jbt6k74: * Register a lcd device. * Add callbacks to allow the graphics chip to disable the pixel clock. * Delay blanking to avoid white flash.

SVN-Revision: 16616
lede-17.01
Lars-Peter Clausen 2009-06-29 08:07:56 +00:00
parent 4fdc4703ed
commit 11a2c733f3
1 changed files with 148 additions and 119 deletions

View File

@ -4,6 +4,7 @@
* Author: Harald Welte <laforge@openmoko.org>,
* Stefan Schmidt <stefan@openmoko.org>
* Copyright (C) 2008 by Harald Welte <laforge@openmoko.org>
* Copyright (C) 2009 by Lars-Peter Clausen <lars@metafoo.de>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or
@ -29,8 +30,10 @@
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/jbt6k74.h>
#include <linux/fb.h>
#include <linux/lcd.h>
#include <linux/time.h>
enum jbt_register {
@ -120,14 +123,18 @@ static const char *jbt_resolution_names[] = {
};
struct jbt_info {
struct mutex lock; /* protects this structure */
enum jbt_resolution resolution;
enum jbt_power_mode power_mode;
enum jbt_power_mode suspend_mode;
int suspended;
struct spi_device *spi_dev;
struct mutex lock; /* protects tx_buf and reg_cache */
struct notifier_block fb_notif;
u16 tx_buf[8];
u16 reg_cache[0xEE];
struct lcd_device *lcd_dev;
unsigned long last_sleep;
struct delayed_work blank_work;
int blank_mode;
u16 tx_buf[4];
u16 reg_cache[0xEE];
};
#define JBT_COMMAND 0x000
@ -139,7 +146,7 @@ static int jbt_reg_write_nodata(struct jbt_info *jbt, u8 reg)
jbt->tx_buf[0] = JBT_COMMAND | reg;
rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
1*sizeof(u16));
1*sizeof(u16));
if (rc == 0)
jbt->reg_cache[reg] = 0;
else
@ -157,7 +164,7 @@ static int jbt_reg_write(struct jbt_info *jbt, u8 reg, u8 data)
jbt->tx_buf[0] = JBT_COMMAND | reg;
jbt->tx_buf[1] = JBT_DATA | data;
rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
2*sizeof(u16));
2*sizeof(u16));
if (rc == 0)
jbt->reg_cache[reg] = data;
else
@ -175,7 +182,7 @@ static int jbt_reg_write16(struct jbt_info *jbt, u8 reg, u16 data)
jbt->tx_buf[2] = JBT_DATA | (data & 0xff);
rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
3*sizeof(u16));
3*sizeof(u16));
if (rc == 0)
jbt->reg_cache[reg] = data;
else
@ -207,7 +214,7 @@ static int jbt_init_regs(struct jbt_info *jbt)
* default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
* to avoid red / blue flicker
*/
rc |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x04);
rc |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x04 | (1 << 5));
rc |= jbt_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00);
rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11);
@ -319,11 +326,11 @@ static int normal_to_sleep(struct jbt_info *jbt)
int rc;
/* Make sure we are 120 ms after SLEEP_OUT */
if (time_before(jiffies, jbt->last_sleep))
mdelay(jiffies_to_msecs(jbt->last_sleep - jiffies));
while (time_before(jiffies, jbt->last_sleep))
cpu_relax();
rc = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8002);
rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8000 | 1 << 3);
rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN);
jbt->last_sleep = jiffies + msecs_to_jiffies(120);
@ -338,9 +345,9 @@ static int sleep_to_standby(struct jbt_info *jbt)
return jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00);
}
/* frontend function */
int jbt6k74_enter_power_mode(struct jbt_info *jbt, enum jbt_power_mode new_mode)
{
struct jbt6k74_platform_data *pdata = jbt->spi_dev->dev.platform_data;
int rc = -EINVAL;
dev_dbg(&jbt->spi_dev->dev, "entering (old_state=%s, new_state=%s)\n",
@ -349,6 +356,22 @@ int jbt6k74_enter_power_mode(struct jbt_info *jbt, enum jbt_power_mode new_mode)
mutex_lock(&jbt->lock);
if (jbt->suspended) {
switch (new_mode) {
case JBT_POWER_MODE_DEEP_STANDBY:
case JBT_POWER_MODE_SLEEP:
case JBT_POWER_MODE_NORMAL:
rc = 0;
jbt->suspend_mode = new_mode;
break;
default:
break;
}
} else if (new_mode == JBT_POWER_MODE_NORMAL &&
pdata->enable_pixel_clock) {
pdata->enable_pixel_clock(&jbt->spi_dev->dev, 1);
}
switch (jbt->power_mode) {
case JBT_POWER_MODE_DEEP_STANDBY:
switch (new_mode) {
@ -396,11 +419,15 @@ int jbt6k74_enter_power_mode(struct jbt_info *jbt, enum jbt_power_mode new_mode)
}
}
if (rc == 0)
if (rc == 0) {
jbt->power_mode = new_mode;
else
if (new_mode != JBT_POWER_MODE_NORMAL &&
pdata->enable_pixel_clock)
pdata->enable_pixel_clock(&jbt->spi_dev->dev, 0);
} else {
dev_err(&jbt->spi_dev->dev, "Failed enter state '%s')\n",
jbt_power_mode_names[new_mode]);
}
mutex_unlock(&jbt->lock);
@ -412,15 +439,15 @@ int jbt6k74_set_resolution(struct jbt_info *jbt, enum jbt_resolution new_resolut
int rc = 0;
enum jbt_resolution old_resolution;
mutex_lock(&jbt->lock);
if (jbt->resolution == new_resolution)
return 0;
if (new_resolution != JBT_RESOLUTION_VGA &&
new_resolution != JBT_RESOLUTION_QVGA)
return -EINVAL;
mutex_lock(&jbt->lock);
if (jbt->resolution == new_resolution)
goto out_unlock;
old_resolution = jbt->resolution;
jbt->resolution = new_resolution;
@ -442,44 +469,13 @@ int jbt6k74_set_resolution(struct jbt_info *jbt, enum jbt_resolution new_resolut
}
}
out_unlock:
mutex_unlock(&jbt->lock);
return rc;
}
EXPORT_SYMBOL_GPL(jbt6k74_set_resolution);
static ssize_t power_mode_read(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct jbt_info *jbt = dev_get_drvdata(dev);
if (jbt->power_mode >= ARRAY_SIZE(jbt_power_mode_names))
return -EIO;
return sprintf(buf, "%s\n", jbt_power_mode_names[jbt->power_mode]);
}
static ssize_t power_mode_write(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct jbt_info *jbt = dev_get_drvdata(dev);
int i, rc;
for (i = 0; i < ARRAY_SIZE(jbt_power_mode_names); i++) {
if (!strncmp(buf, jbt_power_mode_names[i],
strlen(jbt_power_mode_names[i]))) {
rc = jbt6k74_enter_power_mode(jbt, i);
if (rc)
return rc;
return count;
}
}
return -EINVAL;
}
static DEVICE_ATTR(power_mode, 0644, power_mode_read, power_mode_write);
static ssize_t resolution_read(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -533,7 +529,7 @@ static ssize_t gamma_read(struct device *dev, struct device_attribute *attr,
mutex_lock(&jbt->lock);
val = jbt->reg_cache[reg];
mutex_unlock(&jbt->lock);
mutex_unlock(&jbt->lock);
return sprintf(buf, "0x%04x\n", val);
}
@ -590,7 +586,6 @@ static DEVICE_ATTR(gamma_blue_offset, 0644, gamma_read, gamma_write);
static DEVICE_ATTR(reset, 0600, NULL, reset_write);
static struct attribute *jbt_sysfs_entries[] = {
&dev_attr_power_mode.attr,
&dev_attr_resolution.attr,
&dev_attr_gamma_fine1.attr,
&dev_attr_gamma_fine2.attr,
@ -605,61 +600,89 @@ static struct attribute_group jbt_attr_group = {
.attrs = jbt_sysfs_entries,
};
static int fb_notifier_callback(struct notifier_block *self,
unsigned long event, void *data)
{
struct jbt_info *jbt;
struct fb_event *evdata = data;
struct fb_info *info;
int fb_blank;
/* FIXME: This in an ugly hack to delay display blanking.
When the jbt is in sleep mode it displays an all white screen and thus one
will a see a short flash.
By delaying the blanking we will give the backlight a chance to turn off and
thus avoid getting the flash */
static void jbt_blank_worker(struct work_struct *work) {
struct jbt_info *jbt = container_of(work, struct jbt_info,
blank_work.work);
jbt = container_of(self, struct jbt_info, fb_notif);
dev_dbg(&jbt->spi_dev->dev, "event=%lu\n", event);
switch (event) {
case FB_EVENT_MODE_CHANGE:
case FB_EVENT_MODE_CHANGE_ALL:
info = evdata->info;
if (info->var.xres == 240 &&
info->var.yres == 320) {
jbt6k74_set_resolution(jbt, JBT_RESOLUTION_QVGA);
} else if (info->var.xres == 480 &&
info->var.yres == 640) {
jbt6k74_set_resolution(jbt, JBT_RESOLUTION_VGA);
} else {
dev_err(&jbt->spi_dev->dev, "Unknown resolution. Entering sleep mode.\n");
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
}
switch (jbt->blank_mode) {
case FB_BLANK_NORMAL:
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
break;
case FB_EVENT_BLANK:
case FB_EVENT_CONBLANK:
fb_blank = *(int *)evdata->data;
switch (fb_blank) {
case FB_BLANK_UNBLANK:
dev_dbg(&jbt->spi_dev->dev, "unblank\n");
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
break;
case FB_BLANK_NORMAL:
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
dev_dbg(&jbt->spi_dev->dev, "blank\n");
break;
case FB_BLANK_VSYNC_SUSPEND:
dev_dbg(&jbt->spi_dev->dev, "vsync suspend\n");
break;
case FB_BLANK_HSYNC_SUSPEND:
dev_dbg(&jbt->spi_dev->dev, "hsync suspend\n");
break;
case FB_BLANK_POWERDOWN:
dev_dbg(&jbt->spi_dev->dev, "powerdown\n");
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
break;
}
case FB_BLANK_POWERDOWN:
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
break;
default:
break;
}
}
static int jbt6k74_set_mode(struct lcd_device *ld, struct fb_videomode *m) {
int rc = -EINVAL;
struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
if (m->xres == 240 && m->yres == 320) {
rc = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_QVGA);
} else if (m->xres == 480 && m->yres == 640) {
rc = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_VGA);
} else {
dev_err(&jbt->spi_dev->dev, "Unknown resolution. Entering sleep mode.\n");
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
}
return 0;
return rc;
}
static int jbt6k74_set_power(struct lcd_device *ld, int power) {
int rc = -EINVAL;
struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
jbt->blank_mode = power;
cancel_rearming_delayed_work(&jbt->blank_work);
switch (power) {
case FB_BLANK_UNBLANK:
dev_dbg(&jbt->spi_dev->dev, "unblank\n");
rc = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
break;
case FB_BLANK_NORMAL:
dev_dbg(&jbt->spi_dev->dev, "blank\n");
rc = schedule_delayed_work(&jbt->blank_work, HZ);
break;
case FB_BLANK_POWERDOWN:
dev_dbg(&jbt->spi_dev->dev, "powerdown\n");
rc = schedule_delayed_work(&jbt->blank_work, HZ);
break;
default:
break;
}
return rc;
}
static int jbt6k74_get_power(struct lcd_device *ld) {
struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
switch (jbt->power_mode) {
case JBT_POWER_MODE_NORMAL:
return FB_BLANK_UNBLANK;
case JBT_POWER_MODE_SLEEP:
return FB_BLANK_NORMAL;
default:
return JBT_POWER_MODE_DEEP_STANDBY;
}
}
struct lcd_ops jbt6k74_lcd_ops = {
.set_power = jbt6k74_set_power,
.get_power = jbt6k74_get_power,
.set_mode = jbt6k74_set_mode,
};
/* linux device model infrastructure */
static int __devinit jbt_probe(struct spi_device *spi)
@ -685,6 +708,17 @@ static int __devinit jbt_probe(struct spi_device *spi)
return -ENOMEM;
jbt->spi_dev = spi;
jbt->lcd_dev = lcd_device_register("jbt6k74-lcd", &spi->dev,
jbt, &jbt6k74_lcd_ops);
if (IS_ERR(jbt->lcd_dev)) {
rc = PTR_ERR(jbt->lcd_dev);
goto err_free_drvdata;
}
INIT_DELAYED_WORK(&jbt->blank_work, jbt_blank_worker);
jbt->resolution = JBT_RESOLUTION_VGA;
jbt->power_mode = JBT_POWER_MODE_DEEP_STANDBY;
jbt->last_sleep = jiffies + msecs_to_jiffies(120);
@ -695,7 +729,7 @@ static int __devinit jbt_probe(struct spi_device *spi)
rc = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
if (rc < 0) {
dev_err(&spi->dev, "cannot enter NORMAL state\n");
goto err_free_drvdata;
goto err_unregister_lcd;
}
rc = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group);
@ -704,22 +738,15 @@ static int __devinit jbt_probe(struct spi_device *spi)
goto err_standby;
}
jbt->fb_notif.notifier_call = fb_notifier_callback;
rc = fb_register_client(&jbt->fb_notif);
if (rc < 0) {
dev_err(&spi->dev, "cannot register notifier\n");
goto err_sysfs;
}
if (pdata->probe_completed)
(pdata->probe_completed)(&spi->dev);
return 0;
err_sysfs:
sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
err_standby:
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
err_unregister_lcd:
lcd_device_unregister(jbt->lcd_dev);
err_free_drvdata:
dev_set_drvdata(&spi->dev, NULL);
kfree(jbt);
@ -732,12 +759,14 @@ static int __devexit jbt_remove(struct spi_device *spi)
struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
/* We don't want to switch off the display in case the user
* accidentially onloads the module (whose use count normally is 0) */
* accidentially unloads the module (whose use count normally is 0) */
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
fb_unregister_client(&jbt->fb_notif);
sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
dev_set_drvdata(&spi->dev, NULL);
lcd_device_unregister(jbt->lcd_dev);
kfree(jbt);
return 0;
@ -748,7 +777,10 @@ static int jbt_suspend(struct spi_device *spi, pm_message_t state)
{
struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
jbt->suspend_mode = jbt->power_mode;
jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
jbt->suspended = 1;
dev_info(&spi->dev, "suspended\n");
@ -758,12 +790,9 @@ static int jbt_suspend(struct spi_device *spi, pm_message_t state)
int jbt6k74_resume(struct spi_device *spi)
{
struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
struct jbt6k74_platform_data *pdata = spi->dev.platform_data;
jbt6k74_enter_power_mode(jbt, jbt->power_mode);
if (pdata->resuming)
(pdata->resuming)(0);
jbt->suspended = 0;
jbt6k74_enter_power_mode(jbt, jbt->suspend_mode);
dev_info(&spi->dev, "resumed\n");