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authorCory Tusar <cory.tusar@pid1solutions.com>2016-02-10 14:32:08 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-11 19:23:28 -0800
commit3ca9b1ac28398c6fe0bed335d2d71a35e1c5f7c9 (patch)
tree7c4bc01765b20b0f281648ff7833a7cbd8b94516 /drivers/misc/eeprom/eeprom_93xx46.c
parente1379b56e9e88653fcb58cbaa71cd6b1cc304918 (diff)
downloadlinux-3ca9b1ac28398c6fe0bed335d2d71a35e1c5f7c9.tar.bz2
misc: eeprom_93xx46: Add support for a GPIO 'select' line.
This commit adds support to the eeprom_93x46 driver allowing a GPIO line to function as a 'select' or 'enable' signal prior to accessing the EEPROM. Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com> Tested-by: Chris Healy <chris.healy@zii.aero> Reviewed-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/eeprom/eeprom_93xx46.c')
-rw-r--r--drivers/misc/eeprom/eeprom_93xx46.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/eeprom_93xx46.c b/drivers/misc/eeprom/eeprom_93xx46.c
index a3c3136abf3e..f62ab29e293c 100644
--- a/drivers/misc/eeprom/eeprom_93xx46.c
+++ b/drivers/misc/eeprom/eeprom_93xx46.c
@@ -10,11 +10,13 @@
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>
@@ -343,6 +345,20 @@ static ssize_t eeprom_93xx46_store_erase(struct device *dev,
}
static DEVICE_ATTR(erase, S_IWUSR, NULL, eeprom_93xx46_store_erase);
+static void select_assert(void *context)
+{
+ struct eeprom_93xx46_dev *edev = context;
+
+ gpiod_set_value_cansleep(edev->pdata->select, 1);
+}
+
+static void select_deassert(void *context)
+{
+ struct eeprom_93xx46_dev *edev = context;
+
+ gpiod_set_value_cansleep(edev->pdata->select, 0);
+}
+
static const struct of_device_id eeprom_93xx46_of_table[] = {
{ .compatible = "eeprom-93xx46", },
{ .compatible = "atmel,at93c46d", .data = &atmel_at93c46d_data, },
@@ -357,6 +373,8 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
struct device_node *np = spi->dev.of_node;
struct eeprom_93xx46_platform_data *pd;
u32 tmp;
+ int gpio;
+ enum of_gpio_flags of_flags;
int ret;
pd = devm_kzalloc(&spi->dev, sizeof(*pd), GFP_KERNEL);
@@ -381,6 +399,23 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
if (of_property_read_bool(np, "read-only"))
pd->flags |= EE_READONLY;
+ gpio = of_get_named_gpio_flags(np, "select-gpios", 0, &of_flags);
+ if (gpio_is_valid(gpio)) {
+ unsigned long flags =
+ of_flags == OF_GPIO_ACTIVE_LOW ? GPIOF_ACTIVE_LOW : 0;
+
+ ret = devm_gpio_request_one(&spi->dev, gpio, flags,
+ "eeprom_93xx46_select");
+ if (ret)
+ return ret;
+
+ pd->select = gpio_to_desc(gpio);
+ pd->prepare = select_assert;
+ pd->finish = select_deassert;
+
+ gpiod_direction_output(pd->select, 0);
+ }
+
if (of_id->data) {
const struct eeprom_93xx46_devtype_data *data = of_id->data;