diff options
Diffstat (limited to 'drivers/iio/adc/max1363.c')
| -rw-r--r-- | drivers/iio/adc/max1363.c | 1762 |
1 files changed, 1762 insertions, 0 deletions
diff --git a/drivers/iio/adc/max1363.c b/drivers/iio/adc/max1363.c new file mode 100644 index 000000000..a8d35aebe --- /dev/null +++ b/drivers/iio/adc/max1363.c @@ -0,0 +1,1762 @@ + /* + * 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/of.h> +#include <linux/of_device.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(indio_dev); + 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 const struct attribute_group max1363_event_attribute_group = { + .attrs = max1363_event_attributes, +}; + +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, + .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, + .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 = 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), + }, + [max11645] = { + .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), + }, + [max11646] = { + .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), + }, + [max11647] = { + .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), + }, +}; + +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, + array3_size(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(indio_dev)); + +done_free: + kfree(rxbuf); +done: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_OF + +#define MAX1363_COMPATIBLE(of_compatible, cfg) { \ + .compatible = of_compatible, \ + .data = &max1363_chip_info_tbl[cfg], \ +} + +static const struct of_device_id max1363_of_match[] = { + MAX1363_COMPATIBLE("maxim,max1361", max1361), + MAX1363_COMPATIBLE("maxim,max1362", max1362), + MAX1363_COMPATIBLE("maxim,max1363", max1363), + MAX1363_COMPATIBLE("maxim,max1364", max1364), + MAX1363_COMPATIBLE("maxim,max1036", max1036), + MAX1363_COMPATIBLE("maxim,max1037", max1037), + MAX1363_COMPATIBLE("maxim,max1038", max1038), + MAX1363_COMPATIBLE("maxim,max1039", max1039), + MAX1363_COMPATIBLE("maxim,max1136", max1136), + MAX1363_COMPATIBLE("maxim,max1137", max1137), + MAX1363_COMPATIBLE("maxim,max1138", max1138), + MAX1363_COMPATIBLE("maxim,max1139", max1139), + MAX1363_COMPATIBLE("maxim,max1236", max1236), + MAX1363_COMPATIBLE("maxim,max1237", max1237), + MAX1363_COMPATIBLE("maxim,max1238", max1238), + MAX1363_COMPATIBLE("maxim,max1239", max1239), + MAX1363_COMPATIBLE("maxim,max11600", max11600), + MAX1363_COMPATIBLE("maxim,max11601", max11601), + MAX1363_COMPATIBLE("maxim,max11602", max11602), + MAX1363_COMPATIBLE("maxim,max11603", max11603), + MAX1363_COMPATIBLE("maxim,max11604", max11604), + MAX1363_COMPATIBLE("maxim,max11605", max11605), + MAX1363_COMPATIBLE("maxim,max11606", max11606), + MAX1363_COMPATIBLE("maxim,max11607", max11607), + MAX1363_COMPATIBLE("maxim,max11608", max11608), + MAX1363_COMPATIBLE("maxim,max11609", max11609), + MAX1363_COMPATIBLE("maxim,max11610", max11610), + MAX1363_COMPATIBLE("maxim,max11611", max11611), + MAX1363_COMPATIBLE("maxim,max11612", max11612), + MAX1363_COMPATIBLE("maxim,max11613", max11613), + MAX1363_COMPATIBLE("maxim,max11614", max11614), + MAX1363_COMPATIBLE("maxim,max11615", max11615), + MAX1363_COMPATIBLE("maxim,max11616", max11616), + MAX1363_COMPATIBLE("maxim,max11617", max11617), + MAX1363_COMPATIBLE("maxim,max11644", max11644), + MAX1363_COMPATIBLE("maxim,max11645", max11645), + MAX1363_COMPATIBLE("maxim,max11646", max11646), + MAX1363_COMPATIBLE("maxim,max11647", max11647), + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, max1363_of_match); +#endif + +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 = of_device_get_match_data(&client->dev); + if (!st->chip_info) + 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->dev.of_node = client->dev.of_node; + 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 }, + { "max11644", max11644 }, + { "max11645", max11645 }, + { "max11646", max11646 }, + { "max11647", max11647 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, max1363_id); + +static struct i2c_driver max1363_driver = { + .driver = { + .name = "max1363", + .of_match_table = of_match_ptr(max1363_of_match), + }, + .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"); |