Orange Pi5 kernel

^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)  * veml6070.c - Support for Vishay VEML6070 UV A light sensor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright 2016 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * IIO driver for VEML6070 (7-bit I2C slave addresses 0x38 and 0x39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * TODO: integration time, ACK signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/iio/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define VEML6070_DRV_NAME "veml6070"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define VEML6070_ADDR_CONFIG_DATA_MSB 0x38 /* read: MSB data, write: config */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define VEML6070_ADDR_DATA_LSB	0x39 /* LSB data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define VEML6070_COMMAND_ACK	BIT(5) /* raise interrupt when over threshold */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define VEML6070_COMMAND_IT	GENMASK(3, 2) /* bit mask integration time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define VEML6070_COMMAND_RSRVD	BIT(1) /* reserved, set to 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define VEML6070_COMMAND_SD	BIT(0) /* shutdown mode when set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define VEML6070_IT_10	0x04 /* integration time 1x */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) struct veml6070_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct i2c_client *client1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct i2c_client *client2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	u8 config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct mutex lock;
^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) static int veml6070_read(struct veml6070_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	u8 msb, lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	mutex_lock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	/* disable shutdown */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	ret = i2c_smbus_write_byte(data->client1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	    data->config & ~VEML6070_COMMAND_SD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	msleep(125 + 10); /* measurement takes up to 125 ms for IT 1x */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	ret = i2c_smbus_read_byte(data->client2); /* read MSB, address 0x39 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	msb = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	ret = i2c_smbus_read_byte(data->client1); /* read LSB, address 0x38 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	lsb = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	/* shutdown again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	ret = i2c_smbus_write_byte(data->client1, data->config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ret = (msb << 8) | lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static const struct iio_chan_spec veml6070_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		.type = IIO_INTENSITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		.modified = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		.channel2 = IIO_MOD_LIGHT_UV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
^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) 		.type = IIO_UVINDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static int veml6070_to_uv_index(unsigned val)
^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) 	 * conversion of raw UV intensity values to UV index depends on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * integration time (IT) and value of the resistor connected to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 * the RSET pin (default: 270 KOhm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	unsigned uvi[11] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		187, 373, 560, /* low */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		746, 933, 1120, /* moderate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		1308, 1494, /* high */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		1681, 1868, 2054}; /* very high */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	for (i = 0; i < ARRAY_SIZE(uvi); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		if (val <= uvi[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return 11; /* extreme */
^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) static int veml6070_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 				int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	struct veml6070_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	case IIO_CHAN_INFO_PROCESSED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		ret = veml6070_read(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		if (mask == IIO_CHAN_INFO_PROCESSED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			*val = veml6070_to_uv_index(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			*val = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static const struct iio_info veml6070_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	.read_raw = veml6070_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int veml6070_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			  const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct veml6070_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	i2c_set_clientdata(client, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	data->client1 = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	mutex_init(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	indio_dev->info = &veml6070_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	indio_dev->channels = veml6070_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	indio_dev->num_channels = ARRAY_SIZE(veml6070_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	indio_dev->name = VEML6070_DRV_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	data->client2 = i2c_new_dummy_device(client->adapter, VEML6070_ADDR_DATA_LSB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (IS_ERR(data->client2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		dev_err(&client->dev, "i2c device for second chip address failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return PTR_ERR(data->client2);
^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) 	data->config = VEML6070_IT_10 | VEML6070_COMMAND_RSRVD |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		VEML6070_COMMAND_SD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	ret = i2c_smbus_write_byte(data->client1, data->config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	ret = iio_device_register(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	i2c_unregister_device(data->client2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static int veml6070_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	struct veml6070_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	iio_device_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	i2c_unregister_device(data->client2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return 0;
^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) static const struct i2c_device_id veml6070_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	{ "veml6070", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) MODULE_DEVICE_TABLE(i2c, veml6070_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static struct i2c_driver veml6070_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		.name   = VEML6070_DRV_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	.probe  = veml6070_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	.remove  = veml6070_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	.id_table = veml6070_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) module_i2c_driver(veml6070_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) MODULE_DESCRIPTION("Vishay VEML6070 UV A light sensor driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) MODULE_LICENSE("GPL");