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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the [therms] of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 2 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190524100844.941364072@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* w1_ds2423.c
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*
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* Copyright (c) 2010 Mika Laitio <lamikr@pilppa.org>
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*
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* This driver will read and write the value of 4 counters to w1_slave file in
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* sys filesystem.
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* Inspired by the w1_therm and w1_ds2431 drivers.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/crc16.h>
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#include <linux/w1.h>
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#define W1_COUNTER_DS2423 0x1D
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#define CRC16_VALID 0xb001
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#define CRC16_INIT 0
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#define COUNTER_COUNT 4
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#define READ_BYTE_COUNT 42
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static ssize_t w1_slave_show(struct device *device,
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struct device_attribute *attr, char *out_buf)
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{
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struct w1_slave *sl = dev_to_w1_slave(device);
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struct w1_master *dev = sl->master;
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u8 rbuf[COUNTER_COUNT * READ_BYTE_COUNT];
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u8 wrbuf[3];
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int rom_addr;
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int read_byte_count;
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int result;
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ssize_t c;
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int ii;
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int p;
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int crc;
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c = PAGE_SIZE;
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rom_addr = (12 << 5) + 31;
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wrbuf[0] = 0xA5;
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wrbuf[1] = rom_addr & 0xFF;
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wrbuf[2] = rom_addr >> 8;
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mutex_lock(&dev->bus_mutex);
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if (!w1_reset_select_slave(sl)) {
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w1_write_block(dev, wrbuf, 3);
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read_byte_count = 0;
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for (p = 0; p < 4; p++) {
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/*
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* 1 byte for first bytes in ram page read
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* 4 bytes for counter
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* 4 bytes for zero bits
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* 2 bytes for crc
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* 31 remaining bytes from the ram page
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*/
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read_byte_count += w1_read_block(dev,
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rbuf + (p * READ_BYTE_COUNT), READ_BYTE_COUNT);
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for (ii = 0; ii < READ_BYTE_COUNT; ++ii)
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c -= snprintf(out_buf + PAGE_SIZE - c,
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c, "%02x ",
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rbuf[(p * READ_BYTE_COUNT) + ii]);
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if (read_byte_count != (p + 1) * READ_BYTE_COUNT) {
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dev_warn(device,
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"w1_counter_read() returned %u bytes "
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"instead of %d bytes wanted.\n",
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read_byte_count,
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READ_BYTE_COUNT);
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c -= snprintf(out_buf + PAGE_SIZE - c,
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c, "crc=NO\n");
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} else {
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if (p == 0) {
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crc = crc16(CRC16_INIT, wrbuf, 3);
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crc = crc16(crc, rbuf, 11);
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} else {
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/*
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* DS2423 calculates crc from all bytes
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* read after the previous crc bytes.
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*/
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crc = crc16(CRC16_INIT,
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(rbuf + 11) +
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((p - 1) * READ_BYTE_COUNT),
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READ_BYTE_COUNT);
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}
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if (crc == CRC16_VALID) {
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result = 0;
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for (ii = 4; ii > 0; ii--) {
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result <<= 8;
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result |= rbuf[(p *
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READ_BYTE_COUNT) + ii];
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}
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c -= snprintf(out_buf + PAGE_SIZE - c,
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c, "crc=YES c=%d\n", result);
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} else {
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c -= snprintf(out_buf + PAGE_SIZE - c,
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c, "crc=NO\n");
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}
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}
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}
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} else {
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c -= snprintf(out_buf + PAGE_SIZE - c, c, "Connection error");
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}
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mutex_unlock(&dev->bus_mutex);
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return PAGE_SIZE - c;
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}
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static DEVICE_ATTR_RO(w1_slave);
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static struct attribute *w1_f1d_attrs[] = {
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&dev_attr_w1_slave.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(w1_f1d);
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static struct w1_family_ops w1_f1d_fops = {
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.groups = w1_f1d_groups,
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};
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static struct w1_family w1_family_1d = {
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.fid = W1_COUNTER_DS2423,
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.fops = &w1_f1d_fops,
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};
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module_w1_family(w1_family_1d);
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MODULE_AUTHOR("Mika Laitio <lamikr@pilppa.org>");
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MODULE_DESCRIPTION("w1 family 1d driver for DS2423, 4 counters and 4kb ram");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("w1-family-" __stringify(W1_COUNTER_DS2423));
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