata->reset_gpio) {
dev_err(&ddev->dev, "Invalid platform data\n");
return -EINVAL;
}
di = kzalloc(sizeof(*di), GFP_KERNEL);
if (!di)
return -ENOMEM;
di->reset_gpio = pdata->reset_gpio;
di->port.link = pdata->link;
di->port.type = MCDE_PORTTYPE_DSI;
di->port.mode = MCDE_PORTMODE_CMD;
di->port.pixel_format = MCDE_PORTPIXFMT_DSI_24BPP;
di->port.sync_src = ddev->port->sync_src;
di->port.frame_trig = ddev->port->frame_trig;
di->port.phy.dsi.num_data_lanes = 2;
di->port.phy.dsi.host_eot_gen = true;
/* TODO: Move UI to mcde_hw.c when clk_get_rate(dsi) is done */
di->port.phy.dsi.ui = 9;
di->port.phy.dsi.hs_freq = DSI_HS_FREQ_HZ;
di->port.phy.dsi.lp_freq = DSI_LP_FREQ_HZ;
ret = gpio_request(di->reset_gpio, NULL);
if (ret)
goto gpio_request_failed;
gpio_direction_output(di->reset_gpio, 1);
di->regulator = regulator_get(&ddev->dev, IO_REGU);
if (IS_ERR(di->regulator)) {
di->regulator = NULL;
goto regulator_get_failed;
}
ret = regulator_set_voltage(di->regulator, IO_REGU_MIN, IO_REGU_MAX);
if (WARN_ON(ret))
goto regulator_voltage_failed;
/* Get in sync with u-boot */
if (ddev->power_mode != MCDE_DISPLAY_PM_OFF)
(void)regulator_enable(di->regulator);
ddev->set_power_mode = set_power_mode;
ddev->port = &di->port;
ddev->native_x_res = 864;
ddev->native_y_res = 480;
dev_set_drvdata(&ddev->dev, di);
dev_info(&ddev->dev, "Samsung s6d16d0 display probed\n");
return 0;
regulator_voltage_failed:
regulator_put(di->regulator);
regulator_get_failed:
gpio_free(di->reset_gpio);
gpio_request_failed:
kfree(di);
return ret;
}
static struct mcde_display_driver samsung_s6d16d0_driver = {
.probe = samsung_s6d16d0_probe,
.driver = {
.name = "samsung_s6d16d0",
},
};
static int __init samsung_s6d16d0_init(void)
{
return mcde_display_driver_register(&samsung_s6d16d0_driver);
}
module_init(samsung_s6d16d0_init);
MODULE_AUTHOR("Marcus Lorentzon <marcus.xm.lorentzon@stericsson.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ST-Ericsson MCDE Samsung S6D16D0 display driver");
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