diff options
| -rw-r--r-- | Documentation/devicetree/bindings/misc/bmp085.txt | 20 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/vendor-prefixes.txt | 1 | ||||
| -rw-r--r-- | drivers/misc/bmp085.c | 37 |
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 0000000..91dfda2 --- /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 82ac057..107d8ad 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 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, |
