diff options
Diffstat (limited to 'drivers/misc/bmp085.c')
| -rw-r--r-- | drivers/misc/bmp085.c | 163 |
1 files changed, 67 insertions, 96 deletions
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c index 6adde9e..62e4182 100644 --- a/drivers/misc/bmp085.c +++ b/drivers/misc/bmp085.c @@ -2,10 +2,11 @@ * Copyright (c) 2012 Bosch Sensortec GmbH * Copyright (c) 2012 Unixphere AB * - * This driver supports the bmp085 digital barometric pressure - * and temperature sensor from Bosch Sensortec. The datasheet - * is available from their website: + * This driver supports the bmp085 and bmp18x digital barometric pressure + * and temperature sensors from Bosch Sensortec. The datasheets + * are available from their website: * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.pdf + * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP180-DS000-07.pdf * * A pressure measurement is issued by reading from pressure0_input. * The return value ranges from 30000 to 110000 pascal with a resulution @@ -47,15 +48,12 @@ #include <linux/module.h> #include <linux/device.h> #include <linux/init.h> -#include <linux/i2c.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/of.h> +#include "bmp085.h" -#define BMP085_NAME "bmp085" -#define BMP085_I2C_ADDRESS 0x77 #define BMP085_CHIP_ID 0x55 - #define BMP085_CALIBRATION_DATA_START 0xAA #define BMP085_CALIBRATION_DATA_LENGTH 11 /* 16 bit values */ #define BMP085_CHIP_ID_REG 0xD0 @@ -67,9 +65,6 @@ #define BMP085_CONVERSION_REGISTER_XLSB 0xF8 #define BMP085_TEMP_CONVERSION_TIME 5 -static const unsigned short normal_i2c[] = { BMP085_I2C_ADDRESS, - I2C_CLIENT_END }; - struct bmp085_calibration_data { s16 AC1, AC2, AC3; u16 AC4, AC5, AC6; @@ -78,7 +73,8 @@ struct bmp085_calibration_data { }; struct bmp085_data { - struct i2c_client *client; + struct device *dev; + struct regmap *regmap; struct mutex lock; struct bmp085_calibration_data calibration; u8 oversampling_setting; @@ -90,21 +86,16 @@ struct bmp085_data { s32 b6; /* calculated temperature correction coefficient */ }; -static s32 bmp085_read_calibration_data(struct i2c_client *client) +static s32 bmp085_read_calibration_data(struct bmp085_data *data) { u16 tmp[BMP085_CALIBRATION_DATA_LENGTH]; - struct bmp085_data *data = i2c_get_clientdata(client); struct bmp085_calibration_data *cali = &(data->calibration); - s32 status = i2c_smbus_read_i2c_block_data(client, - BMP085_CALIBRATION_DATA_START, - (BMP085_CALIBRATION_DATA_LENGTH << 1), - (u8 *)tmp); + s32 status = regmap_bulk_read(data->regmap, + BMP085_CALIBRATION_DATA_START, (u8 *)tmp, + (BMP085_CALIBRATION_DATA_LENGTH << 1)); if (status < 0) return status; - if (status != (BMP085_CALIBRATION_DATA_LENGTH << 1)) - return -EIO; - cali->AC1 = be16_to_cpu(tmp[0]); cali->AC2 = be16_to_cpu(tmp[1]); cali->AC3 = be16_to_cpu(tmp[2]); @@ -125,23 +116,20 @@ static s32 bmp085_update_raw_temperature(struct bmp085_data *data) s32 status; mutex_lock(&data->lock); - status = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG, - BMP085_TEMP_MEASUREMENT); + status = regmap_write(data->regmap, BMP085_CTRL_REG, + BMP085_TEMP_MEASUREMENT); if (status < 0) { - dev_err(&data->client->dev, + dev_err(data->dev, "Error while requesting temperature measurement.\n"); goto exit; } msleep(BMP085_TEMP_CONVERSION_TIME); - status = i2c_smbus_read_i2c_block_data(data->client, - BMP085_CONVERSION_REGISTER_MSB, sizeof(tmp), (u8 *)&tmp); - if (status < 0) - goto exit; - if (status != sizeof(tmp)) { - dev_err(&data->client->dev, + status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB, + &tmp, sizeof(tmp)); + if (status < 0) { + dev_err(data->dev, "Error while reading temperature measurement result\n"); - status = -EIO; goto exit; } data->raw_temperature = be16_to_cpu(tmp); @@ -159,11 +147,11 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data) s32 status; mutex_lock(&data->lock); - status = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG, + status = regmap_write(data->regmap, BMP085_CTRL_REG, BMP085_PRESSURE_MEASUREMENT + (data->oversampling_setting << 6)); if (status < 0) { - dev_err(&data->client->dev, + dev_err(data->dev, "Error while requesting pressure measurement.\n"); goto exit; } @@ -172,14 +160,11 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data) msleep(2+(3 << data->oversampling_setting)); /* copy data into a u32 (4 bytes), but skip the first byte. */ - status = i2c_smbus_read_i2c_block_data(data->client, - BMP085_CONVERSION_REGISTER_MSB, 3, ((u8 *)&tmp)+1); - if (status < 0) - goto exit; - if (status != 3) { - dev_err(&data->client->dev, + status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB, + ((u8 *)&tmp)+1, 3); + if (status < 0) { + dev_err(data->dev, "Error while reading pressure measurement results\n"); - status = -EIO; goto exit; } data->raw_pressure = be32_to_cpu((tmp)); @@ -304,8 +289,7 @@ static ssize_t set_oversampling(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct i2c_client *client = to_i2c_client(dev); - struct bmp085_data *data = i2c_get_clientdata(client); + struct bmp085_data *data = dev_get_drvdata(dev); unsigned long oversampling; int err = kstrtoul(buf, 10, &oversampling); @@ -322,8 +306,7 @@ static ssize_t set_oversampling(struct device *dev, static ssize_t show_oversampling(struct device *dev, struct device_attribute *attr, char *buf) { - struct i2c_client *client = to_i2c_client(dev); - struct bmp085_data *data = i2c_get_clientdata(client); + struct bmp085_data *data = dev_get_drvdata(dev); return sprintf(buf, "%u\n", bmp085_get_oversampling(data)); } @@ -336,8 +319,7 @@ static ssize_t show_temperature(struct device *dev, { int temperature; int status; - struct i2c_client *client = to_i2c_client(dev); - struct bmp085_data *data = i2c_get_clientdata(client); + struct bmp085_data *data = dev_get_drvdata(dev); status = bmp085_get_temperature(data, &temperature); if (status < 0) @@ -353,8 +335,7 @@ static ssize_t show_pressure(struct device *dev, { int pressure; int status; - struct i2c_client *client = to_i2c_client(dev); - struct bmp085_data *data = i2c_get_clientdata(client); + struct bmp085_data *data = dev_get_drvdata(dev); status = bmp085_get_pressure(data, &pressure); if (status < 0) @@ -376,22 +357,27 @@ static const struct attribute_group bmp085_attr_group = { .attrs = bmp085_attributes, }; -static int bmp085_detect(struct i2c_client *client, struct i2c_board_info *info) +int bmp085_detect(struct device *dev) { - if (client->addr != BMP085_I2C_ADDRESS) - return -ENODEV; + struct bmp085_data *data = dev_get_drvdata(dev); + unsigned int id; + int ret; + + ret = regmap_read(data->regmap, BMP085_CHIP_ID_REG, &id); + if (ret < 0) + return ret; - if (i2c_smbus_read_byte_data(client, BMP085_CHIP_ID_REG) != BMP085_CHIP_ID) + if (id != data->chip_id) return -ENODEV; return 0; } +EXPORT_SYMBOL_GPL(bmp085_detect); -static void __init bmp085_get_of_properties(struct i2c_client *client, - struct bmp085_data *data) +static void __init bmp085_get_of_properties(struct bmp085_data *data) { #ifdef CONFIG_OF - struct device_node *np = client->dev.of_node; + struct device_node *np = data->dev->of_node; u32 prop; if (!np) @@ -408,30 +394,33 @@ static void __init bmp085_get_of_properties(struct i2c_client *client, #endif } -static int bmp085_init_client(struct i2c_client *client) +static int bmp085_init_client(struct bmp085_data *data) { - struct bmp085_data *data = i2c_get_clientdata(client); - int status = bmp085_read_calibration_data(client); + int status = bmp085_read_calibration_data(data); 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); + bmp085_get_of_properties(data); mutex_init(&data->lock); return 0; } -static int __devinit bmp085_probe(struct i2c_client *client, - const struct i2c_device_id *id) +struct regmap_config bmp085_regmap_config = { + .reg_bits = 8, + .val_bits = 8 +}; +EXPORT_SYMBOL_GPL(bmp085_regmap_config); + +__devinit int bmp085_probe(struct device *dev, struct regmap *regmap) { struct bmp085_data *data; int err = 0; @@ -442,19 +431,27 @@ static int __devinit bmp085_probe(struct i2c_client *client, goto exit; } - i2c_set_clientdata(client, data); + dev_set_drvdata(dev, data); + data->dev = dev; + data->regmap = regmap; /* Initialize the BMP085 chip */ - err = bmp085_init_client(client); + err = bmp085_init_client(data); if (err < 0) goto exit_free; + err = bmp085_detect(dev); + if (err < 0) { + dev_err(dev, "%s: chip_id failed!\n", BMP085_NAME); + goto exit_free; + } + /* Register sysfs hooks */ - err = sysfs_create_group(&client->dev.kobj, &bmp085_attr_group); + err = sysfs_create_group(&dev->kobj, &bmp085_attr_group); if (err) goto exit_free; - dev_info(&client->dev, "Successfully initialized %s!\n", BMP085_NAME); + dev_info(dev, "Successfully initialized %s!\n", BMP085_NAME); return 0; @@ -463,44 +460,18 @@ exit_free: exit: return err; } +EXPORT_SYMBOL_GPL(bmp085_probe); -static int __devexit bmp085_remove(struct i2c_client *client) +int bmp085_remove(struct device *dev) { - struct bmp085_data *data = i2c_get_clientdata(client); + struct bmp085_data *data = dev_get_drvdata(dev); - sysfs_remove_group(&client->dev.kobj, &bmp085_attr_group); + sysfs_remove_group(&data->dev->kobj, &bmp085_attr_group); kfree(data); 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 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, bmp085_id); - -static struct i2c_driver bmp085_driver = { - .driver = { - .owner = THIS_MODULE, - .name = BMP085_NAME, - .of_match_table = bmp085_of_match - }, - .id_table = bmp085_id, - .probe = bmp085_probe, - .remove = __devexit_p(bmp085_remove), - - .detect = bmp085_detect, - .address_list = normal_i2c -}; - -module_i2c_driver(bmp085_driver); +EXPORT_SYMBOL_GPL(bmp085_remove); MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com>"); MODULE_DESCRIPTION("BMP085 driver"); |
