^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) * w1_ds2406.c - w1 family 12 (DS2406) driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * based on w1_ds2413.c by Mariusz Bialonczyk <manio@skyboo.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2014 Scott Alfter <scott@alfter.us>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/delay.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/crc16.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define W1_FAMILY_DS2406 0x12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define W1_F12_FUNC_READ_STATUS 0xAA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define W1_F12_FUNC_WRITE_STATUS 0x55
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static ssize_t w1_f12_read_state(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) char *buf, loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) u8 w1_buf[6]={W1_F12_FUNC_READ_STATUS, 7, 0, 0, 0, 0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) u16 crc=0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ssize_t rtnval=1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (w1_reset_select_slave(sl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) w1_write_block(sl->master, w1_buf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) w1_read_block(sl->master, w1_buf+3, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) for (i=0; i<6; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) crc=crc16_byte(crc, w1_buf[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (crc==0xb001) /* good read? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *buf=((w1_buf[3]>>5)&3)|0x30;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) rtnval=-EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return rtnval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static ssize_t w1_f12_write_output(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) char *buf, loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) u8 w1_buf[6]={W1_F12_FUNC_WRITE_STATUS, 7, 0, 0, 0, 0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) u16 crc=0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ssize_t rtnval=1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (w1_reset_select_slave(sl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) w1_buf[3] = (((*buf)&3)<<5)|0x1F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) w1_write_block(sl->master, w1_buf, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) w1_read_block(sl->master, w1_buf+4, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) for (i=0; i<6; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) crc=crc16_byte(crc, w1_buf[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (crc==0xb001) /* good read? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) w1_write_8(sl->master, 0xFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) rtnval=-EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return rtnval;
^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) #define NB_SYSFS_BIN_FILES 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static struct bin_attribute w1_f12_sysfs_bin_files[NB_SYSFS_BIN_FILES] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .name = "state",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) .mode = S_IRUGO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .size = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .read = w1_f12_read_state,
^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) .attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .name = "output",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) .mode = S_IRUGO | S_IWUSR | S_IWGRP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .size = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .write = w1_f12_write_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int w1_f12_add_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) err = sysfs_create_bin_file(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) &sl->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) &(w1_f12_sysfs_bin_files[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) while (--i >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) sysfs_remove_bin_file(&sl->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) &(w1_f12_sysfs_bin_files[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return err;
^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) static void w1_f12_remove_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) for (i = NB_SYSFS_BIN_FILES - 1; i >= 0; --i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) sysfs_remove_bin_file(&sl->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) &(w1_f12_sysfs_bin_files[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static const struct w1_family_ops w1_f12_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .add_slave = w1_f12_add_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .remove_slave = w1_f12_remove_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct w1_family w1_family_12 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .fid = W1_FAMILY_DS2406,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .fops = &w1_f12_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) module_w1_family(w1_family_12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) MODULE_AUTHOR("Scott Alfter <scott@alfter.us>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) MODULE_DESCRIPTION("w1 family 12 driver for DS2406 2 Pin IO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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