linux-kernel - [PATCH 3/4] iio: adis16480: Make use of __adis_initial

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Date:   Mon, 20 Jan 2020 16:20:50 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <devel@...verdev.osuosl.org>, <dragos.bogdan@...log.com>,
        <nuno.sa@...log.com>, <jic23@...nel.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH 3/4] iio: adis16480: Make use of __adis_initial_startup

From: Nuno Sá <nuno.sa@...log.com>

All actions done in `adis16480_initial_setup()` are now done in
`__adis_initial_startup()` so, there's no need for code duplication.
Furthermore, the call to `adis16480_initial_setup()` is done before any
device configuration since the device will be reset if not already (via
rst pin). This is actually fixing a potential bug since `adis_reset()` was
being called after configuring the device which is obviously a problem.

Signed-off-by: Nuno Sá <nuno.sa@...log.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/imu/adis16480.c | 55 ++++++++-----------------------------
 1 file changed, 11 insertions(+), 44 deletions(-)

diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index e1de25f18e2e..36973662a31d 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -1014,40 +1014,6 @@ static int adis16480_enable_irq(struct adis *adis, bool enable)
 	return __adis_write_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, val);
 }
 
-static int adis16480_initial_setup(struct iio_dev *indio_dev)
-{
-	struct adis16480 *st = iio_priv(indio_dev);
-	uint16_t prod_id;
-	unsigned int device_id;
-	int ret;
-
-	adis_reset(&st->adis);
-	msleep(70);
-
-	ret = adis_write_reg_16(&st->adis, ADIS16480_REG_GLOB_CMD, BIT(1));
-	if (ret)
-		return ret;
-	msleep(30);
-
-	ret = adis_check_status(&st->adis);
-	if (ret)
-		return ret;
-
-	ret = adis_read_reg_16(&st->adis, ADIS16480_REG_PROD_ID, &prod_id);
-	if (ret)
-		return ret;
-
-	ret = sscanf(indio_dev->name, "adis%u\n", &device_id);
-	if (ret != 1)
-		return -EINVAL;
-
-	if (prod_id != device_id)
-		dev_warn(&indio_dev->dev, "Device ID(%u) and product ID(%u) do not match.",
-				device_id, prod_id);
-
-	return 0;
-}
-
 #define ADIS16480_DIAG_STAT_XGYRO_FAIL 0
 #define ADIS16480_DIAG_STAT_YGYRO_FAIL 1
 #define ADIS16480_DIAG_STAT_ZGYRO_FAIL 2
@@ -1075,6 +1041,7 @@ static const char * const adis16480_status_error_msgs[] = {
 static const struct adis_data adis16480_data = {
 	.diag_stat_reg = ADIS16480_REG_DIAG_STS,
 	.glob_cmd_reg = ADIS16480_REG_GLOB_CMD,
+	.prod_id_reg = ADIS16480_REG_PROD_ID,
 	.has_paging = true,
 
 	.read_delay = 5,
@@ -1296,18 +1263,22 @@ static int adis16480_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = adis16480_config_irq_pin(spi->dev.of_node, st);
+	ret = __adis_initial_startup(&st->adis);
 	if (ret)
 		return ret;
 
+	ret = adis16480_config_irq_pin(spi->dev.of_node, st);
+	if (ret)
+		goto error_stop_device;
+
 	ret = adis16480_get_ext_clocks(st);
 	if (ret)
-		return ret;
+		goto error_stop_device;
 
 	if (!IS_ERR_OR_NULL(st->ext_clk)) {
 		ret = adis16480_ext_clk_config(st, spi->dev.of_node, true);
 		if (ret)
-			return ret;
+			goto error_stop_device;
 
 		st->clk_freq = clk_get_rate(st->ext_clk);
 		st->clk_freq *= 1000; /* micro */
@@ -1319,24 +1290,20 @@ static int adis16480_probe(struct spi_device *spi)
 	if (ret)
 		goto error_clk_disable_unprepare;
 
-	ret = adis16480_initial_setup(indio_dev);
-	if (ret)
-		goto error_cleanup_buffer;
-
 	ret = iio_device_register(indio_dev);
 	if (ret)
-		goto error_stop_device;
+		goto error_cleanup_buffer;
 
 	adis16480_debugfs_init(indio_dev);
 
 	return 0;
 
-error_stop_device:
-	adis16480_stop_device(indio_dev);
 error_cleanup_buffer:
 	adis_cleanup_buffer_and_trigger(&st->adis, indio_dev);
 error_clk_disable_unprepare:
 	clk_disable_unprepare(st->ext_clk);
+error_stop_device:
+	adis16480_stop_device(indio_dev);
 	return ret;
 }
 
-- 
2.20.1