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hwmon: (ads1015) Add support for ADS1115

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This patch adds support for ads1115 device to ads1015 driver.
Based on work of Emiliano Carnati <carnatiatebneuro.com>.
Tested on ARM CPU based board.

Signed-off-by: Evgeniy A. Dushistov <dushistov@mail.ru>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Evgeniy Dushistov 2013-08-01 23:23:48 +04:00 • committed by Guenter Roeck
parent e3b20b3f58
commit 60c1f31fc5
3 changed files with 29 additions and 10 deletions
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8
Documentation/hwmon/ads1015
View file

@ -6,6 +6,10 @@ Supported chips:
Prefix: 'ads1015'
Datasheet: Publicly available at the Texas Instruments website :
http://focus.ti.com/lit/ds/symlink/ads1015.pdf
* Texas Instruments ADS1115
Prefix: 'ads1115'
Datasheet: Publicly available at the Texas Instruments website :
http://focus.ti.com/lit/ds/symlink/ads1115.pdf
Authors:
Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de>
@ -13,9 +17,9 @@ Authors:
Description
-----------
This driver implements support for the Texas Instruments ADS1015.
This driver implements support for the Texas Instruments ADS1015/ADS1115.
This device is a 12-bit A-D converter with 4 inputs.
This device is a 12/16-bit A-D converter with 4 inputs.
The inputs can be used single ended or in certain differential combinations.

4
drivers/hwmon/Kconfig
View file

@ -1202,8 +1202,8 @@ 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.
If you say yes here you get support for Texas Instruments
ADS1015/ADS1115 12/16-bit 4-input ADC device.
This driver can also be built as a module. If so, the module
will be called ads1015.

27
drivers/hwmon/ads1015.c
View file

@ -46,17 +46,28 @@ static const unsigned int fullscale_table[8] = {
6144, 4096, 2048, 1024, 512, 256, 256, 256 };
/* Data rates in samples per second */
static const unsigned int data_rate_table[8] = {
128, 250, 490, 920, 1600, 2400, 3300, 3300 };
static const unsigned int data_rate_table_1015[8] = {
128, 250, 490, 920, 1600, 2400, 3300, 3300
};
static const unsigned int data_rate_table_1115[8] = {
8, 16, 32, 64, 128, 250, 475, 860
};
#define ADS1015_DEFAULT_CHANNELS 0xff
#define ADS1015_DEFAULT_PGA 2
#define ADS1015_DEFAULT_DATA_RATE 4
enum ads1015_chips {
ads1015,
ads1115,
};
struct ads1015_data {
struct device *hwmon_dev;
struct mutex update_lock; /* mutex protect updates */
struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
enum ads1015_chips id;
};
static int ads1015_read_adc(struct i2c_client *client, unsigned int channel)
@ -66,6 +77,8 @@ static int ads1015_read_adc(struct i2c_client *client, unsigned int channel)
unsigned int pga = data->channel_data[channel].pga;
unsigned int data_rate = data->channel_data[channel].data_rate;
unsigned int conversion_time_ms;
const unsigned int * const rate_table = data->id == ads1115 ?
data_rate_table_1115 : data_rate_table_1015;
int res;
mutex_lock(&data->update_lock);
@ -75,7 +88,7 @@ static int ads1015_read_adc(struct i2c_client *client, unsigned int channel)
if (res < 0)
goto err_unlock;
config = res;
conversion_time_ms = DIV_ROUND_UP(1000, data_rate_table[data_rate]);
conversion_time_ms = DIV_ROUND_UP(1000, rate_table[data_rate]);
/* setup and start single conversion */
config &= 0x001f;
@ -113,8 +126,9 @@ static int ads1015_reg_to_mv(struct i2c_client *client, unsigned int channel,
struct ads1015_data *data = i2c_get_clientdata(client);
unsigned int pga = data->channel_data[channel].pga;
int fullscale = fullscale_table[pga];
const unsigned mask = data->id == ads1115 ? 0x7fff : 0x7ff0;
return DIV_ROUND_CLOSEST(reg * fullscale, 0x7ff0);
return DIV_ROUND_CLOSEST(reg * fullscale, mask);
}
/* sysfs callback function */
@ -257,7 +271,7 @@ static int ads1015_probe(struct i2c_client *client,
GFP_KERNEL);
if (!data)
return -ENOMEM;
data->id = id->driver_data;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
@ -286,7 +300,8 @@ exit_remove:
}
static const struct i2c_device_id ads1015_id[] = {
{ "ads1015", 0 },
{ "ads1015", ads1015},
{ "ads1115", ads1115},
{ }
};
MODULE_DEVICE_TABLE(i2c, ads1015_id);