This is the second iteration of the patch to add the Texas Instruments ADS1110 adc driver. Signed-off-by: Pirmin Duss (Flytec) <pirmin.duss@xxxxxxxxx> --- drivers/staging/iio/adc/Kconfig | 10 + drivers/staging/iio/adc/Makefile | 1 + drivers/staging/iio/adc/ads1110.c | 397 +++++++++++++++++++++++++++++++++++++ 3 files changed, 408 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..ad0d386 --- /dev/null +++ b/drivers/staging/iio/adc/ads1110.c @@ -0,0 +1,397 @@ +/* + * 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/interrupt.h> +#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" + +/* + * ADS1110 definitions + */ + +#define ADS1110_CYC_MASK 0x0C +#define ADS1110_CYC_SHIFT 2 +#define ADS1110_CYC_TCONF_15 3 +#define ADS1110_CYC_TCONF_30 2 +#define ADS1110_CYC_TCONF_60 1 +#define ADS1110_CYC_TCONF_240 0 + +#define ADS1110_PGA_MASK 0x03 +#define ADS1110_PGA_CLEAR 0x9C +#define ADS1110_PGA_1 0 +#define ADS1110_PGA_2 1 +#define ADS1110_PGA_4 2 +#define ADS1110_PGA_8 3 + +#define ADS1110_MAX_CONV_MODE 2 +#define ADS1110_MAX_DATA_RATE 4 +#define ADS1110_MAX_PGA 4 + +/* + * struct ads1110_chip_info - chip specifig information + */ + +struct ads1110_chip_info { + struct i2c_client *client; +}; + +static const unsigned int ads1110_frequencies[] = { + [ADS1110_CYC_TCONF_240] = 240, + [ADS1110_CYC_TCONF_60] = 60, + [ADS1110_CYC_TCONF_30] = 30, + [ADS1110_CYC_TCONF_15] = 15, +}; + +struct ads1110_pga { + char *name; + u8 reg_cfg; +}; + +static struct ads1110_pga +ads1110_pga_table[ADS1110_MAX_PGA] = { + { "gain-1", ADS1110_PGA_1 }, + { "gain-2", ADS1110_PGA_2 }, + { "gain-4", ADS1110_PGA_4 }, + { "gain-8", ADS1110_PGA_8 }, +}; + +/* + * channel specifications + */ + +static const struct iio_chan_spec ads1110_channels[] = { + IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, 0, 0, 0, + IIO_ST('s', 16, 16, 0), 0), +}; + +/* + * cummunication functions for i2c + */ + +static int ads1110_i2c_read_config(struct ads1110_chip_info *chip, u8 *data) +{ + struct i2c_client *client = chip->client; + int ret = 0; + u8 tmp[3]; /* read three bytes ; first two are data third is the config */ + + ret = i2c_master_recv(client, tmp, 3); + if (ret < 3) { + dev_err(&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) +{ + struct i2c_client *client = chip->client; + int ret = 0; + u8 tmp[3]; /* read three bytes ; first two are data third is the config */ + + ret = i2c_master_recv(client, tmp, 3); + if (ret < 3) { + dev_err(&client->dev, "I2C read error\n"); + return ret; + } + + *data = (int)(tmp[0] << 8) + tmp[1]; + + return ret; +} + + +static int ads1110_i2c_write_config(struct ads1110_chip_info *chip, u8 data) +{ + struct i2c_client *client = chip->client; + int ret = 0; + + ret = i2c_master_send(client, &data, 1); /* there is only one register to write to. */ + if (ret < 0) + dev_err(&client->dev, "I2C write error\n"); + + return ret; +} + +/* + * setter- / getter functions for the sysfs nodes. + */ + +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; + + ads1110_i2c_read_config(st, &cfg); + cfg = ((cfg & ADS1110_CYC_MASK) >> ADS1110_CYC_SHIFT); + + 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; + u8 cfg; + + ads1110_i2c_read_config(st, &cfg); + + ret = kstrtoul(buf, 10, &lval); + if (ret) + return ret; + + if (lval < 15 || lval > 240) { + ret = -EINVAL; + 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; + } + + cfg &= ~ADS1110_CYC_MASK; /* erase old datarate */ + cfg |= (i << ADS1110_CYC_SHIFT); + + ads1110_i2c_write_config(st, cfg); + +out: + return ret ? 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 ssize_t ads1110_show_gains(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int i; + int len = 0; + + for (i = 0; i < ADS1110_MAX_PGA; i++) + len += sprintf(buf + len, "%s\n", ads1110_pga_table[i].name); + + return len; +} + +static IIO_DEVICE_ATTR(gains_available, + S_IRUGO, + ads1110_show_gains, NULL, 0); + +static ssize_t ads1110_show_gain(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; + + ads1110_i2c_read_config(st, &cfg); + cfg = (cfg & ADS1110_PGA_MASK); + + return sprintf(buf, "%s\n", ads1110_pga_table[cfg].name); +} + +static ssize_t ads1110_store_gain(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); + u8 cfg; + int i; + + for (i = 0; i < ADS1110_MAX_PGA; i++) { + if (strncmp(buf, ads1110_pga_table[i].name, + strlen(ads1110_pga_table[i].name)) == 0) { + ads1110_i2c_read_config(st, &cfg); + cfg &= ADS1110_PGA_CLEAR; /* clear old value */ + cfg |= ads1110_pga_table[i].reg_cfg; + ads1110_i2c_write_config(st, cfg); + return len; + } + } + + dev_err(dev, "not supported gain\n"); + + return -EINVAL; +} + +static IIO_DEVICE_ATTR(gain, + S_IRUGO | S_IWUSR, + ads1110_show_gain, ads1110_store_gain, 0); + +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; + + ret = ads1110_i2c_read_data(st, &data); + if (ret!=3) + return -EIO; + + *val = data; + *val2 = 0; + + return IIO_VAL_INT; +} + +/* + * attributes for sysfs + */ + +static struct attribute *ads1110_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + &iio_dev_attr_sampling_frequency.dev_attr.attr, + &iio_dev_attr_gains_available.dev_attr.attr, + &iio_dev_attr_gain.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, + .event_attrs = NULL, + .read_raw = &ads1110_read_raw, + .driver_module = THIS_MODULE, +}; + +/* + * device probe and remove + */ + +static int __devinit ads1110_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret = 0, regdone = 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; + regdone = 1; + + dev_err(&client->dev, "%s ADC registered.\n", id->name); + + return 0; + +error_free_dev: + if (regdone) + iio_device_unregister(indio_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-ed0", 0x48 }, + { "ads1110-ed1", 0x49 }, + { "ads1110-ed2", 0x50 }, + { "ads1110-ed3", 0x51 }, + { "ads1110-ed4", 0x52 }, + { "ads1110-ed5", 0x53 }, + { "ads1110-ed6", 0x54 }, + { "ads1110-ed7", 0x55 }, + {} +}; + +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 __init int ads1110_init(void) +{ + return i2c_add_driver(&ads1110_driver); +} + +static __exit void ads1110_exit(void) +{ + i2c_del_driver(&ads1110_driver); +} + +MODULE_AUTHOR("Duss Pirmin <pirmin.duss@xxxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments ads1110 adc driver"); +MODULE_LICENSE("GPL v2"); + +module_init(ads1110_init); +module_exit(ads1110_exit); -- 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
