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path: root/drivers/gpio/pca953x.c
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Diffstat (limited to 'drivers/gpio/pca953x.c')
-rw-r--r--drivers/gpio/pca953x.c75
1 files changed, 70 insertions, 5 deletions
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 2dae94fbabf..e9d6d5bdd30 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -15,6 +15,10 @@
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>
+#ifdef CONFIG_OF_GPIO
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#endif
#include <asm/gpio.h>
@@ -49,6 +53,7 @@ struct pca953x_chip {
uint16_t reg_direction;
struct i2c_client *client;
+ struct pca953x_platform_data *dyn_pdata;
struct gpio_chip gpio_chip;
char **names;
};
@@ -196,6 +201,54 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
gc->names = chip->names;
}
+/*
+ * Handlers for alternative sources of platform_data
+ */
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static struct pca953x_platform_data *
+pca953x_get_alt_pdata(struct i2c_client *client)
+{
+ struct pca953x_platform_data *pdata;
+ struct device_node *node;
+ const uint16_t *val;
+
+ node = dev_archdata_get_node(&client->dev.archdata);
+ if (node == NULL)
+ return NULL;
+
+ pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
+ if (pdata == NULL) {
+ dev_err(&client->dev, "Unable to allocate platform_data\n");
+ return NULL;
+ }
+
+ pdata->gpio_base = -1;
+ val = of_get_property(node, "linux,gpio-base", NULL);
+ if (val) {
+ if (*val < 0)
+ dev_warn(&client->dev,
+ "invalid gpio-base in device tree\n");
+ else
+ pdata->gpio_base = *val;
+ }
+
+ val = of_get_property(node, "polarity", NULL);
+ if (val)
+ pdata->invert = *val;
+
+ return pdata;
+}
+#else
+static struct pca953x_platform_data *
+pca953x_get_alt_pdata(struct i2c_client *client)
+{
+ return NULL;
+}
+#endif
+
static int __devinit pca953x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -203,15 +256,25 @@ static int __devinit pca953x_probe(struct i2c_client *client,
struct pca953x_chip *chip;
int ret;
+ chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
+ if (chip == NULL)
+ return -ENOMEM;
+
pdata = client->dev.platform_data;
if (pdata == NULL) {
- dev_dbg(&client->dev, "no platform data\n");
- return -EINVAL;
+ pdata = pca953x_get_alt_pdata(client);
+ /*
+ * Unlike normal platform_data, this is allocated
+ * dynamically and must be freed in the driver
+ */
+ chip->dyn_pdata = pdata;
}
- chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
- if (chip == NULL)
- return -ENOMEM;
+ if (pdata == NULL) {
+ dev_dbg(&client->dev, "no platform data\n");
+ ret = -EINVAL;
+ goto out_failed;
+ }
chip->client = client;
@@ -253,6 +316,7 @@ static int __devinit pca953x_probe(struct i2c_client *client,
return 0;
out_failed:
+ kfree(chip->dyn_pdata);
kfree(chip);
return ret;
}
@@ -280,6 +344,7 @@ static int pca953x_remove(struct i2c_client *client)
return ret;
}
+ kfree(chip->dyn_pdata);
kfree(chip);
return 0;
}