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[PATCH 2/3] spi: Use consistent MODALIAS values.

 

 

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ddaney.cavm at gmail

May 11, 2012, 3:05 PM

Post #1 of 1 (59 views)
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[PATCH 2/3] spi: Use consistent MODALIAS values.

From: David Daney <david.daney [at] cavium>

For SPI devices, the MODALIAS should start with "spi:" so that the
modprobe can find the proper drivers.

Be consistent, for devices added via spi_new_device(), make sure
"spi:" is added if it is not already there. In spi_match_device()
handle matching when the "spi:" prefix is present.

Signed-off-by: David Daney <david.daney [at] cavium>
---
drivers/spi/spi.c | 39 ++++++++++++++++++++++++++++++++++-----
1 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 3d8f662..8c49964 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -59,6 +59,16 @@ static struct device_attribute spi_dev_attrs[] = {
__ATTR_NULL,
};

+/*
+ * modalias will be of the form "spi:name" or "name", match on just
+ * the name portion.
+ */
+static const char *spi_device_spidev2name(const struct spi_device *sdev)
+{
+ const char *p = strchr(sdev->modalias, ':');
+ return p ? p + 1 : sdev->modalias;
+}
+
/* modalias support makes "modprobe $MODALIAS" new-style hotplug work,
* and the sysfs version makes coldplug work too.
*/
@@ -66,8 +76,10 @@ static struct device_attribute spi_dev_attrs[] = {
static const struct spi_device_id *spi_match_id(const struct spi_device_id *id,
const struct spi_device *sdev)
{
+ const char *name = spi_device_spidev2name(sdev);
+
while (id->name[0]) {
- if (!strcmp(sdev->modalias, id->name))
+ if (!strcmp(name, id->name))
return id;
id++;
}
@@ -94,14 +106,20 @@ static int spi_match_device(struct device *dev, struct device_driver *drv)
if (sdrv->id_table)
return !!spi_match_id(sdrv->id_table, spi);

- return strcmp(spi->modalias, drv->name) == 0;
+ return strcmp(spi_device_spidev2name(spi), drv->name) == 0;
}

static int spi_uevent(struct device *dev, struct kobj_uevent_env *env)
{
const struct spi_device *spi = to_spi_device(dev);

- add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias);
+ if (strncmp(SPI_MODULE_PREFIX, spi->modalias,
+ strlen(SPI_MODULE_PREFIX)) == 0)
+ add_uevent_var(env, "MODALIAS=%s", spi->modalias);
+ else
+ add_uevent_var(env, "MODALIAS=%s%s",
+ SPI_MODULE_PREFIX, spi->modalias);
+
return 0;
}

@@ -418,6 +436,7 @@ struct spi_device *spi_new_device(struct spi_master *master,
{
struct spi_device *proxy;
int status;
+ size_t l;

/* NOTE: caller did any chip->bus_num checks necessary.
*
@@ -430,13 +449,23 @@ struct spi_device *spi_new_device(struct spi_master *master,
if (!proxy)
return NULL;

- WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias));
+ if (strncmp(SPI_MODULE_PREFIX, chip->modalias,
+ strlen(SPI_MODULE_PREFIX)) == 0) {
+ proxy->modalias[0] = 0;
+ } else {
+ l = strlcpy(proxy->modalias, SPI_MODULE_PREFIX,
+ sizeof(proxy->modalias));
+ WARN_ON(l >= sizeof(proxy->modalias));
+ }
+
+ l = strlcat(proxy->modalias, chip->modalias, sizeof(proxy->modalias));
+
+ WARN_ON(l >= sizeof(proxy->modalias));

proxy->chip_select = chip->chip_select;
proxy->max_speed_hz = chip->max_speed_hz;
proxy->mode = chip->mode;
proxy->irq = chip->irq;
- strlcpy(proxy->modalias, chip->modalias, sizeof(proxy->modalias));
proxy->dev.platform_data = (void *) chip->platform_data;
proxy->controller_data = chip->controller_data;
proxy->controller_state = NULL;
--
1.7.2.3

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