^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * w1_ds2423.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2010 Mika Laitio <lamikr@pilppa.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * This driver will read and write the value of 4 counters to w1_slave file in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * sys filesystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Inspired by the w1_therm and w1_ds2431 drivers.
^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/kernel.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/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/crc16.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define W1_COUNTER_DS2423 0x1D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define CRC16_VALID 0xb001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define CRC16_INIT 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define COUNTER_COUNT 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define READ_BYTE_COUNT 42
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static ssize_t w1_slave_show(struct device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct device_attribute *attr, char *out_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct w1_slave *sl = dev_to_w1_slave(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct w1_master *dev = sl->master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u8 rbuf[COUNTER_COUNT * READ_BYTE_COUNT];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u8 wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int rom_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int read_byte_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) ssize_t c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int ii;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) int crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) c = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) rom_addr = (12 << 5) + 31;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) wrbuf[0] = 0xA5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) wrbuf[1] = rom_addr & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) wrbuf[2] = rom_addr >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) mutex_lock(&dev->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (!w1_reset_select_slave(sl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) w1_write_block(dev, wrbuf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) read_byte_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) for (p = 0; p < 4; p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * 1 byte for first bytes in ram page read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * 4 bytes for counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * 4 bytes for zero bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * 2 bytes for crc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * 31 remaining bytes from the ram page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) read_byte_count += w1_read_block(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) rbuf + (p * READ_BYTE_COUNT), READ_BYTE_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) for (ii = 0; ii < READ_BYTE_COUNT; ++ii)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) c -= snprintf(out_buf + PAGE_SIZE - c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) c, "%02x ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) rbuf[(p * READ_BYTE_COUNT) + ii]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (read_byte_count != (p + 1) * READ_BYTE_COUNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) dev_warn(device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) "w1_counter_read() returned %u bytes "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) "instead of %d bytes wanted.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) read_byte_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) READ_BYTE_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) c -= snprintf(out_buf + PAGE_SIZE - c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) c, "crc=NO\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (p == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) crc = crc16(CRC16_INIT, wrbuf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) crc = crc16(crc, rbuf, 11);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * DS2423 calculates crc from all bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * read after the previous crc bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) crc = crc16(CRC16_INIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) (rbuf + 11) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ((p - 1) * READ_BYTE_COUNT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) READ_BYTE_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (crc == CRC16_VALID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) result = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) for (ii = 4; ii > 0; ii--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) result <<= 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) result |= rbuf[(p *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) READ_BYTE_COUNT) + ii];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) c -= snprintf(out_buf + PAGE_SIZE - c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) c, "crc=YES c=%d\n", result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) c -= snprintf(out_buf + PAGE_SIZE - c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) c, "crc=NO\n");
^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) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) c -= snprintf(out_buf + PAGE_SIZE - c, c, "Connection error");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) mutex_unlock(&dev->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return PAGE_SIZE - c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static DEVICE_ATTR_RO(w1_slave);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static struct attribute *w1_f1d_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) &dev_attr_w1_slave.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ATTRIBUTE_GROUPS(w1_f1d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static const struct w1_family_ops w1_f1d_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) .groups = w1_f1d_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static struct w1_family w1_family_1d = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) .fid = W1_COUNTER_DS2423,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) .fops = &w1_f1d_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) module_w1_family(w1_family_1d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) MODULE_AUTHOR("Mika Laitio <lamikr@pilppa.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) MODULE_DESCRIPTION("w1 family 1d driver for DS2423, 4 counters and 4kb ram");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) MODULE_ALIAS("w1-family-" __stringify(W1_COUNTER_DS2423));
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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