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iio: imu: adis: add support product ID check in adis_initial_startup

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Each driver/chip that wants to validate it's product id, can now
specify a 'prod_id_reg' and an expected 'prod_id' value.
The 'prod_id' value is intentionally left 0 (uninitialized). There aren't
(yet) any product IDs with value 0; this enforces that both 'prod_id_reg'
and 'prod_id' are specified.

At the very least, this routine validates that the SPI connection to the
ADIS chip[s] works well.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2020-02-10 15:26:04 +02:00 committed by Jonathan Cameron
parent ecb010d441
commit 1fd4567026
2 changed files with 27 additions and 1 deletions
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23
drivers/iio/imu/adis.c
View file

@ -373,6 +373,10 @@ static int adis_self_test(struct adis *adis)
* via GPIOLIB. If no pin is configured a SW reset will be performed.
* The RST pin for the ADIS devices should be configured as ACTIVE_LOW.
*
* After the self-test operation is performed, the function will also check
* that the product ID is as expected. This assumes that drivers providing
* 'prod_id_reg' will also provide the 'prod_id'.
*
* Returns 0 if the device is operational, a negative error code otherwise.
*
* This function should be called early on in the device initialization sequence
@ -382,6 +386,7 @@ int __adis_initial_startup(struct adis *adis)
{
const struct adis_timeout *timeouts = adis->data->timeouts;
struct gpio_desc *gpio;
uint16_t prod_id;
int ret;
/* check if the device has rst pin low */
@ -401,7 +406,23 @@ int __adis_initial_startup(struct adis *adis)
return ret;
}
return adis_self_test(adis);
ret = adis_self_test(adis);
if (ret)
return ret;
if (!adis->data->prod_id_reg)
return 0;
ret = adis_read_reg_16(adis, adis->data->prod_id_reg, &prod_id);
if (ret)
return ret;
if (prod_id != adis->data->prod_id)
dev_warn(&adis->spi->dev,
"Device ID(%u) and product ID(%u) do not match.",
adis->data->prod_id, prod_id);
return 0;
}
EXPORT_SYMBOL_GPL(__adis_initial_startup);

5
include/linux/iio/imu/adis.h
View file

@ -41,6 +41,8 @@ struct adis_timeout {
* @glob_cmd_reg: Register address of the GLOB_CMD register
* @msc_ctrl_reg: Register address of the MSC_CTRL register
* @diag_stat_reg: Register address of the DIAG_STAT register
* @prod_id_reg: Register address of the PROD_ID register
* @prod_id: Product ID code that should be expected when reading @prod_id_reg
* @self_test_reg: Register address to request self test command
* @status_error_msgs: Array of error messgaes
* @status_error_mask:
@ -54,6 +56,9 @@ struct adis_data {
unsigned int glob_cmd_reg;
unsigned int msc_ctrl_reg;
unsigned int diag_stat_reg;
unsigned int prod_id_reg;
unsigned int prod_id;
unsigned int self_test_mask;
unsigned int self_test_reg;