diff options
Diffstat (limited to 'drivers/staging/iio/cdc/ad7150.c')
| -rw-r--r-- | drivers/staging/iio/cdc/ad7150.c | 679 |
1 files changed, 679 insertions, 0 deletions
diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c new file mode 100644 index 000000000..a2b7ae332 --- /dev/null +++ b/drivers/staging/iio/cdc/ad7150.c @@ -0,0 +1,679 @@ +/* + * AD7150 capacitive sensor driver supporting AD7150/1/6 + * + * Copyright 2010-2011 Analog Devices Inc. + * + * 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/i2c.h> +#include <linux/module.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> +/* + * AD7150 registers definition + */ + +#define AD7150_STATUS 0 +#define AD7150_STATUS_OUT1 (1 << 3) +#define AD7150_STATUS_OUT2 (1 << 5) +#define AD7150_CH1_DATA_HIGH 1 +#define AD7150_CH2_DATA_HIGH 3 +#define AD7150_CH1_AVG_HIGH 5 +#define AD7150_CH2_AVG_HIGH 7 +#define AD7150_CH1_SENSITIVITY 9 +#define AD7150_CH1_THR_HOLD_H 9 +#define AD7150_CH1_TIMEOUT 10 +#define AD7150_CH1_SETUP 11 +#define AD7150_CH2_SENSITIVITY 12 +#define AD7150_CH2_THR_HOLD_H 12 +#define AD7150_CH2_TIMEOUT 13 +#define AD7150_CH2_SETUP 14 +#define AD7150_CFG 15 +#define AD7150_CFG_FIX (1 << 7) +#define AD7150_PD_TIMER 16 +#define AD7150_CH1_CAPDAC 17 +#define AD7150_CH2_CAPDAC 18 +#define AD7150_SN3 19 +#define AD7150_SN2 20 +#define AD7150_SN1 21 +#define AD7150_SN0 22 +#define AD7150_ID 23 + +/** + * struct ad7150_chip_info - instance specific chip data + * @client: i2c client for this device + * @current_event: device always has one type of event enabled. + * This element stores the event code of the current one. + * @threshold: thresholds for simple capacitance value events + * @thresh_sensitivity: threshold for simple capacitance offset + * from 'average' value. + * @mag_sensitity: threshold for magnitude of capacitance offset from + * from 'average' value. + * @thresh_timeout: a timeout, in samples from the moment an + * adaptive threshold event occurs to when the average + * value jumps to current value. + * @mag_timeout: a timeout, in sample from the moment an + * adaptive magnitude event occurs to when the average + * value jumps to the current value. + * @old_state: store state from previous event, allowing confirmation + * of new condition. + * @conversion_mode: the current conversion mode. + * @state_lock: ensure consistent state of this structure wrt the + * hardware. + */ +struct ad7150_chip_info { + struct i2c_client *client; + u64 current_event; + u16 threshold[2][2]; + u8 thresh_sensitivity[2][2]; + u8 mag_sensitivity[2][2]; + u8 thresh_timeout[2][2]; + u8 mag_timeout[2][2]; + int old_state; + char *conversion_mode; + struct mutex state_lock; +}; + +/* + * sysfs nodes + */ + +static const u8 ad7150_addresses[][6] = { + { AD7150_CH1_DATA_HIGH, AD7150_CH1_AVG_HIGH, + AD7150_CH1_SETUP, AD7150_CH1_THR_HOLD_H, + AD7150_CH1_SENSITIVITY, AD7150_CH1_TIMEOUT }, + { AD7150_CH2_DATA_HIGH, AD7150_CH2_AVG_HIGH, + AD7150_CH2_SETUP, AD7150_CH2_THR_HOLD_H, + AD7150_CH2_SENSITIVITY, AD7150_CH2_TIMEOUT }, +}; + +static int ad7150_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long mask) +{ + int ret; + struct ad7150_chip_info *chip = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = i2c_smbus_read_word_data(chip->client, + ad7150_addresses[chan->channel][0]); + if (ret < 0) + return ret; + *val = swab16(ret); + return IIO_VAL_INT; + case IIO_CHAN_INFO_AVERAGE_RAW: + ret = i2c_smbus_read_word_data(chip->client, + ad7150_addresses[chan->channel][1]); + if (ret < 0) + return ret; + *val = swab16(ret); + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int ad7150_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, enum iio_event_type type, + enum iio_event_direction dir) +{ + int ret; + u8 threshtype; + bool adaptive; + struct ad7150_chip_info *chip = iio_priv(indio_dev); + + ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG); + if (ret < 0) + return ret; + + threshtype = (ret >> 5) & 0x03; + adaptive = !!(ret & 0x80); + + switch (type) { + case IIO_EV_TYPE_MAG_ADAPTIVE: + if (dir == IIO_EV_DIR_RISING) + return adaptive && (threshtype == 0x1); + return adaptive && (threshtype == 0x0); + case IIO_EV_TYPE_THRESH_ADAPTIVE: + if (dir == IIO_EV_DIR_RISING) + return adaptive && (threshtype == 0x3); + return adaptive && (threshtype == 0x2); + case IIO_EV_TYPE_THRESH: + if (dir == IIO_EV_DIR_RISING) + return !adaptive && (threshtype == 0x1); + return !adaptive && (threshtype == 0x0); + default: + break; + } + return -EINVAL; +} + +/* lock should be held */ +static int ad7150_write_event_params(struct iio_dev *indio_dev, + unsigned int chan, enum iio_event_type type, + enum iio_event_direction dir) +{ + int ret; + u16 value; + u8 sens, timeout; + struct ad7150_chip_info *chip = iio_priv(indio_dev); + int rising = (dir == IIO_EV_DIR_RISING); + u64 event_code; + + event_code = IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, chan, type, dir); + + if (event_code != chip->current_event) + return 0; + + switch (type) { + /* Note completely different from the adaptive versions */ + case IIO_EV_TYPE_THRESH: + value = chip->threshold[rising][chan]; + ret = i2c_smbus_write_word_data(chip->client, + ad7150_addresses[chan][3], + swab16(value)); + if (ret < 0) + return ret; + return 0; + case IIO_EV_TYPE_MAG_ADAPTIVE: + sens = chip->mag_sensitivity[rising][chan]; + timeout = chip->mag_timeout[rising][chan]; + break; + case IIO_EV_TYPE_THRESH_ADAPTIVE: + sens = chip->thresh_sensitivity[rising][chan]; + timeout = chip->thresh_timeout[rising][chan]; + break; + default: + return -EINVAL; + } + ret = i2c_smbus_write_byte_data(chip->client, + ad7150_addresses[chan][4], + sens); + if (ret < 0) + return ret; + + ret = i2c_smbus_write_byte_data(chip->client, + ad7150_addresses[chan][5], + timeout); + if (ret < 0) + return ret; + + return 0; +} + +static int ad7150_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, enum iio_event_type type, + enum iio_event_direction dir, int state) +{ + u8 thresh_type, cfg, adaptive; + int ret; + struct ad7150_chip_info *chip = iio_priv(indio_dev); + int rising = (dir == IIO_EV_DIR_RISING); + u64 event_code; + + /* Something must always be turned on */ + if (state == 0) + return -EINVAL; + + event_code = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel, type, dir); + if (event_code == chip->current_event) + return 0; + mutex_lock(&chip->state_lock); + ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG); + if (ret < 0) + goto error_ret; + + cfg = ret & ~((0x03 << 5) | (0x1 << 7)); + + switch (type) { + case IIO_EV_TYPE_MAG_ADAPTIVE: + adaptive = 1; + if (rising) + thresh_type = 0x1; + else + thresh_type = 0x0; + break; + case IIO_EV_TYPE_THRESH_ADAPTIVE: + adaptive = 1; + if (rising) + thresh_type = 0x3; + else + thresh_type = 0x2; + break; + case IIO_EV_TYPE_THRESH: + adaptive = 0; + if (rising) + thresh_type = 0x1; + else + thresh_type = 0x0; + break; + default: + ret = -EINVAL; + goto error_ret; + } + + cfg |= (!adaptive << 7) | (thresh_type << 5); + + ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg); + if (ret < 0) + goto error_ret; + + chip->current_event = event_code; + + /* update control attributes */ + ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir); +error_ret: + mutex_unlock(&chip->state_lock); + + return 0; +} + +static int ad7150_read_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int *val, int *val2) +{ + struct ad7150_chip_info *chip = iio_priv(indio_dev); + int rising = (dir == IIO_EV_DIR_RISING); + + /* Complex register sharing going on here */ + switch (type) { + case IIO_EV_TYPE_MAG_ADAPTIVE: + *val = chip->mag_sensitivity[rising][chan->channel]; + return IIO_VAL_INT; + case IIO_EV_TYPE_THRESH_ADAPTIVE: + *val = chip->thresh_sensitivity[rising][chan->channel]; + return IIO_VAL_INT; + case IIO_EV_TYPE_THRESH: + *val = chip->threshold[rising][chan->channel]; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int ad7150_write_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + int ret; + struct ad7150_chip_info *chip = iio_priv(indio_dev); + int rising = (dir == IIO_EV_DIR_RISING); + + mutex_lock(&chip->state_lock); + switch (type) { + case IIO_EV_TYPE_MAG_ADAPTIVE: + chip->mag_sensitivity[rising][chan->channel] = val; + break; + case IIO_EV_TYPE_THRESH_ADAPTIVE: + chip->thresh_sensitivity[rising][chan->channel] = val; + break; + case IIO_EV_TYPE_THRESH: + chip->threshold[rising][chan->channel] = val; + break; + default: + ret = -EINVAL; + goto error_ret; + } + + /* write back if active */ + ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir); + +error_ret: + mutex_unlock(&chip->state_lock); + return ret; +} + +static ssize_t ad7150_show_timeout(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad7150_chip_info *chip = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + u8 value; + + /* use the event code for consistency reasons */ + int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address); + int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address) + == IIO_EV_DIR_RISING); + + switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) { + case IIO_EV_TYPE_MAG_ADAPTIVE: + value = chip->mag_timeout[rising][chan]; + break; + case IIO_EV_TYPE_THRESH_ADAPTIVE: + value = chip->thresh_timeout[rising][chan]; + break; + default: + return -EINVAL; + } + + return sprintf(buf, "%d\n", value); +} + +static ssize_t ad7150_store_timeout(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad7150_chip_info *chip = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address); + enum iio_event_direction dir; + enum iio_event_type type; + int rising; + u8 data; + int ret; + + type = IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address); + dir = IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address); + rising = (dir == IIO_EV_DIR_RISING); + + ret = kstrtou8(buf, 10, &data); + if (ret < 0) + return ret; + + mutex_lock(&chip->state_lock); + switch (type) { + case IIO_EV_TYPE_MAG_ADAPTIVE: + chip->mag_timeout[rising][chan] = data; + break; + case IIO_EV_TYPE_THRESH_ADAPTIVE: + chip->thresh_timeout[rising][chan] = data; + break; + default: + ret = -EINVAL; + goto error_ret; + } + + ret = ad7150_write_event_params(indio_dev, chan, type, dir); +error_ret: + mutex_unlock(&chip->state_lock); + + if (ret < 0) + return ret; + + return len; +} + +#define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir) \ + IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \ + S_IRUGO | S_IWUSR, \ + &ad7150_show_timeout, \ + &ad7150_store_timeout, \ + IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, \ + chan, \ + IIO_EV_TYPE_##ev_type, \ + IIO_EV_DIR_##ev_dir)) +static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING); +static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING); +static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING); +static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING); +static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING); +static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING); +static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING); +static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING); + +static const struct iio_event_spec ad7150_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, { + .type = IIO_EV_TYPE_THRESH_ADAPTIVE, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, { + .type = IIO_EV_TYPE_THRESH_ADAPTIVE, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, { + .type = IIO_EV_TYPE_MAG_ADAPTIVE, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, { + .type = IIO_EV_TYPE_MAG_ADAPTIVE, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, +}; + +static const struct iio_chan_spec ad7150_channels[] = { + { + .type = IIO_CAPACITANCE, + .indexed = 1, + .channel = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .event_spec = ad7150_events, + .num_event_specs = ARRAY_SIZE(ad7150_events), + }, { + .type = IIO_CAPACITANCE, + .indexed = 1, + .channel = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .event_spec = ad7150_events, + .num_event_specs = ARRAY_SIZE(ad7150_events), + }, +}; + +/* + * threshold events + */ + +static irqreturn_t ad7150_event_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct ad7150_chip_info *chip = iio_priv(indio_dev); + u8 int_status; + s64 timestamp = iio_get_time_ns(); + int ret; + + ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS); + if (ret < 0) + return IRQ_HANDLED; + + int_status = ret; + + if ((int_status & AD7150_STATUS_OUT1) && + !(chip->old_state & AD7150_STATUS_OUT1)) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, + 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + timestamp); + else if ((!(int_status & AD7150_STATUS_OUT1)) && + (chip->old_state & AD7150_STATUS_OUT1)) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, + 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + timestamp); + + if ((int_status & AD7150_STATUS_OUT2) && + !(chip->old_state & AD7150_STATUS_OUT2)) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, + 1, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + timestamp); + else if ((!(int_status & AD7150_STATUS_OUT2)) && + (chip->old_state & AD7150_STATUS_OUT2)) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, + 1, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + timestamp); + /* store the status to avoid repushing same events */ + chip->old_state = int_status; + + return IRQ_HANDLED; +} + +/* Timeouts not currently handled by core */ +static struct attribute *ad7150_event_attributes[] = { + &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout + .dev_attr.attr, + &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout + .dev_attr.attr, + NULL, +}; + +static struct attribute_group ad7150_event_attribute_group = { + .attrs = ad7150_event_attributes, + .name = "events", +}; + +static const struct iio_info ad7150_info = { + .event_attrs = &ad7150_event_attribute_group, + .driver_module = THIS_MODULE, + .read_raw = &ad7150_read_raw, + .read_event_config = &ad7150_read_event_config, + .write_event_config = &ad7150_write_event_config, + .read_event_value = &ad7150_read_event_value, + .write_event_value = &ad7150_write_event_value, +}; + +/* + * device probe and remove + */ + +static int ad7150_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct ad7150_chip_info *chip; + struct iio_dev *indio_dev; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); + if (!indio_dev) + return -ENOMEM; + chip = iio_priv(indio_dev); + mutex_init(&chip->state_lock); + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, indio_dev); + + chip->client = client; + + indio_dev->name = id->name; + indio_dev->channels = ad7150_channels; + indio_dev->num_channels = ARRAY_SIZE(ad7150_channels); + /* Establish that the iio_dev is a child of the i2c device */ + indio_dev->dev.parent = &client->dev; + + indio_dev->info = &ad7150_info; + + indio_dev->modes = INDIO_DIRECT_MODE; + + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, + &ad7150_event_handler, + IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + "ad7150_irq1", + indio_dev); + if (ret) + return ret; + } + + if (client->dev.platform_data) { + ret = devm_request_threaded_irq(&client->dev, *(unsigned int *) + client->dev.platform_data, + NULL, + &ad7150_event_handler, + IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + "ad7150_irq2", + indio_dev); + if (ret) + return ret; + } + + ret = iio_device_register(indio_dev); + if (ret) + return ret; + + dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n", + id->name, client->irq); + + return 0; +} + +static int ad7150_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + + return 0; +} + +static const struct i2c_device_id ad7150_id[] = { + { "ad7150", 0 }, + { "ad7151", 0 }, + { "ad7156", 0 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, ad7150_id); + +static struct i2c_driver ad7150_driver = { + .driver = { + .name = "ad7150", + }, + .probe = ad7150_probe, + .remove = ad7150_remove, + .id_table = ad7150_id, +}; +module_i2c_driver(ad7150_driver); + +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver"); +MODULE_LICENSE("GPL v2"); |