From: Alexandru Ardelean <alexandru.ardelean@analog.com>
To: <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <nuno.sa@analog.com>, <jic23@kernel.org>,
Alexandru Ardelean <alexandru.ardelean@analog.com>
Subject: [PATCH v2 7/9] iio: imu: adis: add support product ID check in adis_initial_startup
Date: Mon, 10 Feb 2020 15:26:04 +0200 [thread overview]
Message-ID: <20200210132606.9315-7-alexandru.ardelean@analog.com> (raw)
In-Reply-To: <20200210132606.9315-1-alexandru.ardelean@analog.com>
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>
---
drivers/iio/imu/adis.c | 23 ++++++++++++++++++++++-
include/linux/iio/imu/adis.h | 5 +++++
2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
index 0bd6e32cf577..a8afd01de4f3 100644
--- a/drivers/iio/imu/adis.c
+++ b/drivers/iio/imu/adis.c
@@ -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);
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index b7feca4e5f26..ac7cfd073804 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -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;
--
2.20.1
next prev parent reply other threads:[~2020-02-10 13:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 13:25 [PATCH v2 1/9] iio: imu: adis16480: initialize adis_data statically Alexandru Ardelean
2020-02-10 13:25 ` [PATCH v2 2/9] iio: imu: adis16400: " Alexandru Ardelean
2020-02-14 14:29 ` Jonathan Cameron
2020-02-10 13:26 ` [PATCH v2 3/9] iio: gyro: adis16136: " Alexandru Ardelean
2020-02-14 14:30 ` Jonathan Cameron
2020-02-10 13:26 ` [PATCH v2 4/9] iio: imu: adis: add unlocked __adis_initial_startup() Alexandru Ardelean
2020-02-14 14:31 ` Jonathan Cameron
2020-02-10 13:26 ` [PATCH v2 5/9] iio: imu: adis: Add self_test_reg variable Alexandru Ardelean
2020-02-14 14:33 ` Jonathan Cameron
2020-02-10 13:26 ` [PATCH v2 6/9] iio: imu: adis: Refactor adis_initial_startup Alexandru Ardelean
2020-02-14 14:39 ` Jonathan Cameron
2020-02-10 13:26 ` Alexandru Ardelean [this message]
2020-02-14 14:41 ` [PATCH v2 7/9] iio: imu: adis: add support product ID check in adis_initial_startup Jonathan Cameron
2020-02-10 13:26 ` [PATCH v2 8/9] iio: adis16480: Make use of __adis_initial_startup Alexandru Ardelean
2020-02-14 14:44 ` Jonathan Cameron
2020-02-10 13:26 ` [PATCH v2 9/9] iio: adis16460: " Alexandru Ardelean
2020-02-14 14:45 ` Jonathan Cameron
2020-02-14 14:28 ` [PATCH v2 1/9] iio: imu: adis16480: initialize adis_data statically Jonathan Cameron
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