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Subject[PATCH v1 26/63] Input: atmel_mxt_ts - make bootloader interrupt driven
Date
From: Nick Dyer <nick.dyer@itdev.co.uk>

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
(cherry picked from ndyer/linux/for-upstream commit 67a3eea0cfc724c3c2a7410ac064f74227c7c6ef)
[gdavis: Resolve forward port conflicts due to applying upstream
commit 96a938aa214e ("Input: atmel_mxt_ts - remove platform
data support").]
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 120 ++++++++++++-----------
1 file changed, 61 insertions(+), 59 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 6f185bc5128c..2bc80abcbd80 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -27,6 +27,7 @@
#include <linux/gpio/consumer.h>
#include <asm/unaligned.h>
#include <linux/regulator/consumer.h>
+#include <linux/workqueue.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
@@ -218,6 +219,7 @@ enum t100_type {
#define MXT_REGULATOR_DELAY 150 /* msec */
#define MXT_CHG_DELAY 100 /* msec */
#define MXT_POWERON_DELAY 150 /* msec */
+#define MXT_BOOTLOADER_WAIT 36E5 /* 1 minute */

/* Command to unlock bootloader */
#define MXT_UNLOCK_CMD_MSB 0xaa
@@ -299,6 +301,7 @@ struct mxt_fw_frame {

/* Firmware update context */
struct mxt_flash {
+ struct mxt_data *data;
const struct firmware *fw;
struct mxt_fw_frame *frame;
loff_t pos;
@@ -306,7 +309,8 @@ struct mxt_flash {
unsigned int count;
unsigned int retry;
u8 previous;
- bool complete;
+ struct completion flash_completion;
+ struct delayed_work work;
};

/* Each client has this additional data */
@@ -355,6 +359,7 @@ struct mxt_data {
char *cfg_name;
const char *pcfg_name;
const char *input_name;
+ struct mxt_flash *flash;

/* Cached parameters from object table */
u16 T5_address;
@@ -599,28 +604,17 @@ static int mxt_write_firmware_frame(struct mxt_data *data, struct mxt_flash *f)
f->frame_size);
}

-static int mxt_check_bootloader(struct mxt_data *data, struct mxt_flash *f)
+static int mxt_check_bootloader(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
+ struct mxt_flash *f = data->flash;
u8 state;
int ret;

- /*
- * 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_completion(data, &data->chg_completion,
- MXT_FW_CHG_TIMEOUT);
- 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_warn(dev, "Update wait error %d\n", ret);
+ /* Handle interrupt after download/flash process */
+ if (f->pos >= f->fw->size) {
+ complete(&f->flash_completion);
+ return 0;
}

ret = mxt_bootloader_read(data, &state, 1);
@@ -666,14 +660,12 @@ static int mxt_check_bootloader(struct mxt_data *data, struct mxt_flash *f)
f->pos += f->frame_size;
f->count++;

- if (f->pos >= f->fw->size) {
- f->complete = true;
+ if (f->pos >= f->fw->size)
dev_info(dev, "Sent %u frames, %zu bytes\n",
f->count, f->fw->size);
- } else if (f->count % 50 == 0) {
+ else if (f->count % 50 == 0)
dev_dbg(dev, "Sent %u frames, %lld/%zu bytes\n",
f->count, f->pos, f->fw->size);
- }

break;

@@ -695,6 +687,9 @@ static int mxt_check_bootloader(struct mxt_data *data, struct mxt_flash *f)

f->previous = state;

+ /* Poll after 0.1s if no interrupt received */
+ schedule_delayed_work(&f->work, HZ / 10);
+
return 0;

unexpected:
@@ -1402,8 +1397,12 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)

complete(&data->chg_completion);

- if (data->in_bootloader)
- return IRQ_HANDLED;
+ if (data->in_bootloader) {
+ if (data->flash && &data->flash->work)
+ cancel_delayed_work_sync(&data->flash->work);
+
+ return IRQ_RETVAL(mxt_check_bootloader(data));
+ }

if (!data->object_table)
return IRQ_HANDLED;
@@ -3300,16 +3299,13 @@ static int mxt_enter_bootloader(struct mxt_data *data)
if (data->suspend_mode == MXT_SUSPEND_REGULATOR)
mxt_regulator_enable(data);

- if (data->suspend_mode == MXT_SUSPEND_DEEP_SLEEP)
- enable_irq(data->irq);
-
data->suspended = false;
}

if (!data->in_bootloader) {
- /* Change to the bootloader mode */
- data->in_bootloader = true;
+ disable_irq(data->irq);

+ /* Change to the bootloader mode */
ret = mxt_t6_command(data, MXT_COMMAND_RESET,
MXT_BOOT_VALUE, false);
if (ret)
@@ -3322,67 +3318,73 @@ static int mxt_enter_bootloader(struct mxt_data *data)
if (ret)
return ret;

+ data->in_bootloader = true;
mxt_sysfs_remove(data);
mxt_free_input_device(data);
mxt_free_object_table(data);
- } else {
- enable_irq(data->irq);
}

- reinit_completion(&data->chg_completion);
+ dev_dbg(&data->client->dev, "Entered bootloader\n");

return 0;
}

+static void mxt_fw_work(struct work_struct *work)
+{
+ struct mxt_flash *f =
+ container_of(work, struct mxt_flash, work.work);
+
+ mxt_check_bootloader(f->data);
+}
+
static int mxt_load_fw(struct device *dev)
{
struct mxt_data *data = dev_get_drvdata(dev);
- struct mxt_flash f = { 0, };
int ret;

- ret = request_firmware(&f.fw, data->fw_name, dev);
+ data->flash = devm_kzalloc(dev, sizeof(struct mxt_flash), GFP_KERNEL);
+ if (!data->flash)
+ return -ENOMEM;
+
+ data->flash->data = data;
+
+ ret = request_firmware(&data->flash->fw, data->fw_name, dev);
if (ret) {
dev_err(dev, "Unable to open firmware %s\n", data->fw_name);
- return ret;
+ goto free;
}

/* Check for incorrect enc file */
- ret = mxt_check_firmware_format(dev, f.fw);
+ ret = mxt_check_firmware_format(dev, data->flash->fw);
if (ret)
goto release_firmware;

- ret = mxt_enter_bootloader(data);
- if (ret)
- goto release_firmware;
+ init_completion(&data->flash->flash_completion);
+ INIT_DELAYED_WORK(&data->flash->work, mxt_fw_work);
+ reinit_completion(&data->flash->flash_completion);

- while (true) {
- ret = mxt_check_bootloader(data, &f);
+ if (!data->in_bootloader) {
+ ret = mxt_enter_bootloader(data);
if (ret)
- return ret;
-
- if (f.complete)
- break;
+ goto release_firmware;
}

- /* Wait for flash. */
- ret = mxt_wait_for_completion(data, &data->chg_completion,
- MXT_FW_RESET_TIME);
- if (ret)
- goto disable_irq;
+ enable_irq(data->irq);

+ /* Poll after 0.1s if no interrupt received */
+ schedule_delayed_work(&data->flash->work, HZ / 10);

- /*
- * Wait for device to reset. Some bootloader versions do not assert
- * the CHG line after bootloading has finished, so ignore potential
- * errors.
- */
- mxt_wait_for_completion(data, &data->chg_completion, MXT_FW_RESET_TIME);
+ /* Wait for flash. */
+ ret = mxt_wait_for_completion(data, &data->flash->flash_completion,
+ MXT_BOOTLOADER_WAIT);

- data->in_bootloader = false;
-disable_irq:
disable_irq(data->irq);
+ cancel_delayed_work_sync(&data->flash->work);
+ data->in_bootloader = false;
release_firmware:
- release_firmware(f.fw);
+ release_firmware(data->flash->fw);
+free:
+ devm_kfree(dev, data->flash);
return ret;
}

--
2.19.2
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