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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2015-2018
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Matt Ranostay <matt.ranostay@konsulko.com>
^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/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mod_devicetable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/iio/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define VZ89X_REG_MEASUREMENT		0x09
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define VZ89X_REG_MEASUREMENT_RD_SIZE	6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define VZ89X_REG_MEASUREMENT_WR_SIZE	3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define VZ89X_VOC_CO2_IDX		0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define VZ89X_VOC_SHORT_IDX		1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define VZ89X_VOC_TVOC_IDX		2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define VZ89X_VOC_RESISTANCE_IDX	3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define VZ89TE_REG_MEASUREMENT		0x0c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define VZ89TE_REG_MEASUREMENT_RD_SIZE	7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define VZ89TE_REG_MEASUREMENT_WR_SIZE	6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define VZ89TE_VOC_TVOC_IDX		0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define VZ89TE_VOC_CO2_IDX		1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define VZ89TE_VOC_RESISTANCE_IDX	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	VZ89X,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	VZ89TE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) struct vz89x_chip_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) struct vz89x_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	const struct vz89x_chip_data *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	int (*xfer)(struct vz89x_data *data, u8 cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	bool is_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	unsigned long last_update;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) struct vz89x_chip_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	bool (*valid)(struct vz89x_data *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	const struct iio_chan_spec *channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	u8 num_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	u8 cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	u8 read_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	u8 write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static const struct iio_chan_spec vz89x_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		.type = IIO_CONCENTRATION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		.channel2 = IIO_MOD_CO2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		.modified = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		.info_mask_separate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		.address = VZ89X_VOC_CO2_IDX,
^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) 		.type = IIO_CONCENTRATION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		.channel2 = IIO_MOD_VOC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		.modified = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		.address = VZ89X_VOC_SHORT_IDX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		.extend_name = "short",
^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) 		.type = IIO_CONCENTRATION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		.channel2 = IIO_MOD_VOC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		.modified = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		.info_mask_separate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		.address = VZ89X_VOC_TVOC_IDX,
^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) 		.type = IIO_RESISTANCE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		.info_mask_separate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		.address = VZ89X_VOC_RESISTANCE_IDX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		.scan_index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		.scan_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			.endianness = IIO_LE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		},
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static const struct iio_chan_spec vz89te_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		.type = IIO_CONCENTRATION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		.channel2 = IIO_MOD_VOC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		.modified = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		.info_mask_separate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		.address = VZ89TE_VOC_TVOC_IDX,
^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) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		.type = IIO_CONCENTRATION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		.channel2 = IIO_MOD_CO2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		.modified = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		.info_mask_separate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		.address = VZ89TE_VOC_CO2_IDX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		.type = IIO_RESISTANCE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		.info_mask_separate =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		.address = VZ89TE_VOC_RESISTANCE_IDX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		.scan_index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		.scan_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			.endianness = IIO_BE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static IIO_CONST_ATTR(in_concentration_co2_scale, "0.00000698689");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static IIO_CONST_ATTR(in_concentration_voc_scale, "0.00000000436681223");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static struct attribute *vz89x_attributes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	&iio_const_attr_in_concentration_co2_scale.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	&iio_const_attr_in_concentration_voc_scale.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static const struct attribute_group vz89x_attrs_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	.attrs = vz89x_attributes,
^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)  * Chipset sometime updates in the middle of a reading causing it to reset the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  * data pointer, and causing invalid reading of previous data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  * We can check for this by reading MSB of the resistance reading that is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  * always zero, and by also confirming the VOC_short isn't zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static bool vz89x_measurement_is_valid(struct vz89x_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (data->buffer[VZ89X_VOC_SHORT_IDX] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return !!(data->buffer[data->chip->read_size - 1] > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* VZ89TE device has a modified CRC-8 two complement check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static bool vz89te_measurement_is_valid(struct vz89x_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	u8 crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	int i, sum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	for (i = 0; i < (data->chip->read_size - 1); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		sum = crc + data->buffer[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		crc = sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		crc += sum / 256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	return !((0xff - crc) == data->buffer[data->chip->read_size - 1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	const struct vz89x_chip_data *chip = data->chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct i2c_msg msg[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	u8 buf[6] = { cmd, 0, 0, 0, 0, 0xf3 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	msg[0].addr = client->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	msg[0].flags = client->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	msg[0].len = chip->write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	msg[0].buf  = (char *) &buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	msg[1].addr = client->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	msg[1].flags = client->flags | I2C_M_RD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	msg[1].len = chip->read_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	msg[1].buf = (char *) &data->buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	ret = i2c_transfer(client->adapter, msg, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return (ret == 2) ? 0 : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct i2c_client *client = data->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	ret = i2c_smbus_write_word_data(client, cmd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	for (i = 0; i < data->chip->read_size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		ret = i2c_smbus_read_byte(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		data->buffer[i] = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static int vz89x_get_measurement(struct vz89x_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	const struct vz89x_chip_data *chip = data->chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	/* sensor can only be polled once a second max per datasheet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (!time_after(jiffies, data->last_update + HZ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return data->is_valid ? 0 : -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	data->is_valid = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	data->last_update = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	ret = data->xfer(data, chip->cmd);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	ret = chip->valid(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	data->is_valid = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static int vz89x_get_resistance_reading(struct vz89x_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 					struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 					int *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	u8 *tmp = (u8 *) &data->buffer[chan->address];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	switch (chan->scan_type.endianness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	case IIO_LE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		*val = le32_to_cpup((__le32 *) tmp) & GENMASK(23, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	case IIO_BE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		*val = be32_to_cpup((__be32 *) tmp) >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static int vz89x_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			  struct iio_chan_spec const *chan, int *val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			  int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct vz89x_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		mutex_lock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		ret = vz89x_get_measurement(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		switch (chan->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		case IIO_CONCENTRATION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			*val = data->buffer[chan->address];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		case IIO_RESISTANCE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			ret = vz89x_get_resistance_reading(data, chan, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 				return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		switch (chan->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		case IIO_RESISTANCE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			*val = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	case IIO_CHAN_INFO_OFFSET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		switch (chan->channel2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		case IIO_MOD_CO2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			*val = 44;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			*val2 = 250000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			return IIO_VAL_INT_PLUS_MICRO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		case IIO_MOD_VOC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			*val = -13;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		}
^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) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static const struct iio_info vz89x_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	.attrs		= &vz89x_attrs_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	.read_raw	= vz89x_read_raw,
^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) static const struct vz89x_chip_data vz89x_chips[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		.valid = vz89x_measurement_is_valid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		.cmd = VZ89X_REG_MEASUREMENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		.read_size = VZ89X_REG_MEASUREMENT_RD_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		.write_size = VZ89X_REG_MEASUREMENT_WR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		.channels = vz89x_channels,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		.num_channels = ARRAY_SIZE(vz89x_channels),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		.valid = vz89te_measurement_is_valid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		.cmd = VZ89TE_REG_MEASUREMENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		.read_size = VZ89TE_REG_MEASUREMENT_RD_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		.write_size = VZ89TE_REG_MEASUREMENT_WR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		.channels = vz89te_channels,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		.num_channels = ARRAY_SIZE(vz89te_channels),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static const struct of_device_id vz89x_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	{ .compatible = "sgx,vz89x", .data = (void *) VZ89X },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	{ .compatible = "sgx,vz89te", .data = (void *) VZ89TE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) MODULE_DEVICE_TABLE(of, vz89x_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static int vz89x_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		       const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	struct vz89x_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	int chip_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	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) 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		data->xfer = vz89x_i2c_xfer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	else if (i2c_check_functionality(client->adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 				I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BYTE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		data->xfer = vz89x_smbus_xfer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	if (!dev_fwnode(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		chip_id = id->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		chip_id = (unsigned long)device_get_match_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	i2c_set_clientdata(client, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	data->chip = &vz89x_chips[chip_id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	data->last_update = jiffies - HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	mutex_init(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	indio_dev->info = &vz89x_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	indio_dev->name = dev_name(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	indio_dev->channels = data->chip->channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	indio_dev->num_channels = data->chip->num_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	return devm_iio_device_register(dev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static const struct i2c_device_id vz89x_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	{ "vz89x", VZ89X },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	{ "vz89te", VZ89TE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) MODULE_DEVICE_TABLE(i2c, vz89x_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) static struct i2c_driver vz89x_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		.name	= "vz89x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		.of_match_table = vz89x_dt_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	.probe = vz89x_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	.id_table = vz89x_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) module_i2c_driver(vz89x_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) MODULE_LICENSE("GPL v2");