From: Duss Pirmin <pirmin.duss@xxxxxxxxx> changes since last version removed boiler plate comments removed table for gain/scale removed trivial wrapper function locking around access to configuration scale is now done via info_mask Signed-off-by: Duss Pirmin <pirmin.duss@xxxxxxxxx> --- drivers/staging/iio/adc/Kconfig | 10 + drivers/staging/iio/adc/Makefile | 1 + drivers/staging/iio/adc/ads1110.c | 332 +++++++++++++++++++++++++++++++++++++ 3 files changed, 343 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/adc/ads1110.c diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index d9decea..ab516dd 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -145,6 +145,16 @@ config AD7192 To compile this driver as a module, choose M here: the module will be called ad7192. +config ADS1110 + tristate "Texas Instruments ADS1110 Analog Digital Converter driver" + depends on I2C + help + Say yes here to build support for Texas Instruments ads1110 ADC. + Provides direct access via sysfs. + + To compile this driver as a module, choose M here: the + module will be called ads1110. + config ADT7310 tristate "Analog Devices ADT7310 temperature sensor driver" depends on SPI diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index ceee7f3..5551e03 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7793) += ad7793.o obj-$(CONFIG_AD7816) += ad7816.o obj-$(CONFIG_AD7192) += ad7192.o +obj-$(CONFIG_ADS1110) += ads1110.o obj-$(CONFIG_ADT7310) += adt7310.o obj-$(CONFIG_ADT7410) += adt7410.o obj-$(CONFIG_AD7280) += ad7280a.o diff --git a/drivers/staging/iio/adc/ads1110.c b/drivers/staging/iio/adc/ads1110.c new file mode 100644 index 0000000..f6bd4e3 --- /dev/null +++ b/drivers/staging/iio/adc/ads1110.c @@ -0,0 +1,332 @@ +/* + * Driver for Texas Instruments ads1110 ADC. + * + * Datashhet con be found on: http://www.ti.com/lit/ds/symlink/ads1110.pdf + * + * Copyright 2011 Flytec AG. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/err.h> + +#include "../iio.h" +#include "../sysfs.h" + +#define ADS1110_DATA_BYTES 2 +#define ADS1110_CONFIG_BYTES 3 + +#define ADS1110_CYC_MASK 0x0C +#define ADS1110_CYC_SHIFT 2 +#define ADS1110_CYC_15 3 +#define ADS1110_CYC_30 2 +#define ADS1110_CYC_60 1 +#define ADS1110_CYC_240 0 + +#define ADS1110_PGA_MASK 0x03 +#define ADS1110_PGA_COUNT 4 + +struct ads1110_chip_info { + struct i2c_client *client; + u8 config; +}; + +static const unsigned int ads1110_frequencies[] = { + [ADS1110_CYC_240] = 240, + [ADS1110_CYC_60] = 60, + [ADS1110_CYC_30] = 30, + [ADS1110_CYC_15] = 15, +}; + +static const struct iio_chan_spec ads1110_channels[] = { + IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, + (1 << IIO_CHAN_INFO_SCALE_SEPARATE), 0, 0, + IIO_ST('s', 16, 16, 0), 0), +}; + +static int ads1110_i2c_read_config(struct ads1110_chip_info *chip, u8 *data) +{ + int ret = 0; + u8 tmp[ADS1110_CONFIG_BYTES]; + + ret = i2c_master_recv(chip->client, tmp, ADS1110_CONFIG_BYTES); + if (ret < ADS1110_CONFIG_BYTES) { + dev_err(&chip->client->dev, "I2C read error\n"); + return ret; + } + + *data = tmp[2]; + + return ret; +} + +static int ads1110_i2c_read_data(struct ads1110_chip_info *chip, int *data) +{ + int ret = 0; + __be16 tmp; + + ret = i2c_master_recv(chip->client, (char *)&tmp, ADS1110_DATA_BYTES); + if (ret < ADS1110_DATA_BYTES) { + dev_err(&chip->client->dev, "I2C read error\n"); + return ret; + } + + *data = be16_to_cpu(tmp); + + return ret; +} + +static ssize_t ads1110_read_frequency(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ads1110_chip_info *st = iio_priv(indio_dev); + u8 cfg; + + mutex_lock(&indio_dev->mlock); + cfg = ((st->config & ADS1110_CYC_MASK) >> ADS1110_CYC_SHIFT); + mutex_unlock(&indio_dev->mlock); + + return sprintf(buf, "%d\n", ads1110_frequencies[cfg]); +} + +static ssize_t ads1110_write_frequency(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ads1110_chip_info *st = iio_priv(indio_dev); + unsigned long lval; + int ret, i; + + mutex_lock(&indio_dev->mlock); + ret = kstrtoul(buf, 10, &lval); + if (ret) + goto out; + + for (i = 0; i < ARRAY_SIZE(ads1110_frequencies); i++) + if (lval == ads1110_frequencies[i]) + break; + + if (i == ARRAY_SIZE(ads1110_frequencies)) { + ret = -EINVAL; + goto out; + } + + st->config &= ~ADS1110_CYC_MASK; + st->config |= (i << ADS1110_CYC_SHIFT); + + ret = i2c_master_send(st->client, &st->config, 1); + if (ret < 0) { + ret = -EIO; + dev_err(&st->client->dev, "I2C write error\n"); + } + +out: + mutex_unlock(&indio_dev->mlock); + return ret < 0 ? ret : len; +} + +static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, + ads1110_read_frequency, + ads1110_write_frequency); + +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("240 60 30 15"); + +static IIO_CONST_ATTR(in_in_scale_available, "1 2 4 8"); + +static int ads1110_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long mask) +{ + struct ads1110_chip_info *st = iio_priv(indio_dev); + int ret, data, gain; + + switch (mask) { + case 0: + mutex_lock(&indio_dev->mlock); + ret = ads1110_i2c_read_data(st, &data); + if (ret != ADS1110_DATA_BYTES) + return -EIO; + + mutex_unlock(&indio_dev->mlock); + + *val = data; + + return IIO_VAL_INT; + + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + + mutex_lock(&indio_dev->mlock); + gain = 1 << (st->config & ADS1110_PGA_MASK); + mutex_unlock(&indio_dev->mlock); + + *val = gain; + + return IIO_VAL_INT; + } + return -EINVAL; +} + +static int ads1110_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ads1110_chip_info *st = iio_priv(indio_dev); + int ret, i; + unsigned int tmp; + + mutex_lock(&indio_dev->mlock); + switch (mask) { + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + ret = -EINVAL; + for (i = 0; i < ADS1110_PGA_COUNT; i++) { + if (val == (1 << i)) { + tmp = st->config; + + st->config &= ~ADS1110_PGA_MASK; + st->config |= i; + + if (tmp != st->config) { + ret = i2c_master_send(st->client, + &st->config, 1); + if (ret < 0) { + ret = -EIO; + dev_err(&st->client->dev, + "I2C write error\n"); + goto out; + } + } + ret = 0; + + break; + } + } + break; + default: + ret = -EINVAL; + } +out: + mutex_unlock(&indio_dev->mlock); + return ret; +} + + +static struct attribute *ads1110_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + &iio_dev_attr_sampling_frequency.dev_attr.attr, + &iio_const_attr_in_in_scale_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ads1110_attribute_group = { + .attrs = ads1110_attributes, +}; + +static const struct iio_info ads1110_info = { + .attrs = &ads1110_attribute_group, + .read_raw = &ads1110_read_raw, + .write_raw = &ads1110_write_raw, + .driver_module = THIS_MODULE, +}; + +static int __devinit ads1110_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret = 0; + struct ads1110_chip_info *chip; + struct iio_dev *indio_dev; + + indio_dev = iio_allocate_device(sizeof(*chip)); + if (indio_dev == NULL) { + ret = -ENOMEM; + goto error_ret; + } + chip = iio_priv(indio_dev); + + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, indio_dev); + + chip->client = client; + + /* Establish that the iio_dev is a child of the i2c device */ + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->info = &ads1110_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = ads1110_channels; + indio_dev->num_channels = ARRAY_SIZE(ads1110_channels); + + ret = iio_device_register(indio_dev); + if (ret) + goto error_free_dev; + + /* read the config register from the chip */ + ret = ads1110_i2c_read_config(chip, &chip->config); + if (ret != ADS1110_CONFIG_BYTES) + goto error_free_dev; + + dev_err(&client->dev, "%s ADC registered.\n", id->name); + + return 0; + +error_free_dev: + iio_free_device(indio_dev); + kfree(chip); +error_ret: + return ret; +} + +static int __devexit ads1110_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + iio_free_device(indio_dev); + + return 0; +} + +static const struct i2c_device_id ads1110_id[] = { + { "ads1110", 0x00 }, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, ads1110_id); + +static struct i2c_driver ads1110_driver = { + .driver = { + .name = "ads1110", + }, + .probe = ads1110_probe, + .remove = __devexit_p(ads1110_remove), + .id_table = ads1110_id, +}; + +static int __init ads1110_init(void) +{ + return i2c_add_driver(&ads1110_driver); +} +module_init(ads1110_init); + +static void __exit ads1110_exit(void) +{ + i2c_del_driver(&ads1110_driver); +} +module_exit(ads1110_exit); + +MODULE_AUTHOR("Duss Pirmin <pirmin.duss@xxxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments ads1110 adc driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
