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authorAndreas Klinger <ak@it-klinger.de>2019-04-09 21:10:22 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2019-04-14 14:05:31 +0100
commitbb208037ae45eb891765f0cff4198e9f58da7bd8 (patch)
treee6c475702d9bd627f42e3ef5805f846d73598d31 /drivers/iio
parent1c2fb40546489ce4ad3cf0cb46d70b5bdea05205 (diff)
downloadlinux-bb208037ae45eb891765f0cff4198e9f58da7bd8.tar.gz
srf04.c: add maxbotix ultrasonic sensors
add Maxbotix LV ultrasonic sensor types mb1000, mb1010, mb1020, mb1030 and mb1040 add a configuration struct with the different trigger pulse lengths Signed-off-by: Andreas Klinger <ak@it-klinger.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/proximity/srf04.c38
1 files changed, 29 insertions, 9 deletions
diff --git a/drivers/iio/proximity/srf04.c b/drivers/iio/proximity/srf04.c
index 09c7b9c095b0..1bad4018d1aa 100644
--- a/drivers/iio/proximity/srf04.c
+++ b/drivers/iio/proximity/srf04.c
@@ -23,7 +23,7 @@
* trig: --+ +------------------------------------------------------
* ^ ^
* |<->|
- * udelay(10)
+ * udelay(trigger_pulse_us)
*
* ultra +-+ +-+ +-+
* sonic | | | | | |
@@ -48,6 +48,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/sched.h>
@@ -56,6 +57,10 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
+struct srf04_cfg {
+ unsigned long trigger_pulse_us;
+};
+
struct srf04_data {
struct device *dev;
struct gpio_desc *gpiod_trig;
@@ -66,6 +71,15 @@ struct srf04_data {
ktime_t ts_falling;
struct completion rising;
struct completion falling;
+ const struct srf04_cfg *cfg;
+};
+
+static const struct srf04_cfg srf04_cfg = {
+ .trigger_pulse_us = 10,
+};
+
+static const struct srf04_cfg mb_lv_cfg = {
+ .trigger_pulse_us = 20,
};
static irqreturn_t srf04_handle_irq(int irq, void *dev_id)
@@ -102,7 +116,7 @@ static int srf04_read(struct srf04_data *data)
reinit_completion(&data->falling);
gpiod_set_value(data->gpiod_trig, 1);
- udelay(10);
+ udelay(data->cfg->trigger_pulse_us);
gpiod_set_value(data->gpiod_trig, 0);
/* it cannot take more than 20 ms */
@@ -215,6 +229,18 @@ static const struct iio_chan_spec srf04_chan_spec[] = {
},
};
+static const struct of_device_id of_srf04_match[] = {
+ { .compatible = "devantech,srf04", .data = &srf04_cfg},
+ { .compatible = "maxbotix,mb1000", .data = &mb_lv_cfg},
+ { .compatible = "maxbotix,mb1010", .data = &mb_lv_cfg},
+ { .compatible = "maxbotix,mb1020", .data = &mb_lv_cfg},
+ { .compatible = "maxbotix,mb1030", .data = &mb_lv_cfg},
+ { .compatible = "maxbotix,mb1040", .data = &mb_lv_cfg},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, of_srf04_match);
+
static int srf04_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -230,6 +256,7 @@ static int srf04_probe(struct platform_device *pdev)
data = iio_priv(indio_dev);
data->dev = dev;
+ data->cfg = of_match_device(of_srf04_match, dev)->data;
mutex_init(&data->lock);
init_completion(&data->rising);
@@ -280,13 +307,6 @@ static int srf04_probe(struct platform_device *pdev)
return devm_iio_device_register(dev, indio_dev);
}
-static const struct of_device_id of_srf04_match[] = {
- { .compatible = "devantech,srf04", },
- {},
-};
-
-MODULE_DEVICE_TABLE(of, of_srf04_match);
-
static struct platform_driver srf04_driver = {
.probe = srf04_probe,
.driver = {