^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * iio/dac/max5821.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2014 Philippe Reynes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define MAX5821_MAX_DAC_CHANNELS 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /* command bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define MAX5821_LOAD_DAC_A_IN_REG_B 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define MAX5821_LOAD_DAC_B_IN_REG_A 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define MAX5821_EXTENDED_COMMAND_MODE 0xf0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define MAX5821_READ_DAC_A_COMMAND 0xf1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define MAX5821_READ_DAC_B_COMMAND 0xf2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define MAX5821_EXTENDED_POWER_UP 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define MAX5821_EXTENDED_POWER_DOWN_MODE0 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define MAX5821_EXTENDED_POWER_DOWN_MODE1 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define MAX5821_EXTENDED_POWER_DOWN_MODE2 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define MAX5821_EXTENDED_DAC_A 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define MAX5821_EXTENDED_DAC_B 0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) enum max5821_device_ids {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) ID_MAX5821,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct max5821_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct regulator *vref_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned short vref_mv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) bool powerdown[MAX5821_MAX_DAC_CHANNELS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u8 powerdown_mode[MAX5821_MAX_DAC_CHANNELS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static const char * const max5821_powerdown_modes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) "three_state",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) "1kohm_to_gnd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) "100kohm_to_gnd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) MAX5821_THREE_STATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) MAX5821_1KOHM_TO_GND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) MAX5821_100KOHM_TO_GND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int max5821_get_powerdown_mode(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) const struct iio_chan_spec *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct max5821_data *st = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return st->powerdown_mode[chan->channel];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static int max5821_set_powerdown_mode(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) const struct iio_chan_spec *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct max5821_data *st = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) st->powerdown_mode[chan->channel] = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static const struct iio_enum max5821_powerdown_mode_enum = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .items = max5821_powerdown_modes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .num_items = ARRAY_SIZE(max5821_powerdown_modes),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .get = max5821_get_powerdown_mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .set = max5821_set_powerdown_mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static ssize_t max5821_read_dac_powerdown(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) uintptr_t private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) const struct iio_chan_spec *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct max5821_data *st = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return sprintf(buf, "%d\n", st->powerdown[chan->channel]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static int max5821_sync_powerdown_mode(struct max5821_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) const struct iio_chan_spec *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) u8 outbuf[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) outbuf[0] = MAX5821_EXTENDED_COMMAND_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (chan->channel == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) outbuf[1] = MAX5821_EXTENDED_DAC_A;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) outbuf[1] = MAX5821_EXTENDED_DAC_B;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (data->powerdown[chan->channel])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) outbuf[1] |= data->powerdown_mode[chan->channel] + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) outbuf[1] |= MAX5821_EXTENDED_POWER_UP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return i2c_master_send(data->client, outbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static ssize_t max5821_write_dac_powerdown(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) uintptr_t private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) const struct iio_chan_spec *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) const char *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct max5821_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) bool powerdown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ret = strtobool(buf, &powerdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) data->powerdown[chan->channel] = powerdown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ret = max5821_sync_powerdown_mode(data, chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static const struct iio_chan_spec_ext_info max5821_ext_info[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .name = "powerdown",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .read = max5821_read_dac_powerdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .write = max5821_write_dac_powerdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .shared = IIO_SEPARATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) IIO_ENUM("powerdown_mode", IIO_SEPARATE, &max5821_powerdown_mode_enum),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) IIO_ENUM_AVAILABLE("powerdown_mode", &max5821_powerdown_mode_enum),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #define MAX5821_CHANNEL(chan) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .type = IIO_VOLTAGE, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) .indexed = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .output = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .channel = (chan), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) .ext_info = max5821_ext_info, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static const struct iio_chan_spec max5821_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) MAX5821_CHANNEL(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) MAX5821_CHANNEL(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static const u8 max5821_read_dac_command[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) MAX5821_READ_DAC_A_COMMAND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) MAX5821_READ_DAC_B_COMMAND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static const u8 max5821_load_dac_command[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) MAX5821_LOAD_DAC_A_IN_REG_B,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) MAX5821_LOAD_DAC_B_IN_REG_A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static int max5821_get_value(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) int *val, int channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct max5821_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) u8 outbuf[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) u8 inbuf[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if ((channel != 0) && (channel != 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) outbuf[0] = max5821_read_dac_command[channel];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) mutex_lock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) ret = i2c_master_send(client, outbuf, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) } else if (ret != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) ret = i2c_master_recv(client, inbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) } else if (ret != 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) *val = ((inbuf[0] & 0x0f) << 6) | (inbuf[1] >> 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static int max5821_set_value(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int val, int channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) struct max5821_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) u8 outbuf[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if ((val < 0) || (val > 1023))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if ((channel != 0) && (channel != 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) outbuf[0] = max5821_load_dac_command[channel];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) outbuf[0] |= val >> 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) outbuf[1] = (val & 0x3f) << 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ret = i2c_master_send(client, outbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) else if (ret != 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) static int max5821_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct max5821_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return max5821_get_value(indio_dev, val, chan->channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) *val = data->vref_mv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) *val2 = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return IIO_VAL_FRACTIONAL_LOG2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static int max5821_write_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int val, int val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (val2 != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return max5821_set_value(indio_dev, val, chan->channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static int __maybe_unused max5821_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) u8 outbuf[2] = { MAX5821_EXTENDED_COMMAND_MODE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) MAX5821_EXTENDED_DAC_A |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) MAX5821_EXTENDED_DAC_B |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) MAX5821_EXTENDED_POWER_DOWN_MODE2 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return i2c_master_send(to_i2c_client(dev), outbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static int __maybe_unused max5821_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) u8 outbuf[2] = { MAX5821_EXTENDED_COMMAND_MODE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MAX5821_EXTENDED_DAC_A |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) MAX5821_EXTENDED_DAC_B |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) MAX5821_EXTENDED_POWER_UP };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return i2c_master_send(to_i2c_client(dev), outbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static SIMPLE_DEV_PM_OPS(max5821_pm_ops, max5821_suspend, max5821_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static const struct iio_info max5821_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) .read_raw = max5821_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) .write_raw = max5821_write_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static int max5821_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct max5821_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) u32 tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) i2c_set_clientdata(client, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) mutex_init(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* max5821 start in powerdown mode 100Kohm to ground */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) for (tmp = 0; tmp < MAX5821_MAX_DAC_CHANNELS; tmp++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) data->powerdown[tmp] = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) data->powerdown_mode[tmp] = MAX5821_100KOHM_TO_GND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) data->vref_reg = devm_regulator_get(&client->dev, "vref");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (IS_ERR(data->vref_reg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) ret = PTR_ERR(data->vref_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) "Failed to get vref regulator: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) goto error_free_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) ret = regulator_enable(data->vref_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) "Failed to enable vref regulator: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) goto error_free_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) ret = regulator_get_voltage(data->vref_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) "Failed to get voltage on regulator: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) goto error_disable_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) data->vref_mv = ret / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) indio_dev->name = id->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) indio_dev->num_channels = ARRAY_SIZE(max5821_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) indio_dev->channels = max5821_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) indio_dev->info = &max5821_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) return iio_device_register(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) error_disable_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) regulator_disable(data->vref_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) error_free_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static int max5821_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct iio_dev *indio_dev = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) struct max5821_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) iio_device_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) regulator_disable(data->vref_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static const struct i2c_device_id max5821_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) { "max5821", ID_MAX5821 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) MODULE_DEVICE_TABLE(i2c, max5821_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) static const struct of_device_id max5821_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) { .compatible = "maxim,max5821" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) MODULE_DEVICE_TABLE(of, max5821_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) static struct i2c_driver max5821_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) .name = "max5821",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) .of_match_table = max5821_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) .pm = &max5821_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) .probe = max5821_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) .remove = max5821_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) .id_table = max5821_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) module_i2c_driver(max5821_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) MODULE_AUTHOR("Philippe Reynes <tremyfr@yahoo.fr>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) MODULE_DESCRIPTION("MAX5821 DAC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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