diff options
Diffstat (limited to 'drivers/iio/adc/ti-adc081c.c')
| -rw-r--r-- | drivers/iio/adc/ti-adc081c.c | 118 |
1 files changed, 106 insertions, 12 deletions
diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c index ecbc12138..9fd032d9f 100644 --- a/drivers/iio/adc/ti-adc081c.c +++ b/drivers/iio/adc/ti-adc081c.c @@ -1,9 +1,21 @@ /* + * TI ADC081C/ADC101C/ADC121C 8/10/12-bit ADC driver + * * Copyright (C) 2012 Avionic Design GmbH + * Copyright (C) 2016 Intel * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. + * + * Datasheets: + * http://www.ti.com/lit/ds/symlink/adc081c021.pdf + * http://www.ti.com/lit/ds/symlink/adc101c021.pdf + * http://www.ti.com/lit/ds/symlink/adc121c021.pdf + * + * The devices have a very similar interface and differ mostly in the number of + * bits handled. For the 8-bit and 10-bit models the least-significant 4 or 2 + * bits of value registers are reserved. */ #include <linux/err.h> @@ -12,11 +24,17 @@ #include <linux/of.h> #include <linux/iio/iio.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> #include <linux/regulator/consumer.h> struct adc081c { struct i2c_client *i2c; struct regulator *ref; + + /* 8, 10 or 12 */ + int bits; }; #define REG_CONV_RES 0x00 @@ -34,7 +52,7 @@ static int adc081c_read_raw(struct iio_dev *iio, if (err < 0) return err; - *value = (err >> 4) & 0xff; + *value = (err & 0xFFF) >> (12 - adc->bits); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: @@ -43,7 +61,7 @@ static int adc081c_read_raw(struct iio_dev *iio, return err; *value = err / 1000; - *shift = 8; + *shift = adc->bits; return IIO_VAL_FRACTIONAL_LOG2; @@ -54,10 +72,53 @@ static int adc081c_read_raw(struct iio_dev *iio, return -EINVAL; } -static const struct iio_chan_spec adc081c_channel = { - .type = IIO_VOLTAGE, - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), +#define ADCxx1C_CHAN(_bits) { \ + .type = IIO_VOLTAGE, \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = (_bits), \ + .storagebits = 16, \ + .shift = 12 - (_bits), \ + .endianness = IIO_CPU, \ + }, \ +} + +#define DEFINE_ADCxx1C_CHANNELS(_name, _bits) \ + static const struct iio_chan_spec _name ## _channels[] = { \ + ADCxx1C_CHAN((_bits)), \ + IIO_CHAN_SOFT_TIMESTAMP(1), \ + }; \ + +#define ADC081C_NUM_CHANNELS 2 + +struct adcxx1c_model { + const struct iio_chan_spec* channels; + int bits; +}; + +#define ADCxx1C_MODEL(_name, _bits) \ + { \ + .channels = _name ## _channels, \ + .bits = (_bits), \ + } + +DEFINE_ADCxx1C_CHANNELS(adc081c, 8); +DEFINE_ADCxx1C_CHANNELS(adc101c, 10); +DEFINE_ADCxx1C_CHANNELS(adc121c, 12); + +/* Model ids are indexes in _models array */ +enum adcxx1c_model_id { + ADC081C = 0, + ADC101C = 1, + ADC121C = 2, +}; + +static struct adcxx1c_model adcxx1c_models[] = { + ADCxx1C_MODEL(adc081c, 8), + ADCxx1C_MODEL(adc101c, 10), + ADCxx1C_MODEL(adc121c, 12), }; static const struct iio_info adc081c_info = { @@ -65,11 +126,30 @@ static const struct iio_info adc081c_info = { .driver_module = THIS_MODULE, }; +static irqreturn_t adc081c_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct adc081c *data = iio_priv(indio_dev); + u16 buf[8]; /* 2 bytes data + 6 bytes padding + 8 bytes timestamp */ + int ret; + + ret = i2c_smbus_read_word_swapped(data->i2c, REG_CONV_RES); + if (ret < 0) + goto out; + buf[0] = ret; + iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns()); +out: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + static int adc081c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct iio_dev *iio; struct adc081c *adc; + struct adcxx1c_model *model = &adcxx1c_models[id->driver_data]; int err; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) @@ -81,6 +161,7 @@ static int adc081c_probe(struct i2c_client *client, adc = iio_priv(iio); adc->i2c = client; + adc->bits = model->bits; adc->ref = devm_regulator_get(&client->dev, "vref"); if (IS_ERR(adc->ref)) @@ -95,18 +176,26 @@ static int adc081c_probe(struct i2c_client *client, iio->modes = INDIO_DIRECT_MODE; iio->info = &adc081c_info; - iio->channels = &adc081c_channel; - iio->num_channels = 1; + iio->channels = model->channels; + iio->num_channels = ADC081C_NUM_CHANNELS; + + err = iio_triggered_buffer_setup(iio, NULL, adc081c_trigger_handler, NULL); + if (err < 0) { + dev_err(&client->dev, "iio triggered buffer setup failed\n"); + goto err_regulator_disable; + } err = iio_device_register(iio); if (err < 0) - goto regulator_disable; + goto err_buffer_cleanup; i2c_set_clientdata(client, iio); return 0; -regulator_disable: +err_buffer_cleanup: + iio_triggered_buffer_cleanup(iio); +err_regulator_disable: regulator_disable(adc->ref); return err; @@ -118,13 +207,16 @@ static int adc081c_remove(struct i2c_client *client) struct adc081c *adc = iio_priv(iio); iio_device_unregister(iio); + iio_triggered_buffer_cleanup(iio); regulator_disable(adc->ref); return 0; } static const struct i2c_device_id adc081c_id[] = { - { "adc081c", 0 }, + { "adc081c", ADC081C }, + { "adc101c", ADC101C }, + { "adc121c", ADC121C }, { } }; MODULE_DEVICE_TABLE(i2c, adc081c_id); @@ -132,6 +224,8 @@ MODULE_DEVICE_TABLE(i2c, adc081c_id); #ifdef CONFIG_OF static const struct of_device_id adc081c_of_match[] = { { .compatible = "ti,adc081c" }, + { .compatible = "ti,adc101c" }, + { .compatible = "ti,adc121c" }, { } }; MODULE_DEVICE_TABLE(of, adc081c_of_match); @@ -149,5 +243,5 @@ static struct i2c_driver adc081c_driver = { module_i2c_driver(adc081c_driver); MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); -MODULE_DESCRIPTION("Texas Instruments ADC081C021/027 driver"); +MODULE_DESCRIPTION("Texas Instruments ADC081C/ADC101C/ADC121C driver"); MODULE_LICENSE("GPL v2"); |