Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Honeywell HIH-6130/HIH-6131 humidity and temperature sensor driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2012 Iain Paton <ipaton0@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * heavily based on the sht21 driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 2010 Urs Fleisch <urs.fleisch@sensirion.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Data sheets available (2012-06-22) at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * http://sensing.honeywell.com/index.php?ci_id=3106&la_id=1&defId=44872
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^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/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/jiffies.h>
^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 hih6130 - HIH-6130 device specific data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * @client: pointer to I2C client device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * @lock: mutex to protect measurement values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * @valid: only false before first measurement is taken
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * @last_update: time of last update (jiffies)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * @temperature: cached temperature measurement value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * @humidity: cached humidity measurement value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * @write_length: length for I2C measurement request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) struct hih6130 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	bool valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	unsigned long last_update;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	int temperature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	int humidity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	size_t write_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * hih6130_temp_ticks_to_millicelsius() - convert raw temperature ticks to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * milli celsius
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * @ticks: temperature ticks value received from sensor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static inline int hih6130_temp_ticks_to_millicelsius(int ticks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	ticks = ticks >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	 * from data sheet section 5.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	 * Formula T = ( ticks / ( 2^14 - 2 ) ) * 165 -40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	return (DIV_ROUND_CLOSEST(ticks * 1650, 16382) - 400) * 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * hih6130_rh_ticks_to_per_cent_mille() - convert raw humidity ticks to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * one-thousandths of a percent relative humidity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * @ticks: humidity ticks value received from sensor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static inline int hih6130_rh_ticks_to_per_cent_mille(int ticks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ticks &= ~0xC000; /* clear status bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	 * from data sheet section 4.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	 * Formula RH = ( ticks / ( 2^14 -2 ) ) * 100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	return DIV_ROUND_CLOSEST(ticks * 1000, 16382) * 100;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * hih6130_update_measurements() - get updated measurements from device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * @dev: device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * Returns 0 on success, else negative errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static int hih6130_update_measurements(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	struct hih6130 *hih6130 = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct i2c_client *client = hih6130->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	int t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	unsigned char tmp[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct i2c_msg msgs[1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			.addr = client->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			.flags = I2C_M_RD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			.len = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			.buf = tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		}
^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) 	mutex_lock(&hih6130->lock);
^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) 	 * While the measurement can be completed in ~40ms the sensor takes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	 * much longer to react to a change in external conditions. How quickly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	 * it reacts depends on airflow and other factors outwith our control.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	 * The datasheet specifies maximum 'Response time' for humidity at 8s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	 * and temperature at 30s under specified conditions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	 * We therefore choose to only read the sensor at most once per second.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	 * This trades off pointless activity polling the sensor much faster
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 * than it can react against better response times in conditions more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 * favourable than specified in the datasheet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (time_after(jiffies, hih6130->last_update + HZ) || !hih6130->valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		 * Write to slave address to request a measurement.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		 * According with the datasheet it should be with no data, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		 * for systems with I2C bus drivers that do not allow zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		 * length packets we write one dummy byte to allow sensor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		 * measurements on them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		tmp[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		ret = i2c_master_send(client, tmp, hih6130->write_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		/* measurement cycle time is ~36.65msec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		msleep(40);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		ret = i2c_transfer(client->adapter, msgs, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if ((tmp[0] & 0xC0) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			dev_err(&client->dev, "Error while reading measurement result\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		t = (tmp[0] << 8) + tmp[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		hih6130->humidity = hih6130_rh_ticks_to_per_cent_mille(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		t = (tmp[2] << 8) + tmp[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		hih6130->temperature = hih6130_temp_ticks_to_millicelsius(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		hih6130->last_update = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		hih6130->valid = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	mutex_unlock(&hih6130->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return ret >= 0 ? 0 : ret;
^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)  * hih6130_show_temperature() - show temperature measurement value in sysfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  * @dev: device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  * @attr: device attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  * @buf: sysfs buffer (PAGE_SIZE) where measurement values are written to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)  * Will be called on read access to temp1_input sysfs attribute.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  * Returns number of bytes written into buffer, negative errno on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static ssize_t hih6130_temperature_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 					struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 					char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct hih6130 *hih6130 = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	ret = hih6130_update_measurements(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return sprintf(buf, "%d\n", hih6130->temperature);
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  * hih6130_show_humidity() - show humidity measurement value in sysfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)  * @dev: device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)  * @attr: device attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * @buf: sysfs buffer (PAGE_SIZE) where measurement values are written to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * Will be called on read access to humidity1_input sysfs attribute.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * Returns number of bytes written into buffer, negative errno on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static ssize_t hih6130_humidity_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 				     struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	struct hih6130 *hih6130 = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	ret = hih6130_update_measurements(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	return sprintf(buf, "%d\n", hih6130->humidity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* sysfs attributes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static SENSOR_DEVICE_ATTR_RO(temp1_input, hih6130_temperature, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static SENSOR_DEVICE_ATTR_RO(humidity1_input, hih6130_humidity, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static struct attribute *hih6130_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	&sensor_dev_attr_temp1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	&sensor_dev_attr_humidity1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ATTRIBUTE_GROUPS(hih6130);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) static int hih6130_probe(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	struct hih6130 *hih6130;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		dev_err(&client->dev, "adapter does not support true I2C\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	hih6130 = devm_kzalloc(dev, sizeof(*hih6130), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (!hih6130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	hih6130->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	mutex_init(&hih6130->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_QUICK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		hih6130->write_length = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 							   hih6130,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 							   hih6130_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	return PTR_ERR_OR_ZERO(hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* Device ID table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static const struct i2c_device_id hih6130_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	{ "hih6130", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) MODULE_DEVICE_TABLE(i2c, hih6130_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static const struct of_device_id __maybe_unused hih6130_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	{ .compatible = "honeywell,hih6130", },
^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) MODULE_DEVICE_TABLE(of, hih6130_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static struct i2c_driver hih6130_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		.name = "hih6130",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		.of_match_table = of_match_ptr(hih6130_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.probe_new   = hih6130_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	.id_table    = hih6130_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) module_i2c_driver(hih6130_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) MODULE_AUTHOR("Iain Paton <ipaton0@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) MODULE_DESCRIPTION("Honeywell HIH-6130 humidity and temperature sensor driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) MODULE_LICENSE("GPL");