Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* ti-dac7311.c - Texas Instruments 8/10/12-bit 1-channel DAC driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2018 CMC NV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * https://www.ti.com/lit/ds/symlink/dac7311.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/module.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) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	ID_DAC5311 = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	ID_DAC6311,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	ID_DAC7311,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	POWER_1KOHM_TO_GND = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	POWER_100KOHM_TO_GND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	POWER_TRI_STATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) struct ti_dac_spec {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	u8 resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static const struct ti_dac_spec ti_dac_spec[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	[ID_DAC5311] = { .resolution = 8 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	[ID_DAC6311] = { .resolution = 10 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	[ID_DAC7311] = { .resolution = 12 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * struct ti_dac_chip - TI DAC chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * @lock: protects write sequences
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * @vref: regulator generating Vref
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * @spi: SPI device to send data to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * @val: cached value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * @powerdown: whether the chip is powered down
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * @powerdown_mode: selected by the user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * @resolution: resolution of the chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * @buf: buffer for transfer data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) struct ti_dac_chip {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct regulator *vref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct spi_device *spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	u16 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	bool powerdown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	u8 powerdown_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	u8 resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	u8 buf[2] ____cacheline_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static u8 ti_dac_get_power(struct ti_dac_chip *ti_dac, bool powerdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (powerdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return ti_dac->powerdown_mode + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static int ti_dac_cmd(struct ti_dac_chip *ti_dac, u8 power, u16 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	u8 shift = 14 - ti_dac->resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ti_dac->buf[0] = (val << shift) & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	ti_dac->buf[1] = (power << 6) | (val >> (8 - shift));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	return spi_write(ti_dac->spi, ti_dac->buf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static const char * const ti_dac_powerdown_modes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	"1kohm_to_gnd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	"100kohm_to_gnd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	"three_state",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static int ti_dac_get_powerdown_mode(struct iio_dev *indio_dev,
^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) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	return ti_dac->powerdown_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static int ti_dac_set_powerdown_mode(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 				     const struct iio_chan_spec *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				     unsigned int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	ti_dac->powerdown_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) static const struct iio_enum ti_dac_powerdown_mode = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	.items = ti_dac_powerdown_modes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	.num_items = ARRAY_SIZE(ti_dac_powerdown_modes),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	.get = ti_dac_get_powerdown_mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	.set = ti_dac_set_powerdown_mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static ssize_t ti_dac_read_powerdown(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 				     uintptr_t private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 				     const struct iio_chan_spec *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 				     char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return sprintf(buf, "%d\n", ti_dac->powerdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static ssize_t ti_dac_write_powerdown(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 				      uintptr_t private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 				      const struct iio_chan_spec *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 				      const char *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	bool powerdown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	u8 power;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	ret = strtobool(buf, &powerdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	power = ti_dac_get_power(ti_dac, powerdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	mutex_lock(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	ret = ti_dac_cmd(ti_dac, power, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		ti_dac->powerdown = powerdown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	mutex_unlock(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	return ret ? ret : len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static const struct iio_chan_spec_ext_info ti_dac_ext_info[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		.name	   = "powerdown",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		.read	   = ti_dac_read_powerdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		.write	   = ti_dac_write_powerdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		.shared	   = IIO_SHARED_BY_TYPE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &ti_dac_powerdown_mode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	IIO_ENUM_AVAILABLE("powerdown_mode", &ti_dac_powerdown_mode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #define TI_DAC_CHANNEL(chan) {					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	.type = IIO_VOLTAGE,					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	.channel = (chan),					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	.output = true,						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	.ext_info = ti_dac_ext_info,				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static const struct iio_chan_spec ti_dac_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	TI_DAC_CHANNEL(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static int ti_dac_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			   struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			   int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		*val = ti_dac->val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		ret = regulator_get_voltage(ti_dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		*val = ret / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		*val2 = ti_dac->resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return IIO_VAL_FRACTIONAL_LOG2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static int ti_dac_write_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			    struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			    int val, int val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	u8 power = ti_dac_get_power(ti_dac, ti_dac->powerdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (ti_dac->val == val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		if (val >= (1 << ti_dac->resolution) || val < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		if (ti_dac->powerdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		mutex_lock(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		ret = ti_dac_cmd(ti_dac, power, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 			ti_dac->val = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		mutex_unlock(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static int ti_dac_write_raw_get_fmt(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 				    struct iio_chan_spec const *chan, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static const struct iio_info ti_dac_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	.read_raw	   = ti_dac_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	.write_raw	   = ti_dac_write_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	.write_raw_get_fmt = ti_dac_write_raw_get_fmt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static int ti_dac_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	struct device *dev = &spi->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	const struct ti_dac_spec *spec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct ti_dac_chip *ti_dac;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	indio_dev = devm_iio_device_alloc(dev, sizeof(*ti_dac));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (!indio_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		dev_err(dev, "can not allocate iio device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	spi->mode = SPI_MODE_1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	spi->bits_per_word = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	spi_setup(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	indio_dev->info = &ti_dac_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	indio_dev->name = spi_get_device_id(spi)->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	indio_dev->channels = ti_dac_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	spi_set_drvdata(spi, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	ti_dac->powerdown = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	ti_dac->spi = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	spec = &ti_dac_spec[spi_get_device_id(spi)->driver_data];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	indio_dev->num_channels = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	ti_dac->resolution = spec->resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	ti_dac->vref = devm_regulator_get(dev, "vref");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (IS_ERR(ti_dac->vref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		dev_err(dev, "error to get regulator\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		return PTR_ERR(ti_dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	ret = regulator_enable(ti_dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		dev_err(dev, "can not enable regulator\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return ret;
^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) 	mutex_init(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	ret = iio_device_register(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		dev_err(dev, "fail to register iio device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	mutex_destroy(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	regulator_disable(ti_dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) static int ti_dac_remove(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	iio_device_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	mutex_destroy(&ti_dac->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	regulator_disable(ti_dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static const struct of_device_id ti_dac_of_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	{ .compatible = "ti,dac5311" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	{ .compatible = "ti,dac6311" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	{ .compatible = "ti,dac7311" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) MODULE_DEVICE_TABLE(of, ti_dac_of_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static const struct spi_device_id ti_dac_spi_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	{ "dac5311", ID_DAC5311  },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	{ "dac6311", ID_DAC6311 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	{ "dac7311", ID_DAC7311 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) MODULE_DEVICE_TABLE(spi, ti_dac_spi_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static struct spi_driver ti_dac_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		.name		= "ti-dac7311",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		.of_match_table	= ti_dac_of_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	.probe	  = ti_dac_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	.remove   = ti_dac_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	.id_table = ti_dac_spi_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) module_spi_driver(ti_dac_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@essensium.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1-channel DAC driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) MODULE_LICENSE("GPL v2");