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@ -0,0 +1,469 @@
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/*
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* w1_ds28e04.c - w1 family 1C (DS28E04) driver
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*
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* Copyright (c) 2012 Markus Franke <franke.m@sebakmt.com>
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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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/slab.h>
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#include <linux/crc16.h>
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#include <linux/uaccess.h>
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#define CRC16_INIT 0
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#define CRC16_VALID 0xb001
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#include "../w1.h"
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#include "../w1_int.h"
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#include "../w1_family.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>");
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MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO");
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/* Allow the strong pullup to be disabled, but default to enabled.
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* If it was disabled a parasite powered device might not get the required
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* current to copy the data from the scratchpad to EEPROM. If it is enabled
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* parasite powered devices have a better chance of getting the current
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* required.
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*/
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static int w1_strong_pullup = 1;
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module_param_named(strong_pullup, w1_strong_pullup, int, 0);
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/* enable/disable CRC checking on DS28E04-100 memory accesses */
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static char w1_enable_crccheck = 1;
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#define W1_EEPROM_SIZE 512
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#define W1_PAGE_COUNT 16
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#define W1_PAGE_SIZE 32
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#define W1_PAGE_BITS 5
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#define W1_PAGE_MASK 0x1F
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#define W1_F1C_READ_EEPROM 0xF0
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#define W1_F1C_WRITE_SCRATCH 0x0F
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#define W1_F1C_READ_SCRATCH 0xAA
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#define W1_F1C_COPY_SCRATCH 0x55
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#define W1_F1C_ACCESS_WRITE 0x5A
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#define W1_1C_REG_LOGIC_STATE 0x220
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struct w1_f1C_data {
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u8 memory[W1_EEPROM_SIZE];
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u32 validcrc;
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};
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/**
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* Check the file size bounds and adjusts count as needed.
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* This would not be needed if the file size didn't reset to 0 after a write.
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*/
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static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size)
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{
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if (off > size)
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return 0;
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if ((off + count) > size)
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return size - off;
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return count;
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}
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static int w1_f1C_refresh_block(struct w1_slave *sl, struct w1_f1C_data *data,
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int block)
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{
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u8 wrbuf[3];
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int off = block * W1_PAGE_SIZE;
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if (data->validcrc & (1 << block))
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return 0;
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if (w1_reset_select_slave(sl)) {
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data->validcrc = 0;
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return -EIO;
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}
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wrbuf[0] = W1_F1C_READ_EEPROM;
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wrbuf[1] = off & 0xff;
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wrbuf[2] = off >> 8;
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w1_write_block(sl->master, wrbuf, 3);
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w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE);
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/* cache the block if the CRC is valid */
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if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID)
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data->validcrc |= (1 << block);
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return 0;
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}
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static int w1_f1C_read(struct w1_slave *sl, int addr, int len, char *data)
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{
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u8 wrbuf[3];
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/* read directly from the EEPROM */
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if (w1_reset_select_slave(sl))
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return -EIO;
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wrbuf[0] = W1_F1C_READ_EEPROM;
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wrbuf[1] = addr & 0xff;
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wrbuf[2] = addr >> 8;
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w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
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return w1_read_block(sl->master, data, len);
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}
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static ssize_t w1_f1C_read_bin(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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struct w1_f1C_data *data = sl->family_data;
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int i, min_page, max_page;
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count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE);
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if (count == 0)
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return 0;
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mutex_lock(&sl->master->mutex);
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if (w1_enable_crccheck) {
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min_page = (off >> W1_PAGE_BITS);
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max_page = (off + count - 1) >> W1_PAGE_BITS;
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for (i = min_page; i <= max_page; i++) {
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if (w1_f1C_refresh_block(sl, data, i)) {
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count = -EIO;
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goto out_up;
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}
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}
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memcpy(buf, &data->memory[off], count);
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} else {
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count = w1_f1C_read(sl, off, count, buf);
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}
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out_up:
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mutex_unlock(&sl->master->mutex);
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return count;
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}
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/**
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* Writes to the scratchpad and reads it back for verification.
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* Then copies the scratchpad to EEPROM.
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* The data must be on one page.
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* The master must be locked.
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*
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* @param sl The slave structure
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* @param addr Address for the write
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* @param len length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK))
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* @param data The data to write
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* @return 0=Success -1=failure
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*/
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static int w1_f1C_write(struct w1_slave *sl, int addr, int len, const u8 *data)
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{
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u8 wrbuf[4];
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u8 rdbuf[W1_PAGE_SIZE + 3];
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u8 es = (addr + len - 1) & 0x1f;
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unsigned int tm = 10;
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int i;
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struct w1_f1C_data *f1C = sl->family_data;
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/* Write the data to the scratchpad */
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if (w1_reset_select_slave(sl))
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return -1;
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wrbuf[0] = W1_F1C_WRITE_SCRATCH;
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wrbuf[1] = addr & 0xff;
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wrbuf[2] = addr >> 8;
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w1_write_block(sl->master, wrbuf, 3);
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w1_write_block(sl->master, data, len);
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/* Read the scratchpad and verify */
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if (w1_reset_select_slave(sl))
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return -1;
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w1_write_8(sl->master, W1_F1C_READ_SCRATCH);
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w1_read_block(sl->master, rdbuf, len + 3);
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/* Compare what was read against the data written */
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if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
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(rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0))
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return -1;
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/* Copy the scratchpad to EEPROM */
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if (w1_reset_select_slave(sl))
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return -1;
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wrbuf[0] = W1_F1C_COPY_SCRATCH;
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wrbuf[3] = es;
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for (i = 0; i < sizeof(wrbuf); ++i) {
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/* issue 10ms strong pullup (or delay) on the last byte
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for writing the data from the scratchpad to EEPROM */
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if (w1_strong_pullup && i == sizeof(wrbuf)-1)
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w1_next_pullup(sl->master, tm);
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w1_write_8(sl->master, wrbuf[i]);
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}
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if (!w1_strong_pullup)
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msleep(tm);
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if (w1_enable_crccheck) {
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/* invalidate cached data */
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f1C->validcrc &= ~(1 << (addr >> W1_PAGE_BITS));
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}
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/* Reset the bus to wake up the EEPROM (this may not be needed) */
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w1_reset_bus(sl->master);
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return 0;
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}
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static ssize_t w1_f1C_write_bin(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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int addr, len, idx;
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count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE);
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if (count == 0)
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return 0;
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if (w1_enable_crccheck) {
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/* can only write full blocks in cached mode */
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if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) {
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dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n",
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(int)off, count);
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return -EINVAL;
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}
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/* make sure the block CRCs are valid */
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for (idx = 0; idx < count; idx += W1_PAGE_SIZE) {
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if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE)
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!= CRC16_VALID) {
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dev_err(&sl->dev, "bad CRC at offset %d\n",
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(int)off);
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return -EINVAL;
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}
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}
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}
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mutex_lock(&sl->master->mutex);
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/* Can only write data to one page at a time */
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idx = 0;
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while (idx < count) {
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addr = off + idx;
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len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK);
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if (len > (count - idx))
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len = count - idx;
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if (w1_f1C_write(sl, addr, len, &buf[idx]) < 0) {
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count = -EIO;
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goto out_up;
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}
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idx += len;
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}
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out_up:
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mutex_unlock(&sl->master->mutex);
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return count;
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}
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static ssize_t w1_f1C_read_pio(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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int ret;
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/* check arguments */
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if (off != 0 || count != 1 || buf == NULL)
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return -EINVAL;
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mutex_lock(&sl->master->mutex);
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ret = w1_f1C_read(sl, W1_1C_REG_LOGIC_STATE, count, buf);
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mutex_unlock(&sl->master->mutex);
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return ret;
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}
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static ssize_t w1_f1C_write_pio(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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u8 wrbuf[3];
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u8 ack;
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/* check arguments */
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if (off != 0 || count != 1 || buf == NULL)
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return -EINVAL;
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mutex_lock(&sl->master->mutex);
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/* Write the PIO data */
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if (w1_reset_select_slave(sl)) {
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mutex_unlock(&sl->master->mutex);
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return -1;
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}
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/* set bit 7..2 to value '1' */
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*buf = *buf | 0xFC;
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|
|
|
wrbuf[0] = W1_F1C_ACCESS_WRITE;
|
|
|
|
|
wrbuf[1] = *buf;
|
|
|
|
|
wrbuf[2] = ~(*buf);
|
|
|
|
|
w1_write_block(sl->master, wrbuf, 3);
|
|
|
|
|
|
|
|
|
|
w1_read_block(sl->master, &ack, sizeof(ack));
|
|
|
|
|
|
|
|
|
|
mutex_unlock(&sl->master->mutex);
|
|
|
|
|
|
|
|
|
|
/* check for acknowledgement */
|
|
|
|
|
if (ack != 0xAA)
|
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t w1_f1C_show_crccheck(struct device *dev,
|
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
|
{
|
|
|
|
|
if (put_user(w1_enable_crccheck + 0x30, buf))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
return sizeof(w1_enable_crccheck);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t w1_f1C_store_crccheck(struct device *dev,
|
|
|
|
|
struct device_attribute *attr,
|
|
|
|
|
const char *buf, size_t count)
|
|
|
|
|
{
|
|
|
|
|
char val;
|
|
|
|
|
|
|
|
|
|
if (count != 1 || !buf)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
|
|
if (get_user(val, buf))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
/* convert to decimal */
|
|
|
|
|
val = val - 0x30;
|
|
|
|
|
if (val != 0 && val != 1)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
|
|
/* set the new value */
|
|
|
|
|
w1_enable_crccheck = val;
|
|
|
|
|
|
|
|
|
|
return sizeof(w1_enable_crccheck);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#define NB_SYSFS_BIN_FILES 2
|
|
|
|
|
static struct bin_attribute w1_f1C_bin_attr[NB_SYSFS_BIN_FILES] = {
|
|
|
|
|
{
|
|
|
|
|
.attr = {
|
|
|
|
|
.name = "eeprom",
|
|
|
|
|
.mode = S_IRUGO | S_IWUSR,
|
|
|
|
|
},
|
|
|
|
|
.size = W1_EEPROM_SIZE,
|
|
|
|
|
.read = w1_f1C_read_bin,
|
|
|
|
|
.write = w1_f1C_write_bin,
|
|
|
|
|
},
|
|
|
|
|
{
|
|
|
|
|
.attr = {
|
|
|
|
|
.name = "pio",
|
|
|
|
|
.mode = S_IRUGO | S_IWUSR,
|
|
|
|
|
},
|
|
|
|
|
.size = 1,
|
|
|
|
|
.read = w1_f1C_read_pio,
|
|
|
|
|
.write = w1_f1C_write_pio,
|
|
|
|
|
}
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static DEVICE_ATTR(crccheck, S_IWUSR | S_IRUGO,
|
|
|
|
|
w1_f1C_show_crccheck, w1_f1C_store_crccheck);
|
|
|
|
|
|
|
|
|
|
static int w1_f1C_add_slave(struct w1_slave *sl)
|
|
|
|
|
{
|
|
|
|
|
int err = 0;
|
|
|
|
|
int i;
|
|
|
|
|
struct w1_f1C_data *data = NULL;
|
|
|
|
|
|
|
|
|
|
if (w1_enable_crccheck) {
|
|
|
|
|
data = kzalloc(sizeof(struct w1_f1C_data), GFP_KERNEL);
|
|
|
|
|
if (!data)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
sl->family_data = data;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* create binary sysfs attributes */
|
|
|
|
|
for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i)
|
|
|
|
|
err = sysfs_create_bin_file(
|
|
|
|
|
&sl->dev.kobj, &(w1_f1C_bin_attr[i]));
|
|
|
|
|
|
|
|
|
|
if (!err) {
|
|
|
|
|
/* create device attributes */
|
|
|
|
|
err = device_create_file(&sl->dev, &dev_attr_crccheck);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (err) {
|
|
|
|
|
/* remove binary sysfs attributes */
|
|
|
|
|
for (i = 0; i < NB_SYSFS_BIN_FILES; ++i)
|
|
|
|
|
sysfs_remove_bin_file(
|
|
|
|
|
&sl->dev.kobj, &(w1_f1C_bin_attr[i]));
|
|
|
|
|
|
|
|
|
|
kfree(data);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void w1_f1C_remove_slave(struct w1_slave *sl)
|
|
|
|
|
{
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
kfree(sl->family_data);
|
|
|
|
|
sl->family_data = NULL;
|
|
|
|
|
|
|
|
|
|
/* remove device attributes */
|
|
|
|
|
device_remove_file(&sl->dev, &dev_attr_crccheck);
|
|
|
|
|
|
|
|
|
|
/* remove binary sysfs attributes */
|
|
|
|
|
for (i = 0; i < NB_SYSFS_BIN_FILES; ++i)
|
|
|
|
|
sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i]));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct w1_family_ops w1_f1C_fops = {
|
|
|
|
|
.add_slave = w1_f1C_add_slave,
|
|
|
|
|
.remove_slave = w1_f1C_remove_slave,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static struct w1_family w1_family_1C = {
|
|
|
|
|
.fid = W1_FAMILY_DS28E04,
|
|
|
|
|
.fops = &w1_f1C_fops,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static int __init w1_f1C_init(void)
|
|
|
|
|
{
|
|
|
|
|
return w1_register_family(&w1_family_1C);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __exit w1_f1C_fini(void)
|
|
|
|
|
{
|
|
|
|
|
w1_unregister_family(&w1_family_1C);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
module_init(w1_f1C_init);
|
|
|
|
|
module_exit(w1_f1C_fini);
|
Markus Franke