/drivers/staging/iio/adc/ad7745.c
https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t · C · 674 lines · 520 code · 127 blank · 27 comment · 29 complexity · 117b6c4faa65523bfb7c8bdbfb680102 MD5 · raw file
- /*
- * 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;
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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 = iio_priv(dev_info);
- 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_priv(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,
- };
- static const struct iio_info ad774x_info = {
- .attrs = &ad774x_event_attribute_group,
- .event_attrs = &ad774x_event_attribute_group,
- .num_interrupt_lines = 1,
- .driver_module = THIS_MODULE,
- };
- /*
- * 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;
- 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 = &ad774x_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- ret = iio_device_register(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",
- 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, indio_dev);
- else
- iio_free_device(indio_dev);
- error_ret:
- return ret;
- }
- static int __devexit ad774x_remove(struct i2c_client *client)
- {
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
- if (client->irq)
- free_irq(client->irq, indio_dev);
- iio_device_unregister(indio_dev);
- 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);