--- /dev/null
+ /*
+ * iio/adc/max1363.c
+ * 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
+ *
+ * Driver for max1363 and similar chips.
+ *
+ * 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.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.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 <linux/iio/driver.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define MAX1363_SETUP_BYTE(a) ((a) | 0x80)
+
+/* There is a fair bit more defined here than currently
+ * used, but the intention is to support everything these
+ * chips do in the long run */
+
+/* see data sheets */
+/* max1363 and max1236, max1237, max1238, max1239 */
+#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD 0x00
+#define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF 0x20
+#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT 0x40
+#define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT 0x60
+#define MAX1363_SETUP_POWER_UP_INT_REF 0x10
+#define MAX1363_SETUP_POWER_DOWN_INT_REF 0x00
+
+/* think about including max11600 etc - more settings */
+#define MAX1363_SETUP_EXT_CLOCK 0x08
+#define MAX1363_SETUP_INT_CLOCK 0x00
+#define MAX1363_SETUP_UNIPOLAR 0x00
+#define MAX1363_SETUP_BIPOLAR 0x04
+#define MAX1363_SETUP_RESET 0x00
+#define MAX1363_SETUP_NORESET 0x02
+/* max1363 only - though don't care on others.
+ * For now monitor modes are not implemented as the relevant
+ * line is not connected on my test board.
+ * The definitions are here as I intend to add this soon.
+ */
+#define MAX1363_SETUP_MONITOR_SETUP 0x01
+
+/* Specific to the max1363 */
+#define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
+#define MAX1363_MON_INT_ENABLE 0x01
+
+/* defined for readability reasons */
+/* All chips */
+#define MAX1363_CONFIG_BYTE(a) ((a))
+
+#define MAX1363_CONFIG_SE 0x01
+#define MAX1363_CONFIG_DE 0x00
+#define MAX1363_CONFIG_SCAN_TO_CS 0x00
+#define MAX1363_CONFIG_SCAN_SINGLE_8 0x20
+#define MAX1363_CONFIG_SCAN_MONITOR_MODE 0x40
+#define MAX1363_CONFIG_SCAN_SINGLE_1 0x60
+/* max123{6-9} only */
+#define MAX1236_SCAN_MID_TO_CHANNEL 0x40
+
+/* max1363 only - merely part of channel selects or don't care for others */
+#define MAX1363_CONFIG_EN_MON_MODE_READ 0x18
+
+#define MAX1363_CHANNEL_SEL(a) ((a) << 1)
+
+/* max1363 strictly 0x06 - but doesn't matter */
+#define MAX1363_CHANNEL_SEL_MASK 0x1E
+#define MAX1363_SCAN_MASK 0x60
+#define MAX1363_SE_DE_MASK 0x01
+
+#define MAX1363_MAX_CHANNELS 25
+/**
+ * struct max1363_mode - scan mode information
+ * @conf: The corresponding value of the configuration register
+ * @modemask: Bit mask corresponding to channels enabled in this mode
+ */
+struct max1363_mode {
+ int8_t conf;
+ DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
+};
+
+/* This must be maintained along side the max1363_mode_table in max1363_core */
+enum max1363_modes {
+ /* Single read of a single channel */
+ _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
+ /* Differential single read */
+ d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
+ d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
+ /* Scan to channel and mid to channel where overlapping */
+ s0to1, s0to2, s2to3, s0to3, s0to4, s0to5, s0to6,
+ s6to7, s0to7, s6to8, s0to8, s6to9,
+ s0to9, s6to10, s0to10, s6to11, s0to11,
+ /* Differential scan to channel and mid to channel where overlapping */
+ d0m1to2m3, d0m1to4m5, d0m1to6m7, d6m7to8m9,
+ d0m1to8m9, d6m7to10m11, d0m1to10m11, d1m0to3m2,
+ d1m0to5m4, d1m0to7m6, d7m6to9m8, d1m0to9m8,
+ d7m6to11m10, d1m0to11m10,
+};
+
+/**
+ * struct max1363_chip_info - chip specifc information
+ * @info: iio core function callbacks structure
+ * @channels: channel specification
+ * @num_channels: number of channels
+ * @mode_list: array of available scan modes
+ * @default_mode: the scan mode in which the chip starts up
+ * @int_vref_mv: the internal reference voltage
+ * @num_modes: number of modes
+ * @bits: accuracy of the adc in bits
+ */
+struct max1363_chip_info {
+ const struct iio_info *info;
+ const struct iio_chan_spec *channels;
+ int num_channels;
+ const enum max1363_modes *mode_list;
+ enum max1363_modes default_mode;
+ u16 int_vref_mv;
+ u8 num_modes;
+ u8 bits;
+};
+
+/**
+ * struct max1363_state - driver instance specific data
+ * @client: i2c_client
+ * @setupbyte: cache of current device setup byte
+ * @configbyte: cache of current device config byte
+ * @chip_info: chip model specific constants, available modes, etc.
+ * @current_mode: the scan mode of this chip
+ * @requestedmask: a valid requested set of channels
+ * @reg: supply regulator
+ * @monitor_on: whether monitor mode is enabled
+ * @monitor_speed: parameter corresponding to device monitor speed setting
+ * @mask_high: bitmask for enabled high thresholds
+ * @mask_low: bitmask for enabled low thresholds
+ * @thresh_high: high threshold values
+ * @thresh_low: low threshold values
+ * @vref: Reference voltage regulator
+ * @vref_uv: Actual (external or internal) reference voltage
+ * @send: function used to send data to the chip
+ * @recv: function used to receive data from the chip
+ */
+struct max1363_state {
+ struct i2c_client *client;
+ u8 setupbyte;
+ u8 configbyte;
+ const struct max1363_chip_info *chip_info;
+ const struct max1363_mode *current_mode;
+ u32 requestedmask;
+ struct regulator *reg;
+
+ /* Using monitor modes and buffer at the same time is
+ currently not supported */
+ bool monitor_on;
+ unsigned int monitor_speed:3;
+ u8 mask_high;
+ u8 mask_low;
+ /* 4x unipolar first then the fours bipolar ones */
+ s16 thresh_high[8];
+ s16 thresh_low[8];
+ struct regulator *vref;
+ u32 vref_uv;
+ int (*send)(const struct i2c_client *client,
+ const char *buf, int count);
+ int (*recv)(const struct i2c_client *client,
+ char *buf, int count);
+};
+
+#define MAX1363_MODE_SINGLE(_num, _mask) { \
+ .conf = MAX1363_CHANNEL_SEL(_num) \
+ | MAX1363_CONFIG_SCAN_SINGLE_1 \
+ | MAX1363_CONFIG_SE, \
+ .modemask[0] = _mask, \
+ }
+
+#define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) { \
+ .conf = MAX1363_CHANNEL_SEL(_num) \
+ | MAX1363_CONFIG_SCAN_TO_CS \
+ | MAX1363_CONFIG_SE, \
+ .modemask[0] = _mask, \
+ }
+
+/* note not available for max1363 hence naming */
+#define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num, _mask) { \
+ .conf = MAX1363_CHANNEL_SEL(_num) \
+ | MAX1236_SCAN_MID_TO_CHANNEL \
+ | MAX1363_CONFIG_SE, \
+ .modemask[0] = _mask \
+}
+
+#define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) { \
+ .conf = MAX1363_CHANNEL_SEL(_nump) \
+ | MAX1363_CONFIG_SCAN_SINGLE_1 \
+ | MAX1363_CONFIG_DE, \
+ .modemask[0] = _mask \
+ }
+
+/* Can't think how to automate naming so specify for now */
+#define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(_num, _numvals, _mask) { \
+ .conf = MAX1363_CHANNEL_SEL(_num) \
+ | MAX1363_CONFIG_SCAN_TO_CS \
+ | MAX1363_CONFIG_DE, \
+ .modemask[0] = _mask \
+ }
+
+/* note only available for max1363 hence naming */
+#define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(_num, _numvals, _mask) { \
+ .conf = MAX1363_CHANNEL_SEL(_num) \
+ | MAX1236_SCAN_MID_TO_CHANNEL \
+ | MAX1363_CONFIG_SE, \
+ .modemask[0] = _mask \
+}
+
+static const struct max1363_mode max1363_mode_table[] = {
+ /* All of the single channel options first */
+ MAX1363_MODE_SINGLE(0, 1 << 0),
+ MAX1363_MODE_SINGLE(1, 1 << 1),
+ MAX1363_MODE_SINGLE(2, 1 << 2),
+ MAX1363_MODE_SINGLE(3, 1 << 3),
+ MAX1363_MODE_SINGLE(4, 1 << 4),
+ MAX1363_MODE_SINGLE(5, 1 << 5),
+ MAX1363_MODE_SINGLE(6, 1 << 6),
+ MAX1363_MODE_SINGLE(7, 1 << 7),
+ MAX1363_MODE_SINGLE(8, 1 << 8),
+ MAX1363_MODE_SINGLE(9, 1 << 9),
+ MAX1363_MODE_SINGLE(10, 1 << 10),
+ MAX1363_MODE_SINGLE(11, 1 << 11),
+
+ MAX1363_MODE_DIFF_SINGLE(0, 1, 1 << 12),
+ MAX1363_MODE_DIFF_SINGLE(2, 3, 1 << 13),
+ MAX1363_MODE_DIFF_SINGLE(4, 5, 1 << 14),
+ MAX1363_MODE_DIFF_SINGLE(6, 7, 1 << 15),
+ MAX1363_MODE_DIFF_SINGLE(8, 9, 1 << 16),
+ MAX1363_MODE_DIFF_SINGLE(10, 11, 1 << 17),
+ MAX1363_MODE_DIFF_SINGLE(1, 0, 1 << 18),
+ MAX1363_MODE_DIFF_SINGLE(3, 2, 1 << 19),
+ MAX1363_MODE_DIFF_SINGLE(5, 4, 1 << 20),
+ MAX1363_MODE_DIFF_SINGLE(7, 6, 1 << 21),
+ MAX1363_MODE_DIFF_SINGLE(9, 8, 1 << 22),
+ MAX1363_MODE_DIFF_SINGLE(11, 10, 1 << 23),
+
+ /* The multichannel scans next */
+ MAX1363_MODE_SCAN_TO_CHANNEL(1, 0x003),
+ MAX1363_MODE_SCAN_TO_CHANNEL(2, 0x007),
+ MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3, 0x00C),
+ MAX1363_MODE_SCAN_TO_CHANNEL(3, 0x00F),
+ MAX1363_MODE_SCAN_TO_CHANNEL(4, 0x01F),
+ MAX1363_MODE_SCAN_TO_CHANNEL(5, 0x03F),
+ MAX1363_MODE_SCAN_TO_CHANNEL(6, 0x07F),
+ MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7, 0x0C0),
+ MAX1363_MODE_SCAN_TO_CHANNEL(7, 0x0FF),
+ MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8, 0x1C0),
+ MAX1363_MODE_SCAN_TO_CHANNEL(8, 0x1FF),
+ MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9, 0x3C0),
+ MAX1363_MODE_SCAN_TO_CHANNEL(9, 0x3FF),
+ MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10, 0x7C0),
+ MAX1363_MODE_SCAN_TO_CHANNEL(10, 0x7FF),
+ MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11, 0xFC0),
+ MAX1363_MODE_SCAN_TO_CHANNEL(11, 0xFFF),
+
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(2, 2, 0x003000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(4, 3, 0x007000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(6, 4, 0x00F000),
+ MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(8, 2, 0x018000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(8, 5, 0x01F000),
+ MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(10, 3, 0x038000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(10, 6, 0x3F000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(3, 2, 0x0C0000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(5, 3, 0x1C0000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(7, 4, 0x3C0000),
+ MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(9, 2, 0x600000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(9, 5, 0x7C0000),
+ MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(11, 3, 0xE00000),
+ MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(11, 6, 0xFC0000),
+};
+
+static const struct max1363_mode
+*max1363_match_mode(const unsigned long *mask,
+ const struct max1363_chip_info *ci)
+{
+ int i;
+ if (mask)
+ for (i = 0; i < ci->num_modes; i++)
+ if (bitmap_subset(mask,
+ max1363_mode_table[ci->mode_list[i]].
+ modemask,
+ MAX1363_MAX_CHANNELS))
+ return &max1363_mode_table[ci->mode_list[i]];
+ return NULL;
+}
+
+static int max1363_smbus_send(const struct i2c_client *client, const char *buf,
+ int count)
+{
+ int i, err;
+
+ for (i = err = 0; err == 0 && i < count; ++i)
+ err = i2c_smbus_write_byte(client, buf[i]);
+
+ return err ? err : count;
+}
+
+static int max1363_smbus_recv(const struct i2c_client *client, char *buf,
+ int count)
+{
+ int i, ret;
+
+ for (i = 0; i < count; ++i) {
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0)
+ return ret;
+ buf[i] = ret;
+ }
+
+ return count;
+}
+
+static int max1363_write_basic_config(struct max1363_state *st)
+{
+ u8 tx_buf[2] = { st->setupbyte, st->configbyte };
+
+ return st->send(st->client, tx_buf, 2);
+}
+
+static int max1363_set_scan_mode(struct max1363_state *st)
+{
+ st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
+ | MAX1363_SCAN_MASK
+ | MAX1363_SE_DE_MASK);
+ st->configbyte |= st->current_mode->conf;
+
+ return max1363_write_basic_config(st);
+}
+
+static int max1363_read_single_chan(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ long m)
+{
+ int ret = 0;
+ s32 data;
+ u8 rxbuf[2];
+ struct max1363_state *st = iio_priv(indio_dev);
+ struct i2c_client *client = st->client;
+
+ mutex_lock(&indio_dev->mlock);
+ /*
+ * If monitor mode is enabled, the method for reading a single
+ * channel will have to be rather different and has not yet
+ * been implemented.
+ *
+ * Also, cannot read directly if buffered capture enabled.
+ */
+ if (st->monitor_on || iio_buffer_enabled(indio_dev)) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+
+ /* Check to see if current scan mode is correct */
+ if (st->current_mode != &max1363_mode_table[chan->address]) {
+ /* Update scan mode if needed */
+ st->current_mode = &max1363_mode_table[chan->address];
+ ret = max1363_set_scan_mode(st);
+ if (ret < 0)
+ goto error_ret;
+ }
+ if (st->chip_info->bits != 8) {
+ /* Get reading */
+ data = st->recv(client, rxbuf, 2);
+ if (data < 0) {
+ ret = data;
+ goto error_ret;
+ }
+ data = (rxbuf[1] | rxbuf[0] << 8) &
+ ((1 << st->chip_info->bits) - 1);
+ } else {
+ /* Get reading */
+ data = st->recv(client, rxbuf, 1);
+ if (data < 0) {
+ ret = data;
+ goto error_ret;
+ }
+ data = rxbuf[0];
+ }
+ *val = data;
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+
+}
+
+static int max1363_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct max1363_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ ret = max1363_read_single_chan(indio_dev, chan, val, m);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = st->vref_uv / 1000;
+ *val2 = st->chip_info->bits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* Applies to max1363 */
+static const enum max1363_modes max1363_mode_list[] = {
+ _s0, _s1, _s2, _s3,
+ s0to1, s0to2, s0to3,
+ d0m1, d2m3, d1m0, d3m2,
+ d0m1to2m3, d1m0to3m2,
+};
+
+static const struct iio_event_spec max1363_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),
+ },
+};
+
+#define MAX1363_CHAN_U(num, addr, si, bits, ev_spec, num_ev_spec) \
+ { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = num, \
+ .address = addr, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .datasheet_name = "AIN"#num, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = bits, \
+ .storagebits = (bits > 8) ? 16 : 8, \
+ .endianness = IIO_BE, \
+ }, \
+ .scan_index = si, \
+ .event_spec = ev_spec, \
+ .num_event_specs = num_ev_spec, \
+ }
+
+/* bipolar channel */
+#define MAX1363_CHAN_B(num, num2, addr, si, bits, ev_spec, num_ev_spec) \
+ { \
+ .type = IIO_VOLTAGE, \
+ .differential = 1, \
+ .indexed = 1, \
+ .channel = num, \
+ .channel2 = num2, \
+ .address = addr, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .datasheet_name = "AIN"#num"-AIN"#num2, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = bits, \
+ .storagebits = (bits > 8) ? 16 : 8, \
+ .endianness = IIO_BE, \
+ }, \
+ .scan_index = si, \
+ .event_spec = ev_spec, \
+ .num_event_specs = num_ev_spec, \
+ }
+
+#define MAX1363_4X_CHANS(bits, ev_spec, num_ev_spec) { \
+ MAX1363_CHAN_U(0, _s0, 0, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_U(1, _s1, 1, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_U(2, _s2, 2, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_U(3, _s3, 3, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_B(0, 1, d0m1, 4, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_B(2, 3, d2m3, 5, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_B(1, 0, d1m0, 6, bits, ev_spec, num_ev_spec), \
+ MAX1363_CHAN_B(3, 2, d3m2, 7, bits, ev_spec, num_ev_spec), \
+ IIO_CHAN_SOFT_TIMESTAMP(8) \
+ }
+
+static const struct iio_chan_spec max1036_channels[] =
+ MAX1363_4X_CHANS(8, NULL, 0);
+static const struct iio_chan_spec max1136_channels[] =
+ MAX1363_4X_CHANS(10, NULL, 0);
+static const struct iio_chan_spec max1236_channels[] =
+ MAX1363_4X_CHANS(12, NULL, 0);
+static const struct iio_chan_spec max1361_channels[] =
+ MAX1363_4X_CHANS(10, max1363_events, ARRAY_SIZE(max1363_events));
+static const struct iio_chan_spec max1363_channels[] =
+ MAX1363_4X_CHANS(12, max1363_events, ARRAY_SIZE(max1363_events));
+
+/* Applies to max1236, max1237 */
+static const enum max1363_modes max1236_mode_list[] = {
+ _s0, _s1, _s2, _s3,
+ s0to1, s0to2, s0to3,
+ d0m1, d2m3, d1m0, d3m2,
+ d0m1to2m3, d1m0to3m2,
+ s2to3,
+};
+
+/* Applies to max1238, max1239 */
+static const enum max1363_modes max1238_mode_list[] = {
+ _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
+ s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
+ s0to7, s0to8, s0to9, s0to10, s0to11,
+ d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
+ d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
+ d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
+ d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
+ s6to7, s6to8, s6to9, s6to10, s6to11,
+ d6m7to8m9, d6m7to10m11, d7m6to9m8, d7m6to11m10,
+};
+
+#define MAX1363_12X_CHANS(bits) { \
+ MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
+ MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
+ MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
+ MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
+ MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
+ MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
+ MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
+ MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
+ MAX1363_CHAN_U(8, _s8, 8, bits, NULL, 0), \
+ MAX1363_CHAN_U(9, _s9, 9, bits, NULL, 0), \
+ MAX1363_CHAN_U(10, _s10, 10, bits, NULL, 0), \
+ MAX1363_CHAN_U(11, _s11, 11, bits, NULL, 0), \
+ MAX1363_CHAN_B(0, 1, d0m1, 12, bits, NULL, 0), \
+ MAX1363_CHAN_B(2, 3, d2m3, 13, bits, NULL, 0), \
+ MAX1363_CHAN_B(4, 5, d4m5, 14, bits, NULL, 0), \
+ MAX1363_CHAN_B(6, 7, d6m7, 15, bits, NULL, 0), \
+ MAX1363_CHAN_B(8, 9, d8m9, 16, bits, NULL, 0), \
+ MAX1363_CHAN_B(10, 11, d10m11, 17, bits, NULL, 0), \
+ MAX1363_CHAN_B(1, 0, d1m0, 18, bits, NULL, 0), \
+ MAX1363_CHAN_B(3, 2, d3m2, 19, bits, NULL, 0), \
+ MAX1363_CHAN_B(5, 4, d5m4, 20, bits, NULL, 0), \
+ MAX1363_CHAN_B(7, 6, d7m6, 21, bits, NULL, 0), \
+ MAX1363_CHAN_B(9, 8, d9m8, 22, bits, NULL, 0), \
+ MAX1363_CHAN_B(11, 10, d11m10, 23, bits, NULL, 0), \
+ IIO_CHAN_SOFT_TIMESTAMP(24) \
+ }
+static const struct iio_chan_spec max1038_channels[] = MAX1363_12X_CHANS(8);
+static const struct iio_chan_spec max1138_channels[] = MAX1363_12X_CHANS(10);
+static const struct iio_chan_spec max1238_channels[] = MAX1363_12X_CHANS(12);
+
+static const enum max1363_modes max11607_mode_list[] = {
+ _s0, _s1, _s2, _s3,
+ s0to1, s0to2, s0to3,
+ s2to3,
+ d0m1, d2m3, d1m0, d3m2,
+ d0m1to2m3, d1m0to3m2,
+};
+
+static const enum max1363_modes max11608_mode_list[] = {
+ _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7,
+ s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, s0to7,
+ s6to7,
+ d0m1, d2m3, d4m5, d6m7,
+ d1m0, d3m2, d5m4, d7m6,
+ d0m1to2m3, d0m1to4m5, d0m1to6m7,
+ d1m0to3m2, d1m0to5m4, d1m0to7m6,
+};
+
+#define MAX1363_8X_CHANS(bits) { \
+ MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
+ MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
+ MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
+ MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
+ MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
+ MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
+ MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
+ MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
+ MAX1363_CHAN_B(0, 1, d0m1, 8, bits, NULL, 0), \
+ MAX1363_CHAN_B(2, 3, d2m3, 9, bits, NULL, 0), \
+ MAX1363_CHAN_B(4, 5, d4m5, 10, bits, NULL, 0), \
+ MAX1363_CHAN_B(6, 7, d6m7, 11, bits, NULL, 0), \
+ MAX1363_CHAN_B(1, 0, d1m0, 12, bits, NULL, 0), \
+ MAX1363_CHAN_B(3, 2, d3m2, 13, bits, NULL, 0), \
+ MAX1363_CHAN_B(5, 4, d5m4, 14, bits, NULL, 0), \
+ MAX1363_CHAN_B(7, 6, d7m6, 15, bits, NULL, 0), \
+ IIO_CHAN_SOFT_TIMESTAMP(16) \
+}
+static const struct iio_chan_spec max11602_channels[] = MAX1363_8X_CHANS(8);
+static const struct iio_chan_spec max11608_channels[] = MAX1363_8X_CHANS(10);
+static const struct iio_chan_spec max11614_channels[] = MAX1363_8X_CHANS(12);
+
+static const enum max1363_modes max11644_mode_list[] = {
+ _s0, _s1, s0to1, d0m1, d1m0,
+};
+
+#define MAX1363_2X_CHANS(bits) { \
+ MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
+ MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
+ MAX1363_CHAN_B(0, 1, d0m1, 2, bits, NULL, 0), \
+ MAX1363_CHAN_B(1, 0, d1m0, 3, bits, NULL, 0), \
+ IIO_CHAN_SOFT_TIMESTAMP(4) \
+ }
+
+static const struct iio_chan_spec max11646_channels[] = MAX1363_2X_CHANS(10);
+static const struct iio_chan_spec max11644_channels[] = MAX1363_2X_CHANS(12);
+
+enum { max1361,
+ max1362,
+ max1363,
+ max1364,
+ max1036,
+ max1037,
+ max1038,
+ max1039,
+ max1136,
+ max1137,
+ max1138,
+ max1139,
+ max1236,
+ max1237,
+ max1238,
+ max1239,
+ max11600,
+ max11601,
+ max11602,
+ max11603,
+ max11604,
+ max11605,
+ max11606,
+ max11607,
+ max11608,
+ max11609,
+ max11610,
+ max11611,
+ max11612,
+ max11613,
+ max11614,
+ max11615,
+ max11616,
+ max11617,
+ max11644,
+ max11645,
+ max11646,
+ max11647
+};
+
+static const int max1363_monitor_speeds[] = { 133000, 665000, 33300, 16600,
+ 8300, 4200, 2000, 1000 };
+
+static ssize_t max1363_monitor_show_freq(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct max1363_state *st = iio_priv(dev_to_iio_dev(dev));
+ return sprintf(buf, "%d\n", max1363_monitor_speeds[st->monitor_speed]);
+}
+
+static ssize_t max1363_monitor_store_freq(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct max1363_state *st = iio_priv(indio_dev);
+ int i, ret;
+ unsigned long val;
+ bool found = false;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret)
+ return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(max1363_monitor_speeds); i++)
+ if (val == max1363_monitor_speeds[i]) {
+ found = true;
+ break;
+ }
+ if (!found)
+ return -EINVAL;
+
+ mutex_lock(&indio_dev->mlock);
+ st->monitor_speed = i;
+ mutex_unlock(&indio_dev->mlock);
+
+ return 0;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
+ max1363_monitor_show_freq,
+ max1363_monitor_store_freq);
+
+static IIO_CONST_ATTR(sampling_frequency_available,
+ "133000 665000 33300 16600 8300 4200 2000 1000");
+
+static int max1363_read_thresh(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, enum iio_event_info info, int *val,
+ int *val2)
+{
+ struct max1363_state *st = iio_priv(indio_dev);
+ if (dir == IIO_EV_DIR_FALLING)
+ *val = st->thresh_low[chan->channel];
+ else
+ *val = st->thresh_high[chan->channel];
+ return IIO_VAL_INT;
+}
+
+static int max1363_write_thresh(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, enum iio_event_info info, int val,
+ int val2)
+{
+ struct max1363_state *st = iio_priv(indio_dev);
+ /* make it handle signed correctly as well */
+ switch (st->chip_info->bits) {
+ case 10:
+ if (val > 0x3FF)
+ return -EINVAL;
+ break;
+ case 12:
+ if (val > 0xFFF)
+ return -EINVAL;
+ break;
+ }
+
+ switch (dir) {
+ case IIO_EV_DIR_FALLING:
+ st->thresh_low[chan->channel] = val;
+ break;
+ case IIO_EV_DIR_RISING:
+ st->thresh_high[chan->channel] = val;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const u64 max1363_event_codes[] = {
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
+ IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
+};
+
+static irqreturn_t max1363_event_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct max1363_state *st = iio_priv(indio_dev);
+ s64 timestamp = iio_get_time_ns();
+ unsigned long mask, loc;
+ u8 rx;
+ u8 tx[2] = { st->setupbyte,
+ MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };
+
+ st->recv(st->client, &rx, 1);
+ mask = rx;
+ for_each_set_bit(loc, &mask, 8)
+ iio_push_event(indio_dev, max1363_event_codes[loc], timestamp);
+ st->send(st->client, tx, 2);
+
+ return IRQ_HANDLED;
+}
+
+static int max1363_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct max1363_state *st = iio_priv(indio_dev);
+ int val;
+ int number = chan->channel;
+
+ mutex_lock(&indio_dev->mlock);
+ if (dir == IIO_EV_DIR_FALLING)
+ val = (1 << number) & st->mask_low;
+ else
+ val = (1 << number) & st->mask_high;
+ mutex_unlock(&indio_dev->mlock);
+
+ return val;
+}
+
+static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
+{
+ u8 *tx_buf;
+ int ret, i = 3, j;
+ unsigned long numelements;
+ int len;
+ const long *modemask;
+
+ if (!enabled) {
+ /* transition to buffered capture is not currently supported */
+ st->setupbyte &= ~MAX1363_SETUP_MONITOR_SETUP;
+ st->configbyte &= ~MAX1363_SCAN_MASK;
+ st->monitor_on = false;
+ return max1363_write_basic_config(st);
+ }
+
+ /* Ensure we are in the relevant mode */
+ st->setupbyte |= MAX1363_SETUP_MONITOR_SETUP;
+ st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
+ | MAX1363_SCAN_MASK
+ | MAX1363_SE_DE_MASK);
+ st->configbyte |= MAX1363_CONFIG_SCAN_MONITOR_MODE;
+ if ((st->mask_low | st->mask_high) & 0x0F) {
+ st->configbyte |= max1363_mode_table[s0to3].conf;
+ modemask = max1363_mode_table[s0to3].modemask;
+ } else if ((st->mask_low | st->mask_high) & 0x30) {
+ st->configbyte |= max1363_mode_table[d0m1to2m3].conf;
+ modemask = max1363_mode_table[d0m1to2m3].modemask;
+ } else {
+ st->configbyte |= max1363_mode_table[d1m0to3m2].conf;
+ modemask = max1363_mode_table[d1m0to3m2].modemask;
+ }
+ numelements = bitmap_weight(modemask, MAX1363_MAX_CHANNELS);
+ len = 3 * numelements + 3;
+ tx_buf = kmalloc(len, GFP_KERNEL);
+ if (!tx_buf) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ tx_buf[0] = st->configbyte;
+ tx_buf[1] = st->setupbyte;
+ tx_buf[2] = (st->monitor_speed << 1);
+
+ /*
+ * So we need to do yet another bit of nefarious scan mode
+ * setup to match what we need.
+ */
+ for (j = 0; j < 8; j++)
+ if (test_bit(j, modemask)) {
+ /* Establish the mode is in the scan */
+ if (st->mask_low & (1 << j)) {
+ tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;
+ tx_buf[i + 1] = (st->thresh_low[j] << 4) & 0xF0;
+ } else if (j < 4) {
+ tx_buf[i] = 0;
+ tx_buf[i + 1] = 0;
+ } else {
+ tx_buf[i] = 0x80;
+ tx_buf[i + 1] = 0;
+ }
+ if (st->mask_high & (1 << j)) {
+ tx_buf[i + 1] |=
+ (st->thresh_high[j] >> 8) & 0x0F;
+ tx_buf[i + 2] = st->thresh_high[j] & 0xFF;
+ } else if (j < 4) {
+ tx_buf[i + 1] |= 0x0F;
+ tx_buf[i + 2] = 0xFF;
+ } else {
+ tx_buf[i + 1] |= 0x07;
+ tx_buf[i + 2] = 0xFF;
+ }
+ i += 3;
+ }
+
+
+ ret = st->send(st->client, tx_buf, len);
+ if (ret < 0)
+ goto error_ret;
+ if (ret != len) {
+ ret = -EIO;
+ goto error_ret;
+ }
+
+ /*
+ * Now that we hopefully have sensible thresholds in place it is
+ * time to turn the interrupts on.
+ * It is unclear from the data sheet if this should be necessary
+ * (i.e. whether monitor mode setup is atomic) but it appears to
+ * be in practice.
+ */
+ tx_buf[0] = st->setupbyte;
+ tx_buf[1] = MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0;
+ ret = st->send(st->client, tx_buf, 2);
+ if (ret < 0)
+ goto error_ret;
+ if (ret != 2) {
+ ret = -EIO;
+ goto error_ret;
+ }
+ ret = 0;
+ st->monitor_on = true;
+error_ret:
+
+ kfree(tx_buf);
+
+ return ret;
+}
+
+/*
+ * To keep this manageable we always use one of 3 scan modes.
+ * Scan 0...3, 0-1,2-3 and 1-0,3-2
+ */
+
+static inline int __max1363_check_event_mask(int thismask, int checkmask)
+{
+ int ret = 0;
+ /* Is it unipolar */
+ if (thismask < 4) {
+ if (checkmask & ~0x0F) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ } else if (thismask < 6) {
+ if (checkmask & ~0x30) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ } else if (checkmask & ~0xC0)
+ ret = -EBUSY;
+error_ret:
+ return ret;
+}
+
+static int max1363_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, int state)
+{
+ int ret = 0;
+ struct max1363_state *st = iio_priv(indio_dev);
+ u16 unifiedmask;
+ int number = chan->channel;
+
+ mutex_lock(&indio_dev->mlock);
+ unifiedmask = st->mask_low | st->mask_high;
+ if (dir == IIO_EV_DIR_FALLING) {
+
+ if (state == 0)
+ st->mask_low &= ~(1 << number);
+ else {
+ ret = __max1363_check_event_mask((1 << number),
+ unifiedmask);
+ if (ret)
+ goto error_ret;
+ st->mask_low |= (1 << number);
+ }
+ } else {
+ if (state == 0)
+ st->mask_high &= ~(1 << number);
+ else {
+ ret = __max1363_check_event_mask((1 << number),
+ unifiedmask);
+ if (ret)
+ goto error_ret;
+ st->mask_high |= (1 << number);
+ }
+ }
+
+ max1363_monitor_mode_update(st, !!(st->mask_high | st->mask_low));
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
+/*
+ * As with scan_elements, only certain sets of these can
+ * be combined.
+ */
+static struct attribute *max1363_event_attributes[] = {
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group max1363_event_attribute_group = {
+ .attrs = max1363_event_attributes,
+ .name = "events",
+};
+
+static int max1363_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct max1363_state *st = iio_priv(indio_dev);
+
+ /*
+ * Need to figure out the current mode based upon the requested
+ * scan mask in iio_dev
+ */
+ st->current_mode = max1363_match_mode(scan_mask, st->chip_info);
+ if (!st->current_mode)
+ return -EINVAL;
+ max1363_set_scan_mode(st);
+ return 0;
+}
+
+static const struct iio_info max1238_info = {
+ .read_raw = &max1363_read_raw,
+ .driver_module = THIS_MODULE,
+ .update_scan_mode = &max1363_update_scan_mode,
+};
+
+static const struct iio_info max1363_info = {
+ .read_event_value = &max1363_read_thresh,
+ .write_event_value = &max1363_write_thresh,
+ .read_event_config = &max1363_read_event_config,
+ .write_event_config = &max1363_write_event_config,
+ .read_raw = &max1363_read_raw,
+ .update_scan_mode = &max1363_update_scan_mode,
+ .driver_module = THIS_MODULE,
+ .event_attrs = &max1363_event_attribute_group,
+};
+
+/* max1363 and max1368 tested - rest from data sheet */
+static const struct max1363_chip_info max1363_chip_info_tbl[] = {
+ [max1361] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max1363_mode_list,
+ .num_modes = ARRAY_SIZE(max1363_mode_list),
+ .default_mode = s0to3,
+ .channels = max1361_channels,
+ .num_channels = ARRAY_SIZE(max1361_channels),
+ .info = &max1363_info,
+ },
+ [max1362] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max1363_mode_list,
+ .num_modes = ARRAY_SIZE(max1363_mode_list),
+ .default_mode = s0to3,
+ .channels = max1361_channels,
+ .num_channels = ARRAY_SIZE(max1361_channels),
+ .info = &max1363_info,
+ },
+ [max1363] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max1363_mode_list,
+ .num_modes = ARRAY_SIZE(max1363_mode_list),
+ .default_mode = s0to3,
+ .channels = max1363_channels,
+ .num_channels = ARRAY_SIZE(max1363_channels),
+ .info = &max1363_info,
+ },
+ [max1364] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max1363_mode_list,
+ .num_modes = ARRAY_SIZE(max1363_mode_list),
+ .default_mode = s0to3,
+ .channels = max1363_channels,
+ .num_channels = ARRAY_SIZE(max1363_channels),
+ .info = &max1363_info,
+ },
+ [max1036] = {
+ .bits = 8,
+ .int_vref_mv = 4096,
+ .mode_list = max1236_mode_list,
+ .num_modes = ARRAY_SIZE(max1236_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1036_channels,
+ .num_channels = ARRAY_SIZE(max1036_channels),
+ },
+ [max1037] = {
+ .bits = 8,
+ .int_vref_mv = 2048,
+ .mode_list = max1236_mode_list,
+ .num_modes = ARRAY_SIZE(max1236_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1036_channels,
+ .num_channels = ARRAY_SIZE(max1036_channels),
+ },
+ [max1038] = {
+ .bits = 8,
+ .int_vref_mv = 4096,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1038_channels,
+ .num_channels = ARRAY_SIZE(max1038_channels),
+ },
+ [max1039] = {
+ .bits = 8,
+ .int_vref_mv = 2048,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1038_channels,
+ .num_channels = ARRAY_SIZE(max1038_channels),
+ },
+ [max1136] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max1236_mode_list,
+ .num_modes = ARRAY_SIZE(max1236_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1136_channels,
+ .num_channels = ARRAY_SIZE(max1136_channels),
+ },
+ [max1137] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max1236_mode_list,
+ .num_modes = ARRAY_SIZE(max1236_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1136_channels,
+ .num_channels = ARRAY_SIZE(max1136_channels),
+ },
+ [max1138] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1138_channels,
+ .num_channels = ARRAY_SIZE(max1138_channels),
+ },
+ [max1139] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1138_channels,
+ .num_channels = ARRAY_SIZE(max1138_channels),
+ },
+ [max1236] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max1236_mode_list,
+ .num_modes = ARRAY_SIZE(max1236_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1236_channels,
+ .num_channels = ARRAY_SIZE(max1236_channels),
+ },
+ [max1237] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max1236_mode_list,
+ .num_modes = ARRAY_SIZE(max1236_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1236_channels,
+ .num_channels = ARRAY_SIZE(max1236_channels),
+ },
+ [max1238] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1238_channels,
+ .num_channels = ARRAY_SIZE(max1238_channels),
+ },
+ [max1239] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1238_channels,
+ .num_channels = ARRAY_SIZE(max1238_channels),
+ },
+ [max11600] = {
+ .bits = 8,
+ .int_vref_mv = 4096,
+ .mode_list = max11607_mode_list,
+ .num_modes = ARRAY_SIZE(max11607_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1036_channels,
+ .num_channels = ARRAY_SIZE(max1036_channels),
+ },
+ [max11601] = {
+ .bits = 8,
+ .int_vref_mv = 2048,
+ .mode_list = max11607_mode_list,
+ .num_modes = ARRAY_SIZE(max11607_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1036_channels,
+ .num_channels = ARRAY_SIZE(max1036_channels),
+ },
+ [max11602] = {
+ .bits = 8,
+ .int_vref_mv = 4096,
+ .mode_list = max11608_mode_list,
+ .num_modes = ARRAY_SIZE(max11608_mode_list),
+ .default_mode = s0to7,
+ .info = &max1238_info,
+ .channels = max11602_channels,
+ .num_channels = ARRAY_SIZE(max11602_channels),
+ },
+ [max11603] = {
+ .bits = 8,
+ .int_vref_mv = 2048,
+ .mode_list = max11608_mode_list,
+ .num_modes = ARRAY_SIZE(max11608_mode_list),
+ .default_mode = s0to7,
+ .info = &max1238_info,
+ .channels = max11602_channels,
+ .num_channels = ARRAY_SIZE(max11602_channels),
+ },
+ [max11604] = {
+ .bits = 8,
+ .int_vref_mv = 4096,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1038_channels,
+ .num_channels = ARRAY_SIZE(max1038_channels),
+ },
+ [max11605] = {
+ .bits = 8,
+ .int_vref_mv = 2048,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1038_channels,
+ .num_channels = ARRAY_SIZE(max1038_channels),
+ },
+ [max11606] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max11607_mode_list,
+ .num_modes = ARRAY_SIZE(max11607_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1136_channels,
+ .num_channels = ARRAY_SIZE(max1136_channels),
+ },
+ [max11607] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max11607_mode_list,
+ .num_modes = ARRAY_SIZE(max11607_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1136_channels,
+ .num_channels = ARRAY_SIZE(max1136_channels),
+ },
+ [max11608] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max11608_mode_list,
+ .num_modes = ARRAY_SIZE(max11608_mode_list),
+ .default_mode = s0to7,
+ .info = &max1238_info,
+ .channels = max11608_channels,
+ .num_channels = ARRAY_SIZE(max11608_channels),
+ },
+ [max11609] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max11608_mode_list,
+ .num_modes = ARRAY_SIZE(max11608_mode_list),
+ .default_mode = s0to7,
+ .info = &max1238_info,
+ .channels = max11608_channels,
+ .num_channels = ARRAY_SIZE(max11608_channels),
+ },
+ [max11610] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1138_channels,
+ .num_channels = ARRAY_SIZE(max1138_channels),
+ },
+ [max11611] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1138_channels,
+ .num_channels = ARRAY_SIZE(max1138_channels),
+ },
+ [max11612] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max11607_mode_list,
+ .num_modes = ARRAY_SIZE(max11607_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1363_channels,
+ .num_channels = ARRAY_SIZE(max1363_channels),
+ },
+ [max11613] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max11607_mode_list,
+ .num_modes = ARRAY_SIZE(max11607_mode_list),
+ .default_mode = s0to3,
+ .info = &max1238_info,
+ .channels = max1363_channels,
+ .num_channels = ARRAY_SIZE(max1363_channels),
+ },
+ [max11614] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max11608_mode_list,
+ .num_modes = ARRAY_SIZE(max11608_mode_list),
+ .default_mode = s0to7,
+ .info = &max1238_info,
+ .channels = max11614_channels,
+ .num_channels = ARRAY_SIZE(max11614_channels),
+ },
+ [max11615] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max11608_mode_list,
+ .num_modes = ARRAY_SIZE(max11608_mode_list),
+ .default_mode = s0to7,
+ .info = &max1238_info,
+ .channels = max11614_channels,
+ .num_channels = ARRAY_SIZE(max11614_channels),
+ },
+ [max11616] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1238_channels,
+ .num_channels = ARRAY_SIZE(max1238_channels),
+ },
+ [max11617] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max1238_mode_list,
+ .num_modes = ARRAY_SIZE(max1238_mode_list),
+ .default_mode = s0to11,
+ .info = &max1238_info,
+ .channels = max1238_channels,
+ .num_channels = ARRAY_SIZE(max1238_channels),
+ },
+ [max11644] = {
+ .bits = 12,
+ .int_vref_mv = 2048,
+ .mode_list = max11644_mode_list,
+ .num_modes = ARRAY_SIZE(max11644_mode_list),
+ .default_mode = s0to1,
+ .info = &max1238_info,
+ .channels = max11644_channels,
+ .num_channels = ARRAY_SIZE(max11644_channels),
+ },
+ [max11645] = {
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .mode_list = max11644_mode_list,
+ .num_modes = ARRAY_SIZE(max11644_mode_list),
+ .default_mode = s0to1,
+ .info = &max1238_info,
+ .channels = max11644_channels,
+ .num_channels = ARRAY_SIZE(max11644_channels),
+ },
+ [max11646] = {
+ .bits = 10,
+ .int_vref_mv = 2048,
+ .mode_list = max11644_mode_list,
+ .num_modes = ARRAY_SIZE(max11644_mode_list),
+ .default_mode = s0to1,
+ .info = &max1238_info,
+ .channels = max11646_channels,
+ .num_channels = ARRAY_SIZE(max11646_channels),
+ },
+ [max11647] = {
+ .bits = 10,
+ .int_vref_mv = 4096,
+ .mode_list = max11644_mode_list,
+ .num_modes = ARRAY_SIZE(max11644_mode_list),
+ .default_mode = s0to1,
+ .info = &max1238_info,
+ .channels = max11646_channels,
+ .num_channels = ARRAY_SIZE(max11646_channels),
+ },
+};
+
+static int max1363_initial_setup(struct max1363_state *st)
+{
+ st->setupbyte = MAX1363_SETUP_INT_CLOCK
+ | MAX1363_SETUP_UNIPOLAR
+ | MAX1363_SETUP_NORESET;
+
+ if (st->vref)
+ st->setupbyte |= MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF;
+ else
+ st->setupbyte |= MAX1363_SETUP_POWER_UP_INT_REF
+ | MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT;
+
+ /* Set scan mode writes the config anyway so wait until then */
+ st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte);
+ st->current_mode = &max1363_mode_table[st->chip_info->default_mode];
+ st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte);
+
+ return max1363_set_scan_mode(st);
+}
+
+static int max1363_alloc_scan_masks(struct iio_dev *indio_dev)
+{
+ struct max1363_state *st = iio_priv(indio_dev);
+ unsigned long *masks;
+ int i;
+
+ masks = devm_kzalloc(&indio_dev->dev,
+ BITS_TO_LONGS(MAX1363_MAX_CHANNELS) * sizeof(long) *
+ (st->chip_info->num_modes + 1), GFP_KERNEL);
+ if (!masks)
+ return -ENOMEM;
+
+ for (i = 0; i < st->chip_info->num_modes; i++)
+ bitmap_copy(masks + BITS_TO_LONGS(MAX1363_MAX_CHANNELS)*i,
+ max1363_mode_table[st->chip_info->mode_list[i]]
+ .modemask, MAX1363_MAX_CHANNELS);
+
+ indio_dev->available_scan_masks = masks;
+
+ return 0;
+}
+
+static irqreturn_t max1363_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct max1363_state *st = iio_priv(indio_dev);
+ __u8 *rxbuf;
+ int b_sent;
+ size_t d_size;
+ unsigned long numvals = bitmap_weight(st->current_mode->modemask,
+ MAX1363_MAX_CHANNELS);
+
+ /* Ensure the timestamp is 8 byte aligned */
+ if (st->chip_info->bits != 8)
+ d_size = numvals*2;
+ else
+ d_size = numvals;
+ if (indio_dev->scan_timestamp) {
+ d_size += sizeof(s64);
+ if (d_size % sizeof(s64))
+ d_size += sizeof(s64) - (d_size % sizeof(s64));
+ }
+ /* 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)
+ goto done;
+
+ rxbuf = kmalloc(d_size, GFP_KERNEL);
+ if (rxbuf == NULL)
+ goto done;
+ if (st->chip_info->bits != 8)
+ b_sent = st->recv(st->client, rxbuf, numvals * 2);
+ else
+ b_sent = st->recv(st->client, rxbuf, numvals);
+ if (b_sent < 0)
+ goto done_free;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, rxbuf, iio_get_time_ns());
+
+done_free:
+ kfree(rxbuf);
+done:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int max1363_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct max1363_state *st;
+ struct iio_dev *indio_dev;
+ struct regulator *vref;
+
+ indio_dev = devm_iio_device_alloc(&client->dev,
+ sizeof(struct max1363_state));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ indio_dev->dev.of_node = client->dev.of_node;
+ ret = iio_map_array_register(indio_dev, client->dev.platform_data);
+ if (ret < 0)
+ return ret;
+
+ st = iio_priv(indio_dev);
+
+ st->reg = devm_regulator_get(&client->dev, "vcc");
+ if (IS_ERR(st->reg)) {
+ ret = PTR_ERR(st->reg);
+ goto error_unregister_map;
+ }
+
+ ret = regulator_enable(st->reg);
+ if (ret)
+ goto error_unregister_map;
+
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, indio_dev);
+
+ st->chip_info = &max1363_chip_info_tbl[id->driver_data];
+ st->client = client;
+
+ st->vref_uv = st->chip_info->int_vref_mv * 1000;
+ vref = devm_regulator_get_optional(&client->dev, "vref");
+ if (!IS_ERR(vref)) {
+ int vref_uv;
+
+ ret = regulator_enable(vref);
+ if (ret)
+ goto error_disable_reg;
+ st->vref = vref;
+ vref_uv = regulator_get_voltage(vref);
+ if (vref_uv <= 0) {
+ ret = -EINVAL;
+ goto error_disable_reg;
+ }
+ st->vref_uv = vref_uv;
+ }
+
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ st->send = i2c_master_send;
+ st->recv = i2c_master_recv;
+ } else if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)
+ && st->chip_info->bits == 8) {
+ st->send = max1363_smbus_send;
+ st->recv = max1363_smbus_recv;
+ } else {
+ ret = -EOPNOTSUPP;
+ goto error_disable_reg;
+ }
+
+ ret = max1363_alloc_scan_masks(indio_dev);
+ if (ret)
+ goto error_disable_reg;
+
+ /* Establish that the iio_dev is a child of the i2c device */
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = id->name;
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = st->chip_info->num_channels;
+ indio_dev->info = st->chip_info->info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ ret = max1363_initial_setup(st);
+ if (ret < 0)
+ goto error_disable_reg;
+
+ ret = iio_triggered_buffer_setup(indio_dev, NULL,
+ &max1363_trigger_handler, NULL);
+ if (ret)
+ goto error_disable_reg;
+
+ if (client->irq) {
+ ret = devm_request_threaded_irq(&client->dev, st->client->irq,
+ NULL,
+ &max1363_event_handler,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ "max1363_event",
+ indio_dev);
+
+ if (ret)
+ goto error_uninit_buffer;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto error_uninit_buffer;
+
+ return 0;
+
+error_uninit_buffer:
+ iio_triggered_buffer_cleanup(indio_dev);
+error_disable_reg:
+ if (st->vref)
+ regulator_disable(st->vref);
+ regulator_disable(st->reg);
+error_unregister_map:
+ iio_map_array_unregister(indio_dev);
+ return ret;
+}
+
+static int max1363_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct max1363_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+ if (st->vref)
+ regulator_disable(st->vref);
+ regulator_disable(st->reg);
+ iio_map_array_unregister(indio_dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id max1363_id[] = {
+ { "max1361", max1361 },
+ { "max1362", max1362 },
+ { "max1363", max1363 },
+ { "max1364", max1364 },
+ { "max1036", max1036 },
+ { "max1037", max1037 },
+ { "max1038", max1038 },
+ { "max1039", max1039 },
+ { "max1136", max1136 },
+ { "max1137", max1137 },
+ { "max1138", max1138 },
+ { "max1139", max1139 },
+ { "max1236", max1236 },
+ { "max1237", max1237 },
+ { "max1238", max1238 },
+ { "max1239", max1239 },
+ { "max11600", max11600 },
+ { "max11601", max11601 },
+ { "max11602", max11602 },
+ { "max11603", max11603 },
+ { "max11604", max11604 },
+ { "max11605", max11605 },
+ { "max11606", max11606 },
+ { "max11607", max11607 },
+ { "max11608", max11608 },
+ { "max11609", max11609 },
+ { "max11610", max11610 },
+ { "max11611", max11611 },
+ { "max11612", max11612 },
+ { "max11613", max11613 },
+ { "max11614", max11614 },
+ { "max11615", max11615 },
+ { "max11616", max11616 },
+ { "max11617", max11617 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, max1363_id);
+
+static struct i2c_driver max1363_driver = {
+ .driver = {
+ .name = "max1363",
+ },
+ .probe = max1363_probe,
+ .remove = max1363_remove,
+ .id_table = max1363_id,
+};
+module_i2c_driver(max1363_driver);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
+MODULE_DESCRIPTION("Maxim 1363 ADC");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff