[RFC] Add support for Analog Devices: ad7991, ad7995, ad7999, ad7992,
ad7993, ad7994, ad7997, ad7998 i2c analog to digital converters (ADC)
Comments appreciated
-Michael
---
drivers/staging/iio/adc/Kconfig | 20 +
drivers/staging/iio/adc/Makefile | 4 +
drivers/staging/iio/adc/ad799x.h | 152 ++++++
drivers/staging/iio/adc/ad799x_core.c | 924
+++++++++++++++++++++++++++++++++
drivers/staging/iio/adc/ad799x_ring.c | 282 ++++++++++
5 files changed, 1382 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/iio/adc/ad799x.h
create mode 100644 drivers/staging/iio/adc/ad799x_core.c
create mode 100644 drivers/staging/iio/adc/ad799x_ring.c
diff --git a/drivers/staging/iio/adc/Kconfig
b/drivers/staging/iio/adc/Kconfig
index 3989c0c..36271ff 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -21,3 +21,23 @@ config MAX1363_RING_BUFFER
help
Say yes here to include ring buffer support in the MAX1363
ADC driver.
+
+config AD799X
+ tristate "Analog Devices AD799x ADC driver"
+ depends on I2C
+ select IIO_TRIGGER if IIO_RING_BUFFER
+ select AD799X_RING_BUFFER
+ help
+ Say yes here to build support for Analog Devices:
+ ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, ad7998
+ i2c analog to digital convertors (ADC). Provides direct
access
+ via sysfs.
+
+config AD799X_RING_BUFFER
+ bool "Analog Devices AD799x: use ring buffer"
+ depends on AD799X
+ select IIO_RING_BUFFER
+ select IIO_SW_RING
+ help
+ Say yes here to include ring buffer support in the AD799X
+ ADC driver.
diff --git a/drivers/staging/iio/adc/Makefile
b/drivers/staging/iio/adc/Makefile
index 08cee5c..7fb4eb4 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -5,4 +5,8 @@
max1363-y := max1363_core.o
max1363-$(CONFIG_MAX1363_RING_BUFFER) += max1363_ring.o
+ad799x-y := ad799x_core.o
+ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o
+
obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_AD799X) += ad799x.o
diff --git a/drivers/staging/iio/adc/ad799x.h
b/drivers/staging/iio/adc/ad799x.h
new file mode 100644
index 0000000..2ff73d5
--- /dev/null
+++ b/drivers/staging/iio/adc/ad799x.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
+ * Copyright (C) 2008-2010 Jonathan Cameron
+ *
+ * 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.h
+ */
+
+#ifndef _AD799X_H_
+#define _AD799X_H_
+
+#define AD7991_REF_SEL 0x08
+#define AD7991_FLTR 0x04
+#define AD7991_BIT_TRIAL_DELAY 0x02
+#define AD7991_SAMPLE_DELAY 0x01
+#define AD799X_CHANNEL_SHIFT 4
+
+#define AD7997_8_READ_SINGLE 0x80
+#define AD7997_8_READ_SEQUENCE 0x70
+
+#define AD799X_FLTR 0x08
+#define AD799X_ALERT_EN 0x04
+#define AD799X_BUSY_ALERT 0x02
+#define AD799X_BUSY_ALERT_POL 0x01
+
+#define AD799X_CONV_RES_REG 0x0
+#define AD799X_ALERT_STAT_REG 0x1
+#define AD799X_CONF_REG 0x2
+#define AD799X_CYCLE_TMR_REG 0x3
+#define AD799X_DATALOW_CH1_REG 0x4
+#define AD799X_DATAHIGH_CH1_REG 0x5
+#define AD799X_HYST_CH1_REG 0x6
+#define AD799X_DATALOW_CH2_REG 0x7
+#define AD799X_DATAHIGH_CH2_REG 0x8
+#define AD799X_HYST_CH2_REG 0x9
+#define AD799X_DATALOW_CH3_REG 0xA
+#define AD799X_DATAHIGH_CH3_REG 0xB
+#define AD799X_HYST_CH3_REG 0xC
+#define AD799X_DATALOW_CH4_REG 0xD
+#define AD799X_DATAHIGH_CH4_REG 0xE
+#define AD799X_HYST_CH4_REG 0xF
+
+#define AD799X_CYC_MASK 0x7
+#define AD799X_CYC_DIS 0x0
+#define AD799X_CYC_TCONF_32 0x1
+#define AD799X_CYC_TCONF_64 0x2
+#define AD799X_CYC_TCONF_128 0x3
+#define AD799X_CYC_TCONF_256 0x4
+#define AD799X_CYC_TCONF_512 0x5
+#define AD799X_CYC_TCONF_1024 0x6
+#define AD799X_CYC_TCONF_2048 0x7
+
+#define AD799X_ALERT_STAT_CLEAR 0xFF
+
+enum {
+ ad7991,
+ ad7995,
+ ad7999,
+ ad7992,
+ ad7993,
+ ad7994,
+ ad7997,
+ ad7998
+};
+
+struct ad799x_state;
+
+/**
+ * struct ad799x_chip_info - chip specifc information
+ * @num_inputs: number of physical inputs on chip
+ * @bits: accuracy of the adc in bits
+ * @int_vref_mv: the internal reference voltage
+ * @monitor_mode: whether the chip supports monitor interrupts
+ * @default_config: device default configuration
+ * @dev_attrs: pointer to the device attribute group
+ * @scan_attrs: pointer to the scan element attribute group
+ * @event_attrs: pointer to the monitor event attribute group
+ * @ad799x_set_scan_mode: function pointer to the device specific mode
function
+
+ */
+struct ad799x_chip_info {
+ u8 num_inputs;
+ u8 bits;
+ u16 int_vref_mv;
+ bool monitor_mode;
+ u16 default_config;
+ struct attribute_group *dev_attrs;
+ struct attribute_group *scan_attrs;
+ struct attribute_group *event_attrs;
+ int (*ad799x_set_scan_mode) (struct ad799x_state *st, unsigned mask);
+};
+
+struct ad799x_state {
+ struct iio_dev *indio_dev;
+ struct i2c_client *client;
+ const struct ad799x_chip_info *chip_info;
+ struct work_struct poll_work;
+ struct work_struct work_thresh;
+ atomic_t protect_ring;
+ struct iio_trigger *trig;
+ struct regulator *reg;
+ s64 last_timestamp;
+ u16 int_vref_mv;
+ unsigned id;
+ char *name;
+ u16 config;
+};
+
+struct ad799x_platform_data {
+ u16 vref_mv;
+};
+
+int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask);
+
+#ifdef CONFIG_AD799X_RING_BUFFER
+
+int ad799x_single_channel_from_ring(struct ad799x_state *st, long
mask);
+int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+void ad799x_ring_cleanup(struct iio_dev *indio_dev);
+
+int ad799x_initialize_ring(struct iio_ring_buffer *ring);
+void ad799x_uninitialize_ring(struct iio_ring_buffer *ring);
+
+#else /* CONFIG_AD799X_RING_BUFFER */
+
+static inline void ad799x_uninitialize_ring(struct iio_ring_buffer
*ring)
+{
+};
+
+static inline int ad799x_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return 0;
+};
+
+int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
+{
+ return -EINVAL;
+};
+
+
+static inline int
+ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+ return 0;
+};
+
+static inline void ad799x_ring_cleanup(struct iio_dev *indio_dev) {};
+#endif /* CONFIG_AD799X_RING_BUFFER */
+#endif /* _AD799X_H_ */
diff --git a/drivers/staging/iio/adc/ad799x_core.c
b/drivers/staging/iio/adc/ad799x_core.c
new file mode 100644
index 0000000..a0a0b1f
--- /dev/null
+++ b/drivers/staging/iio/adc/ad799x_core.c
@@ -0,0 +1,924 @@
+ /*
+ * iio/adc/ad799x.c
+ * Copyright (C) 2010 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 ad799x and similar chips.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/rtc.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+#include "../ring_generic.h"
+#include "adc.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_data(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ *data = swab16((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_word_data(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ *data = 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_data(client, reg, swab16(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 ad799x_scan_el_set_state(struct iio_scan_el *scan_el,
+ struct iio_dev *indio_dev,
+ bool state)
+{
+ struct ad799x_state *st = indio_dev->dev_data;
+ return ad799x_set_scan_mode(st, st->indio_dev->scan_mask);
+}
+
+/* Here we claim all are 16 bits. This currently does no harm and saves
+ * us a lot of scan element listings */
+
+#define AD799X_SCAN_EL(number) \
+ IIO_SCAN_EL_C(in##number, number, IIO_UNSIGNED(16), 0,
ad799x_scan_el_set_state);
+
+static AD799X_SCAN_EL(0);
+static AD799X_SCAN_EL(1);
+static AD799X_SCAN_EL(2);
+static AD799X_SCAN_EL(3);
+static AD799X_SCAN_EL(4);
+static AD799X_SCAN_EL(5);
+static AD799X_SCAN_EL(6);
+static AD799X_SCAN_EL(7);
+
+static ssize_t ad799x_show_precision(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ return sprintf(buf, "%d\n", st->chip_info->bits);
+}
+
+static IIO_DEVICE_ATTR(in_precision, S_IRUGO, ad799x_show_precision,
+ NULL, 0);
+
+int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ return i2c_smbus_write_byte(st->client,
+ st->config | (mask << AD799X_CHANNEL_SHIFT));
+}
+
+int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+
+ return ad799x_i2c_write8(st, AD799X_CONF_REG,
+ st->config | (mask << 4));
+}
+
+int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ return ad799x_i2c_write16(st, AD799X_CONF_REG,
+ st->config | (mask << 4));
+}
+
+int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ int ret;
+
+ if (st->chip_info->ad799x_set_scan_mode != NULL) {
+ ret = st->chip_info->ad799x_set_scan_mode(st, mask);
+ return (ret > 0) ? 0 : ret;
+ }
+
+ return 0;
+}
+
+static ssize_t ad799x_read_single_channel(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret = 0, len = 0;
+ u32 data ;
+ u16 rxbuf[1];
+ u8 cmd;
+ long mask;
+
+ mutex_lock(&dev_info->mlock);
+ mask = 1 << this_attr->address;
+ /* If ring buffer capture is occuring, query the buffer */
+ if (iio_ring_enabled(dev_info)) {
+ data = ad799x_single_channel_from_ring(st, mask);
+ if (data < 0) {
+ ret = data;
+ goto error_ret;
+ }
+ } else {
+ switch (st->id) {
+ case ad7991:
+ case ad7995:
+ case ad7999:
+ cmd = st->config |
+ (mask << AD799X_CHANNEL_SHIFT);
+ break;
+ case ad7992:
+ case ad7993:
+ case ad7994:
+ cmd = mask << AD799X_CHANNEL_SHIFT;
+ break;
+ case ad7997:
+ case ad7998:
+ cmd = (this_attr->address <<
+ AD799X_CHANNEL_SHIFT) |
+ AD7997_8_READ_SINGLE;
+ break;
+ default:
+ cmd = 0;
+
+ }
+ ret = ad799x_i2c_read16(st, cmd, rxbuf);
+ if (ret < 0)
+ goto error_ret;
+
+ data = rxbuf[0] & 0xFFF;
+ }
+
+ /* Pretty print the result */
+ len = sprintf(buf, "%u\n", data);
+
+error_ret:
+ mutex_unlock(&dev_info->mlock);
+ return ret ? ret : len;
+}
+
+static ssize_t ad799x_read_frequency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+
+ int ret, len = 0;
+ u8 val;
+ ret = ad799x_i2c_read8(st, AD799X_CYCLE_TMR_REG, &val);
+ if (ret)
+ return ret;
+
+ val &= AD799X_CYC_MASK;
+
+ switch (val) {
+ case AD799X_CYC_DIS:
+ len = sprintf(buf, "0\n");
+ break;
+ case AD799X_CYC_TCONF_32:
+ len = sprintf(buf, "15625\n");
+ break;
+ case AD799X_CYC_TCONF_64:
+ len = sprintf(buf, "7812\n");
+ break;
+ case AD799X_CYC_TCONF_128:
+ len = sprintf(buf, "3906\n");
+ break;
+ case AD799X_CYC_TCONF_256:
+ len = sprintf(buf, "1953\n");
+ break;
+ case AD799X_CYC_TCONF_512:
+ len = sprintf(buf, "976\n");
+ break;
+ case AD799X_CYC_TCONF_1024:
+ len = sprintf(buf, "488\n");
+ break;
+ case AD799X_CYC_TCONF_2048:
+ len = sprintf(buf, "244\n");
+ break;
+ }
+ return len;
+}
+
+static ssize_t ad799x_write_frequency(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+
+ long val;
+ int ret;
+ u8 t;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev_info->mlock);
+ ret = ad799x_i2c_read8(st, AD799X_CYCLE_TMR_REG, &t);
+ if (ret)
+ goto error_ret_mutex;
+ /* Wipe the bits clean */
+ t &= ~AD799X_CYC_MASK;
+
+ switch (val) {
+ case 15625:
+ t |= AD799X_CYC_TCONF_32;
+ break;
+ case 7812:
+ t |= AD799X_CYC_TCONF_64;
+ break;
+ case 3906:
+ t |= AD799X_CYC_TCONF_128;
+ break;
+ case 1953:
+ t |= AD799X_CYC_TCONF_256;
+ break;
+ case 976:
+ t |= AD799X_CYC_TCONF_512;
+ break;
+ case 488:
+ t |= AD799X_CYC_TCONF_1024;
+ break;
+ case 244:
+ t |= AD799X_CYC_TCONF_2048;
+ break;
+ case 0:
+ t |= AD799X_CYC_DIS;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_ret_mutex;
+ };
+
+ ret = ad799x_i2c_write8(st, AD799X_CYCLE_TMR_REG, t);
+
+
+error_ret_mutex:
+ mutex_unlock(&dev_info->mlock);
+
+ return ret ? ret : len;
+}
+
+
+static ssize_t ad799x_read_channel_config(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_event_attr *this_attr = to_iio_event_attr(attr);
+
+ int ret;
+ u16 val;
+ ret = ad799x_i2c_read16(st, this_attr->mask, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t ad799x_write_channel_config(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_event_attr *this_attr = to_iio_event_attr(attr);
+
+ long val;
+ int ret;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev_info->mlock);
+ ret = ad799x_i2c_write16(st, this_attr->mask, val);
+ mutex_unlock(&dev_info->mlock);
+
+ return ret ? ret : len;
+}
+
+#define IIO_EVENT_CODE_AD799X_IN0_LOW (IIO_EVENT_CODE_DEVICE_SPECIFIC +
0)
+#define IIO_EVENT_CODE_AD799X_IN0_HIGH (IIO_EVENT_CODE_DEVICE_SPECIFIC
+ 1)
+#define IIO_EVENT_CODE_AD799X_IN1_LOW (IIO_EVENT_CODE_DEVICE_SPECIFIC +
2)
+#define IIO_EVENT_CODE_AD799X_IN1_HIGH (IIO_EVENT_CODE_DEVICE_SPECIFIC
+ 3)
+#define IIO_EVENT_CODE_AD799X_IN2_LOW (IIO_EVENT_CODE_DEVICE_SPECIFIC +
4)
+#define IIO_EVENT_CODE_AD799X_IN2_HIGH (IIO_EVENT_CODE_DEVICE_SPECIFIC
+ 5)
+#define IIO_EVENT_CODE_AD799X_IN3_LOW (IIO_EVENT_CODE_DEVICE_SPECIFIC +
6)
+#define IIO_EVENT_CODE_AD799X_IN3_HIGH (IIO_EVENT_CODE_DEVICE_SPECIFIC
+ 7)
+
+static void ad799x_interrupt_bh(struct work_struct *work_s)
+{
+ struct ad799x_state *st = container_of(work_s,
+ struct ad799x_state, work_thresh);
+ u8 status;
+ int i;
+
+ if (ad799x_i2c_read8(st, AD799X_ALERT_STAT_REG, &status))
+ goto err_out;
+
+ if (!status)
+ goto err_out;
+
+ ad799x_i2c_write8(st, AD799X_ALERT_STAT_REG, AD799X_ALERT_STAT_CLEAR);
+
+ for (i = 0; i < 8; i++) {
+ if (status & (1 << i))
+ iio_push_event(st->indio_dev, 0,
+ IIO_EVENT_CODE_AD799X_IN0_LOW + i,
+ st->last_timestamp);
+ }
+
+err_out:
+ enable_irq(st->client->irq);
+}
+
+static int ad799x_interrupt(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct ad799x_state *st = dev_info->dev_data;
+
+ st->last_timestamp = timestamp;
+ schedule_work(&st->work_thresh);
+ return 0;
+}
+
+IIO_EVENT_SH(ad799x, &ad799x_interrupt);
+
+/* Direct read attribtues */
+static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
+static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
+static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
+static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
+static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
+static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
+static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
+static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
+
+static ssize_t ad799x_show_scale(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ /* Driver currently only support internal vref */
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ /* Corresponds to Vref / 2^(bits) */
+
+ if ((1 << (st->chip_info->bits + 1))
+ > st->int_vref_mv)
+ return sprintf(buf, "0.5\n");
+ else
+ return sprintf(buf, "%d\n",
+ st->int_vref_mv >> st->chip_info->bits);
+}
+
+static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
+
+static ssize_t ad799x_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ return sprintf(buf, "%s\n", st->client->name);
+}
+
+static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
+
+
+static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_dev_attr_in2_raw.dev_attr.attr,
+ &iio_dev_attr_in3_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_in_scale.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
+ .attrs = ad7991_5_9_3_4_device_attrs,
+};
+
+static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_scan_el_in1.dev_attr.attr,
+ &iio_scan_el_in2.dev_attr.attr,
+ &iio_scan_el_in3.dev_attr.attr,
+ &iio_dev_attr_in_precision.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
+ .name = "scan_elements",
+ .attrs = ad7991_5_9_3_4_scan_el_attrs,
+};
+
+static struct attribute *ad7992_device_attrs[] = {
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_in_scale.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group ad7992_dev_attr_group = {
+ .attrs = ad7992_device_attrs,
+};
+
+static struct attribute *ad7992_scan_el_attrs[] = {
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_scan_el_in1.dev_attr.attr,
+ &iio_dev_attr_in_precision.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7992_scan_el_group = {
+ .name = "scan_elements",
+ .attrs = ad7992_scan_el_attrs,
+};
+
+static struct attribute *ad7997_8_device_attrs[] = {
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_dev_attr_in2_raw.dev_attr.attr,
+ &iio_dev_attr_in3_raw.dev_attr.attr,
+ &iio_dev_attr_in4_raw.dev_attr.attr,
+ &iio_dev_attr_in5_raw.dev_attr.attr,
+ &iio_dev_attr_in6_raw.dev_attr.attr,
+ &iio_dev_attr_in7_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_in_scale.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group ad7997_8_dev_attr_group = {
+ .attrs = ad7997_8_device_attrs,
+};
+
+static struct attribute *ad7997_8_scan_el_attrs[] = {
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_scan_el_in1.dev_attr.attr,
+ &iio_scan_el_in2.dev_attr.attr,
+ &iio_scan_el_in3.dev_attr.attr,
+ &iio_scan_el_in4.dev_attr.attr,
+ &iio_scan_el_in5.dev_attr.attr,
+ &iio_scan_el_in6.dev_attr.attr,
+ &iio_scan_el_in7.dev_attr.attr,
+ &iio_dev_attr_in_precision.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7997_8_scan_el_group = {
+ .name = "scan_elements",
+ .attrs = ad7997_8_scan_el_attrs,
+};
+
+IIO_EVENT_ATTR_SH(in0_alert_limit_low,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATALOW_CH1_REG);
+
+IIO_EVENT_ATTR_SH(in0_alert_limit_high,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATAHIGH_CH1_REG);
+
+IIO_EVENT_ATTR_SH(in0_alert_limit_hyst,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_HYST_CH1_REG);
+
+IIO_EVENT_ATTR_SH(in1_alert_limit_low,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATALOW_CH2_REG);
+
+IIO_EVENT_ATTR_SH(in1_alert_limit_high,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATAHIGH_CH2_REG);
+
+IIO_EVENT_ATTR_SH(in1_alert_limit_hyst,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_HYST_CH2_REG);
+
+IIO_EVENT_ATTR_SH(in2_alert_limit_low,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATALOW_CH3_REG);
+
+IIO_EVENT_ATTR_SH(in2_alert_limit_high,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATAHIGH_CH3_REG);
+
+IIO_EVENT_ATTR_SH(in2_alert_limit_hyst,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_HYST_CH3_REG);
+
+IIO_EVENT_ATTR_SH(in3_alert_limit_low,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATALOW_CH4_REG);
+
+IIO_EVENT_ATTR_SH(in3_alert_limit_high,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_DATAHIGH_CH4_REG);
+
+IIO_EVENT_ATTR_SH(in3_alert_limit_hyst,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD799X_HYST_CH4_REG);
+
+IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
+ ad799x_read_frequency,
+ ad799x_write_frequency);
+IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
+
+static struct attribute *ad7993_4_7_8_event_attributes[] = {
+ &iio_event_attr_in0_alert_limit_low.dev_attr.attr,
+ &iio_event_attr_in0_alert_limit_high.dev_attr.attr,
+ &iio_event_attr_in0_alert_limit_hyst.dev_attr.attr,
+ &iio_event_attr_in1_alert_limit_low.dev_attr.attr,
+ &iio_event_attr_in1_alert_limit_high.dev_attr.attr,
+ &iio_event_attr_in1_alert_limit_hyst.dev_attr.attr,
+ &iio_event_attr_in2_alert_limit_low.dev_attr.attr,
+ &iio_event_attr_in2_alert_limit_high.dev_attr.attr,
+ &iio_event_attr_in2_alert_limit_hyst.dev_attr.attr,
+ &iio_event_attr_in3_alert_limit_low.dev_attr.attr,
+ &iio_event_attr_in3_alert_limit_high.dev_attr.attr,
+ &iio_event_attr_in3_alert_limit_hyst.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7993_4_7_8_event_attrs_group = {
+ .attrs = ad7993_4_7_8_event_attributes,
+};
+
+static struct attribute *ad7992_event_attributes[] = {
+ &iio_event_attr_in0_alert_limit_low.dev_attr.attr,
+ &iio_event_attr_in0_alert_limit_high.dev_attr.attr,
+ &iio_event_attr_in0_alert_limit_hyst.dev_attr.attr,
+ &iio_event_attr_in1_alert_limit_low.dev_attr.attr,
+ &iio_event_attr_in1_alert_limit_high.dev_attr.attr,
+ &iio_event_attr_in1_alert_limit_hyst.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7992_event_attrs_group = {
+ .attrs = ad7992_event_attributes,
+};
+
+
+/* ad799x and max1368 tested - rest from data sheet */
+static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
+ [ad7991] = {
+ .num_inputs = 4,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .ad799x_set_scan_mode = (void*) ad7991_5_9_set_scan_mode,
+ },
+ [ad7995] = {
+ .num_inputs = 4,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .ad799x_set_scan_mode = (void*) ad7991_5_9_set_scan_mode,
+ },
+ [ad7999] = {
+ .num_inputs = 4,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .ad799x_set_scan_mode = (void*) ad7991_5_9_set_scan_mode,
+ },
+ [ad7992] = {
+ .num_inputs = 2,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .monitor_mode = true,
+ .default_config = AD799X_ALERT_EN,
+ .dev_attrs = &ad7992_dev_attr_group,
+ .scan_attrs = &ad7992_scan_el_group,
+ .event_attrs = &ad7992_event_attrs_group,
+ .ad799x_set_scan_mode = (void*) ad7992_3_4_set_scan_mode,
+ },
+ [ad7993] = {
+ .num_inputs = 4,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .monitor_mode = true,
+ .default_config = AD799X_ALERT_EN,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = (void*) ad7992_3_4_set_scan_mode,
+ },
+ [ad7994] = {
+ .num_inputs = 4,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .monitor_mode = true,
+ .default_config = AD799X_ALERT_EN,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = (void*) ad7992_3_4_set_scan_mode,
+ },
+ [ad7997] = {
+ .num_inputs = 8,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .monitor_mode = true,
+ .default_config = AD799X_ALERT_EN,
+ .dev_attrs = &ad7997_8_dev_attr_group,
+ .scan_attrs = &ad7997_8_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = (void*) ad7997_8_set_scan_mode,
+ },
+ [ad7998] = {
+ .num_inputs = 8,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .monitor_mode = true,
+ .default_config = AD799X_ALERT_EN,
+ .dev_attrs = &ad7997_8_dev_attr_group,
+ .scan_attrs = &ad7997_8_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = (void*) ad7997_8_set_scan_mode,
+ },
+};
+
+static int ad799x_initial_setup(struct ad799x_state *st)
+{
+ st->config = st->chip_info->default_config;
+
+ return ad799x_set_scan_mode(st, 0);
+}
+
+static int __devinit ad799x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret, regdone = 0;
+ struct ad799x_platform_data *pdata = client->dev.platform_data;
+ struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, st);
+
+ atomic_set(&st->protect_ring, 0);
+ st->id = id->driver_data;
+ st->chip_info = &ad799x_chip_info_tbl[st->id];
+ st->config = st->chip_info->default_config;
+
+ if (pdata)
+ st->int_vref_mv = pdata->vref_mv;
+ else
+ st->int_vref_mv = st->chip_info->int_vref_mv;
+
+ st->reg = regulator_get(&client->dev, "vcc");
+ if (!IS_ERR(st->reg)) {
+ ret = regulator_enable(st->reg);
+ if (ret)
+ goto error_put_reg;
+ }
+ st->client = client;
+
+ st->indio_dev = iio_allocate_device();
+ if (st->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_disable_reg;
+ }
+
+ /* Estabilish that the iio_dev is a child of the i2c device */
+ st->indio_dev->dev.parent = &client->dev;
+ st->indio_dev->attrs = st->chip_info->dev_attrs;
+ st->indio_dev->scan_el_attrs = st->chip_info->scan_attrs;
+ st->indio_dev->event_attrs = st->chip_info->event_attrs;
+
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+ st->indio_dev->num_interrupt_lines = 1;
+
+ ret = ad799x_initial_setup(st);
+ if (ret)
+ goto error_free_device;
+
+ ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
+ if (ret)
+ goto error_free_device;
+
+ ret = iio_device_register(st->indio_dev);
+ if (ret)
+ goto error_cleanup_ring;
+ regdone = 1;
+ ret = ad799x_initialize_ring(st->indio_dev->ring);
+ if (ret)
+ goto error_cleanup_ring;
+
+ if (client->irq > 0 && st->chip_info->monitor_mode) {
+ INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
+
+ ret = iio_register_interrupt_line(client->irq,
+ st->indio_dev,
+ 0,
+ IRQF_TRIGGER_FALLING,
+ client->name);
+ if (ret)
+ goto error_cleanup_ring;
+
+ /*
+ * The event handler list element refer to iio_event_ad799x.
+ * All event attributes bind to the same event handler.
+ * So, only register event handler once.
+ */
+ iio_add_event_to_list(&iio_event_ad799x,
+ &st->indio_dev->interrupts[0]->ev_list);
+ }
+
+ return 0;
+error_cleanup_ring:
+ ad799x_ring_cleanup(st->indio_dev);
+error_free_device:
+ if (!regdone)
+ iio_free_device(st->indio_dev);
+ else
+ iio_device_unregister(st->indio_dev);
+error_disable_reg:
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+error_put_reg:
+ if (!IS_ERR(st->reg))
+ regulator_put(st->reg);
+ kfree(st);
+
+error_ret:
+ return ret;
+}
+
+static int ad799x_remove(struct i2c_client *client)
+{
+ struct ad799x_state *st = i2c_get_clientdata(client);
+ struct iio_dev *indio_dev = st->indio_dev;
+
+ if (client->irq > 0 && st->chip_info->monitor_mode)
+ iio_unregister_interrupt_line(indio_dev, 0);
+
+ ad799x_uninitialize_ring(indio_dev->ring);
+ ad799x_ring_cleanup(indio_dev);
+ iio_device_unregister(indio_dev);
+ if (!IS_ERR(st->reg)) {
+ regulator_disable(st->reg);
+ regulator_put(st->reg);
+ }
+ kfree(st);
+
+ 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,
+};
+
+static __init int ad799x_init(void)
+{
+ return i2c_add_driver(&ad799x_driver);
+}
+
+static __exit void ad799x_exit(void)
+{
+ i2c_del_driver(&ad799x_driver);
+}
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD799x ADC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("i2c:ad7160");
+
+module_init(ad799x_init);
+module_exit(ad799x_exit);
diff --git a/drivers/staging/iio/adc/ad799x_ring.c
b/drivers/staging/iio/adc/ad799x_ring.c
new file mode 100644
index 0000000..c785c9f
--- /dev/null
+++ b/drivers/staging/iio/adc/ad799x_ring.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
+ * Copyright (C) 2008-2010 Jonathan Cameron
+ *
+ * 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_ring.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/bitops.h>
+
+#include "../iio.h"
+#include "../ring_generic.h"
+#include "../ring_sw.h"
+#include "../trigger.h"
+#include "../sysfs.h"
+
+#include "ad799x.h"
+
+int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
+{
+ unsigned long numvals;
+ int count = 0, ret;
+ u16 *ring_data;
+ if (!(st->indio_dev->scan_mask & mask)) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ numvals = st->indio_dev->scan_count;
+
+ ring_data = kmalloc(numvals * 2, GFP_KERNEL);
+ if (ring_data == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = st->indio_dev->ring->access.read_last(st->indio_dev->ring,
+ (u8 *) ring_data);
+ if (ret)
+ goto error_free_ring_data;
+ /* Need a count of channels prior to this one */
+ mask >>= 1;
+ while (mask) {
+ if (mask & st->indio_dev->scan_mask)
+ count++;
+ mask >>= 1;
+ }
+
+ ret = be16_to_cpu(ring_data[count]) & 0xFFF;
+
+error_free_ring_data:
+ kfree(ring_data);
+error_ret:
+ return ret;
+}
+
+/**
+ * ad799x_ring_preenable() setup the parameters of the ring before
enabling
+ *
+ * The complex nature of the setting of the nuber of bytes per datum is
due
+ * to this driver currently ensuring that the timestamp is stored at an
8
+ * byte boundary.
+ **/
+static int ad799x_ring_preenable(struct iio_dev *indio_dev)
+{
+ struct ad799x_state *st = indio_dev->dev_data;
+ size_t d_size;
+ unsigned long numvals;
+
+ /*
+ * Need to figure out the current mode based upon the requested
+ * scan mask in iio_dev
+ */
+
+ if (st->id == ad7997 || st->id == ad7998)
+ ad799x_set_scan_mode(st, st->indio_dev->scan_mask);
+
+ numvals = st->indio_dev->scan_count;
+
+ if (indio_dev->ring->access.set_bpd) {
+ d_size = numvals*2 + sizeof(s64);
+ if (d_size % 8)
+ d_size += 8 - (d_size % 8);
+ indio_dev->ring->access.set_bpd(indio_dev->ring, d_size);
+ }
+
+ return 0;
+}
+
+/**
+ * ad799x_ring_postenable() typical ring post enable
+ *
+ * Only not moved into the core for the hardware ring buffer cases
+ * that are more sophisticated.
+ **/
+static int ad799x_ring_postenable(struct iio_dev *indio_dev)
+{
+ if (indio_dev->trig == NULL)
+ return 0;
+ return iio_trigger_attach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+}
+
+/**
+ * ad799x_ring_predisable() runs just prior to ring buffer being
disabled
+ *
+ * Typical predisable function which ensures that no trigger events can
+ * occur before we disable the ring buffer (and hence would have no
idea
+ * what to do with them)
+ **/
+static int ad799x_ring_predisable(struct iio_dev *indio_dev)
+{
+ if (indio_dev->trig)
+ return iio_trigger_dettach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+ else
+ return 0;
+}
+
+/**
+ * ad799x_poll_func_th() th of trigger launched polling to ring buffer
+ *
+ * As sampling only occurs on i2c comms occuring, leave timestamping
until
+ * then. Some triggers will generate their own time stamp. Currently
+ * there is no way of notifying them when no one cares.
+ **/
+static void ad799x_poll_func_th(struct iio_dev *indio_dev)
+{
+ struct ad799x_state *st = indio_dev->dev_data;
+
+ schedule_work(&st->poll_work);
+
+ return;
+}
+/**
+ * ad799x_poll_bh_to_ring() bh of trigger launched polling to ring
buffer
+ * @work_s: the work struct through which this was scheduled
+ *
+ * Currently there is no option in this driver to disable the saving of
+ * timestamps within the ring.
+ * I think the one copy of this at a time was to avoid problems if the
+ * trigger was set far too high and the reads then locked up the
computer.
+ **/
+static void ad799x_poll_bh_to_ring(struct work_struct *work_s)
+{
+ struct ad799x_state *st = container_of(work_s, struct ad799x_state,
+ poll_work);
+ struct iio_dev *indio_dev = st->indio_dev;
+ struct iio_sw_ring_buffer *ring = iio_to_sw_ring(indio_dev->ring);
+ s64 time_ns;
+ __u8 *rxbuf;
+ int b_sent;
+ size_t d_size;
+ u8 cmd;
+
+ unsigned long numvals = st->indio_dev->scan_count;
+
+ /* Ensure the timestamp is 8 byte aligned */
+ d_size = numvals*2 + sizeof(s64);
+
+ if (d_size % sizeof(s64))
+ d_size += sizeof(s64) - (d_size % sizeof(s64));
+
+ /* Ensure only one copy of this function running at a time */
+ if (atomic_inc_return(&st->protect_ring) > 1)
+ return;
+
+ /* Monitor mode prevents reading. Whilst not currently implemented
+ * might as well have this test in here in the meantime as it does
+ * no harm.
+ */
+ if (numvals == 0)
+ return;
+
+ rxbuf = kmalloc(d_size, GFP_KERNEL);
+ if (rxbuf == NULL)
+ return;
+
+ switch (st->id) {
+ case ad7991:
+ case ad7995:
+ case ad7999:
+ cmd = st->config |
+ (st->indio_dev->scan_mask << AD799X_CHANNEL_SHIFT);
+ break;
+ case ad7992:
+ case ad7993:
+ case ad7994:
+ cmd = (st->indio_dev->scan_mask <<
+ AD799X_CHANNEL_SHIFT) | AD799X_CONV_RES_REG;
+ break;
+ case ad7997:
+ case ad7998:
+ cmd = AD7997_8_READ_SEQUENCE | AD799X_CONV_RES_REG;
+ break;
+ default:
+ cmd = 0;
+ }
+
+ b_sent = i2c_smbus_read_i2c_block_data(st->client,
+ cmd, numvals*2, rxbuf);
+ if (b_sent < 0)
+ goto done;
+
+ time_ns = iio_get_time_ns();
+
+ memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
+
+ indio_dev->ring->access.store_to(&ring->buf, rxbuf, time_ns);
+done:
+ kfree(rxbuf);
+ atomic_dec(&st->protect_ring);
+}
+
+
+int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+ struct ad799x_state *st = indio_dev->dev_data;
+ int ret = 0;
+
+ indio_dev->ring = iio_sw_rb_allocate(indio_dev);
+ if (!indio_dev->ring) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ /* Effectively select the ring buffer implementation */
+ iio_ring_sw_register_funcs(&st->indio_dev->ring->access);
+ indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc),
GFP_KERNEL);
+ if (indio_dev->pollfunc == NULL) {
+ ret = -ENOMEM;
+ goto error_deallocate_sw_rb;
+ }
+ /* Configure the polling function called on trigger interrupts */
+ indio_dev->pollfunc->poll_func_main = &ad799x_poll_func_th;
+ indio_dev->pollfunc->private_data = indio_dev;
+
+ /* Ring buffer functions - here trigger setup related */
+ indio_dev->ring->postenable = &ad799x_ring_postenable;
+ indio_dev->ring->preenable = &ad799x_ring_preenable;
+ indio_dev->ring->predisable = &ad799x_ring_predisable;
+ INIT_WORK(&st->poll_work, &ad799x_poll_bh_to_ring);
+
+ /* Flag that polled ring buffering is possible */
+ indio_dev->modes |= INDIO_RING_TRIGGERED;
+ return 0;
+error_deallocate_sw_rb:
+ iio_sw_rb_free(indio_dev->ring);
+error_ret:
+ return ret;
+}
+
+void ad799x_ring_cleanup(struct iio_dev *indio_dev)
+{
+ /* ensure that the trigger has been detached */
+ if (indio_dev->trig) {
+ iio_put_trigger(indio_dev->trig);
+ iio_trigger_dettach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+ }
+ kfree(indio_dev->pollfunc);
+ iio_sw_rb_free(indio_dev->ring);
+}
+
+void ad799x_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+ iio_ring_buffer_unregister(ring);
+};
+
+int ad799x_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return iio_ring_buffer_register(ring, 0);
+};
--
1.6.0.2
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