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path: root/drivers/misc/bmp085.c
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Diffstat (limited to 'drivers/misc/bmp085.c')
-rw-r--r--drivers/misc/bmp085.c37
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 6f572bc..6adde9e 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,
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