| /* |
| * AD7152 capacitive sensor driver supporting AD7152/3 |
| * |
| * Copyright 2010 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/gpio.h> |
| #include <linux/workqueue.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 <linux/rtc.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| |
| /* |
| * AD7152 registers definition |
| */ |
| |
| #define AD7152_STATUS 0 |
| #define AD7152_STATUS_RDY1 (1 << 0) |
| #define AD7152_STATUS_RDY2 (1 << 1) |
| #define AD7152_CH1_DATA_HIGH 1 |
| #define AD7152_CH1_DATA_LOW 2 |
| #define AD7152_CH2_DATA_HIGH 3 |
| #define AD7152_CH2_DATA_LOW 4 |
| #define AD7152_CH1_OFFS_HIGH 5 |
| #define AD7152_CH1_OFFS_LOW 6 |
| #define AD7152_CH2_OFFS_HIGH 7 |
| #define AD7152_CH2_OFFS_LOW 8 |
| #define AD7152_CH1_GAIN_HIGH 9 |
| #define AD7152_CH1_GAIN_LOW 10 |
| #define AD7152_CH1_SETUP 11 |
| #define AD7152_CH2_GAIN_HIGH 12 |
| #define AD7152_CH2_GAIN_LOW 13 |
| #define AD7152_CH2_SETUP 14 |
| #define AD7152_CFG 15 |
| #define AD7152_RESEVERD 16 |
| #define AD7152_CAPDAC_POS 17 |
| #define AD7152_CAPDAC_NEG 18 |
| #define AD7152_CFG2 26 |
| |
| #define AD7152_MAX_CONV_MODE 6 |
| |
| /* |
| * struct ad7152_chip_info - chip specifc information |
| */ |
| |
| struct ad7152_chip_info { |
| const char *name; |
| struct i2c_client *client; |
| struct iio_dev *indio_dev; |
| u16 ch1_offset; /* Channel 1 offset calibration coefficient */ |
| u16 ch1_gain; /* Channel 1 gain coefficient */ |
| u8 ch1_setup; |
| u16 ch2_offset; /* Channel 2 offset calibration coefficient */ |
| u16 ch2_gain; /* Channel 1 gain coefficient */ |
| u8 ch2_setup; |
| u8 filter_rate_setup; /* Capacitive channel digital filter setup; conversion time/update rate setup per channel */ |
| char *conversion_mode; |
| }; |
| |
| struct ad7152_conversion_mode { |
| char *name; |
| u8 reg_cfg; |
| }; |
| |
| struct ad7152_conversion_mode ad7152_conv_mode_table[AD7152_MAX_CONV_MODE] = { |
| { "idle", 0 }, |
| { "continuous-conversion", 1 }, |
| { "single-conversion", 2 }, |
| { "power-down", 3 }, |
| { "offset-calibration", 5 }, |
| { "gain-calibration", 6 }, |
| }; |
| |
| /* |
| * ad7152 register access by I2C |
| */ |
| |
| static int ad7152_i2c_read(struct ad7152_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; |
| } |
| |
| static int ad7152_i2c_write(struct ad7152_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_CH1_OFFSET(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(ch1_offset, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CH2_OFFSET(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(ch2_offset, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CH1_GAIN(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(ch1_gain, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CH2_GAIN(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(ch2_gain, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CH1_VALUE(_show) \ |
| IIO_DEVICE_ATTR(ch1_value, S_IRUGO, _show, NULL, 0) |
| #define IIO_DEV_ATTR_CH2_VALUE(_show) \ |
| IIO_DEVICE_ATTR(ch2_value, S_IRUGO, _show, NULL, 0) |
| #define IIO_DEV_ATTR_CH1_SETUP(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(ch1_setup, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_CH2_SETUP(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(ch2_setup, _mode, _show, _store, 0) |
| #define IIO_DEV_ATTR_FILTER_RATE_SETUP(_mode, _show, _store) \ |
| IIO_DEVICE_ATTR(filter_rate_setup, _mode, _show, _store, 0) |
| |
| static ssize_t ad7152_show_conversion_modes(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int i; |
| int len = 0; |
| |
| for (i = 0; i < AD7152_MAX_CONV_MODE; i++) |
| len += sprintf(buf + len, "%s ", ad7152_conv_mode_table[i].name); |
| |
| len += sprintf(buf + len, "\n"); |
| |
| return len; |
| } |
| |
| static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad7152_show_conversion_modes); |
| |
| static ssize_t ad7152_show_ch1_value(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| u8 data[2]; |
| |
| ad7152_i2c_read(chip, AD7152_CH1_DATA_HIGH, data, 2); |
| return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]); |
| } |
| |
| static IIO_DEV_ATTR_CH1_VALUE(ad7152_show_ch1_value); |
| |
| static ssize_t ad7152_show_ch2_value(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| u8 data[2]; |
| |
| ad7152_i2c_read(chip, AD7152_CH2_DATA_HIGH, data, 2); |
| return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]); |
| } |
| |
| static IIO_DEV_ATTR_CH2_VALUE(ad7152_show_ch2_value); |
| |
| static ssize_t ad7152_show_conversion_mode(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%s\n", chip->conversion_mode); |
| } |
| |
| static ssize_t ad7152_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 ad7152_chip_info *chip = dev_info->dev_data; |
| u8 cfg; |
| int i; |
| |
| ad7152_i2c_read(chip, AD7152_CFG, &cfg, 1); |
| |
| for (i = 0; i < AD7152_MAX_CONV_MODE; i++) |
| if (strncmp(buf, ad7152_conv_mode_table[i].name, |
| strlen(ad7152_conv_mode_table[i].name) - 1) == 0) { |
| chip->conversion_mode = ad7152_conv_mode_table[i].name; |
| cfg |= 0x18 | ad7152_conv_mode_table[i].reg_cfg; |
| ad7152_i2c_write(chip, AD7152_CFG, cfg); |
| return len; |
| } |
| |
| dev_err(dev, "not supported conversion mode\n"); |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR, |
| ad7152_show_conversion_mode, |
| ad7152_store_conversion_mode); |
| |
| static ssize_t ad7152_show_ch1_offset(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->ch1_offset); |
| } |
| |
| static ssize_t ad7152_store_ch1_offset(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad7152_i2c_write(chip, AD7152_CH1_OFFS_HIGH, data >> 8); |
| ad7152_i2c_write(chip, AD7152_CH1_OFFS_LOW, data); |
| chip->ch1_offset = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CH1_OFFSET(S_IRUGO | S_IWUSR, |
| ad7152_show_ch1_offset, |
| ad7152_store_ch1_offset); |
| |
| static ssize_t ad7152_show_ch2_offset(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->ch2_offset); |
| } |
| |
| static ssize_t ad7152_store_ch2_offset(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad7152_i2c_write(chip, AD7152_CH2_OFFS_HIGH, data >> 8); |
| ad7152_i2c_write(chip, AD7152_CH2_OFFS_LOW, data); |
| chip->ch2_offset = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CH2_OFFSET(S_IRUGO | S_IWUSR, |
| ad7152_show_ch2_offset, |
| ad7152_store_ch2_offset); |
| |
| static ssize_t ad7152_show_ch1_gain(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->ch1_gain); |
| } |
| |
| static ssize_t ad7152_store_ch1_gain(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad7152_i2c_write(chip, AD7152_CH1_GAIN_HIGH, data >> 8); |
| ad7152_i2c_write(chip, AD7152_CH1_GAIN_LOW, data); |
| chip->ch1_gain = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CH1_GAIN(S_IRUGO | S_IWUSR, |
| ad7152_show_ch1_gain, |
| ad7152_store_ch1_gain); |
| |
| static ssize_t ad7152_show_ch2_gain(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "%d\n", chip->ch2_gain); |
| } |
| |
| static ssize_t ad7152_store_ch2_gain(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x10000)) { |
| ad7152_i2c_write(chip, AD7152_CH2_GAIN_HIGH, data >> 8); |
| ad7152_i2c_write(chip, AD7152_CH2_GAIN_LOW, data); |
| chip->ch2_gain = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CH2_GAIN(S_IRUGO | S_IWUSR, |
| ad7152_show_ch2_gain, |
| ad7152_store_ch2_gain); |
| |
| static ssize_t ad7152_show_ch1_setup(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "0x%02x\n", chip->ch1_setup); |
| } |
| |
| static ssize_t ad7152_store_ch1_setup(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x100)) { |
| ad7152_i2c_write(chip, AD7152_CH1_SETUP, data); |
| chip->ch1_setup = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CH1_SETUP(S_IRUGO | S_IWUSR, |
| ad7152_show_ch1_setup, |
| ad7152_store_ch1_setup); |
| |
| static ssize_t ad7152_show_ch2_setup(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "0x%02x\n", chip->ch2_setup); |
| } |
| |
| static ssize_t ad7152_store_ch2_setup(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x100)) { |
| ad7152_i2c_write(chip, AD7152_CH2_SETUP, data); |
| chip->ch2_setup = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_CH2_SETUP(S_IRUGO | S_IWUSR, |
| ad7152_show_ch2_setup, |
| ad7152_store_ch2_setup); |
| |
| static ssize_t ad7152_show_filter_rate_setup(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| |
| return sprintf(buf, "0x%02x\n", chip->filter_rate_setup); |
| } |
| |
| static ssize_t ad7152_store_filter_rate_setup(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| unsigned long data; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &data); |
| |
| if ((!ret) && (data < 0x100)) { |
| ad7152_i2c_write(chip, AD7152_CFG2, data); |
| chip->filter_rate_setup = data; |
| return len; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static IIO_DEV_ATTR_FILTER_RATE_SETUP(S_IRUGO | S_IWUSR, |
| ad7152_show_filter_rate_setup, |
| ad7152_store_filter_rate_setup); |
| |
| static ssize_t ad7152_show_name(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *dev_info = dev_get_drvdata(dev); |
| struct ad7152_chip_info *chip = dev_info->dev_data; |
| return sprintf(buf, "%s\n", chip->name); |
| } |
| |
| static IIO_DEVICE_ATTR(name, S_IRUGO, ad7152_show_name, NULL, 0); |
| |
| static struct attribute *ad7152_attributes[] = { |
| &iio_dev_attr_available_conversion_modes.dev_attr.attr, |
| &iio_dev_attr_conversion_mode.dev_attr.attr, |
| &iio_dev_attr_ch1_gain.dev_attr.attr, |
| &iio_dev_attr_ch2_gain.dev_attr.attr, |
| &iio_dev_attr_ch1_offset.dev_attr.attr, |
| &iio_dev_attr_ch2_offset.dev_attr.attr, |
| &iio_dev_attr_ch1_value.dev_attr.attr, |
| &iio_dev_attr_ch2_value.dev_attr.attr, |
| &iio_dev_attr_ch1_setup.dev_attr.attr, |
| &iio_dev_attr_ch2_setup.dev_attr.attr, |
| &iio_dev_attr_filter_rate_setup.dev_attr.attr, |
| &iio_dev_attr_name.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ad7152_attribute_group = { |
| .attrs = ad7152_attributes, |
| }; |
| |
| /* |
| * device probe and remove |
| */ |
| |
| static int __devinit ad7152_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| int ret = 0; |
| struct ad7152_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->name = id->name; |
| |
| chip->indio_dev = iio_allocate_device(); |
| if (chip->indio_dev == NULL) { |
| ret = -ENOMEM; |
| goto error_free_chip; |
| } |
| |
| /* Echipabilish that the iio_dev is a child of the i2c device */ |
| chip->indio_dev->dev.parent = &client->dev; |
| chip->indio_dev->attrs = &ad7152_attribute_group; |
| chip->indio_dev->dev_data = (void *)(chip); |
| chip->indio_dev->driver_module = THIS_MODULE; |
| chip->indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| ret = iio_device_register(chip->indio_dev); |
| if (ret) |
| goto error_free_dev; |
| |
| dev_err(&client->dev, "%s capacitive sensor registered\n", id->name); |
| |
| return 0; |
| |
| error_free_dev: |
| iio_free_device(chip->indio_dev); |
| error_free_chip: |
| kfree(chip); |
| error_ret: |
| return ret; |
| } |
| |
| static int __devexit ad7152_remove(struct i2c_client *client) |
| { |
| struct ad7152_chip_info *chip = i2c_get_clientdata(client); |
| struct iio_dev *indio_dev = chip->indio_dev; |
| |
| if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0) |
| iio_unregister_interrupt_line(indio_dev, 0); |
| iio_device_unregister(indio_dev); |
| kfree(chip); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id ad7152_id[] = { |
| { "ad7152", 0 }, |
| { "ad7153", 0 }, |
| {} |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, ad7152_id); |
| |
| static struct i2c_driver ad7152_driver = { |
| .driver = { |
| .name = "ad7152", |
| }, |
| .probe = ad7152_probe, |
| .remove = __devexit_p(ad7152_remove), |
| .id_table = ad7152_id, |
| }; |
| |
| static __init int ad7152_init(void) |
| { |
| return i2c_add_driver(&ad7152_driver); |
| } |
| |
| static __exit void ad7152_exit(void) |
| { |
| i2c_del_driver(&ad7152_driver); |
| } |
| |
| MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| MODULE_DESCRIPTION("Analog Devices ad7152/3 capacitive sensor driver"); |
| MODULE_LICENSE("GPL v2"); |
| |
| module_init(ad7152_init); |
| module_exit(ad7152_exit); |