^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_ds2408.c - w1 family 29 (DS2408) driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2010 Jean-Francois Dagenais <dagenaisj@sonatest.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define W1_FAMILY_DS2408 0x29
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define W1_F29_RETRIES 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define W1_F29_REG_LOGIG_STATE 0x88 /* R */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define W1_F29_REG_OUTPUT_LATCH_STATE 0x89 /* R */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define W1_F29_REG_ACTIVITY_LATCH_STATE 0x8A /* R */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define W1_F29_REG_COND_SEARCH_SELECT_MASK 0x8B /* RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define W1_F29_REG_COND_SEARCH_POL_SELECT 0x8C /* RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define W1_F29_REG_CONTROL_AND_STATUS 0x8D /* RW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define W1_F29_FUNC_READ_PIO_REGS 0xF0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define W1_F29_FUNC_CHANN_ACCESS_READ 0xF5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define W1_F29_FUNC_CHANN_ACCESS_WRITE 0x5A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* also used to write the control/status reg (0x8D): */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define W1_F29_FUNC_WRITE_COND_SEARCH_REG 0xCC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define W1_F29_FUNC_RESET_ACTIVITY_LATCHES 0xC3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define W1_F29_SUCCESS_CONFIRM_BYTE 0xAA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static int _read_reg(struct w1_slave *sl, u8 address, unsigned char* buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) u8 wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) dev_dbg(&sl->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) "Reading with slave: %p, reg addr: %0#4x, buff addr: %p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) sl, (unsigned int)address, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) dev_dbg(&sl->dev, "mutex locked");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^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) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) wrbuf[0] = W1_F29_FUNC_READ_PIO_REGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) wrbuf[1] = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) wrbuf[2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) w1_write_block(sl->master, wrbuf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *buf = w1_read_8(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dev_dbg(&sl->dev, "mutex unlocked");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static ssize_t state_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct bin_attribute *bin_attr, char *buf, loff_t off,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) dev_dbg(&kobj_to_w1_slave(kobj)->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) bin_attr->attr.name, kobj, (unsigned int)off, count, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return _read_reg(kobj_to_w1_slave(kobj), W1_F29_REG_LOGIG_STATE, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static ssize_t output_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) dev_dbg(&kobj_to_w1_slave(kobj)->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) bin_attr->attr.name, kobj, (unsigned int)off, count, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return _read_reg(kobj_to_w1_slave(kobj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) W1_F29_REG_OUTPUT_LATCH_STATE, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static ssize_t activity_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) dev_dbg(&kobj_to_w1_slave(kobj)->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) bin_attr->attr.name, kobj, (unsigned int)off, count, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return _read_reg(kobj_to_w1_slave(kobj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) W1_F29_REG_ACTIVITY_LATCH_STATE, buf);
^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) static ssize_t cond_search_mask_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) dev_dbg(&kobj_to_w1_slave(kobj)->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) bin_attr->attr.name, kobj, (unsigned int)off, count, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return _read_reg(kobj_to_w1_slave(kobj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) W1_F29_REG_COND_SEARCH_SELECT_MASK, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static ssize_t cond_search_polarity_read(struct file *filp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) char *buf, loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return _read_reg(kobj_to_w1_slave(kobj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) W1_F29_REG_COND_SEARCH_POL_SELECT, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static ssize_t status_control_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return _read_reg(kobj_to_w1_slave(kobj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) W1_F29_REG_CONTROL_AND_STATUS, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #ifdef CONFIG_W1_SLAVE_DS2408_READBACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static bool optional_read_back_valid(struct w1_slave *sl, u8 expected)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) u8 w1_buf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (w1_reset_resume_command(sl->master))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) w1_buf[1] = W1_F29_REG_OUTPUT_LATCH_STATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) w1_buf[2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) w1_write_block(sl->master, w1_buf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return (w1_read_8(sl->master) == expected);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static bool optional_read_back_valid(struct w1_slave *sl, u8 expected)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static ssize_t output_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) u8 w1_buf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) unsigned int retries = W1_F29_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ssize_t bytes_written = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) dev_dbg(&sl->dev, "locking mutex for write_output");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) dev_dbg(&sl->dev, "mutex locked");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) w1_buf[0] = W1_F29_FUNC_CHANN_ACCESS_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) w1_buf[1] = *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) w1_buf[2] = ~(*buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) w1_write_block(sl->master, w1_buf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (w1_read_8(sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) optional_read_back_valid(sl, *buf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) bytes_written = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) goto out;
^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) if (w1_reset_resume_command(sl->master))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) goto out; /* unrecoverable error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /* try again, the slave is ready for a command */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) } while (--retries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) dev_dbg(&sl->dev, "%s, mutex unlocked retries:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) (bytes_written > 0) ? "succeeded" : "error", retries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return bytes_written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * Writing to the activity file resets the activity latches.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static ssize_t activity_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) unsigned int retries = W1_F29_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) w1_write_8(sl->master, W1_F29_FUNC_RESET_ACTIVITY_LATCHES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (w1_read_8(sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (w1_reset_resume_command(sl->master))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static ssize_t status_control_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) u8 w1_buf[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) unsigned int retries = W1_F29_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (count != 1 || off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) while (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) w1_buf[0] = W1_F29_FUNC_WRITE_COND_SEARCH_REG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) w1_buf[1] = W1_F29_REG_CONTROL_AND_STATUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) w1_buf[2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) w1_buf[3] = *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) w1_write_block(sl->master, w1_buf, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (w1_reset_resume_command(sl->master))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) w1_buf[1] = W1_F29_REG_CONTROL_AND_STATUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) w1_buf[2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) w1_write_block(sl->master, w1_buf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (w1_read_8(sl->master) == *buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) /* success! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * This is a special sequence we must do to ensure the P0 output is not stuck
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * in test mode. This is described in rev 2 of the ds2408's datasheet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * (http://datasheets.maximintegrated.com/en/ds/DS2408.pdf) under
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * "APPLICATION INFORMATION/Power-up timing".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int w1_f29_disable_test_mode(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) u8 magic[10] = {0x96, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) u64 rn = le64_to_cpu(*((u64*)&sl->reg_num));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) memcpy(&magic[1], &rn, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) magic[9] = 0x3C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) res = w1_reset_bus(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) w1_write_block(sl->master, magic, ARRAY_SIZE(magic));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) res = w1_reset_bus(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static BIN_ATTR_RO(state, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static BIN_ATTR_RW(output, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static BIN_ATTR_RW(activity, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static BIN_ATTR_RO(cond_search_mask, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static BIN_ATTR_RO(cond_search_polarity, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) static BIN_ATTR_RW(status_control, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static struct bin_attribute *w1_f29_bin_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) &bin_attr_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) &bin_attr_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) &bin_attr_activity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) &bin_attr_cond_search_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) &bin_attr_cond_search_polarity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) &bin_attr_status_control,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static const struct attribute_group w1_f29_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) .bin_attrs = w1_f29_bin_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static const struct attribute_group *w1_f29_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) &w1_f29_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static const struct w1_family_ops w1_f29_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) .add_slave = w1_f29_disable_test_mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) .groups = w1_f29_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static struct w1_family w1_family_29 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) .fid = W1_FAMILY_DS2408,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) .fops = &w1_f29_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) module_w1_family(w1_family_29);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) MODULE_AUTHOR("Jean-Francois Dagenais <dagenaisj@sonatest.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) MODULE_DESCRIPTION("w1 family 29 driver for DS2408 8 Pin IO");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2408));
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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