misc: bmp085: add device tree properties

Reviewed-by: Stefan Nilsson <stefan.nilsson@unixphere.com>
Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 57 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/misc/bmp085.txt b/Documentation/devicetree/bindings/misc/bmp085.txt
new file mode 100644
index 000000000000..91dfda2e4e11
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/bmp085.txt
@@ -0,0 +1,20 @@
+BMP085/BMP18x digital pressure sensors
+
+Required properties:
+- compatible: bosch,bmp085
+
+Optional properties:
+- chip-id: configurable chip id for non-default chip revisions
+- temp-measurement-period: temperature measurement period (milliseconds)
+- default-oversampling: default oversampling value to be used at startup,
+  value range is 0-3 with rising sensitivity.
+
+Example:
+
+pressure@77 {
+        compatible = "bosch,bmp085";
+        reg = <0x77>;
+        chip-id = <10>;
+        temp-measurement-period = <100>;
+        default-oversampling = <2>;
+};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 82ac057a24a9..107d8addf0e4 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -8,6 +8,7 @@ amcc	Applied Micro Circuits Corporation (APM, formally AMCC)
 apm     Applied Micro Circuits Corporation (APM)
 arm     ARM Ltd.
 atmel   Atmel Corporation
+bosch   Bosch Sensortec GmbH
 cavium  Cavium, Inc.
 chrp    Common Hardware Reference Platform
 cortina Cortina Systems, Inc.
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 6f572bc21879..6adde9e1a0d1 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -50,6 +50,7 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/of.h>
 
 #define BMP085_NAME                     "bmp085"
 #define BMP085_I2C_ADDRESS              0x77
@@ -85,6 +86,7 @@ struct bmp085_data {
         u32     raw_pressure;
         u32     temp_measurement_period;
         unsigned long last_temp_measurement;
+        u8      chip_id;
         s32     b6; /* calculated temperature correction coefficient */
 };
 
@@ -385,6 +387,27 @@ static int bmp085_detect(struct i2c_client *client, struct i2c_board_info *info)
         return 0;
 }
 
+static void __init bmp085_get_of_properties(struct i2c_client *client,
+                                            struct bmp085_data *data)
+{
+#ifdef CONFIG_OF
+        struct device_node *np = client->dev.of_node;
+        u32 prop;
+
+        if (!np)
+                return;
+
+        if (!of_property_read_u32(np, "chip-id", &prop))
+                data->chip_id = prop & 0xff;
+
+        if (!of_property_read_u32(np, "temp-measurement-period", &prop))
+                data->temp_measurement_period = (prop/100)*HZ;
+
+        if (!of_property_read_u32(np, "default-oversampling", &prop))
+                data->oversampling_setting = prop & 0xff;
+#endif
+}
+
 static int bmp085_init_client(struct i2c_client *client)
 {
         struct bmp085_data *data = i2c_get_clientdata(client);
@@ -393,10 +416,15 @@ static int bmp085_init_client(struct i2c_client *client)
         if (status < 0)
                 return status;
 
+        /* default settings */
         data->client = client;
+        data->chip_id = BMP085_CHIP_ID;
         data->last_temp_measurement = 0;
         data->temp_measurement_period = 1*HZ;
         data->oversampling_setting = 3;
+
+        bmp085_get_of_properties(client, data);
+
         mutex_init(&data->lock);
 
         return 0;
@@ -446,6 +474,12 @@ static int __devexit bmp085_remove(struct i2c_client *client)
         return 0;
 }
 
+static const struct of_device_id bmp085_of_match[] = {
+        { .compatible = "bosch,bmp085", },
+        { },
+};
+MODULE_DEVICE_TABLE(of, bmp085_of_match);
+
 static const struct i2c_device_id bmp085_id[] = {
         { BMP085_NAME, 0 },
         { }
@@ -455,7 +489,8 @@ MODULE_DEVICE_TABLE(i2c, bmp085_id);
 static struct i2c_driver bmp085_driver = {
         .driver = {
                 .owner = THIS_MODULE,
-                .name   = BMP085_NAME
+                .name   = BMP085_NAME,
+                .of_match_table = bmp085_of_match
         },
         .id_table       = bmp085_id,
         .probe          = bmp085_probe,