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authorBhuvanchandra DV <bhuvanchandra.dv@toradex.com>2016-03-30 01:20:43 +0530
committerStefan Agner <stefan.agner@toradex.com>2016-03-29 22:57:03 -0700
commit88c66ffd8ed6cd50e436ce0d5830cd27f93259a2 (patch)
tree77738ca8d8167a23f38dd5fbc9c29f2da9529a3e /drivers/spi/spi.c
parentb84a7643279332aca39d4be85d47c0734802c91e (diff)
spi core: Add new sysfs 'num_chipselect' fileColibri_VF_LinuxImageV2.6Beta1_20160331
Add new sysfs 'num_chipselect' file to expose the maximum number of chipselects a SPI master can support. This allows to create a script in user space which automatically creates a new spidev instance for every chipselect on a bus. Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com> Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r--drivers/spi/spi.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index dee1cb87d24f..06fb3dd1b297 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -67,6 +67,19 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf)
}
static DEVICE_ATTR_RO(modalias);
+static ssize_t
+num_chipselect_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+ struct spi_master *master = container_of(dev,
+ struct spi_master, dev);
+
+ return sprintf(buf, "%d\n", master->num_chipselect);
+}
+static struct device_attribute dev_attr_num_chipselect = {
+ .attr = { .name = "num_chipselect", .mode = S_IRUGO },
+ .show = num_chipselect_show,
+};
+
#define SPI_STATISTICS_ATTRS(field, file) \
static ssize_t spi_master_##field##_show(struct device *dev, \
struct device_attribute *attr, \
@@ -154,6 +167,15 @@ static const struct attribute_group spi_dev_group = {
.attrs = spi_dev_attrs,
};
+static struct attribute *spi_master_attrs[] = {
+ &dev_attr_num_chipselect.attr,
+ NULL,
+};
+
+static const struct attribute_group spi_master_group = {
+ .attrs = spi_master_attrs,
+};
+
static struct attribute *spi_device_statistics_attrs[] = {
&dev_attr_spi_device_messages.attr,
&dev_attr_spi_device_transfers.attr,
@@ -233,6 +255,7 @@ static const struct attribute_group spi_master_statistics_group = {
};
static const struct attribute_group *spi_master_groups[] = {
+ &spi_master_group,
&spi_master_statistics_group,
NULL,
};