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@xxxxxxx>
---
Documentation/hwmon/ads1015 | 8 ++++++--
drivers/hwmon/Kconfig | 4 ++--
drivers/hwmon/ads1015.c | 28 +++++++++++++++++++++++-----
3 files changed, 31 insertions(+), 9 deletions(-)
diff --git a/Documentation/hwmon/ads1015 b/Documentation/hwmon/ads1015
index f6fe9c2..063b80d 100644
--- a/Documentation/hwmon/ads1015
+++ b/Documentation/hwmon/ads1015
@@ -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@xxxxxxxx>
@@ -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.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e989f7f..47b3e58 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -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.
diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c
index 2798246..d542a70 100644
--- a/drivers/hwmon/ads1015.c
+++ b/drivers/hwmon/ads1015.c
@@ -46,8 +46,13 @@ 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
@@ -57,6 +62,12 @@ struct ads1015_data {
struct device *hwmon_dev;
struct mutex update_lock; /* mutex protect updates */
struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
+ int id;
+};
+
+enum ads1015_num_id {
+ ads1015,
+ ads1115,
};
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 */
@@ -277,6 +291,9 @@ static int ads1015_probe(struct i2c_client *client,
goto exit_remove;
}
+ data->id = id->driver_data;
+ pr_debug("%s: id %d\n", __func__, data->id);
+
return 0;
exit_remove:
@@ -286,7 +303,8 @@ exit_remove:
}
static const struct i2c_device_id ads1015_id[] = {
- { "ads1015", 0 },
+ { "ads1015", ads1015},
+ { "ads1115", ads1115},
{ }
};
MODULE_DEVICE_TABLE(i2c, ads1015_id);
--
1.8.1.5
--
/Evgeniy
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