Signed-off-by: Dirk Eibach <eibach@xxxxxxxx> --- Documentation/hwmon/ads1015 | 31 +++++ drivers/hwmon/Kconfig | 10 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/ads1015.c | 269 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 311 insertions(+), 0 deletions(-) create mode 100644 Documentation/hwmon/ads1015 create mode 100644 drivers/hwmon/ads1015.c diff --git a/Documentation/hwmon/ads1015 b/Documentation/hwmon/ads1015 new file mode 100644 index 0000000..3772816 --- /dev/null +++ b/Documentation/hwmon/ads1015 @@ -0,0 +1,31 @@ +Kernel driver ads1015 +===================== + +Supported chips: + * Texas Instruments ADS1015 + Prefix: 'ads1015' + Addresses scanned: I2C 0x48, 0x49, 0x4a, 0x4b + Datasheet: Publicly available at the Texas Instruments website : + http://focus.ti.com/lit/ds/symlink/ads1015.pdf + +Authors: + Dirk Eibach, Guntermann & Drunck GmbH <eibach@xxxxxxxx> + +Description +----------- + +This driver implements support for the Texas Instruments ADS1015. + +This device is a 12-bit A-D converter with 4 inputs. + +The inputs can be used single ended or in certain differential combinations. + +The driver offers access to all available combinations by 7 "virtual" inputs: +in0: Voltage over AIN0 and AIN1. +in1: Voltage over AIN0 and AIN3. +in2: Voltage over AIN1 and AIN3. +in3: Voltage over AIN2 and AIN3. +in4: Voltage over AIN0 and GND. +in5: Voltage over AIN1 and GND. +in6: Voltage over AIN2 and GND. +in7: Voltage over AIN3 and GND. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 773e484..7e247f7 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -871,6 +871,16 @@ config SENSORS_SMSC47B397 This driver can also be built as a module. If so, the module will be called smsc47b397. +config SENSORS_ADS1015 + tristate "Texas Instruments ADS1015" + depends on I2C + help + If you say yes here you get support for Texas Instruments ADS1015 + 12-bit 4-input ADC device. + + This driver can also be built as a module. If so, the module + will be called ads1015. + config SENSORS_ADS7828 tristate "Texas Instruments ADS7828" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index dde02d9..aae4036 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o obj-$(CONFIG_SENSORS_ADM1029) += adm1029.o obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o +obj-$(CONFIG_SENSORS_ADS1015) += ads1015.o obj-$(CONFIG_SENSORS_ADS7828) += ads7828.o obj-$(CONFIG_SENSORS_ADS7871) += ads7871.o obj-$(CONFIG_SENSORS_ADT7411) += adt7411.o diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c new file mode 100644 index 0000000..675fdfe --- /dev/null +++ b/drivers/hwmon/ads1015.c @@ -0,0 +1,269 @@ +/* + * ads1015.c - lm_sensors driver for ads1015 12-bit 4-input ADC + * (C) Copyright 2010 + * Dirk Eibach, Guntermann & Drunck GmbH <eibach@xxxxxxxx> + * + * Based on the ads7828 driver by Steve Hardy. + * + * Datasheet available at: http://focus.ti.com/lit/ds/symlink/ads1015.pdf + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> + +/* ADS1015 registers */ +enum { + ADS1015_CONVERSION = 0, + ADS1015_CONFIG = 1, + ADS1015_LO_THRESH = 2, + ADS1015_HI_THRESH = 3, +}; + +/* PGA fullscale voltages */ +static const unsigned int fullscale_table[] = { + 6144, 4096, 2048, 1024, 512, 256, 256, 256 }; + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, + I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD_1(ads1015); + +/* Each client has this additional data */ +struct ads1015_data { + struct device *hwmon_dev; + struct mutex update_lock; /* mutex protect updates */ +}; + +/* Function declaration - necessary due to function dependencies */ +static int ads1015_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info); +static int ads1015_probe(struct i2c_client *client, + const struct i2c_device_id *id); + + +static s32 ads1015_read_reg(struct i2c_client *client, unsigned int reg) +{ + return swab16(i2c_smbus_read_word_data(client, reg)); +} + +static s32 ads1015_write_reg(struct i2c_client *client, unsigned int reg, + u16 val) +{ + return i2c_smbus_write_word_data(client, reg, swab16(val)); +} + +static int ads1015_read_value(struct i2c_client *client, unsigned int channel) +{ + u16 config; + s16 conversion; + unsigned int pga; + int fullscale; + unsigned int k; + + /* get fullscale voltage */ + config = ads1015_read_reg(client, ADS1015_CONFIG); + pga = (config >> 9) & 0x0007; + fullscale = fullscale_table[pga]; + + /* set channel and start single conversion */ + config &= ~(0x0007 << 12); + config &= ~(0x0001 << 8); + config |= (1 << 15) | (1 << 8) | (channel & 0x0007) << 12; + + /* wait until conversion finished */ + ads1015_write_reg(client, ADS1015_CONFIG, config); + for (k = 0; k < 5; ++k) { + config = ads1015_read_reg(client, ADS1015_CONFIG); + if (config & (1 << 15)) + break; + schedule_timeout(msecs_to_jiffies(1)); + } + + conversion = ads1015_read_reg(client, ADS1015_CONVERSION); + + return conversion * fullscale / 0x7ff0; +} + +/* sysfs callback function */ +static ssize_t show_in(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct i2c_client *client = to_i2c_client(dev); + struct ads1015_data *data = i2c_get_clientdata(client); + int in; + + mutex_lock(&data->update_lock); + in = ads1015_read_value(client, attr->index); + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%d\n", in); +} + +#define in_reg(offset)\ +static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in,\ + NULL, offset) + +in_reg(0); +in_reg(1); +in_reg(2); +in_reg(3); +in_reg(4); +in_reg(5); +in_reg(6); +in_reg(7); + +static struct attribute *ads1015_attributes[] = { + &sensor_dev_attr_in0_input.dev_attr.attr, + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_in3_input.dev_attr.attr, + &sensor_dev_attr_in4_input.dev_attr.attr, + &sensor_dev_attr_in5_input.dev_attr.attr, + &sensor_dev_attr_in6_input.dev_attr.attr, + &sensor_dev_attr_in7_input.dev_attr.attr, + NULL +}; + +static const struct attribute_group ads1015_group = { + .attrs = ads1015_attributes, +}; + +static int ads1015_remove(struct i2c_client *client) +{ + struct ads1015_data *data = i2c_get_clientdata(client); + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &ads1015_group); + kfree(i2c_get_clientdata(client)); + return 0; +} + +static const struct i2c_device_id ads1015_id[] = { + { "ads1015", ads1015 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ads1015_id); + +/* This is the driver that will be inserted */ +static struct i2c_driver ads1015_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "ads1015", + }, + .probe = ads1015_probe, + .remove = ads1015_remove, + .id_table = ads1015_id, + .detect = ads1015_detect, + .address_data = &addr_data, +}; + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int ads1015_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + + /* Check we have a valid client */ + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)) + return -ENODEV; + + /* Now, we do the remaining detection. There is no identification + dedicated register so attempt to sanity check using knowledge of + the chip + - Read from the 8 channels + - Check the bits 0-3 of each result are not set (12 data bits) + */ + if (kind < 0) { + int ch; + for (ch = 0; ch < 8; ++ch) { + u16 in_data; + in_data = ads1015_read_value(client, ch); + if (in_data & 0x000F) { + printk(KERN_DEBUG + "%s : Doesn't look like an ads1015 device\n", + __func__); + return -ENODEV; + } + } + } + + strlcpy(info->type, "ads1015", I2C_NAME_SIZE); + + return 0; +} + +static int ads1015_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ads1015_data *data; + int err; + + data = kzalloc(sizeof(struct ads1015_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &ads1015_group); + if (err) + goto exit_free; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove; + } + + return 0; + +exit_remove: + sysfs_remove_group(&client->dev.kobj, &ads1015_group); +exit_free: + kfree(data); +exit: + return err; +} + +static int __init sensors_ads1015_init(void) +{ + return i2c_add_driver(&ads1015_driver); +} + +static void __exit sensors_ads1015_exit(void) +{ + i2c_del_driver(&ads1015_driver); +} + +MODULE_AUTHOR("Dirk Eibach <eibach@xxxxxxxx>"); +MODULE_DESCRIPTION("ADS1015 driver"); +MODULE_LICENSE("GPL"); + +module_init(sensors_ads1015_init); +module_exit(sensors_ads1015_exit); -- 1.5.6.5 _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
