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>

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;