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Input: atmel_mxt_ts - wait for CHG assert in mxt_check_bootloader 

The driver should not immediately read bootloader status when in
Application Update Mode. The CHG line will assert when the device has made
a state transition and is ready to report a new status via i2c.

This change adds a wait for completion in mxt_check_bootloader, and changes
the mxt_interrupt handler to signal the completion.

Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Acked-by: Yufeng Shen <miletus@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Benson Leung 2014-05-18 23:02:52 -07:00 committed by Dmitry Torokhov
parent 82c2c0d629
commit d79e7e47a9
1 changed files with 82 additions and 22 deletions
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94
drivers/input/touchscreen/atmel_mxt_ts.c
View File

@ -14,6 +14,8 @@
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
@ -246,16 +248,19 @@ struct mxt_data {
const struct mxt_platform_data *pdata;
struct mxt_object *object_table;
struct mxt_info info;
unsigned int irq;
unsigned int max_x;
unsigned int max_y;
bool in_bootloader;
/* Cached parameters from object table */
u8 T6_reportid;
u8 T9_reportid_min;
u8 T9_reportid_max;
u8 T19_reportid;
/* for fw update in bootloader */
struct completion bl_completion;
};
static size_t mxt_obj_size(const struct mxt_object *obj)
@ -339,12 +344,50 @@ static void mxt_dump_message(struct device *dev,
message->reportid, 7, message->message);
}
static int mxt_check_bootloader(struct i2c_client *client,
unsigned int state)
static int mxt_wait_for_chg(struct mxt_data *data, unsigned int timeout_ms)
{
struct device *dev = &data->client->dev;
struct completion *comp = &data->bl_completion;
unsigned long timeout = msecs_to_jiffies(timeout_ms);
long ret;
ret = wait_for_completion_interruptible_timeout(comp, timeout);
if (ret < 0) {
return ret;
} else if (ret == 0) {
dev_err(dev, "Wait for completion timed out.\n");
return -ETIMEDOUT;
}
return 0;
}
static int mxt_check_bootloader(struct mxt_data *data, unsigned int state)
{
struct i2c_client *client = data->client;
u8 val;
int ret;
recheck:
if (state != MXT_WAITING_BOOTLOAD_CMD) {
/*
* In application update mode, the interrupt
* line signals state transitions. We must wait for the
* CHG assertion before reading the status byte.
* Once the status byte has been read, the line is deasserted.
*/
ret = mxt_wait_for_chg(data, 300);
if (ret) {
/*
* TODO: handle -ERESTARTSYS better by terminating
* fw update process before returning to userspace
* by writing length 0x000 to device (iff we are in
* WAITING_FRAME_DATA state).
*/
dev_err(&client->dev, "Update wait error %d\n", ret);
return ret;
}
}
if (i2c_master_recv(client, &val, 1) != 1) {
dev_err(&client->dev, "%s: i2c recv failed\n", __func__);
return -EIO;
@ -590,9 +633,8 @@ static bool mxt_is_T9_message(struct mxt_data *data, struct mxt_message *msg)
return (id >= data->T9_reportid_min && id <= data->T9_reportid_max);
}
static irqreturn_t mxt_interrupt(int irq, void *dev_id)
static irqreturn_t mxt_process_messages_until_invalid(struct mxt_data *data)
{
struct mxt_data *data = dev_id;
struct mxt_message message;
const u8 *payload = &message.message[0];
struct device *dev = &data->client->dev;
@ -632,6 +674,19 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
struct mxt_data *data = dev_id;
if (data->in_bootloader) {
/* bootloader state transition completion */
complete(&data->bl_completion);
return IRQ_HANDLED;
}
return mxt_process_messages_until_invalid(data);
}
static int mxt_check_reg_init(struct mxt_data *data)
{
const struct mxt_platform_data *pdata = data->pdata;
@ -947,6 +1002,8 @@ static int mxt_load_fw(struct device *dev, const char *fn)
}
/* Change to the bootloader mode */
data->in_bootloader = true;
mxt_write_object(data, MXT_GEN_COMMAND_T6,
MXT_COMMAND_RESET, MXT_BOOT_VALUE);
msleep(MXT_RESET_TIME);
@ -957,18 +1014,19 @@ static int mxt_load_fw(struct device *dev, const char *fn)
else
client->addr = MXT_BOOT_HIGH;
ret = mxt_check_bootloader(client, MXT_WAITING_BOOTLOAD_CMD);
reinit_completion(&data->bl_completion);
ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD);
if (ret)
goto out;
goto disable_irq;
/* Unlock bootloader */
mxt_unlock_bootloader(client);
while (pos < fw->size) {
ret = mxt_check_bootloader(client,
MXT_WAITING_FRAME_DATA);
ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA);
if (ret)
goto out;
goto disable_irq;
frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
@ -980,17 +1038,19 @@ static int mxt_load_fw(struct device *dev, const char *fn)
/* Write one frame to device */
mxt_fw_write(client, fw->data + pos, frame_size);
ret = mxt_check_bootloader(client,
MXT_FRAME_CRC_PASS);
ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS);
if (ret)
goto out;
goto disable_irq;
pos += frame_size;
dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size);
}
out:
data->in_bootloader = false;
disable_irq:
disable_irq(data->irq);
release_firmware(fw);
/* Change to slave address of application */
@ -1009,8 +1069,6 @@ static ssize_t mxt_update_fw_store(struct device *dev,
struct mxt_data *data = dev_get_drvdata(dev);
int error;
disable_irq(data->irq);
error = mxt_load_fw(dev, MXT_FW_NAME);
if (error) {
dev_err(dev, "The firmware update failed(%d)\n", error);
@ -1024,13 +1082,13 @@ static ssize_t mxt_update_fw_store(struct device *dev,
mxt_free_object_table(data);
mxt_initialize(data);
}
enable_irq(data->irq);
error = mxt_make_highchg(data);
if (error)
return error;
}
return count;
}
@ -1120,6 +1178,8 @@ static int mxt_probe(struct i2c_client *client,
data->pdata = pdata;
data->irq = client->irq;
init_completion(&data->bl_completion);
mxt_calc_resolution(data);
error = mxt_initialize(data);