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/*
* Copyright (C) ST-Ericsson SA 2010
*
* ST-Ericsson MCDE generic DCS 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/delay.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <video/mcde_display.h>
#include <video/mcde_display-generic_dsi.h>
static int generic_platform_enable(struct mcde_display_device *dev)
{
struct mcde_display_generic_platform_data *pdata =
dev->dev.platform_data;
dev_dbg(&dev->dev, "%s: Reset & power on generic display\n", __func__);
if (pdata->regulator) {
if (regulator_enable(pdata->regulator) < 0) {
dev_err(&dev->dev, "%s:Failed to enable regulator\n"
, __func__);
return -EINVAL;
}
}
if (pdata->reset_gpio)
gpio_set_value_cansleep(pdata->reset_gpio, pdata->reset_high);
mdelay(pdata->reset_delay);
if (pdata->reset_gpio)
gpio_set_value_cansleep(pdata->reset_gpio, !pdata->reset_high);
return 0;
}
static int generic_platform_disable(struct mcde_display_device *dev)
{
struct mcde_display_generic_platform_data *pdata =
dev->dev.platform_data;
dev_dbg(&dev->dev, "%s:Reset & power off generic display\n", __func__);
if (pdata->regulator) {
if (regulator_disable(pdata->regulator) < 0) {
dev_err(&dev->dev, "%s:Failed to disable regulator\n"
, __func__);
return -EINVAL;
}
}
return 0;
}
static int generic_set_power_mode(struct mcde_display_device *ddev,
enum mcde_display_power_mode power_mode)
{
int ret = 0;
struct mcde_display_generic_platform_data *pdata =
ddev->dev.platform_data;
dev_dbg(&ddev->dev, "%s:Set Power mode\n", __func__);
/* OFF -> STANDBY */
if (ddev->power_mode == MCDE_DISPLAY_PM_OFF &&
power_mode != MCDE_DISPLAY_PM_OFF) {
if (ddev->platform_enable) {
ret = ddev->platform_enable(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 = mcde_dsi_dcs_write(ddev->chnl_state,
DCS_CMD_EXIT_SLEEP_MODE, NULL, 0);
if (ret)
return ret;
msleep(pdata->sleep_out_delay);
ret = mcde_dsi_dcs_write(ddev->chnl_state,
DCS_CMD_SET_DISPLAY_ON, NULL, 0);
if (ret)
return ret;
ddev->power_mode = MCDE_DISPLAY_PM_ON;
goto set_power_and_exit;
}
/* ON -> STANDBY */
else if (ddev->power_mode == MCDE_DISPLAY_PM_ON &&
power_mode <= MCDE_DISPLAY_PM_STANDBY) {
ret = mcde_dsi_dcs_write(ddev->chnl_state,
DCS_CMD_SET_DISPLAY_OFF, NULL, 0);
if (ret)
return ret;
ret = mcde_dsi_dcs_write(ddev->chnl_state,
DCS_CMD_ENTER_SLEEP_MODE, NULL, 0);
if (ret)
return ret;
ddev->power_mode = MCDE_DISPLAY_PM_STANDBY;
}
/* SLEEP -> OFF */
if (ddev->power_mode == MCDE_DISPLAY_PM_STANDBY &&
power_mode == MCDE_DISPLAY_PM_OFF) {
if (ddev->platform_disable) {
ret = ddev->platform_disable(ddev);
if (ret)
return ret;
}
ddev->power_mode = MCDE_DISPLAY_PM_OFF;
}
set_power_and_exit:
mcde_chnl_set_power_mode(ddev->chnl_state, ddev->power_mode);
return ret;
}
static int __devinit generic_probe(struct mcde_display_device *dev)
{
int ret = 0;
struct mcde_display_generic_platform_data *pdata =
dev->dev.platform_data;
if (pdata == NULL) {
dev_err(&dev->dev, "%s:Platform data missing\n", __func__);
return -EINVAL;
}
if (dev->port->type != MCDE_PORTTYPE_DSI) {
dev_err(&dev->dev,
"%s:Invalid port type %d\n",
__func__, dev->port->type);
return -EINVAL;
}
if (!dev->platform_enable && !dev->platform_disable) {
pdata->generic_platform_enable = true;
if (pdata->reset_gpio) {
ret = gpio_request(pdata->reset_gpio, NULL);
if (ret) {
dev_warn(&dev->dev,
"%s:Failed to request gpio %d\n",
__func__, pdata->reset_gpio);
goto gpio_request_failed;
}
gpio_direction_output(pdata->reset_gpio,
!pdata->reset_high);
}
if (pdata->regulator_id) {
pdata->regulator = regulator_get(&dev->dev,
pdata->regulator_id);
if (IS_ERR(pdata->regulator)) {
ret = PTR_ERR(pdata->regulator);
dev_warn(&dev->dev,
"%s:Failed to get regulator '%s'\n",
__func__, pdata->regulator_id);
pdata->regulator = NULL;
goto regulator_get_failed;
}
if (regulator_set_voltage(pdata->regulator,
pdata->min_supply_voltage,
pdata->max_supply_voltage) < 0) {
int volt;
dev_warn(&dev->dev,
"%s:Failed to set voltage '%s'\n",
__func__, pdata->regulator_id);
volt = regulator_get_voltage(pdata->regulator);
dev_warn(&dev->dev,
"Voltage:%d\n", volt);
}
/*
* When u-boot has display a startup screen.
* U-boot has turned on display power however the
* regulator framework does not know about that
* This is the case here, the display driver has to
* enable the regulator for the display.
*/
if (dev->power_mode == MCDE_DISPLAY_PM_STANDBY) {
ret = regulator_enable(pdata->regulator);
if (ret < 0) {
dev_err(&dev->dev,
"%s:Failed to enable regulator\n"
, __func__);
goto regulator_enable_failed;
}
}
}
}
dev->platform_enable = generic_platform_enable,
dev->platform_disable = generic_platform_disable,
dev->set_power_mode = generic_set_power_mode;
dev_info(&dev->dev, "Generic display probed\n");
goto out;
regulator_enable_failed:
regulator_get_failed:
if (pdata->generic_platform_enable && pdata->reset_gpio)
gpio_free(pdata->reset_gpio);
gpio_request_failed:
out:
return ret;
}
static int __devexit generic_remove(struct mcde_display_device *dev)
{
struct mcde_display_generic_platform_data *pdata =
dev->dev.platform_data;
dev->set_power_mode(dev, MCDE_DISPLAY_PM_OFF);
if (!pdata->generic_platform_enable)
return 0;
if (pdata->regulator)
regulator_put(pdata->regulator);
if (pdata->reset_gpio) {
gpio_direction_input(pdata->reset_gpio);
gpio_free(pdata->reset_gpio);
}
return 0;
}
#if !defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)
static int generic_resume(struct mcde_display_device *ddev)
{
int ret;
/* set_power_mode will handle call platform_enable */
ret = ddev->set_power_mode(ddev, MCDE_DISPLAY_PM_STANDBY);
if (ret < 0)
dev_warn(&ddev->dev, "%s:Failed to resume display\n"
, __func__);
return ret;
}
static int generic_suspend(struct mcde_display_device *ddev, pm_message_t state)
{
int ret;
/* set_power_mode will handle call platform_disable */
ret = ddev->set_power_mode(ddev, MCDE_DISPLAY_PM_OFF);
if (ret < 0)
dev_warn(&ddev->dev, "%s:Failed to suspend display\n"
, __func__);
return ret;
}
#endif
static struct mcde_display_driver generic_driver = {
.probe = generic_probe,
.remove = generic_remove,
#if !defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)
.suspend = generic_suspend,
.resume = generic_resume,
#else
.suspend = NULL,
.resume = NULL,
#endif
.driver = {
.name = "mcde_disp_generic",
},
};
/* Module init */
static int __init mcde_display_generic_init(void)
{
pr_info("%s\n", __func__);
return mcde_display_driver_register(&generic_driver);
}
module_init(mcde_display_generic_init);
static void __exit mcde_display_generic_exit(void)
{
pr_info("%s\n", __func__);
mcde_display_driver_unregister(&generic_driver);
}
module_exit(mcde_display_generic_exit);
MODULE_AUTHOR("Marcus Lorentzon <marcus.xm.lorentzon@stericsson.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ST-Ericsson MCDE generic DCS display driver");
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