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usb_update: Add support for touchpad debugging feature

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We support touchpad-specific debugging feature over the USB update
protocol. This will be used to fetch raw data from the sensor,
without requiring to remove the write-protect screw.

BRANCH=none
BUG=b:63993891
TEST=./usb_updater2 -g 00 -d 18d1:502b

Change-Id: I46dfd97aaa17b73a5893fe1e8c62327a302f829b
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/763574
Reviewed-by: Chun-ta Lin <itspeter@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Nicolas Boichat
2017-11-09 16:35:53 -08:00
committed by chrome-bot
parent b3c9986802
commit 7fdcb8bf86
3 changed files with 50 additions and 0 deletions
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25
common/usb_update.c
View File

@@ -326,6 +326,31 @@ static int try_vendor_command(struct consumer const *consumer, size_t count)
&tp, response_size);
return 1;
}
case UPDATE_EXTRA_CMD_TOUCHPAD_DEBUG: {
uint8_t *data = NULL;
unsigned int write_count = 0;
/*
* Let the touchpad driver decide what it wants to do
* with the payload data, and put the response in data.
*/
response = touchpad_debug(buffer + header_size,
data_count, &data, &write_count);
/*
* On error, or if there is no data to write back, just
* write back response.
*/
if (response != EC_RES_SUCCESS || write_count == 0)
break;
/* Check that we can write all the data to the queue. */
if (write_count > queue_space(&update_to_usb))
return EC_RES_BUSY;
QUEUE_ADD_UNITS(&update_to_usb, data, write_count);
return 1;
}
#endif
default:
response = EC_RES_INVALID_COMMAND;

7
driver/touchpad_elan.c
View File

@@ -505,6 +505,13 @@ int touchpad_update_write(int offset, int size, const uint8_t *data)
}
return EC_SUCCESS;
}
/* TODO(b:63993891): Implement debugging mode for Elan touchpad. */
int touchpad_debug(const uint8_t *param, unsigned int param_size,
uint8_t **data, unsigned int *data_size)
{
return EC_RES_INVALID_COMMAND;
}
#endif
void elan_tp_interrupt(enum gpio_signal signal)

18
include/update_fw.h
View File

@@ -165,6 +165,7 @@ enum update_extra_command {
UPDATE_EXTRA_CMD_INJECT_ENTROPY = 5,
UPDATE_EXTRA_CMD_PAIR_CHALLENGE = 6,
UPDATE_EXTRA_CMD_TOUCHPAD_INFO = 7,
UPDATE_EXTRA_CMD_TOUCHPAD_DEBUG = 8,
};
/*
@@ -247,6 +248,23 @@ int touchpad_get_info(struct touchpad_info *tp);
/* Touchpad FW update: Write a FW block. */
int touchpad_update_write(int offset, int size, const uint8_t *data);
/**
* Touchpad debugging interface, called whenever UPDATE_EXTRA_CMD_TOUCHPAD_DEBUG
* is received. Behaviour is touchpad-vendor dependent, with the following
* restrictions: data must be allocated statically, and must not be larger than
* 64 bytes.
*
* @param param Data passed as parameter to command.
* @param param_size Number of bytes passed as parameter.
* @param data Data to write back to host, needs to be allocated
* statically by touchpad handler.
* @param data_size Amount of data to write back to host (up to 64 bytes).
*
* @return EC_RES_SUCCESS on success, any other EC_RES_* status on error.
*/
int touchpad_debug(const uint8_t *param, unsigned int param_size,
uint8_t **data, unsigned int *data_size);
/* SHA256 hash of the touchpad firmware expected by this image. */
extern const uint8_t touchpad_fw_full_hash[32];