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Message-ID: <20190301025331.ucqd7unbgaqfcuaf@smtp.gmail.com>
Date: Thu, 28 Feb 2019 23:53:31 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
knaack.h@....de, pmeerw@...erw.net
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel-usp@...glegroups.com
Subject: [PATCH v2 4/4] staging: iio: ad5933: move out of staging
Move ad5933 impedance-analyzer driver from staging to mainline.
The ad5933 is a high precision impedance converter system solution that
combines an on-board frequency generator with an analog-to-digital
converter (ADC). This driver was designed to be compatible with both
ad5933 and ad5934 chips.
Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@...il.com>
---
drivers/iio/impedance-analyzer/Kconfig | 18 +
drivers/iio/impedance-analyzer/Makefile | 5 +
drivers/iio/impedance-analyzer/ad5933.c | 811 ++++++++++++++++++
.../staging/iio/impedance-analyzer/Kconfig | 18 -
.../staging/iio/impedance-analyzer/Makefile | 5 -
.../staging/iio/impedance-analyzer/ad5933.c | 811 ------------------
6 files changed, 834 insertions(+), 834 deletions(-)
create mode 100644 drivers/iio/impedance-analyzer/Kconfig
create mode 100644 drivers/iio/impedance-analyzer/Makefile
create mode 100644 drivers/iio/impedance-analyzer/ad5933.c
delete mode 100644 drivers/staging/iio/impedance-analyzer/Kconfig
delete mode 100644 drivers/staging/iio/impedance-analyzer/Makefile
delete mode 100644 drivers/staging/iio/impedance-analyzer/ad5933.c
diff --git a/drivers/iio/impedance-analyzer/Kconfig b/drivers/iio/impedance-analyzer/Kconfig
new file mode 100644
index 000000000000..b9a679cdd146
--- /dev/null
+++ b/drivers/iio/impedance-analyzer/Kconfig
@@ -0,0 +1,18 @@
+#
+# Impedance Converter, Network Analyzer drivers
+#
+menu "Network Analyzer, Impedance Converters"
+
+config AD5933
+ tristate "Analog Devices AD5933, AD5934 driver"
+ depends on I2C
+ select IIO_BUFFER
+ select IIO_KFIFO_BUF
+ help
+ Say yes here to build support for Analog Devices Impedance Converter,
+ Network Analyzer, AD5933/4.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad5933.
+
+endmenu
diff --git a/drivers/iio/impedance-analyzer/Makefile b/drivers/iio/impedance-analyzer/Makefile
new file mode 100644
index 000000000000..7604d786583e
--- /dev/null
+++ b/drivers/iio/impedance-analyzer/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for Impedance Converter, Network Analyzer drivers
+#
+
+obj-$(CONFIG_AD5933) += ad5933.o
diff --git a/drivers/iio/impedance-analyzer/ad5933.c b/drivers/iio/impedance-analyzer/ad5933.c
new file mode 100644
index 000000000000..d75bdfbf93de
--- /dev/null
+++ b/drivers/iio/impedance-analyzer/ad5933.c
@@ -0,0 +1,811 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD5933 AD5934 Impedance Converter, Network Analyzer
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/sysfs.h>
+
+/* AD5933/AD5934 Registers */
+#define AD5933_REG_CONTROL_HB 0x80 /* R/W, 1 byte */
+#define AD5933_REG_CONTROL_LB 0x81 /* R/W, 1 byte */
+#define AD5933_REG_FREQ_START 0x82 /* R/W, 3 bytes */
+#define AD5933_REG_FREQ_INC 0x85 /* R/W, 3 bytes */
+#define AD5933_REG_INC_NUM 0x88 /* R/W, 2 bytes, 9 bit */
+#define AD5933_REG_SETTLING_CYCLES 0x8A /* R/W, 2 bytes */
+#define AD5933_REG_STATUS 0x8F /* R, 1 byte */
+#define AD5933_REG_TEMP_DATA 0x92 /* R, 2 bytes*/
+#define AD5933_REG_REAL_DATA 0x94 /* R, 2 bytes*/
+#define AD5933_REG_IMAG_DATA 0x96 /* R, 2 bytes*/
+
+/* AD5933_REG_CONTROL_HB Bits */
+#define AD5933_CTRL_INIT_START_FREQ (0x1 << 4)
+#define AD5933_CTRL_START_SWEEP (0x2 << 4)
+#define AD5933_CTRL_INC_FREQ (0x3 << 4)
+#define AD5933_CTRL_REPEAT_FREQ (0x4 << 4)
+#define AD5933_CTRL_MEASURE_TEMP (0x9 << 4)
+#define AD5933_CTRL_POWER_DOWN (0xA << 4)
+#define AD5933_CTRL_STANDBY (0xB << 4)
+
+#define AD5933_CTRL_RANGE_2000mVpp (0x0 << 1)
+#define AD5933_CTRL_RANGE_200mVpp (0x1 << 1)
+#define AD5933_CTRL_RANGE_400mVpp (0x2 << 1)
+#define AD5933_CTRL_RANGE_1000mVpp (0x3 << 1)
+#define AD5933_CTRL_RANGE(x) ((x) << 1)
+
+#define AD5933_CTRL_PGA_GAIN_1 (0x1 << 0)
+#define AD5933_CTRL_PGA_GAIN_5 (0x0 << 0)
+
+/* AD5933_REG_CONTROL_LB Bits */
+#define AD5933_CTRL_RESET (0x1 << 4)
+#define AD5933_CTRL_INT_SYSCLK (0x0 << 3)
+#define AD5933_CTRL_EXT_SYSCLK (0x1 << 3)
+
+/* AD5933_REG_STATUS Bits */
+#define AD5933_STAT_TEMP_VALID (0x1 << 0)
+#define AD5933_STAT_DATA_VALID (0x1 << 1)
+#define AD5933_STAT_SWEEP_DONE (0x1 << 2)
+
+/* I2C Block Commands */
+#define AD5933_I2C_BLOCK_WRITE 0xA0
+#define AD5933_I2C_BLOCK_READ 0xA1
+#define AD5933_I2C_ADDR_POINTER 0xB0
+
+/* Device Specs */
+#define AD5933_INT_OSC_FREQ_Hz 16776000
+#define AD5933_MAX_OUTPUT_FREQ_Hz 100000
+#define AD5933_MAX_RETRIES 100
+
+#define AD5933_OUT_RANGE 1
+#define AD5933_OUT_RANGE_AVAIL 2
+#define AD5933_OUT_SETTLING_CYCLES 3
+#define AD5933_IN_PGA_GAIN 4
+#define AD5933_IN_PGA_GAIN_AVAIL 5
+#define AD5933_FREQ_POINTS 6
+
+#define AD5933_POLL_TIME_ms 10
+#define AD5933_INIT_EXCITATION_TIME_ms 100
+
+struct ad5933_state {
+ struct i2c_client *client;
+ struct regulator *reg;
+ struct clk *mclk;
+ struct delayed_work work;
+ struct mutex lock; /* Protect sensor state */
+ unsigned long mclk_hz;
+ unsigned char ctrl_hb;
+ unsigned char ctrl_lb;
+ unsigned int range_avail[4];
+ unsigned short vref_mv;
+ unsigned short settling_cycles;
+ unsigned short freq_points;
+ unsigned int freq_start;
+ unsigned int freq_inc;
+ unsigned int state;
+ unsigned int poll_time_jiffies;
+};
+
+#define AD5933_CHANNEL(_type, _extend_name, _info_mask_separate, _address, \
+ _scan_index, _realbits) { \
+ .type = (_type), \
+ .extend_name = (_extend_name), \
+ .info_mask_separate = (_info_mask_separate), \
+ .address = (_address), \
+ .scan_index = (_scan_index), \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = (_realbits), \
+ .storagebits = 16, \
+ }, \
+}
+
+static const struct iio_chan_spec ad5933_channels[] = {
+ AD5933_CHANNEL(IIO_TEMP, NULL, BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE), AD5933_REG_TEMP_DATA, -1, 14),
+ /* Ring Channels */
+ AD5933_CHANNEL(IIO_VOLTAGE, "real", 0, AD5933_REG_REAL_DATA, 0, 16),
+ AD5933_CHANNEL(IIO_VOLTAGE, "imag", 0, AD5933_REG_IMAG_DATA, 1, 16),
+};
+
+static int ad5933_i2c_write(struct i2c_client *client, u8 reg, u8 len, u8 *data)
+{
+ int ret;
+
+ while (len--) {
+ ret = i2c_smbus_write_byte_data(client, reg++, *data++);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C write error\n");
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static int ad5933_i2c_read(struct i2c_client *client, u8 reg, u8 len, u8 *data)
+{
+ int ret;
+
+ while (len--) {
+ ret = i2c_smbus_read_byte_data(client, reg++);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+ *data++ = ret;
+ }
+ return 0;
+}
+
+static int ad5933_cmd(struct ad5933_state *st, unsigned char cmd)
+{
+ unsigned char dat = st->ctrl_hb | cmd;
+
+ return ad5933_i2c_write(st->client,
+ AD5933_REG_CONTROL_HB, 1, &dat);
+}
+
+static int ad5933_reset(struct ad5933_state *st)
+{
+ unsigned char dat = st->ctrl_lb | AD5933_CTRL_RESET;
+
+ return ad5933_i2c_write(st->client,
+ AD5933_REG_CONTROL_LB, 1, &dat);
+}
+
+static int ad5933_wait_busy(struct ad5933_state *st, unsigned char event)
+{
+ unsigned char val, timeout = AD5933_MAX_RETRIES;
+ int ret;
+
+ while (timeout--) {
+ ret = ad5933_i2c_read(st->client, AD5933_REG_STATUS, 1, &val);
+ if (ret < 0)
+ return ret;
+ if (val & event)
+ return val;
+ cpu_relax();
+ mdelay(1);
+ }
+
+ return -EAGAIN;
+}
+
+static int ad5933_set_freq(struct ad5933_state *st,
+ unsigned int reg, unsigned long freq)
+{
+ unsigned long long freqreg;
+ union {
+ __be32 d32;
+ u8 d8[4];
+ } dat;
+
+ freqreg = (u64)freq * (u64)(1 << 27);
+ do_div(freqreg, st->mclk_hz / 4);
+
+ switch (reg) {
+ case AD5933_REG_FREQ_START:
+ st->freq_start = freq;
+ break;
+ case AD5933_REG_FREQ_INC:
+ st->freq_inc = freq;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ dat.d32 = cpu_to_be32(freqreg);
+ return ad5933_i2c_write(st->client, reg, 3, &dat.d8[1]);
+}
+
+static int ad5933_setup(struct ad5933_state *st)
+{
+ __be16 dat;
+ int ret;
+
+ ret = ad5933_reset(st);
+ if (ret < 0)
+ return ret;
+
+ ret = ad5933_set_freq(st, AD5933_REG_FREQ_START, 10000);
+ if (ret < 0)
+ return ret;
+
+ ret = ad5933_set_freq(st, AD5933_REG_FREQ_INC, 200);
+ if (ret < 0)
+ return ret;
+
+ st->settling_cycles = 10;
+ dat = cpu_to_be16(st->settling_cycles);
+
+ ret = ad5933_i2c_write(st->client,
+ AD5933_REG_SETTLING_CYCLES,
+ 2, (u8 *)&dat);
+ if (ret < 0)
+ return ret;
+
+ st->freq_points = 100;
+ dat = cpu_to_be16(st->freq_points);
+
+ return ad5933_i2c_write(st->client, AD5933_REG_INC_NUM, 2, (u8 *)&dat);
+}
+
+static void ad5933_calc_out_ranges(struct ad5933_state *st)
+{
+ int i;
+ unsigned int normalized_3v3[4] = {1980, 198, 383, 970};
+
+ for (i = 0; i < 4; i++)
+ st->range_avail[i] = normalized_3v3[i] * st->vref_mv / 3300;
+}
+
+/*
+ * handles: AD5933_REG_FREQ_START and AD5933_REG_FREQ_INC
+ */
+
+static ssize_t ad5933_show_frequency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad5933_state *st = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret;
+ unsigned long long freqreg;
+ union {
+ __be32 d32;
+ u8 d8[4];
+ } dat;
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ ret = ad5933_i2c_read(st->client, this_attr->address, 3, &dat.d8[1]);
+ iio_device_release_direct_mode(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ freqreg = be32_to_cpu(dat.d32) & 0xFFFFFF;
+
+ freqreg = (u64)freqreg * (u64)(st->mclk_hz / 4);
+ do_div(freqreg, 1 << 27);
+
+ return sprintf(buf, "%d\n", (int)freqreg);
+}
+
+static ssize_t ad5933_store_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 ad5933_state *st = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ if (val > AD5933_MAX_OUTPUT_FREQ_Hz)
+ return -EINVAL;
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ ret = ad5933_set_freq(st, this_attr->address, val);
+ iio_device_release_direct_mode(indio_dev);
+
+ return ret ? ret : len;
+}
+
+static IIO_DEVICE_ATTR(out_voltage0_freq_start, 0644,
+ ad5933_show_frequency,
+ ad5933_store_frequency,
+ AD5933_REG_FREQ_START);
+
+static IIO_DEVICE_ATTR(out_voltage0_freq_increment, 0644,
+ ad5933_show_frequency,
+ ad5933_store_frequency,
+ AD5933_REG_FREQ_INC);
+
+static ssize_t ad5933_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad5933_state *st = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret = 0, len = 0;
+
+ mutex_lock(&st->lock);
+ switch ((u32)this_attr->address) {
+ case AD5933_OUT_RANGE:
+ len = sprintf(buf, "%u\n",
+ st->range_avail[(st->ctrl_hb >> 1) & 0x3]);
+ break;
+ case AD5933_OUT_RANGE_AVAIL:
+ len = sprintf(buf, "%u %u %u %u\n", st->range_avail[0],
+ st->range_avail[3], st->range_avail[2],
+ st->range_avail[1]);
+ break;
+ case AD5933_OUT_SETTLING_CYCLES:
+ len = sprintf(buf, "%d\n", st->settling_cycles);
+ break;
+ case AD5933_IN_PGA_GAIN:
+ len = sprintf(buf, "%s\n",
+ (st->ctrl_hb & AD5933_CTRL_PGA_GAIN_1) ?
+ "1" : "0.2");
+ break;
+ case AD5933_IN_PGA_GAIN_AVAIL:
+ len = sprintf(buf, "1 0.2\n");
+ break;
+ case AD5933_FREQ_POINTS:
+ len = sprintf(buf, "%d\n", st->freq_points);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&st->lock);
+ return ret ? ret : len;
+}
+
+static ssize_t ad5933_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad5933_state *st = iio_priv(indio_dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ u16 val;
+ int i, ret = 0;
+ __be16 dat;
+
+ if (this_attr->address != AD5933_IN_PGA_GAIN) {
+ ret = kstrtou16(buf, 10, &val);
+ if (ret)
+ return ret;
+ }
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ mutex_lock(&st->lock);
+ switch ((u32)this_attr->address) {
+ case AD5933_OUT_RANGE:
+ ret = -EINVAL;
+ for (i = 0; i < 4; i++)
+ if (val == st->range_avail[i]) {
+ st->ctrl_hb &= ~AD5933_CTRL_RANGE(0x3);
+ st->ctrl_hb |= AD5933_CTRL_RANGE(i);
+ ret = ad5933_cmd(st, 0);
+ break;
+ }
+ break;
+ case AD5933_IN_PGA_GAIN:
+ if (sysfs_streq(buf, "1")) {
+ st->ctrl_hb |= AD5933_CTRL_PGA_GAIN_1;
+ } else if (sysfs_streq(buf, "0.2")) {
+ st->ctrl_hb &= ~AD5933_CTRL_PGA_GAIN_1;
+ } else {
+ ret = -EINVAL;
+ break;
+ }
+ ret = ad5933_cmd(st, 0);
+ break;
+ case AD5933_OUT_SETTLING_CYCLES:
+ val = clamp(val, (u16)0, (u16)0x7FF);
+ st->settling_cycles = val;
+
+ /* 2x, 4x handling, see datasheet */
+ if (val > 1022)
+ val = (val >> 2) | (3 << 9);
+ else if (val > 511)
+ val = (val >> 1) | (1 << 9);
+
+ dat = cpu_to_be16(val);
+ ret = ad5933_i2c_write(st->client,
+ AD5933_REG_SETTLING_CYCLES,
+ 2, (u8 *)&dat);
+ break;
+ case AD5933_FREQ_POINTS:
+ val = clamp(val, (u16)0, (u16)511);
+ st->freq_points = val;
+
+ dat = cpu_to_be16(val);
+ ret = ad5933_i2c_write(st->client, AD5933_REG_INC_NUM, 2,
+ (u8 *)&dat);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&st->lock);
+ iio_device_release_direct_mode(indio_dev);
+ return ret ? ret : len;
+}
+
+static IIO_DEVICE_ATTR(out_voltage0_scale, 0644,
+ ad5933_show,
+ ad5933_store,
+ AD5933_OUT_RANGE);
+
+static IIO_DEVICE_ATTR(out_voltage0_scale_available, 0444,
+ ad5933_show,
+ NULL,
+ AD5933_OUT_RANGE_AVAIL);
+
+static IIO_DEVICE_ATTR(in_voltage0_scale, 0644,
+ ad5933_show,
+ ad5933_store,
+ AD5933_IN_PGA_GAIN);
+
+static IIO_DEVICE_ATTR(in_voltage0_scale_available, 0444,
+ ad5933_show,
+ NULL,
+ AD5933_IN_PGA_GAIN_AVAIL);
+
+static IIO_DEVICE_ATTR(out_voltage0_freq_points, 0644,
+ ad5933_show,
+ ad5933_store,
+ AD5933_FREQ_POINTS);
+
+static IIO_DEVICE_ATTR(out_voltage0_settling_cycles, 0644,
+ ad5933_show,
+ ad5933_store,
+ AD5933_OUT_SETTLING_CYCLES);
+
+/*
+ * note:
+ * ideally we would handle the scale attributes via the iio_info
+ * (read|write)_raw methods, however this part is a untypical since we
+ * don't create dedicated sysfs channel attributes for out0 and in0.
+ */
+static struct attribute *ad5933_attributes[] = {
+ &iio_dev_attr_out_voltage0_scale.dev_attr.attr,
+ &iio_dev_attr_out_voltage0_scale_available.dev_attr.attr,
+ &iio_dev_attr_out_voltage0_freq_start.dev_attr.attr,
+ &iio_dev_attr_out_voltage0_freq_increment.dev_attr.attr,
+ &iio_dev_attr_out_voltage0_freq_points.dev_attr.attr,
+ &iio_dev_attr_out_voltage0_settling_cycles.dev_attr.attr,
+ &iio_dev_attr_in_voltage0_scale.dev_attr.attr,
+ &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group ad5933_attribute_group = {
+ .attrs = ad5933_attributes,
+};
+
+static int ad5933_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct ad5933_state *st = iio_priv(indio_dev);
+ __be16 dat;
+ int ret;
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ ret = ad5933_cmd(st, AD5933_CTRL_MEASURE_TEMP);
+ if (ret < 0)
+ goto out;
+ ret = ad5933_wait_busy(st, AD5933_STAT_TEMP_VALID);
+ if (ret < 0)
+ goto out;
+
+ ret = ad5933_i2c_read(st->client,
+ AD5933_REG_TEMP_DATA,
+ 2, (u8 *)&dat);
+ if (ret < 0)
+ goto out;
+ iio_device_release_direct_mode(indio_dev);
+ *val = sign_extend32(be16_to_cpu(dat), 13);
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1000;
+ *val2 = 5;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+
+ return -EINVAL;
+out:
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
+}
+
+static const struct iio_info ad5933_info = {
+ .read_raw = ad5933_read_raw,
+ .attrs = &ad5933_attribute_group,
+};
+
+static int ad5933_ring_preenable(struct iio_dev *indio_dev)
+{
+ struct ad5933_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
+ return -EINVAL;
+
+ ret = ad5933_reset(st);
+ if (ret < 0)
+ return ret;
+
+ ret = ad5933_cmd(st, AD5933_CTRL_STANDBY);
+ if (ret < 0)
+ return ret;
+
+ ret = ad5933_cmd(st, AD5933_CTRL_INIT_START_FREQ);
+ if (ret < 0)
+ return ret;
+
+ st->state = AD5933_CTRL_INIT_START_FREQ;
+
+ return 0;
+}
+
+static int ad5933_ring_postenable(struct iio_dev *indio_dev)
+{
+ struct ad5933_state *st = iio_priv(indio_dev);
+
+ /*
+ * AD5933_CTRL_INIT_START_FREQ:
+ * High Q complex circuits require a long time to reach steady state.
+ * To facilitate the measurement of such impedances, this mode allows
+ * the user full control of the settling time requirement before
+ * entering start frequency sweep mode where the impedance measurement
+ * takes place. In this mode the impedance is excited with the
+ * programmed start frequency (ad5933_ring_preenable),
+ * but no measurement takes place.
+ */
+
+ schedule_delayed_work(&st->work,
+ msecs_to_jiffies(AD5933_INIT_EXCITATION_TIME_ms));
+ return 0;
+}
+
+static int ad5933_ring_postdisable(struct iio_dev *indio_dev)
+{
+ struct ad5933_state *st = iio_priv(indio_dev);
+
+ cancel_delayed_work_sync(&st->work);
+ return ad5933_cmd(st, AD5933_CTRL_POWER_DOWN);
+}
+
+static const struct iio_buffer_setup_ops ad5933_ring_setup_ops = {
+ .preenable = ad5933_ring_preenable,
+ .postenable = ad5933_ring_postenable,
+ .postdisable = ad5933_ring_postdisable,
+};
+
+static int ad5933_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+ struct iio_buffer *buffer;
+
+ buffer = iio_kfifo_allocate();
+ if (!buffer)
+ return -ENOMEM;
+
+ iio_device_attach_buffer(indio_dev, buffer);
+
+ /* Ring buffer functions - here trigger setup related */
+ indio_dev->setup_ops = &ad5933_ring_setup_ops;
+
+ return 0;
+}
+
+static void ad5933_work(struct work_struct *work)
+{
+ struct ad5933_state *st = container_of(work,
+ struct ad5933_state, work.work);
+ struct iio_dev *indio_dev = i2c_get_clientdata(st->client);
+ __be16 buf[2];
+ int val[2];
+ unsigned char status;
+ int ret;
+
+ if (st->state == AD5933_CTRL_INIT_START_FREQ) {
+ /* start sweep */
+ ad5933_cmd(st, AD5933_CTRL_START_SWEEP);
+ st->state = AD5933_CTRL_START_SWEEP;
+ schedule_delayed_work(&st->work, st->poll_time_jiffies);
+ return;
+ }
+
+ ret = ad5933_i2c_read(st->client, AD5933_REG_STATUS, 1, &status);
+ if (ret)
+ return;
+
+ if (status & AD5933_STAT_DATA_VALID) {
+ int scan_count = bitmap_weight(indio_dev->active_scan_mask,
+ indio_dev->masklength);
+ ret = ad5933_i2c_read(st->client,
+ test_bit(1, indio_dev->active_scan_mask) ?
+ AD5933_REG_REAL_DATA : AD5933_REG_IMAG_DATA,
+ scan_count * 2, (u8 *)buf);
+ if (ret)
+ return;
+
+ if (scan_count == 2) {
+ val[0] = be16_to_cpu(buf[0]);
+ val[1] = be16_to_cpu(buf[1]);
+ } else {
+ val[0] = be16_to_cpu(buf[0]);
+ }
+ iio_push_to_buffers(indio_dev, val);
+ } else {
+ /* no data available - try again later */
+ schedule_delayed_work(&st->work, st->poll_time_jiffies);
+ return;
+ }
+
+ if (status & AD5933_STAT_SWEEP_DONE) {
+ /*
+ * last sample received - power down do
+ * nothing until the ring enable is toggled
+ */
+ ad5933_cmd(st, AD5933_CTRL_POWER_DOWN);
+ } else {
+ /* we just received a valid datum, move on to the next */
+ ad5933_cmd(st, AD5933_CTRL_INC_FREQ);
+ schedule_delayed_work(&st->work, st->poll_time_jiffies);
+ }
+}
+
+static int ad5933_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct ad5933_state *st;
+ struct iio_dev *indio_dev;
+ unsigned long ext_clk_hz = 0;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ st->client = client;
+
+ mutex_init(&st->lock);
+
+ st->reg = devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(st->reg))
+ return PTR_ERR(st->reg);
+
+ ret = regulator_enable(st->reg);
+ if (ret) {
+ dev_err(&client->dev, "Failed to enable specified VDD supply\n");
+ return ret;
+ }
+ ret = regulator_get_voltage(st->reg);
+
+ if (ret < 0)
+ goto error_disable_reg;
+
+ st->vref_mv = ret / 1000;
+
+ st->mclk = devm_clk_get(&client->dev, "mclk");
+ if (IS_ERR(st->mclk) && PTR_ERR(st->mclk) != -ENOENT) {
+ ret = PTR_ERR(st->mclk);
+ goto error_disable_reg;
+ }
+
+ if (!IS_ERR(st->mclk)) {
+ ret = clk_prepare_enable(st->mclk);
+ if (ret < 0)
+ goto error_disable_reg;
+ ext_clk_hz = clk_get_rate(st->mclk);
+ }
+
+ if (ext_clk_hz) {
+ st->mclk_hz = ext_clk_hz;
+ st->ctrl_lb = AD5933_CTRL_EXT_SYSCLK;
+ } else {
+ st->mclk_hz = AD5933_INT_OSC_FREQ_Hz;
+ st->ctrl_lb = AD5933_CTRL_INT_SYSCLK;
+ }
+
+ ad5933_calc_out_ranges(st);
+ INIT_DELAYED_WORK(&st->work, ad5933_work);
+ st->poll_time_jiffies = msecs_to_jiffies(AD5933_POLL_TIME_ms);
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &ad5933_info;
+ indio_dev->name = id->name;
+ indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
+ indio_dev->channels = ad5933_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ad5933_channels);
+
+ ret = ad5933_register_ring_funcs_and_init(indio_dev);
+ if (ret)
+ goto error_disable_mclk;
+
+ ret = ad5933_setup(st);
+ if (ret)
+ goto error_unreg_ring;
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_unreg_ring;
+
+ return 0;
+
+error_unreg_ring:
+ iio_kfifo_free(indio_dev->buffer);
+error_disable_mclk:
+ clk_disable_unprepare(st->mclk);
+error_disable_reg:
+ regulator_disable(st->reg);
+
+ return ret;
+}
+
+static int ad5933_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct ad5933_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ iio_kfifo_free(indio_dev->buffer);
+ regulator_disable(st->reg);
+ clk_disable_unprepare(st->mclk);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad5933_id[] = {
+ { "ad5933", 0 },
+ { "ad5934", 0 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad5933_id);
+
+static const struct of_device_id ad5933_of_match[] = {
+ { .compatible = "adi,ad5933" },
+ { .compatible = "adi,ad5934" },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, ad5933_of_match);
+
+static struct i2c_driver ad5933_driver = {
+ .driver = {
+ .name = "ad5933",
+ .of_match_table = ad5933_of_match,
+ },
+ .probe = ad5933_probe,
+ .remove = ad5933_remove,
+ .id_table = ad5933_id,
+};
+module_i2c_driver(ad5933_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD5933 Impedance Conv. Network Analyzer");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/impedance-analyzer/Kconfig b/drivers/staging/iio/impedance-analyzer/Kconfig
deleted file mode 100644
index b9a679cdd146..000000000000
--- a/drivers/staging/iio/impedance-analyzer/Kconfig
+++ /dev/null
@@ -1,18 +0,0 @@
-#
-# Impedance Converter, Network Analyzer drivers
-#
-menu "Network Analyzer, Impedance Converters"
-
-config AD5933
- tristate "Analog Devices AD5933, AD5934 driver"
- depends on I2C
- select IIO_BUFFER
- select IIO_KFIFO_BUF
- help
- Say yes here to build support for Analog Devices Impedance Converter,
- Network Analyzer, AD5933/4.
-
- To compile this driver as a module, choose M here: the
- module will be called ad5933.
-
-endmenu
diff --git a/drivers/staging/iio/impedance-analyzer/Makefile b/drivers/staging/iio/impedance-analyzer/Makefile
deleted file mode 100644
index 7604d786583e..000000000000
--- a/drivers/staging/iio/impedance-analyzer/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-#
-# Makefile for Impedance Converter, Network Analyzer drivers
-#
-
-obj-$(CONFIG_AD5933) += ad5933.o
diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
deleted file mode 100644
index d75bdfbf93de..000000000000
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ /dev/null
@@ -1,811 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * AD5933 AD5934 Impedance Converter, Network Analyzer
- *
- * Copyright 2011 Analog Devices Inc.
- */
-
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/i2c.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/regulator/consumer.h>
-#include <linux/sysfs.h>
-#include <linux/types.h>
-
-#include <linux/iio/buffer.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/kfifo_buf.h>
-#include <linux/iio/sysfs.h>
-
-/* AD5933/AD5934 Registers */
-#define AD5933_REG_CONTROL_HB 0x80 /* R/W, 1 byte */
-#define AD5933_REG_CONTROL_LB 0x81 /* R/W, 1 byte */
-#define AD5933_REG_FREQ_START 0x82 /* R/W, 3 bytes */
-#define AD5933_REG_FREQ_INC 0x85 /* R/W, 3 bytes */
-#define AD5933_REG_INC_NUM 0x88 /* R/W, 2 bytes, 9 bit */
-#define AD5933_REG_SETTLING_CYCLES 0x8A /* R/W, 2 bytes */
-#define AD5933_REG_STATUS 0x8F /* R, 1 byte */
-#define AD5933_REG_TEMP_DATA 0x92 /* R, 2 bytes*/
-#define AD5933_REG_REAL_DATA 0x94 /* R, 2 bytes*/
-#define AD5933_REG_IMAG_DATA 0x96 /* R, 2 bytes*/
-
-/* AD5933_REG_CONTROL_HB Bits */
-#define AD5933_CTRL_INIT_START_FREQ (0x1 << 4)
-#define AD5933_CTRL_START_SWEEP (0x2 << 4)
-#define AD5933_CTRL_INC_FREQ (0x3 << 4)
-#define AD5933_CTRL_REPEAT_FREQ (0x4 << 4)
-#define AD5933_CTRL_MEASURE_TEMP (0x9 << 4)
-#define AD5933_CTRL_POWER_DOWN (0xA << 4)
-#define AD5933_CTRL_STANDBY (0xB << 4)
-
-#define AD5933_CTRL_RANGE_2000mVpp (0x0 << 1)
-#define AD5933_CTRL_RANGE_200mVpp (0x1 << 1)
-#define AD5933_CTRL_RANGE_400mVpp (0x2 << 1)
-#define AD5933_CTRL_RANGE_1000mVpp (0x3 << 1)
-#define AD5933_CTRL_RANGE(x) ((x) << 1)
-
-#define AD5933_CTRL_PGA_GAIN_1 (0x1 << 0)
-#define AD5933_CTRL_PGA_GAIN_5 (0x0 << 0)
-
-/* AD5933_REG_CONTROL_LB Bits */
-#define AD5933_CTRL_RESET (0x1 << 4)
-#define AD5933_CTRL_INT_SYSCLK (0x0 << 3)
-#define AD5933_CTRL_EXT_SYSCLK (0x1 << 3)
-
-/* AD5933_REG_STATUS Bits */
-#define AD5933_STAT_TEMP_VALID (0x1 << 0)
-#define AD5933_STAT_DATA_VALID (0x1 << 1)
-#define AD5933_STAT_SWEEP_DONE (0x1 << 2)
-
-/* I2C Block Commands */
-#define AD5933_I2C_BLOCK_WRITE 0xA0
-#define AD5933_I2C_BLOCK_READ 0xA1
-#define AD5933_I2C_ADDR_POINTER 0xB0
-
-/* Device Specs */
-#define AD5933_INT_OSC_FREQ_Hz 16776000
-#define AD5933_MAX_OUTPUT_FREQ_Hz 100000
-#define AD5933_MAX_RETRIES 100
-
-#define AD5933_OUT_RANGE 1
-#define AD5933_OUT_RANGE_AVAIL 2
-#define AD5933_OUT_SETTLING_CYCLES 3
-#define AD5933_IN_PGA_GAIN 4
-#define AD5933_IN_PGA_GAIN_AVAIL 5
-#define AD5933_FREQ_POINTS 6
-
-#define AD5933_POLL_TIME_ms 10
-#define AD5933_INIT_EXCITATION_TIME_ms 100
-
-struct ad5933_state {
- struct i2c_client *client;
- struct regulator *reg;
- struct clk *mclk;
- struct delayed_work work;
- struct mutex lock; /* Protect sensor state */
- unsigned long mclk_hz;
- unsigned char ctrl_hb;
- unsigned char ctrl_lb;
- unsigned int range_avail[4];
- unsigned short vref_mv;
- unsigned short settling_cycles;
- unsigned short freq_points;
- unsigned int freq_start;
- unsigned int freq_inc;
- unsigned int state;
- unsigned int poll_time_jiffies;
-};
-
-#define AD5933_CHANNEL(_type, _extend_name, _info_mask_separate, _address, \
- _scan_index, _realbits) { \
- .type = (_type), \
- .extend_name = (_extend_name), \
- .info_mask_separate = (_info_mask_separate), \
- .address = (_address), \
- .scan_index = (_scan_index), \
- .scan_type = { \
- .sign = 's', \
- .realbits = (_realbits), \
- .storagebits = 16, \
- }, \
-}
-
-static const struct iio_chan_spec ad5933_channels[] = {
- AD5933_CHANNEL(IIO_TEMP, NULL, BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE), AD5933_REG_TEMP_DATA, -1, 14),
- /* Ring Channels */
- AD5933_CHANNEL(IIO_VOLTAGE, "real", 0, AD5933_REG_REAL_DATA, 0, 16),
- AD5933_CHANNEL(IIO_VOLTAGE, "imag", 0, AD5933_REG_IMAG_DATA, 1, 16),
-};
-
-static int ad5933_i2c_write(struct i2c_client *client, u8 reg, u8 len, u8 *data)
-{
- int ret;
-
- while (len--) {
- ret = i2c_smbus_write_byte_data(client, reg++, *data++);
- if (ret < 0) {
- dev_err(&client->dev, "I2C write error\n");
- return ret;
- }
- }
- return 0;
-}
-
-static int ad5933_i2c_read(struct i2c_client *client, u8 reg, u8 len, u8 *data)
-{
- int ret;
-
- while (len--) {
- ret = i2c_smbus_read_byte_data(client, reg++);
- if (ret < 0) {
- dev_err(&client->dev, "I2C read error\n");
- return ret;
- }
- *data++ = ret;
- }
- return 0;
-}
-
-static int ad5933_cmd(struct ad5933_state *st, unsigned char cmd)
-{
- unsigned char dat = st->ctrl_hb | cmd;
-
- return ad5933_i2c_write(st->client,
- AD5933_REG_CONTROL_HB, 1, &dat);
-}
-
-static int ad5933_reset(struct ad5933_state *st)
-{
- unsigned char dat = st->ctrl_lb | AD5933_CTRL_RESET;
-
- return ad5933_i2c_write(st->client,
- AD5933_REG_CONTROL_LB, 1, &dat);
-}
-
-static int ad5933_wait_busy(struct ad5933_state *st, unsigned char event)
-{
- unsigned char val, timeout = AD5933_MAX_RETRIES;
- int ret;
-
- while (timeout--) {
- ret = ad5933_i2c_read(st->client, AD5933_REG_STATUS, 1, &val);
- if (ret < 0)
- return ret;
- if (val & event)
- return val;
- cpu_relax();
- mdelay(1);
- }
-
- return -EAGAIN;
-}
-
-static int ad5933_set_freq(struct ad5933_state *st,
- unsigned int reg, unsigned long freq)
-{
- unsigned long long freqreg;
- union {
- __be32 d32;
- u8 d8[4];
- } dat;
-
- freqreg = (u64)freq * (u64)(1 << 27);
- do_div(freqreg, st->mclk_hz / 4);
-
- switch (reg) {
- case AD5933_REG_FREQ_START:
- st->freq_start = freq;
- break;
- case AD5933_REG_FREQ_INC:
- st->freq_inc = freq;
- break;
- default:
- return -EINVAL;
- }
-
- dat.d32 = cpu_to_be32(freqreg);
- return ad5933_i2c_write(st->client, reg, 3, &dat.d8[1]);
-}
-
-static int ad5933_setup(struct ad5933_state *st)
-{
- __be16 dat;
- int ret;
-
- ret = ad5933_reset(st);
- if (ret < 0)
- return ret;
-
- ret = ad5933_set_freq(st, AD5933_REG_FREQ_START, 10000);
- if (ret < 0)
- return ret;
-
- ret = ad5933_set_freq(st, AD5933_REG_FREQ_INC, 200);
- if (ret < 0)
- return ret;
-
- st->settling_cycles = 10;
- dat = cpu_to_be16(st->settling_cycles);
-
- ret = ad5933_i2c_write(st->client,
- AD5933_REG_SETTLING_CYCLES,
- 2, (u8 *)&dat);
- if (ret < 0)
- return ret;
-
- st->freq_points = 100;
- dat = cpu_to_be16(st->freq_points);
-
- return ad5933_i2c_write(st->client, AD5933_REG_INC_NUM, 2, (u8 *)&dat);
-}
-
-static void ad5933_calc_out_ranges(struct ad5933_state *st)
-{
- int i;
- unsigned int normalized_3v3[4] = {1980, 198, 383, 970};
-
- for (i = 0; i < 4; i++)
- st->range_avail[i] = normalized_3v3[i] * st->vref_mv / 3300;
-}
-
-/*
- * handles: AD5933_REG_FREQ_START and AD5933_REG_FREQ_INC
- */
-
-static ssize_t ad5933_show_frequency(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5933_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int ret;
- unsigned long long freqreg;
- union {
- __be32 d32;
- u8 d8[4];
- } dat;
-
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
- ret = ad5933_i2c_read(st->client, this_attr->address, 3, &dat.d8[1]);
- iio_device_release_direct_mode(indio_dev);
- if (ret < 0)
- return ret;
-
- freqreg = be32_to_cpu(dat.d32) & 0xFFFFFF;
-
- freqreg = (u64)freqreg * (u64)(st->mclk_hz / 4);
- do_div(freqreg, 1 << 27);
-
- return sprintf(buf, "%d\n", (int)freqreg);
-}
-
-static ssize_t ad5933_store_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 ad5933_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- unsigned long val;
- int ret;
-
- ret = kstrtoul(buf, 10, &val);
- if (ret)
- return ret;
-
- if (val > AD5933_MAX_OUTPUT_FREQ_Hz)
- return -EINVAL;
-
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
- ret = ad5933_set_freq(st, this_attr->address, val);
- iio_device_release_direct_mode(indio_dev);
-
- return ret ? ret : len;
-}
-
-static IIO_DEVICE_ATTR(out_voltage0_freq_start, 0644,
- ad5933_show_frequency,
- ad5933_store_frequency,
- AD5933_REG_FREQ_START);
-
-static IIO_DEVICE_ATTR(out_voltage0_freq_increment, 0644,
- ad5933_show_frequency,
- ad5933_store_frequency,
- AD5933_REG_FREQ_INC);
-
-static ssize_t ad5933_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5933_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int ret = 0, len = 0;
-
- mutex_lock(&st->lock);
- switch ((u32)this_attr->address) {
- case AD5933_OUT_RANGE:
- len = sprintf(buf, "%u\n",
- st->range_avail[(st->ctrl_hb >> 1) & 0x3]);
- break;
- case AD5933_OUT_RANGE_AVAIL:
- len = sprintf(buf, "%u %u %u %u\n", st->range_avail[0],
- st->range_avail[3], st->range_avail[2],
- st->range_avail[1]);
- break;
- case AD5933_OUT_SETTLING_CYCLES:
- len = sprintf(buf, "%d\n", st->settling_cycles);
- break;
- case AD5933_IN_PGA_GAIN:
- len = sprintf(buf, "%s\n",
- (st->ctrl_hb & AD5933_CTRL_PGA_GAIN_1) ?
- "1" : "0.2");
- break;
- case AD5933_IN_PGA_GAIN_AVAIL:
- len = sprintf(buf, "1 0.2\n");
- break;
- case AD5933_FREQ_POINTS:
- len = sprintf(buf, "%d\n", st->freq_points);
- break;
- default:
- ret = -EINVAL;
- }
-
- mutex_unlock(&st->lock);
- return ret ? ret : len;
-}
-
-static ssize_t ad5933_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5933_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- u16 val;
- int i, ret = 0;
- __be16 dat;
-
- if (this_attr->address != AD5933_IN_PGA_GAIN) {
- ret = kstrtou16(buf, 10, &val);
- if (ret)
- return ret;
- }
-
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
- mutex_lock(&st->lock);
- switch ((u32)this_attr->address) {
- case AD5933_OUT_RANGE:
- ret = -EINVAL;
- for (i = 0; i < 4; i++)
- if (val == st->range_avail[i]) {
- st->ctrl_hb &= ~AD5933_CTRL_RANGE(0x3);
- st->ctrl_hb |= AD5933_CTRL_RANGE(i);
- ret = ad5933_cmd(st, 0);
- break;
- }
- break;
- case AD5933_IN_PGA_GAIN:
- if (sysfs_streq(buf, "1")) {
- st->ctrl_hb |= AD5933_CTRL_PGA_GAIN_1;
- } else if (sysfs_streq(buf, "0.2")) {
- st->ctrl_hb &= ~AD5933_CTRL_PGA_GAIN_1;
- } else {
- ret = -EINVAL;
- break;
- }
- ret = ad5933_cmd(st, 0);
- break;
- case AD5933_OUT_SETTLING_CYCLES:
- val = clamp(val, (u16)0, (u16)0x7FF);
- st->settling_cycles = val;
-
- /* 2x, 4x handling, see datasheet */
- if (val > 1022)
- val = (val >> 2) | (3 << 9);
- else if (val > 511)
- val = (val >> 1) | (1 << 9);
-
- dat = cpu_to_be16(val);
- ret = ad5933_i2c_write(st->client,
- AD5933_REG_SETTLING_CYCLES,
- 2, (u8 *)&dat);
- break;
- case AD5933_FREQ_POINTS:
- val = clamp(val, (u16)0, (u16)511);
- st->freq_points = val;
-
- dat = cpu_to_be16(val);
- ret = ad5933_i2c_write(st->client, AD5933_REG_INC_NUM, 2,
- (u8 *)&dat);
- break;
- default:
- ret = -EINVAL;
- }
-
- mutex_unlock(&st->lock);
- iio_device_release_direct_mode(indio_dev);
- return ret ? ret : len;
-}
-
-static IIO_DEVICE_ATTR(out_voltage0_scale, 0644,
- ad5933_show,
- ad5933_store,
- AD5933_OUT_RANGE);
-
-static IIO_DEVICE_ATTR(out_voltage0_scale_available, 0444,
- ad5933_show,
- NULL,
- AD5933_OUT_RANGE_AVAIL);
-
-static IIO_DEVICE_ATTR(in_voltage0_scale, 0644,
- ad5933_show,
- ad5933_store,
- AD5933_IN_PGA_GAIN);
-
-static IIO_DEVICE_ATTR(in_voltage0_scale_available, 0444,
- ad5933_show,
- NULL,
- AD5933_IN_PGA_GAIN_AVAIL);
-
-static IIO_DEVICE_ATTR(out_voltage0_freq_points, 0644,
- ad5933_show,
- ad5933_store,
- AD5933_FREQ_POINTS);
-
-static IIO_DEVICE_ATTR(out_voltage0_settling_cycles, 0644,
- ad5933_show,
- ad5933_store,
- AD5933_OUT_SETTLING_CYCLES);
-
-/*
- * note:
- * ideally we would handle the scale attributes via the iio_info
- * (read|write)_raw methods, however this part is a untypical since we
- * don't create dedicated sysfs channel attributes for out0 and in0.
- */
-static struct attribute *ad5933_attributes[] = {
- &iio_dev_attr_out_voltage0_scale.dev_attr.attr,
- &iio_dev_attr_out_voltage0_scale_available.dev_attr.attr,
- &iio_dev_attr_out_voltage0_freq_start.dev_attr.attr,
- &iio_dev_attr_out_voltage0_freq_increment.dev_attr.attr,
- &iio_dev_attr_out_voltage0_freq_points.dev_attr.attr,
- &iio_dev_attr_out_voltage0_settling_cycles.dev_attr.attr,
- &iio_dev_attr_in_voltage0_scale.dev_attr.attr,
- &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
- NULL
-};
-
-static const struct attribute_group ad5933_attribute_group = {
- .attrs = ad5933_attributes,
-};
-
-static int ad5933_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- struct ad5933_state *st = iio_priv(indio_dev);
- __be16 dat;
- int ret;
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
- ret = ad5933_cmd(st, AD5933_CTRL_MEASURE_TEMP);
- if (ret < 0)
- goto out;
- ret = ad5933_wait_busy(st, AD5933_STAT_TEMP_VALID);
- if (ret < 0)
- goto out;
-
- ret = ad5933_i2c_read(st->client,
- AD5933_REG_TEMP_DATA,
- 2, (u8 *)&dat);
- if (ret < 0)
- goto out;
- iio_device_release_direct_mode(indio_dev);
- *val = sign_extend32(be16_to_cpu(dat), 13);
-
- return IIO_VAL_INT;
- case IIO_CHAN_INFO_SCALE:
- *val = 1000;
- *val2 = 5;
- return IIO_VAL_FRACTIONAL_LOG2;
- }
-
- return -EINVAL;
-out:
- iio_device_release_direct_mode(indio_dev);
- return ret;
-}
-
-static const struct iio_info ad5933_info = {
- .read_raw = ad5933_read_raw,
- .attrs = &ad5933_attribute_group,
-};
-
-static int ad5933_ring_preenable(struct iio_dev *indio_dev)
-{
- struct ad5933_state *st = iio_priv(indio_dev);
- int ret;
-
- if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
- return -EINVAL;
-
- ret = ad5933_reset(st);
- if (ret < 0)
- return ret;
-
- ret = ad5933_cmd(st, AD5933_CTRL_STANDBY);
- if (ret < 0)
- return ret;
-
- ret = ad5933_cmd(st, AD5933_CTRL_INIT_START_FREQ);
- if (ret < 0)
- return ret;
-
- st->state = AD5933_CTRL_INIT_START_FREQ;
-
- return 0;
-}
-
-static int ad5933_ring_postenable(struct iio_dev *indio_dev)
-{
- struct ad5933_state *st = iio_priv(indio_dev);
-
- /*
- * AD5933_CTRL_INIT_START_FREQ:
- * High Q complex circuits require a long time to reach steady state.
- * To facilitate the measurement of such impedances, this mode allows
- * the user full control of the settling time requirement before
- * entering start frequency sweep mode where the impedance measurement
- * takes place. In this mode the impedance is excited with the
- * programmed start frequency (ad5933_ring_preenable),
- * but no measurement takes place.
- */
-
- schedule_delayed_work(&st->work,
- msecs_to_jiffies(AD5933_INIT_EXCITATION_TIME_ms));
- return 0;
-}
-
-static int ad5933_ring_postdisable(struct iio_dev *indio_dev)
-{
- struct ad5933_state *st = iio_priv(indio_dev);
-
- cancel_delayed_work_sync(&st->work);
- return ad5933_cmd(st, AD5933_CTRL_POWER_DOWN);
-}
-
-static const struct iio_buffer_setup_ops ad5933_ring_setup_ops = {
- .preenable = ad5933_ring_preenable,
- .postenable = ad5933_ring_postenable,
- .postdisable = ad5933_ring_postdisable,
-};
-
-static int ad5933_register_ring_funcs_and_init(struct iio_dev *indio_dev)
-{
- struct iio_buffer *buffer;
-
- buffer = iio_kfifo_allocate();
- if (!buffer)
- return -ENOMEM;
-
- iio_device_attach_buffer(indio_dev, buffer);
-
- /* Ring buffer functions - here trigger setup related */
- indio_dev->setup_ops = &ad5933_ring_setup_ops;
-
- return 0;
-}
-
-static void ad5933_work(struct work_struct *work)
-{
- struct ad5933_state *st = container_of(work,
- struct ad5933_state, work.work);
- struct iio_dev *indio_dev = i2c_get_clientdata(st->client);
- __be16 buf[2];
- int val[2];
- unsigned char status;
- int ret;
-
- if (st->state == AD5933_CTRL_INIT_START_FREQ) {
- /* start sweep */
- ad5933_cmd(st, AD5933_CTRL_START_SWEEP);
- st->state = AD5933_CTRL_START_SWEEP;
- schedule_delayed_work(&st->work, st->poll_time_jiffies);
- return;
- }
-
- ret = ad5933_i2c_read(st->client, AD5933_REG_STATUS, 1, &status);
- if (ret)
- return;
-
- if (status & AD5933_STAT_DATA_VALID) {
- int scan_count = bitmap_weight(indio_dev->active_scan_mask,
- indio_dev->masklength);
- ret = ad5933_i2c_read(st->client,
- test_bit(1, indio_dev->active_scan_mask) ?
- AD5933_REG_REAL_DATA : AD5933_REG_IMAG_DATA,
- scan_count * 2, (u8 *)buf);
- if (ret)
- return;
-
- if (scan_count == 2) {
- val[0] = be16_to_cpu(buf[0]);
- val[1] = be16_to_cpu(buf[1]);
- } else {
- val[0] = be16_to_cpu(buf[0]);
- }
- iio_push_to_buffers(indio_dev, val);
- } else {
- /* no data available - try again later */
- schedule_delayed_work(&st->work, st->poll_time_jiffies);
- return;
- }
-
- if (status & AD5933_STAT_SWEEP_DONE) {
- /*
- * last sample received - power down do
- * nothing until the ring enable is toggled
- */
- ad5933_cmd(st, AD5933_CTRL_POWER_DOWN);
- } else {
- /* we just received a valid datum, move on to the next */
- ad5933_cmd(st, AD5933_CTRL_INC_FREQ);
- schedule_delayed_work(&st->work, st->poll_time_jiffies);
- }
-}
-
-static int ad5933_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- int ret;
- struct ad5933_state *st;
- struct iio_dev *indio_dev;
- unsigned long ext_clk_hz = 0;
-
- indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
- if (!indio_dev)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
- i2c_set_clientdata(client, indio_dev);
- st->client = client;
-
- mutex_init(&st->lock);
-
- st->reg = devm_regulator_get(&client->dev, "vdd");
- if (IS_ERR(st->reg))
- return PTR_ERR(st->reg);
-
- ret = regulator_enable(st->reg);
- if (ret) {
- dev_err(&client->dev, "Failed to enable specified VDD supply\n");
- return ret;
- }
- ret = regulator_get_voltage(st->reg);
-
- if (ret < 0)
- goto error_disable_reg;
-
- st->vref_mv = ret / 1000;
-
- st->mclk = devm_clk_get(&client->dev, "mclk");
- if (IS_ERR(st->mclk) && PTR_ERR(st->mclk) != -ENOENT) {
- ret = PTR_ERR(st->mclk);
- goto error_disable_reg;
- }
-
- if (!IS_ERR(st->mclk)) {
- ret = clk_prepare_enable(st->mclk);
- if (ret < 0)
- goto error_disable_reg;
- ext_clk_hz = clk_get_rate(st->mclk);
- }
-
- if (ext_clk_hz) {
- st->mclk_hz = ext_clk_hz;
- st->ctrl_lb = AD5933_CTRL_EXT_SYSCLK;
- } else {
- st->mclk_hz = AD5933_INT_OSC_FREQ_Hz;
- st->ctrl_lb = AD5933_CTRL_INT_SYSCLK;
- }
-
- ad5933_calc_out_ranges(st);
- INIT_DELAYED_WORK(&st->work, ad5933_work);
- st->poll_time_jiffies = msecs_to_jiffies(AD5933_POLL_TIME_ms);
-
- indio_dev->dev.parent = &client->dev;
- indio_dev->info = &ad5933_info;
- indio_dev->name = id->name;
- indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
- indio_dev->channels = ad5933_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad5933_channels);
-
- ret = ad5933_register_ring_funcs_and_init(indio_dev);
- if (ret)
- goto error_disable_mclk;
-
- ret = ad5933_setup(st);
- if (ret)
- goto error_unreg_ring;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_unreg_ring;
-
- return 0;
-
-error_unreg_ring:
- iio_kfifo_free(indio_dev->buffer);
-error_disable_mclk:
- clk_disable_unprepare(st->mclk);
-error_disable_reg:
- regulator_disable(st->reg);
-
- return ret;
-}
-
-static int ad5933_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
- struct ad5933_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- iio_kfifo_free(indio_dev->buffer);
- regulator_disable(st->reg);
- clk_disable_unprepare(st->mclk);
-
- return 0;
-}
-
-static const struct i2c_device_id ad5933_id[] = {
- { "ad5933", 0 },
- { "ad5934", 0 },
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad5933_id);
-
-static const struct of_device_id ad5933_of_match[] = {
- { .compatible = "adi,ad5933" },
- { .compatible = "adi,ad5934" },
- { },
-};
-
-MODULE_DEVICE_TABLE(of, ad5933_of_match);
-
-static struct i2c_driver ad5933_driver = {
- .driver = {
- .name = "ad5933",
- .of_match_table = ad5933_of_match,
- },
- .probe = ad5933_probe,
- .remove = ad5933_remove,
- .id_table = ad5933_id,
-};
-module_i2c_driver(ad5933_driver);
-
-MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
-MODULE_DESCRIPTION("Analog Devices AD5933 Impedance Conv. Network Analyzer");
-MODULE_LICENSE("GPL v2");
--
2.20.1
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