diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad799x_core.c')
-rw-r--r-- | drivers/staging/iio/adc/ad799x_core.c | 657 |
1 files changed, 0 insertions, 657 deletions
diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c deleted file mode 100644 index 979ec77..0000000 --- a/drivers/staging/iio/adc/ad799x_core.c +++ /dev/null @@ -1,657 +0,0 @@ -/* - * iio/adc/ad799x.c - * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. - * - * based on iio/adc/max1363 - * Copyright (C) 2008-2010 Jonathan Cameron - * - * based on linux/drivers/i2c/chips/max123x - * Copyright (C) 2002-2004 Stefan Eletzhofer - * - * based on linux/drivers/acron/char/pcf8583.c - * Copyright (C) 2000 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * ad799x.c - * - * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, - * ad7998 and similar chips. - * - */ - -#include <linux/interrupt.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/sysfs.h> -#include <linux/i2c.h> -#include <linux/regulator/consumer.h> -#include <linux/slab.h> -#include <linux/types.h> -#include <linux/err.h> -#include <linux/module.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include <linux/iio/events.h> -#include <linux/iio/buffer.h> - -#include "ad799x.h" - -/* - * ad799x register access by I2C - */ -static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data) -{ - struct i2c_client *client = st->client; - int ret = 0; - - ret = i2c_smbus_read_word_swapped(client, reg); - if (ret < 0) { - dev_err(&client->dev, "I2C read error\n"); - return ret; - } - - *data = (u16)ret; - - return 0; -} - -static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data) -{ - struct i2c_client *client = st->client; - int ret = 0; - - ret = i2c_smbus_read_byte_data(client, reg); - if (ret < 0) { - dev_err(&client->dev, "I2C read error\n"); - return ret; - } - - *data = (u8)ret; - - return 0; -} - -static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data) -{ - struct i2c_client *client = st->client; - int ret = 0; - - ret = i2c_smbus_write_word_swapped(client, reg, data); - if (ret < 0) - dev_err(&client->dev, "I2C write error\n"); - - return ret; -} - -static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data) -{ - struct i2c_client *client = st->client; - int ret = 0; - - ret = i2c_smbus_write_byte_data(client, reg, data); - if (ret < 0) - dev_err(&client->dev, "I2C write error\n"); - - return ret; -} - -static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev, - const unsigned long *scan_mask) -{ - struct ad799x_state *st = iio_priv(indio_dev); - - kfree(st->rx_buf); - st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); - if (!st->rx_buf) - return -ENOMEM; - - st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2; - - switch (st->id) { - case ad7997: - case ad7998: - return ad799x_i2c_write16(st, AD7998_CONF_REG, - st->config | (*scan_mask << AD799X_CHANNEL_SHIFT)); - default: - break; - } - - return 0; -} - -static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch) -{ - u16 rxbuf; - u8 cmd; - int ret; - - switch (st->id) { - case ad7991: - case ad7995: - case ad7999: - cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT); - break; - case ad7992: - case ad7993: - case ad7994: - cmd = (1 << ch) << AD799X_CHANNEL_SHIFT; - break; - case ad7997: - case ad7998: - cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE; - break; - default: - return -EINVAL; - } - - ret = ad799x_i2c_read16(st, cmd, &rxbuf); - if (ret < 0) - return ret; - - return rxbuf; -} - -static int ad799x_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - int ret; - struct ad799x_state *st = iio_priv(indio_dev); - - switch (m) { - case IIO_CHAN_INFO_RAW: - mutex_lock(&indio_dev->mlock); - if (iio_buffer_enabled(indio_dev)) - ret = -EBUSY; - else - ret = ad799x_scan_direct(st, chan->scan_index); - mutex_unlock(&indio_dev->mlock); - - if (ret < 0) - return ret; - *val = (ret >> chan->scan_type.shift) & - RES_MASK(chan->scan_type.realbits); - return IIO_VAL_INT; - case IIO_CHAN_INFO_SCALE: - ret = regulator_get_voltage(st->vref); - if (ret < 0) - return ret; - *val = ret / 1000; - *val2 = chan->scan_type.realbits; - return IIO_VAL_FRACTIONAL_LOG2; - } - return -EINVAL; -} -static const unsigned int ad7998_frequencies[] = { - [AD7998_CYC_DIS] = 0, - [AD7998_CYC_TCONF_32] = 15625, - [AD7998_CYC_TCONF_64] = 7812, - [AD7998_CYC_TCONF_128] = 3906, - [AD7998_CYC_TCONF_512] = 976, - [AD7998_CYC_TCONF_1024] = 488, - [AD7998_CYC_TCONF_2048] = 244, -}; -static ssize_t ad799x_read_frequency(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad799x_state *st = iio_priv(indio_dev); - - int ret; - u8 val; - ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val); - if (ret) - return ret; - - val &= AD7998_CYC_MASK; - - return sprintf(buf, "%u\n", ad7998_frequencies[val]); -} - -static ssize_t ad799x_write_frequency(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad799x_state *st = iio_priv(indio_dev); - - long val; - int ret, i; - u8 t; - - ret = kstrtol(buf, 10, &val); - if (ret) - return ret; - - mutex_lock(&indio_dev->mlock); - ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t); - if (ret) - goto error_ret_mutex; - /* Wipe the bits clean */ - t &= ~AD7998_CYC_MASK; - - for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++) - if (val == ad7998_frequencies[i]) - break; - if (i == ARRAY_SIZE(ad7998_frequencies)) { - ret = -EINVAL; - goto error_ret_mutex; - } - t |= i; - ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t); - -error_ret_mutex: - mutex_unlock(&indio_dev->mlock); - - return ret ? ret : len; -} - -static int ad799x_read_event_config(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - enum iio_event_type type, - enum iio_event_direction dir) -{ - return 1; -} - -static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan, - enum iio_event_direction dir, - enum iio_event_info info) -{ - switch (info) { - case IIO_EV_INFO_VALUE: - if (dir == IIO_EV_DIR_FALLING) - return AD7998_DATALOW_REG(chan->channel); - else - return AD7998_DATAHIGH_REG(chan->channel); - case IIO_EV_INFO_HYSTERESIS: - return AD7998_HYST_REG(chan->channel); - default: - return -EINVAL; - } - - return 0; -} - -static int ad799x_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 ad799x_state *st = iio_priv(indio_dev); - - mutex_lock(&indio_dev->mlock); - ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info), - val); - mutex_unlock(&indio_dev->mlock); - - return ret; -} - -static int ad799x_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) -{ - int ret; - struct ad799x_state *st = iio_priv(indio_dev); - u16 valin; - - mutex_lock(&indio_dev->mlock); - ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info), - &valin); - mutex_unlock(&indio_dev->mlock); - if (ret < 0) - return ret; - *val = valin; - - return IIO_VAL_INT; -} - -static irqreturn_t ad799x_event_handler(int irq, void *private) -{ - struct iio_dev *indio_dev = private; - struct ad799x_state *st = iio_priv(private); - u8 status; - int i, ret; - - ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status); - if (ret) - goto done; - - if (!status) - goto done; - - ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR); - - for (i = 0; i < 8; i++) { - if (status & (1 << i)) - iio_push_event(indio_dev, - i & 0x1 ? - IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, - (i >> 1), - IIO_EV_TYPE_THRESH, - IIO_EV_DIR_RISING) : - IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, - (i >> 1), - IIO_EV_TYPE_THRESH, - IIO_EV_DIR_FALLING), - iio_get_time_ns()); - } - -done: - return IRQ_HANDLED; -} - -static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, - ad799x_read_frequency, - ad799x_write_frequency); -static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0"); - -static struct attribute *ad799x_event_attributes[] = { - &iio_dev_attr_sampling_frequency.dev_attr.attr, - &iio_const_attr_sampling_frequency_available.dev_attr.attr, - NULL, -}; - -static struct attribute_group ad799x_event_attrs_group = { - .attrs = ad799x_event_attributes, - .name = "events", -}; - -static const struct iio_info ad7991_info = { - .read_raw = &ad799x_read_raw, - .driver_module = THIS_MODULE, -}; - -static const struct iio_info ad7993_4_7_8_info = { - .read_raw = &ad799x_read_raw, - .event_attrs = &ad799x_event_attrs_group, - .read_event_config = &ad799x_read_event_config, - .read_event_value = &ad799x_read_event_value, - .write_event_value = &ad799x_write_event_value, - .driver_module = THIS_MODULE, - .update_scan_mode = ad7997_8_update_scan_mode, -}; - -static const struct iio_event_spec ad799x_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, - .dir = IIO_EV_DIR_EITHER, - .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS), - }, -}; - -#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \ - .type = IIO_VOLTAGE, \ - .indexed = 1, \ - .channel = (_index), \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ - .scan_index = (_index), \ - .scan_type = { \ - .sign = 'u', \ - .realbits = (_realbits), \ - .storagebits = 16, \ - .shift = 12 - (_realbits), \ - .endianness = IIO_BE, \ - }, \ - .event_spec = _ev_spec, \ - .num_event_specs = _num_ev_spec, \ -} - -#define AD799X_CHANNEL(_index, _realbits) \ - _AD799X_CHANNEL(_index, _realbits, NULL, 0) - -#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \ - _AD799X_CHANNEL(_index, _realbits, ad799x_events, \ - ARRAY_SIZE(ad799x_events)) - -static const struct ad799x_chip_info ad799x_chip_info_tbl[] = { - [ad7991] = { - .channel = { - AD799X_CHANNEL(0, 12), - AD799X_CHANNEL(1, 12), - AD799X_CHANNEL(2, 12), - AD799X_CHANNEL(3, 12), - IIO_CHAN_SOFT_TIMESTAMP(4), - }, - .num_channels = 5, - .info = &ad7991_info, - }, - [ad7995] = { - .channel = { - AD799X_CHANNEL(0, 10), - AD799X_CHANNEL(1, 10), - AD799X_CHANNEL(2, 10), - AD799X_CHANNEL(3, 10), - IIO_CHAN_SOFT_TIMESTAMP(4), - }, - .num_channels = 5, - .info = &ad7991_info, - }, - [ad7999] = { - .channel = { - AD799X_CHANNEL(0, 8), - AD799X_CHANNEL(1, 8), - AD799X_CHANNEL(2, 8), - AD799X_CHANNEL(3, 8), - IIO_CHAN_SOFT_TIMESTAMP(4), - }, - .num_channels = 5, - .info = &ad7991_info, - }, - [ad7992] = { - .channel = { - AD799X_CHANNEL_WITH_EVENTS(0, 12), - AD799X_CHANNEL_WITH_EVENTS(1, 12), - IIO_CHAN_SOFT_TIMESTAMP(3), - }, - .num_channels = 3, - .default_config = AD7998_ALERT_EN, - .info = &ad7993_4_7_8_info, - }, - [ad7993] = { - .channel = { - AD799X_CHANNEL_WITH_EVENTS(0, 10), - AD799X_CHANNEL_WITH_EVENTS(1, 10), - AD799X_CHANNEL_WITH_EVENTS(2, 10), - AD799X_CHANNEL_WITH_EVENTS(3, 10), - IIO_CHAN_SOFT_TIMESTAMP(4), - }, - .num_channels = 5, - .default_config = AD7998_ALERT_EN, - .info = &ad7993_4_7_8_info, - }, - [ad7994] = { - .channel = { - AD799X_CHANNEL_WITH_EVENTS(0, 12), - AD799X_CHANNEL_WITH_EVENTS(1, 12), - AD799X_CHANNEL_WITH_EVENTS(2, 12), - AD799X_CHANNEL_WITH_EVENTS(3, 12), - IIO_CHAN_SOFT_TIMESTAMP(4), - }, - .num_channels = 5, - .default_config = AD7998_ALERT_EN, - .info = &ad7993_4_7_8_info, - }, - [ad7997] = { - .channel = { - AD799X_CHANNEL_WITH_EVENTS(0, 10), - AD799X_CHANNEL_WITH_EVENTS(1, 10), - AD799X_CHANNEL_WITH_EVENTS(2, 10), - AD799X_CHANNEL_WITH_EVENTS(3, 10), - AD799X_CHANNEL(4, 10), - AD799X_CHANNEL(5, 10), - AD799X_CHANNEL(6, 10), - AD799X_CHANNEL(7, 10), - IIO_CHAN_SOFT_TIMESTAMP(8), - }, - .num_channels = 9, - .default_config = AD7998_ALERT_EN, - .info = &ad7993_4_7_8_info, - }, - [ad7998] = { - .channel = { - AD799X_CHANNEL_WITH_EVENTS(0, 12), - AD799X_CHANNEL_WITH_EVENTS(1, 12), - AD799X_CHANNEL_WITH_EVENTS(2, 12), - AD799X_CHANNEL_WITH_EVENTS(3, 12), - AD799X_CHANNEL(4, 12), - AD799X_CHANNEL(5, 12), - AD799X_CHANNEL(6, 12), - AD799X_CHANNEL(7, 12), - IIO_CHAN_SOFT_TIMESTAMP(8), - }, - .num_channels = 9, - .default_config = AD7998_ALERT_EN, - .info = &ad7993_4_7_8_info, - }, -}; - -static int ad799x_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - int ret; - struct ad799x_state *st; - struct iio_dev *indio_dev; - - indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); - if (indio_dev == NULL) - return -ENOMEM; - - st = iio_priv(indio_dev); - /* this is only used for device removal purposes */ - i2c_set_clientdata(client, indio_dev); - - st->id = id->driver_data; - st->chip_info = &ad799x_chip_info_tbl[st->id]; - st->config = st->chip_info->default_config; - - /* TODO: Add pdata options for filtering and bit delay */ - - st->reg = devm_regulator_get(&client->dev, "vcc"); - if (IS_ERR(st->reg)) - return PTR_ERR(st->reg); - ret = regulator_enable(st->reg); - if (ret) - return ret; - st->vref = devm_regulator_get(&client->dev, "vref"); - if (IS_ERR(st->vref)) { - ret = PTR_ERR(st->vref); - goto error_disable_reg; - } - ret = regulator_enable(st->vref); - if (ret) - goto error_disable_reg; - - st->client = client; - - indio_dev->dev.parent = &client->dev; - indio_dev->name = id->name; - indio_dev->info = st->chip_info->info; - - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = st->chip_info->channel; - indio_dev->num_channels = st->chip_info->num_channels; - - ret = ad799x_register_ring_funcs_and_init(indio_dev); - if (ret) - goto error_disable_reg; - - if (client->irq > 0) { - ret = devm_request_threaded_irq(&client->dev, - client->irq, - NULL, - ad799x_event_handler, - IRQF_TRIGGER_FALLING | - IRQF_ONESHOT, - client->name, - indio_dev); - if (ret) - goto error_cleanup_ring; - } - ret = iio_device_register(indio_dev); - if (ret) - goto error_cleanup_ring; - - return 0; - -error_cleanup_ring: - ad799x_ring_cleanup(indio_dev); -error_disable_reg: - if (!IS_ERR(st->vref)) - regulator_disable(st->vref); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); - - return ret; -} - -static int ad799x_remove(struct i2c_client *client) -{ - struct iio_dev *indio_dev = i2c_get_clientdata(client); - struct ad799x_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - - ad799x_ring_cleanup(indio_dev); - if (!IS_ERR(st->vref)) - regulator_disable(st->vref); - if (!IS_ERR(st->reg)) - regulator_disable(st->reg); - kfree(st->rx_buf); - - return 0; -} - -static const struct i2c_device_id ad799x_id[] = { - { "ad7991", ad7991 }, - { "ad7995", ad7995 }, - { "ad7999", ad7999 }, - { "ad7992", ad7992 }, - { "ad7993", ad7993 }, - { "ad7994", ad7994 }, - { "ad7997", ad7997 }, - { "ad7998", ad7998 }, - {} -}; - -MODULE_DEVICE_TABLE(i2c, ad799x_id); - -static struct i2c_driver ad799x_driver = { - .driver = { - .name = "ad799x", - }, - .probe = ad799x_probe, - .remove = ad799x_remove, - .id_table = ad799x_id, -}; -module_i2c_driver(ad799x_driver); - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); -MODULE_DESCRIPTION("Analog Devices AD799x ADC"); -MODULE_LICENSE("GPL v2"); |