| /* |
| * AD774X capacitive sensor driver supporting AD7745/6/7 |
| * |
| * Copyright 2010 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/gpio.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/sysfs.h> |
| #include <linux/list.h> |
| #include <linux/i2c.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| |
| /* |
| * AD774X registers definition |
| */ |
| |
| #define AD774X_STATUS 0 |
| #define AD774X_STATUS_RDY (1 << 2) |
| #define AD774X_STATUS_RDYVT (1 << 1) |
| #define AD774X_STATUS_RDYCAP (1 << 0) |
| #define AD774X_CAP_DATA_HIGH 1 |
| #define AD774X_CAP_DATA_MID 2 |
| #define AD774X_CAP_DATA_LOW 3 |
| #define AD774X_VT_DATA_HIGH 4 |
| #define AD774X_VT_DATA_MID 5 |
| #define AD774X_VT_DATA_LOW 6 |
| #define AD774X_CAP_SETUP 7 |
| #define AD774X_VT_SETUP 8 |
| #define AD774X_EXEC_SETUP 9 |
| #define AD774X_CFG 10 |
| #define AD774X_CAPDACA 11 |
| #define AD774X_CAPDACB 12 |
| #define AD774X_CAPDAC_EN (1 << 7) |
| #define AD774X_CAP_OFFH 13 |
| #define AD774X_CAP_OFFL 14 |
| #define AD774X_CAP_GAINH 15 |
| #define AD774X_CAP_GAINL 16 |
| #define AD774X_VOLT_GAINH 17 |
| #define AD774X_VOLT_GAINL 18 |
| |
| #define AD774X_MAX_CONV_MODE 6 |
| |
| /* |
| * struct ad774x_chip_info - chip specifc information |
| */ |
| |
| struct ad774x_chip_info { |
| struct i2c_client *client; |
| struct iio_dev *indio_dev; |
| bool inter; |
| u16 cap_offs; /* Capacitive offset */ |
| u16 cap_gain; /* Capacitive gain calibration */ |
| u16 volt_gain; /* Voltage gain calibration */ |
| u8 cap_setup; |
| u8 vt_setup; |
| u8 exec_setup; |
| |
| char *conversion_mode; |
| }; |
| |
| struct ad774x_conversion_mode { |
| char *name; |
| u8 reg_cfg; |
| }; |
| |
| static struct ad774x_conversion_mode |
| ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = { |
| { "idle", 0 }, |
| { "continuous-conversion", 1 }, |
| { "single-conversion", 2 }, |
| { "power-down", 3 }, |
| { "offset-calibration", 5 }, |
| { "gain-calibration", 6 }, |
| }; |
| |
| /* |
| * ad774x register access by I2C |
| */ |
| |
| static int ad774x_i2c_read(struct ad774x_chip_info *chip, u8 reg, u8 *data, int len) |
| { |
| struct i2c_client *client = chip->client; |
| int ret; |
| |
| ret = i2c_master_send(client, ®, 1); |
| if (ret < 0) { |
| dev_err(&client->dev, "I2C write error\n"); |
| return ret; |
| } |
| |
| ret = i2c_master_recv(client, data, len); |
| if (ret < 0) { |
| dev_err(&client->dev, "I2C read error\n"); |
| return ret; |
| } |
| |
| return ret; |
| } |
| |
| static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data) |
| { |
| struct i2c_client *client = chip->client; |
| int ret; |
| |
| u8 tx[2] = { |
| reg, |
| data, |
| }; |
| |
| ret = i2c_master_send(client, tx, 2); |
| if (ret < 0) |
| dev_err(&client->dev, "I2C write error\n"); |
| |
| return ret; |
| } |
| |
| /* |
| * sysfs nodes |
| */ |
| |
| #define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \ |
| IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0) |
| #define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(cap_setup, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(in0_setup, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(in0_gain, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(cap_offs, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(cap_gain, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CAP_DATA(_show) \ |
| IIO_DEVICE_ATTR(cap0_raw, S_IRUGO, _show, NULL, 0) |
| #define IIO_DEV_ATTR_VT_DATA(_show) \ |
| IIO_DEVICE_ATTR(in0_raw, S_IRUGO, _show, NULL, 0) |
| |
| static ssize_t ad774x_show_conversion_modes(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int i; |
| int len = 0; |
| |
| for (i = 0; i < AD774X_MAX_CONV_MODE; i++) |
| len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name); |
| |
| len += sprintf(buf + len, "\n"); |
| |
| return len; |
| } |
| |
| static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes); |
| |
| static ssize_t ad774x_show_conversion_mode(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%s\n", chip->conversion_mode); |
| } |
| |
| static ssize_t ad774x_store_conversion_mode(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| u8 cfg; |
| int i; |
| |
| ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1); |
| |
| for (i = 0; i < AD774X_MAX_CONV_MODE; i++) { |
| if (strncmp(buf, ad774x_conv_mode_table[i].name, |
| strlen(ad774x_conv_mode_table[i].name) - 1) == 0) { |
| chip->conversion_mode = ad774x_conv_mode_table[i].name; |
| cfg |= 0x18 | ad774x_conv_mode_table[i].reg_cfg; |
| ad774x_i2c_write(chip, AD774X_CFG, cfg); |
| return len; |
| } |
| } |
| |
| dev_err(dev, "not supported conversion mode\n"); |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR, |
| ad774x_show_conversion_mode, |
| ad774x_store_conversion_mode); |
| |
| static ssize_t ad774x_show_dac_value(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| u8 data; |
| |
| ad774x_i2c_read(chip, this_attr->address, &data, 1); |
| |
| return sprintf(buf, "%02x\n", data & 0x7F); |
| } |
| |
| static ssize_t ad774x_store_dac_value(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if (!ret) { |
| ad774x_i2c_write(chip, this_attr->address, |
| (data ? AD774X_CAPDAC_EN : 0) | (data & 0x7F)); |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEVICE_ATTR(capdac0_raw, S_IRUGO | S_IWUSR, |
| ad774x_show_dac_value, |
| ad774x_store_dac_value, |
| AD774X_CAPDACA); |
| |
| static IIO_DEVICE_ATTR(capdac1_raw, S_IRUGO | S_IWUSR, |
| ad774x_show_dac_value, |
| ad774x_store_dac_value, |
| AD774X_CAPDACB); |
| |
| static ssize_t ad774x_show_cap_setup(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "0x%02x\n", chip->cap_setup); |
| } |
| |
| static ssize_t ad774x_store_cap_setup(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x100)) { |
| ad774x_i2c_write(chip, AD774X_CAP_SETUP, data); |
| chip->cap_setup = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO | S_IWUSR, |
| ad774x_show_cap_setup, |
| ad774x_store_cap_setup); |
| |
| static ssize_t ad774x_show_vt_setup(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "0x%02x\n", chip->vt_setup); |
| } |
| |
| static ssize_t ad774x_store_vt_setup(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x100)) { |
| ad774x_i2c_write(chip, AD774X_VT_SETUP, data); |
| chip->vt_setup = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_VT_SETUP(S_IRUGO | S_IWUSR, |
| ad774x_show_vt_setup, |
| ad774x_store_vt_setup); |
| |
| static ssize_t ad774x_show_exec_setup(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "0x%02x\n", chip->exec_setup); |
| } |
| |
| static ssize_t ad774x_store_exec_setup(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x100)) { |
| ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data); |
| chip->exec_setup = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO | S_IWUSR, |
| ad774x_show_exec_setup, |
| ad774x_store_exec_setup); |
| |
| static ssize_t ad774x_show_volt_gain(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->volt_gain); |
| } |
| |
| static ssize_t ad774x_store_volt_gain(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8); |
| ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data); |
| chip->volt_gain = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO | S_IWUSR, |
| ad774x_show_volt_gain, |
| ad774x_store_volt_gain); |
| |
| static ssize_t ad774x_show_cap_data(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| char tmp[3]; |
| |
| ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3); |
| data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2]; |
| |
| return sprintf(buf, "%ld\n", data); |
| } |
| |
| static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data); |
| |
| static ssize_t ad774x_show_vt_data(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| char tmp[3]; |
| |
| ad774x_i2c_read(chip, AD774X_VT_DATA_HIGH, tmp, 3); |
| data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2]; |
| |
| return sprintf(buf, "%ld\n", data); |
| } |
| |
| static IIO_DEV_ATTR_VT_DATA(ad774x_show_vt_data); |
| |
| static ssize_t ad774x_show_cap_offs(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->cap_offs); |
| } |
| |
| static ssize_t ad774x_store_cap_offs(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad774x_i2c_write(chip, AD774X_CAP_OFFH, data >> 8); |
| ad774x_i2c_write(chip, AD774X_CAP_OFFL, data); |
| chip->cap_offs = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CAP_OFFS(S_IRUGO | S_IWUSR, |
| ad774x_show_cap_offs, |
| ad774x_store_cap_offs); |
| |
| static ssize_t ad774x_show_cap_gain(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->cap_gain); |
| } |
| |
| static ssize_t ad774x_store_cap_gain(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad774x_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad774x_i2c_write(chip, AD774X_CAP_GAINH, data >> 8); |
| ad774x_i2c_write(chip, AD774X_CAP_GAINL, data); |
| chip->cap_gain = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CAP_GAIN(S_IRUGO | S_IWUSR, |
| ad774x_show_cap_gain, |
| ad774x_store_cap_gain); |
| |
| static struct attribute *ad774x_attributes[] = { |
| &iio_dev_attr_available_conversion_modes.dev_attr.attr, |
| &iio_dev_attr_conversion_mode.dev_attr.attr, |
| &iio_dev_attr_cap_setup.dev_attr.attr, |
| &iio_dev_attr_in0_setup.dev_attr.attr, |
| &iio_dev_attr_exec_setup.dev_attr.attr, |
| &iio_dev_attr_cap_offs.dev_attr.attr, |
| &iio_dev_attr_cap_gain.dev_attr.attr, |
| &iio_dev_attr_in0_gain.dev_attr.attr, |
| &iio_dev_attr_in0_raw.dev_attr.attr, |
| &iio_dev_attr_cap0_raw.dev_attr.attr, |
| &iio_dev_attr_capdac0_raw.dev_attr.attr, |
| &iio_dev_attr_capdac1_raw.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ad774x_attribute_group = { |
| .attrs = ad774x_attributes, |
| }; |
| |
| /* |
| * data ready events |
| */ |
| |
| #define IIO_EVENT_CODE_CAP_RDY 0 |
| #define IIO_EVENT_CODE_VT_RDY 1 |
| |
| #define IIO_EVENT_ATTR_CAP_RDY_SH(_evlist, _show, _store, _mask) \ |
| IIO_EVENT_ATTR_SH(cap_rdy, _evlist, _show, _store, _mask) |
| |
| #define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask) \ |
| IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask) |
| |
| static irqreturn_t ad774x_event_handler(int irq, void *private) |
| { |
| struct iio_dev *indio_dev = private; |
| struct ad774x_chip_info *chip = iio_dev_get_devdata(indio_dev); |
| u8 int_status; |
| |
| ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1); |
| |
| if (int_status & AD774X_STATUS_RDYCAP) |
| iio_push_event(indio_dev, 0, |
| IIO_EVENT_CODE_CAP_RDY, |
| iio_get_time_ns()); |
| |
| if (int_status & AD774X_STATUS_RDYVT) |
| iio_push_event(indio_dev, 0, |
| IIO_EVENT_CODE_VT_RDY, |
| iio_get_time_ns()); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static IIO_CONST_ATTR(cap_rdy_en, "1"); |
| static IIO_CONST_ATTR(vt_rdy_en, "1"); |
| |
| static struct attribute *ad774x_event_attributes[] = { |
| &iio_const_attr_cap_rdy_en.dev_attr.attr, |
| &iio_const_attr_vt_rdy_en.dev_attr.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group ad774x_event_attribute_group = { |
| .attrs = ad774x_event_attributes, |
| }; |
| |
| /* |
| * device probe and remove |
| */ |
| |
| static int __devinit ad774x_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| int ret = 0, regdone = 0; |
| struct ad774x_chip_info *chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| if (chip == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| /* this is only used for device removal purposes */ |
| i2c_set_clientdata(client, chip); |
| |
| chip->client = client; |
| |
| chip->indio_dev = iio_allocate_device(0); |
| if (chip->indio_dev == NULL) { |
| ret = -ENOMEM; |
| goto error_free_chip; |
| } |
| |
| /* Establish that the iio_dev is a child of the i2c device */ |
| chip->indio_dev->name = id->name; |
| chip->indio_dev->dev.parent = &client->dev; |
| chip->indio_dev->attrs = &ad774x_attribute_group; |
| chip->indio_dev->event_attrs = &ad774x_event_attribute_group; |
| chip->indio_dev->dev_data = (void *)(chip); |
| chip->indio_dev->driver_module = THIS_MODULE; |
| chip->indio_dev->num_interrupt_lines = 1; |
| chip->indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| ret = iio_device_register(chip->indio_dev); |
| if (ret) |
| goto error_free_dev; |
| regdone = 1; |
| |
| if (client->irq) { |
| ret = request_threaded_irq(client->irq, |
| NULL, |
| &ad774x_event_handler, |
| IRQF_TRIGGER_FALLING, |
| "ad774x", |
| chip->indio_dev); |
| if (ret) |
| goto error_free_dev; |
| } |
| |
| dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq); |
| |
| return 0; |
| |
| error_free_dev: |
| if (regdone) |
| free_irq(client->irq, chip->indio_dev); |
| else |
| iio_free_device(chip->indio_dev); |
| error_free_chip: |
| kfree(chip); |
| error_ret: |
| return ret; |
| } |
| |
| static int __devexit ad774x_remove(struct i2c_client *client) |
| { |
| struct ad774x_chip_info *chip = i2c_get_clientdata(client); |
| struct iio_dev *indio_dev = chip->indio_dev; |
| |
| if (client->irq) |
| free_irq(client->irq, indio_dev); |
| iio_device_unregister(indio_dev); |
| kfree(chip); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id ad774x_id[] = { |
| { "ad7745", 0 }, |
| { "ad7746", 0 }, |
| { "ad7747", 0 }, |
| {} |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, ad774x_id); |
| |
| static struct i2c_driver ad774x_driver = { |
| .driver = { |
| .name = "ad774x", |
| }, |
| .probe = ad774x_probe, |
| .remove = __devexit_p(ad774x_remove), |
| .id_table = ad774x_id, |
| }; |
| |
| static __init int ad774x_init(void) |
| { |
| return i2c_add_driver(&ad774x_driver); |
| } |
| |
| static __exit void ad774x_exit(void) |
| { |
| i2c_del_driver(&ad774x_driver); |
| } |
| |
| MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| MODULE_DESCRIPTION("Analog Devices ad7745/6/7 capacitive sensor driver"); |
| MODULE_LICENSE("GPL v2"); |
| |
| module_init(ad774x_init); |
| module_exit(ad774x_exit); |