gpio: pca953x: support ACPI devices found on Galileo Gen2

This patch adds a support of the expandes found on Intel Galileo Gen2 board.
The platform information comes from ACPI.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 27c96ce..2d4892c 100644 (file)
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -21,6 +21,7 @@
 #ifdef CONFIG_OF_GPIO
 #include <linux/of_platform.h>
 #endif
+#include <linux/acpi.h>
 
 #define PCA953X_INPUT          0
 #define PCA953X_OUTPUT         1
@@ -76,6 +77,12 @@ static const struct i2c_device_id pca953x_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 
+static const struct acpi_device_id pca953x_acpi_ids[] = {
+       { "INT3491", 16 | PCA953X_TYPE | PCA_INT, },
+       { }
+};
+MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
+
 #define MAX_BANK 5
 #define BANK_SZ 8
 
@@ -680,7 +687,18 @@ static int pca953x_probe(struct i2c_client *client,
 
        chip->client = client;
 
-       chip->driver_data = id->driver_data;
+       if (id) {
+               chip->driver_data = id->driver_data;
+       } else {
+               const struct acpi_device_id *id;
+
+               id = acpi_match_device(pca953x_acpi_ids, &client->dev);
+               if (!id)
+                       return -ENODEV;
+
+               chip->driver_data = id->driver_data;
+       }
+
        chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);
 
        mutex_init(&chip->i2c_lock);
@@ -773,6 +791,7 @@ static struct i2c_driver pca953x_driver = {
        .driver = {
                .name   = "pca953x",
                .of_match_table = pca953x_dt_ids,
+               .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
        },
        .probe          = pca953x_probe,
        .remove         = pca953x_remove,