// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Mainly by David Woodhouse, somewhat modified by Jordan Crouse
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*
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* Copyright © 2006-2007 Red Hat, Inc.
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* Copyright © 2006-2007 Advanced Micro Devices, Inc.
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* Copyright © 2009 VIA Technology, Inc.
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* Copyright (c) 2010-2011 Andres Salomon <dilinger@queued.net>
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*/
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|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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|
#include <linux/kernel.h>
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#include <linux/fb.h>
|
#include <linux/console.h>
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#include <linux/i2c.h>
|
#include <linux/platform_device.h>
|
#include <linux/interrupt.h>
|
#include <linux/delay.h>
|
#include <linux/module.h>
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#include <linux/backlight.h>
|
#include <linux/device.h>
|
#include <linux/uaccess.h>
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#include <linux/ctype.h>
|
#include <linux/reboot.h>
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#include <linux/olpc-ec.h>
|
#include <asm/tsc.h>
|
#include <asm/olpc.h>
|
|
#include "olpc_dcon.h"
|
|
/* Module definitions */
|
|
static ushort resumeline = 898;
|
module_param(resumeline, ushort, 0444);
|
|
static struct dcon_platform_data *pdata;
|
|
/* I2C structures */
|
|
/* Platform devices */
|
static struct platform_device *dcon_device;
|
|
static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
|
|
static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val)
|
{
|
return i2c_smbus_write_word_data(dcon->client, reg, val);
|
}
|
|
static s32 dcon_read(struct dcon_priv *dcon, u8 reg)
|
{
|
return i2c_smbus_read_word_data(dcon->client, reg);
|
}
|
|
/* ===== API functions - these are called by a variety of users ==== */
|
|
static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
|
{
|
u16 ver;
|
int rc = 0;
|
|
ver = dcon_read(dcon, DCON_REG_ID);
|
if ((ver >> 8) != 0xDC) {
|
pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver);
|
rc = -ENXIO;
|
goto err;
|
}
|
|
if (is_init) {
|
pr_info("Discovered DCON version %x\n", ver & 0xFF);
|
rc = pdata->init(dcon);
|
if (rc != 0) {
|
pr_err("Unable to init.\n");
|
goto err;
|
}
|
}
|
|
if (ver < 0xdc02) {
|
dev_err(&dcon->client->dev,
|
"DCON v1 is unsupported, giving up..\n");
|
rc = -ENODEV;
|
goto err;
|
}
|
|
/* SDRAM setup/hold time */
|
dcon_write(dcon, 0x3a, 0xc040);
|
dcon_write(dcon, DCON_REG_MEM_OPT_A, 0x0000); /* clear option bits */
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dcon_write(dcon, DCON_REG_MEM_OPT_A,
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MEM_DLL_CLOCK_DELAY | MEM_POWER_DOWN);
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dcon_write(dcon, DCON_REG_MEM_OPT_B, MEM_SOFT_RESET);
|
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/* Colour swizzle, AA, no passthrough, backlight */
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if (is_init) {
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dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE |
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MODE_CSWIZZLE | MODE_COL_AA;
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}
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dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
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/* Set the scanline to interrupt on during resume */
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dcon_write(dcon, DCON_REG_SCAN_INT, resumeline);
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|
err:
|
return rc;
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}
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/*
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* The smbus doesn't always come back due to what is believed to be
|
* hardware (power rail) bugs. For older models where this is known to
|
* occur, our solution is to attempt to wait for the bus to stabilize;
|
* if it doesn't happen, cut power to the dcon, repower it, and wait
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* for the bus to stabilize. Rinse, repeat until we have a working
|
* smbus. For newer models, we simply BUG(); we want to know if this
|
* still happens despite the power fixes that have been made!
|
*/
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static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down)
|
{
|
unsigned long timeout;
|
u8 pm;
|
int x;
|
|
power_up:
|
if (is_powered_down) {
|
pm = 1;
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x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
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if (x) {
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pr_warn("unable to force dcon to power up: %d!\n", x);
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return x;
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}
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usleep_range(10000, 11000); /* we'll be conservative */
|
}
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pdata->bus_stabilize_wiggle();
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for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
|
usleep_range(1000, 1100);
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x = dcon_read(dcon, DCON_REG_ID);
|
}
|
if (x < 0) {
|
pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n");
|
BUG_ON(olpc_board_at_least(olpc_board(0xc2)));
|
pm = 0;
|
olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
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msleep(100);
|
is_powered_down = 1;
|
goto power_up; /* argh, stupid hardware.. */
|
}
|
|
if (is_powered_down)
|
return dcon_hw_init(dcon, 0);
|
return 0;
|
}
|
|
static void dcon_set_backlight(struct dcon_priv *dcon, u8 level)
|
{
|
dcon->bl_val = level;
|
dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val);
|
|
/* Purposely turn off the backlight when we go to level 0 */
|
if (dcon->bl_val == 0) {
|
dcon->disp_mode &= ~MODE_BL_ENABLE;
|
dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
|
} else if (!(dcon->disp_mode & MODE_BL_ENABLE)) {
|
dcon->disp_mode |= MODE_BL_ENABLE;
|
dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
|
}
|
}
|
|
/* Set the output type to either color or mono */
|
static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono)
|
{
|
if (dcon->mono == enable_mono)
|
return 0;
|
|
dcon->mono = enable_mono;
|
|
if (enable_mono) {
|
dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA);
|
dcon->disp_mode |= MODE_MONO_LUMA;
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} else {
|
dcon->disp_mode &= ~(MODE_MONO_LUMA);
|
dcon->disp_mode |= MODE_CSWIZZLE | MODE_COL_AA;
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}
|
|
dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
|
return 0;
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}
|
|
/* For now, this will be really stupid - we need to address how
|
* DCONLOAD works in a sleep and account for it accordingly
|
*/
|
|
static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
|
{
|
int x;
|
|
/* Turn off the backlight and put the DCON to sleep */
|
|
if (dcon->asleep == sleep)
|
return;
|
|
if (!olpc_board_at_least(olpc_board(0xc2)))
|
return;
|
|
if (sleep) {
|
u8 pm = 0;
|
|
x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
|
if (x)
|
pr_warn("unable to force dcon to power down: %d!\n", x);
|
else
|
dcon->asleep = sleep;
|
} else {
|
/* Only re-enable the backlight if the backlight value is set */
|
if (dcon->bl_val != 0)
|
dcon->disp_mode |= MODE_BL_ENABLE;
|
x = dcon_bus_stabilize(dcon, 1);
|
if (x)
|
pr_warn("unable to reinit dcon hardware: %d!\n", x);
|
else
|
dcon->asleep = sleep;
|
|
/* Restore backlight */
|
dcon_set_backlight(dcon, dcon->bl_val);
|
}
|
|
/* We should turn off some stuff in the framebuffer - but what? */
|
}
|
|
/* the DCON seems to get confused if we change DCONLOAD too
|
* frequently -- i.e., approximately faster than frame time.
|
* normally we don't change it this fast, so in general we won't
|
* delay here.
|
*/
|
static void dcon_load_holdoff(struct dcon_priv *dcon)
|
{
|
ktime_t delta_t, now;
|
|
while (1) {
|
now = ktime_get();
|
delta_t = ktime_sub(now, dcon->load_time);
|
if (ktime_to_ns(delta_t) > NSEC_PER_MSEC * 20)
|
break;
|
mdelay(4);
|
}
|
}
|
|
static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank)
|
{
|
int err;
|
|
console_lock();
|
lock_fb_info(dcon->fbinfo);
|
|
dcon->ignore_fb_events = true;
|
err = fb_blank(dcon->fbinfo,
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blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
|
dcon->ignore_fb_events = false;
|
unlock_fb_info(dcon->fbinfo);
|
console_unlock();
|
|
if (err) {
|
dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n",
|
blank ? "" : "un");
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return false;
|
}
|
return true;
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}
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/* Set the source of the display (CPU or DCON) */
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static void dcon_source_switch(struct work_struct *work)
|
{
|
struct dcon_priv *dcon = container_of(work, struct dcon_priv,
|
switch_source);
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int source = dcon->pending_src;
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|
if (dcon->curr_src == source)
|
return;
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dcon_load_holdoff(dcon);
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|
dcon->switched = false;
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|
switch (source) {
|
case DCON_SOURCE_CPU:
|
pr_info("%s to CPU\n", __func__);
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/* Enable the scanline interrupt bit */
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if (dcon_write(dcon, DCON_REG_MODE,
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dcon->disp_mode | MODE_SCAN_INT))
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pr_err("couldn't enable scanline interrupt!\n");
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else
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/* Wait up to one second for the scanline interrupt */
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wait_event_timeout(dcon->waitq, dcon->switched, HZ);
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|
if (!dcon->switched)
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pr_err("Timeout entering CPU mode; expect a screen glitch.\n");
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|
/* Turn off the scanline interrupt */
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if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode))
|
pr_err("couldn't disable scanline interrupt!\n");
|
|
/*
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* Ideally we'd like to disable interrupts here so that the
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* fb unblanking and DCON turn on happen at a known time value;
|
* however, we can't do that right now with fb_blank
|
* messing with semaphores.
|
*
|
* For now, we just hope..
|
*/
|
if (!dcon_blank_fb(dcon, false)) {
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pr_err("Failed to enter CPU mode\n");
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dcon->pending_src = DCON_SOURCE_DCON;
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return;
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}
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/* And turn off the DCON */
|
pdata->set_dconload(1);
|
dcon->load_time = ktime_get();
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|
pr_info("The CPU has control\n");
|
break;
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case DCON_SOURCE_DCON:
|
{
|
ktime_t delta_t;
|
|
pr_info("%s to DCON\n", __func__);
|
|
/* Clear DCONLOAD - this implies that the DCON is in control */
|
pdata->set_dconload(0);
|
dcon->load_time = ktime_get();
|
|
wait_event_timeout(dcon->waitq, dcon->switched, HZ / 2);
|
|
if (!dcon->switched) {
|
pr_err("Timeout entering DCON mode; expect a screen glitch.\n");
|
} else {
|
/* sometimes the DCON doesn't follow its own rules,
|
* and doesn't wait for two vsync pulses before
|
* ack'ing the frame load with an IRQ. the result
|
* is that the display shows the *previously*
|
* loaded frame. we can detect this by looking at
|
* the time between asserting DCONLOAD and the IRQ --
|
* if it's less than 20msec, then the DCON couldn't
|
* have seen two VSYNC pulses. in that case we
|
* deassert and reassert, and hope for the best.
|
* see http://dev.laptop.org/ticket/9664
|
*/
|
delta_t = ktime_sub(dcon->irq_time, dcon->load_time);
|
if (dcon->switched && ktime_to_ns(delta_t)
|
< NSEC_PER_MSEC * 20) {
|
pr_err("missed loading, retrying\n");
|
pdata->set_dconload(1);
|
mdelay(41);
|
pdata->set_dconload(0);
|
dcon->load_time = ktime_get();
|
mdelay(41);
|
}
|
}
|
|
dcon_blank_fb(dcon, true);
|
pr_info("The DCON has control\n");
|
break;
|
}
|
default:
|
BUG();
|
}
|
|
dcon->curr_src = source;
|
}
|
|
static void dcon_set_source(struct dcon_priv *dcon, int arg)
|
{
|
if (dcon->pending_src == arg)
|
return;
|
|
dcon->pending_src = arg;
|
|
if (dcon->curr_src != arg)
|
schedule_work(&dcon->switch_source);
|
}
|
|
static void dcon_set_source_sync(struct dcon_priv *dcon, int arg)
|
{
|
dcon_set_source(dcon, arg);
|
flush_scheduled_work();
|
}
|
|
static ssize_t dcon_mode_show(struct device *dev,
|
struct device_attribute *attr,
|
char *buf)
|
{
|
struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
return sprintf(buf, "%4.4X\n", dcon->disp_mode);
|
}
|
|
static ssize_t dcon_sleep_show(struct device *dev,
|
struct device_attribute *attr,
|
char *buf)
|
{
|
struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
return sprintf(buf, "%d\n", dcon->asleep);
|
}
|
|
static ssize_t dcon_freeze_show(struct device *dev,
|
struct device_attribute *attr,
|
char *buf)
|
{
|
struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0);
|
}
|
|
static ssize_t dcon_mono_show(struct device *dev,
|
struct device_attribute *attr,
|
char *buf)
|
{
|
struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
return sprintf(buf, "%d\n", dcon->mono);
|
}
|
|
static ssize_t dcon_resumeline_show(struct device *dev,
|
struct device_attribute *attr,
|
char *buf)
|
{
|
return sprintf(buf, "%d\n", resumeline);
|
}
|
|
static ssize_t dcon_mono_store(struct device *dev,
|
struct device_attribute *attr,
|
const char *buf, size_t count)
|
{
|
unsigned long enable_mono;
|
int rc;
|
|
rc = kstrtoul(buf, 10, &enable_mono);
|
if (rc)
|
return rc;
|
|
dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false);
|
|
return count;
|
}
|
|
static ssize_t dcon_freeze_store(struct device *dev,
|
struct device_attribute *attr,
|
const char *buf, size_t count)
|
{
|
struct dcon_priv *dcon = dev_get_drvdata(dev);
|
unsigned long output;
|
int ret;
|
|
ret = kstrtoul(buf, 10, &output);
|
if (ret)
|
return ret;
|
|
switch (output) {
|
case 0:
|
dcon_set_source(dcon, DCON_SOURCE_CPU);
|
break;
|
case 1:
|
dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
|
break;
|
case 2: /* normally unused */
|
dcon_set_source(dcon, DCON_SOURCE_DCON);
|
break;
|
default:
|
return -EINVAL;
|
}
|
|
return count;
|
}
|
|
static ssize_t dcon_resumeline_store(struct device *dev,
|
struct device_attribute *attr,
|
const char *buf, size_t count)
|
{
|
unsigned short rl;
|
int rc;
|
|
rc = kstrtou16(buf, 10, &rl);
|
if (rc)
|
return rc;
|
|
resumeline = rl;
|
dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline);
|
|
return count;
|
}
|
|
static ssize_t dcon_sleep_store(struct device *dev,
|
struct device_attribute *attr,
|
const char *buf, size_t count)
|
{
|
unsigned long output;
|
int ret;
|
|
ret = kstrtoul(buf, 10, &output);
|
if (ret)
|
return ret;
|
|
dcon_sleep(dev_get_drvdata(dev), output ? true : false);
|
return count;
|
}
|
|
static struct device_attribute dcon_device_files[] = {
|
__ATTR(mode, 0444, dcon_mode_show, NULL),
|
__ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store),
|
__ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store),
|
__ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store),
|
__ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
|
};
|
|
static int dcon_bl_update(struct backlight_device *dev)
|
{
|
struct dcon_priv *dcon = bl_get_data(dev);
|
u8 level = dev->props.brightness & 0x0F;
|
|
if (dev->props.power != FB_BLANK_UNBLANK)
|
level = 0;
|
|
if (level != dcon->bl_val)
|
dcon_set_backlight(dcon, level);
|
|
/* power down the DCON when the screen is blanked */
|
if (!dcon->ignore_fb_events)
|
dcon_sleep(dcon, !!(dev->props.state & BL_CORE_FBBLANK));
|
|
return 0;
|
}
|
|
static int dcon_bl_get(struct backlight_device *dev)
|
{
|
struct dcon_priv *dcon = bl_get_data(dev);
|
|
return dcon->bl_val;
|
}
|
|
static const struct backlight_ops dcon_bl_ops = {
|
.update_status = dcon_bl_update,
|
.get_brightness = dcon_bl_get,
|
};
|
|
static struct backlight_properties dcon_bl_props = {
|
.max_brightness = 15,
|
.type = BACKLIGHT_RAW,
|
.power = FB_BLANK_UNBLANK,
|
};
|
|
static int dcon_reboot_notify(struct notifier_block *nb,
|
unsigned long foo, void *bar)
|
{
|
struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb);
|
|
if (!dcon || !dcon->client)
|
return NOTIFY_DONE;
|
|
/* Turn off the DCON. Entirely. */
|
dcon_write(dcon, DCON_REG_MODE, 0x39);
|
dcon_write(dcon, DCON_REG_MODE, 0x32);
|
return NOTIFY_DONE;
|
}
|
|
static int unfreeze_on_panic(struct notifier_block *nb,
|
unsigned long e, void *p)
|
{
|
pdata->set_dconload(1);
|
return NOTIFY_DONE;
|
}
|
|
static struct notifier_block dcon_panic_nb = {
|
.notifier_call = unfreeze_on_panic,
|
};
|
|
static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info)
|
{
|
strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE);
|
|
return 0;
|
}
|
|
static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
{
|
struct dcon_priv *dcon;
|
int rc, i, j;
|
|
if (!pdata)
|
return -ENXIO;
|
|
dcon = kzalloc(sizeof(*dcon), GFP_KERNEL);
|
if (!dcon)
|
return -ENOMEM;
|
|
dcon->client = client;
|
init_waitqueue_head(&dcon->waitq);
|
INIT_WORK(&dcon->switch_source, dcon_source_switch);
|
dcon->reboot_nb.notifier_call = dcon_reboot_notify;
|
dcon->reboot_nb.priority = -1;
|
|
i2c_set_clientdata(client, dcon);
|
|
if (num_registered_fb < 1) {
|
dev_err(&client->dev, "DCON driver requires a registered fb\n");
|
rc = -EIO;
|
goto einit;
|
}
|
dcon->fbinfo = registered_fb[0];
|
|
rc = dcon_hw_init(dcon, 1);
|
if (rc)
|
goto einit;
|
|
/* Add the DCON device */
|
|
dcon_device = platform_device_alloc("dcon", -1);
|
|
if (!dcon_device) {
|
pr_err("Unable to create the DCON device\n");
|
rc = -ENOMEM;
|
goto eirq;
|
}
|
rc = platform_device_add(dcon_device);
|
platform_set_drvdata(dcon_device, dcon);
|
|
if (rc) {
|
pr_err("Unable to add the DCON device\n");
|
goto edev;
|
}
|
|
for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) {
|
rc = device_create_file(&dcon_device->dev,
|
&dcon_device_files[i]);
|
if (rc) {
|
dev_err(&dcon_device->dev, "Cannot create sysfs file\n");
|
goto ecreate;
|
}
|
}
|
|
dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
|
|
/* Add the backlight device for the DCON */
|
dcon_bl_props.brightness = dcon->bl_val;
|
dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
|
dcon, &dcon_bl_ops,
|
&dcon_bl_props);
|
if (IS_ERR(dcon->bl_dev)) {
|
dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
|
PTR_ERR(dcon->bl_dev));
|
dcon->bl_dev = NULL;
|
}
|
|
register_reboot_notifier(&dcon->reboot_nb);
|
atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
|
|
return 0;
|
|
ecreate:
|
for (j = 0; j < i; j++)
|
device_remove_file(&dcon_device->dev, &dcon_device_files[j]);
|
edev:
|
platform_device_unregister(dcon_device);
|
dcon_device = NULL;
|
eirq:
|
free_irq(DCON_IRQ, dcon);
|
einit:
|
kfree(dcon);
|
return rc;
|
}
|
|
static int dcon_remove(struct i2c_client *client)
|
{
|
struct dcon_priv *dcon = i2c_get_clientdata(client);
|
|
unregister_reboot_notifier(&dcon->reboot_nb);
|
atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);
|
|
free_irq(DCON_IRQ, dcon);
|
|
backlight_device_unregister(dcon->bl_dev);
|
|
if (dcon_device)
|
platform_device_unregister(dcon_device);
|
cancel_work_sync(&dcon->switch_source);
|
|
kfree(dcon);
|
|
return 0;
|
}
|
|
#ifdef CONFIG_PM
|
static int dcon_suspend(struct device *dev)
|
{
|
struct i2c_client *client = to_i2c_client(dev);
|
struct dcon_priv *dcon = i2c_get_clientdata(client);
|
|
if (!dcon->asleep) {
|
/* Set up the DCON to have the source */
|
dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
|
}
|
|
return 0;
|
}
|
|
static int dcon_resume(struct device *dev)
|
{
|
struct i2c_client *client = to_i2c_client(dev);
|
struct dcon_priv *dcon = i2c_get_clientdata(client);
|
|
if (!dcon->asleep) {
|
dcon_bus_stabilize(dcon, 0);
|
dcon_set_source(dcon, DCON_SOURCE_CPU);
|
}
|
|
return 0;
|
}
|
|
#else
|
|
#define dcon_suspend NULL
|
#define dcon_resume NULL
|
|
#endif /* CONFIG_PM */
|
|
irqreturn_t dcon_interrupt(int irq, void *id)
|
{
|
struct dcon_priv *dcon = id;
|
u8 status;
|
|
if (pdata->read_status(&status))
|
return IRQ_NONE;
|
|
switch (status & 3) {
|
case 3:
|
pr_debug("DCONLOAD_MISSED interrupt\n");
|
break;
|
|
case 2: /* switch to DCON mode */
|
case 1: /* switch to CPU mode */
|
dcon->switched = true;
|
dcon->irq_time = ktime_get();
|
wake_up(&dcon->waitq);
|
break;
|
|
case 0:
|
/* workaround resume case: the DCON (on 1.5) doesn't
|
* ever assert status 0x01 when switching to CPU mode
|
* during resume. this is because DCONLOAD is de-asserted
|
* _immediately_ upon exiting S3, so the actual release
|
* of the DCON happened long before this point.
|
* see http://dev.laptop.org/ticket/9869
|
*/
|
if (dcon->curr_src != dcon->pending_src && !dcon->switched) {
|
dcon->switched = true;
|
dcon->irq_time = ktime_get();
|
wake_up(&dcon->waitq);
|
pr_debug("switching w/ status 0/0\n");
|
} else {
|
pr_debug("scanline interrupt w/CPU\n");
|
}
|
}
|
|
return IRQ_HANDLED;
|
}
|
|
static const struct dev_pm_ops dcon_pm_ops = {
|
.suspend = dcon_suspend,
|
.resume = dcon_resume,
|
};
|
|
static const struct i2c_device_id dcon_idtable[] = {
|
{ "olpc_dcon", 0 },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(i2c, dcon_idtable);
|
|
static struct i2c_driver dcon_driver = {
|
.driver = {
|
.name = "olpc_dcon",
|
.pm = &dcon_pm_ops,
|
},
|
.class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
|
.id_table = dcon_idtable,
|
.probe = dcon_probe,
|
.remove = dcon_remove,
|
.detect = dcon_detect,
|
.address_list = normal_i2c,
|
};
|
|
static int __init olpc_dcon_init(void)
|
{
|
/* XO-1.5 */
|
if (olpc_board_at_least(olpc_board(0xd0)))
|
pdata = &dcon_pdata_xo_1_5;
|
else
|
pdata = &dcon_pdata_xo_1;
|
|
return i2c_add_driver(&dcon_driver);
|
}
|
|
static void __exit olpc_dcon_exit(void)
|
{
|
i2c_del_driver(&dcon_driver);
|
}
|
|
module_init(olpc_dcon_init);
|
module_exit(olpc_dcon_exit);
|
|
MODULE_LICENSE("GPL");
|
