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)  * Sensirion SCD30 carbon dioxide sensor serial driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2020 Tomasz Duszynski <tomasz.duszynski@octakon.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/crc16.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/errno.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/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mod_devicetable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/serdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include "scd30.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define SCD30_SERDEV_ADDR 0x61
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define SCD30_SERDEV_WRITE 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define SCD30_SERDEV_READ 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define SCD30_SERDEV_MAX_BUF_SIZE 17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define SCD30_SERDEV_RX_HEADER_SIZE 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define SCD30_SERDEV_CRC_SIZE 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define SCD30_SERDEV_TIMEOUT msecs_to_jiffies(200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) struct scd30_serdev_priv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct completion meas_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	int num_expected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	int num;
^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) static u16 scd30_serdev_cmd_lookup_tbl[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	[CMD_START_MEAS] = 0x0036,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	[CMD_STOP_MEAS] = 0x0037,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	[CMD_MEAS_INTERVAL] = 0x0025,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	[CMD_MEAS_READY] = 0x0027,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	[CMD_READ_MEAS] = 0x0028,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	[CMD_ASC] = 0x003a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	[CMD_FRC] = 0x0039,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	[CMD_TEMP_OFFSET] = 0x003b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	[CMD_FW_VERSION] = 0x0020,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	[CMD_RESET] = 0x0034,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static u16 scd30_serdev_calc_crc(const char *buf, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	return crc16(0xffff, buf, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static int scd30_serdev_xfer(struct scd30_state *state, char *txbuf, int txsize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			     char *rxbuf, int rxsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct serdev_device *serdev = to_serdev_device(state->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	struct scd30_serdev_priv *priv = state->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	priv->buf = rxbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	priv->num_expected = rxsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	priv->num = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	ret = serdev_device_write(serdev, txbuf, txsize, SCD30_SERDEV_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (ret != txsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	ret = wait_for_completion_interruptible_timeout(&priv->meas_ready, SCD30_SERDEV_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		return -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	return 0;
^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 scd30_serdev_command(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 				void *response, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	 * Communication over serial line is based on modbus protocol (or rather
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	 * its variation called modbus over serial to be precise). Upon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	 * receiving a request device should reply with response.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 * Frame below represents a request message. Each field takes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	 * exactly one byte.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * +------+------+-----+-----+-------+-------+-----+-----+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * | dev  | op   | reg | reg | byte1 | byte0 | crc | crc |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * | addr | code | msb | lsb |       |       | lsb | msb |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 * +------+------+-----+-----+-------+-------+-----+-----+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	 * The message device replies with depends on the 'op code' field from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 * the request. In case it was set to SCD30_SERDEV_WRITE sensor should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	 * reply with unchanged request. Otherwise 'op code' was set to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	 * SCD30_SERDEV_READ and response looks like the one below. As with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	 * request, each field takes one byte.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	 * +------+------+--------+-------+-----+-------+-----+-----+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	 * | dev  | op   | num of | byte0 | ... | byteN | crc | crc |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	 * | addr | code | bytes  |       |     |       | lsb | msb |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	 * +------+------+--------+-------+-----+-------+-----+-----+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	char txbuf[SCD30_SERDEV_MAX_BUF_SIZE] = { SCD30_SERDEV_ADDR },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	     rxbuf[SCD30_SERDEV_MAX_BUF_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	int ret, rxsize, txsize = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	char *rsp = response;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	u16 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	put_unaligned_be16(scd30_serdev_cmd_lookup_tbl[cmd], txbuf + txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	txsize += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (rsp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		txbuf[1] = SCD30_SERDEV_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		if (cmd == CMD_READ_MEAS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			/* number of u16 words to read */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			put_unaligned_be16(size / 2, txbuf + txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			put_unaligned_be16(0x0001, txbuf + txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		txsize += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		crc = scd30_serdev_calc_crc(txbuf, txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		put_unaligned_le16(crc, txbuf + txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		txsize += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		rxsize = SCD30_SERDEV_RX_HEADER_SIZE + size + SCD30_SERDEV_CRC_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if ((cmd == CMD_STOP_MEAS) || (cmd == CMD_RESET))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			arg = 0x0001;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		txbuf[1] = SCD30_SERDEV_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		put_unaligned_be16(arg, txbuf + txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		txsize += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		crc = scd30_serdev_calc_crc(txbuf, txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		put_unaligned_le16(crc, txbuf + txsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		txsize += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		rxsize = txsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	ret = scd30_serdev_xfer(state, txbuf, txsize, rxbuf, rxsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	switch (txbuf[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	case SCD30_SERDEV_WRITE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		if (memcmp(txbuf, rxbuf, txsize)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			dev_err(state->dev, "wrong message received\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	case SCD30_SERDEV_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		if (rxbuf[2] != (rxsize - SCD30_SERDEV_RX_HEADER_SIZE - SCD30_SERDEV_CRC_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			dev_err(state->dev, "received data size does not match header\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			return -EIO;
^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) 		rxsize -= SCD30_SERDEV_CRC_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		crc = get_unaligned_le16(rxbuf + rxsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (crc != scd30_serdev_calc_crc(rxbuf, rxsize)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			dev_err(state->dev, "data integrity check failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			return -EIO;
^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) 		rxsize -= SCD30_SERDEV_RX_HEADER_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		memcpy(rsp, rxbuf + SCD30_SERDEV_RX_HEADER_SIZE, rxsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		dev_err(state->dev, "received unknown op code\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static int scd30_serdev_receive_buf(struct serdev_device *serdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 				    const unsigned char *buf, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	struct iio_dev *indio_dev = dev_get_drvdata(&serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	struct scd30_serdev_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct scd30_state *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	int num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	state = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	priv = state->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	/* just in case sensor puts some unexpected bytes on the bus */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (!priv->buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (priv->num + size >= priv->num_expected)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		num = priv->num_expected - priv->num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		num = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	memcpy(priv->buf + priv->num, buf, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	priv->num += num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (priv->num == priv->num_expected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		priv->buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		complete(&priv->meas_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	return num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static const struct serdev_device_ops scd30_serdev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	.receive_buf = scd30_serdev_receive_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	.write_wakeup = serdev_device_write_wakeup,
^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 scd30_serdev_probe(struct serdev_device *serdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	struct device *dev = &serdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct scd30_serdev_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	int irq, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	init_completion(&priv->meas_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	serdev_device_set_client_ops(serdev, &scd30_serdev_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	ret = devm_serdev_device_open(dev, serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	serdev_device_set_baudrate(serdev, 19200);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	serdev_device_set_flow_control(serdev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	irq = fwnode_irq_get(dev_fwnode(dev), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	return scd30_probe(dev, irq, KBUILD_MODNAME, priv, scd30_serdev_command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static const struct of_device_id scd30_serdev_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	{ .compatible = "sensirion,scd30" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) MODULE_DEVICE_TABLE(of, scd30_serdev_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static struct serdev_device_driver scd30_serdev_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		.name = KBUILD_MODNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		.of_match_table = scd30_serdev_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		.pm = &scd30_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	.probe = scd30_serdev_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) module_serdev_device_driver(scd30_serdev_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) MODULE_AUTHOR("Tomasz Duszynski <tomasz.duszynski@octakon.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor serial driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) MODULE_LICENSE("GPL v2");