^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_ds2430.c - w1 family 14 (DS2430) driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) **
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2019 Angelo Dureghello <angelo.dureghello@timesys.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Cloned and modified from ds2431
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (c) 2008 Bernhard Weirich <bernhard.weirich@riedel.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define W1_EEPROM_DS2430 0x14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define W1_F14_EEPROM_SIZE 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define W1_F14_PAGE_COUNT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define W1_F14_PAGE_BITS 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define W1_F14_PAGE_SIZE (1 << W1_F14_PAGE_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define W1_F14_PAGE_MASK 0x1F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define W1_F14_SCRATCH_BITS 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define W1_F14_SCRATCH_SIZE (1 << W1_F14_SCRATCH_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define W1_F14_SCRATCH_MASK (W1_F14_SCRATCH_SIZE-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define W1_F14_READ_EEPROM 0xF0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define W1_F14_WRITE_SCRATCH 0x0F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define W1_F14_READ_SCRATCH 0xAA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define W1_F14_COPY_SCRATCH 0x55
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define W1_F14_VALIDATION_KEY 0xa5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define W1_F14_TPROG_MS 11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define W1_F14_READ_RETRIES 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define W1_F14_READ_MAXLEN W1_F14_SCRATCH_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Check the file size bounds and adjusts count as needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * This would not be needed if the file size didn't reset to 0 after a write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static inline size_t w1_f14_fix_count(loff_t off, size_t count, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (off > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if ((off + count) > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return size - off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * Read a block from W1 ROM two times and compares the results.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * If they are equal they are returned, otherwise the read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * is repeated W1_F14_READ_RETRIES times.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * count must not exceed W1_F14_READ_MAXLEN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static int w1_f14_readblock(struct w1_slave *sl, int off, int count, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) u8 wrbuf[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) u8 cmp[W1_F14_READ_MAXLEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int tries = W1_F14_READ_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) wrbuf[0] = W1_F14_READ_EEPROM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) wrbuf[1] = off & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) w1_write_block(sl->master, wrbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) w1_read_block(sl->master, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) w1_write_block(sl->master, wrbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) w1_read_block(sl->master, cmp, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (!memcmp(cmp, buf, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) } while (--tries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) dev_err(&sl->dev, "proof reading failed %d times\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) W1_F14_READ_RETRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return -1;
^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) static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int todo = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) count = w1_f14_fix_count(off, count, W1_F14_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* read directly from the EEPROM in chunks of W1_F14_READ_MAXLEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) while (todo > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int block_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (todo >= W1_F14_READ_MAXLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) block_read = W1_F14_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) block_read = todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (w1_f14_readblock(sl, off, block_read, buf) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) todo -= W1_F14_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) buf += W1_F14_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) off += W1_F14_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^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) * Writes to the scratchpad and reads it back for verification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * Then copies the scratchpad to EEPROM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * The data must be aligned at W1_F14_SCRATCH_SIZE bytes and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * must be W1_F14_SCRATCH_SIZE bytes long.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * The master must be locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * @param sl The slave structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * @param addr Address for the write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * @param len length must be <= (W1_F14_PAGE_SIZE - (addr & W1_F14_PAGE_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * @param data The data to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * @return 0=Success -1=failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int w1_f14_write(struct w1_slave *sl, int addr, int len, const u8 *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int tries = W1_F14_READ_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) u8 wrbuf[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) u8 rdbuf[W1_F14_SCRATCH_SIZE + 3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /* Write the data to the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) wrbuf[0] = W1_F14_WRITE_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) wrbuf[1] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) w1_write_block(sl->master, wrbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) w1_write_block(sl->master, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /* Read the scratchpad and verify */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) w1_write_8(sl->master, W1_F14_READ_SCRATCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) w1_read_block(sl->master, rdbuf, len + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * Compare what was read against the data written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * Note: on read scratchpad, device returns 2 bulk 0xff bytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * to be discarded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if ((memcmp(data, &rdbuf[2], len) != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (--tries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) dev_err(&sl->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) "could not write to eeprom, scratchpad compare failed %d times\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) W1_F14_READ_RETRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* Copy the scratchpad to EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) wrbuf[0] = W1_F14_COPY_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) wrbuf[1] = W1_F14_VALIDATION_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) w1_write_block(sl->master, wrbuf, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* Sleep for tprog ms to wait for the write to complete */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) msleep(W1_F14_TPROG_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* Reset the bus to wake up the EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) w1_reset_bus(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) int addr, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) int copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) count = w1_f14_fix_count(off, count, W1_F14_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /* Can only write data in blocks of the size of the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) addr = off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) len = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) while (len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /* if len too short or addr not aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (len < W1_F14_SCRATCH_SIZE || addr & W1_F14_SCRATCH_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) char tmp[W1_F14_SCRATCH_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* read the block and update the parts to be written */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (w1_f14_readblock(sl, addr & ~W1_F14_SCRATCH_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) W1_F14_SCRATCH_SIZE, tmp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* copy at most to the boundary of the PAGE or len */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) copy = W1_F14_SCRATCH_SIZE -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) (addr & W1_F14_SCRATCH_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (copy > len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) copy = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) memcpy(&tmp[addr & W1_F14_SCRATCH_MASK], buf, copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (w1_f14_write(sl, addr & ~W1_F14_SCRATCH_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) W1_F14_SCRATCH_SIZE, tmp) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) copy = W1_F14_SCRATCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (w1_f14_write(sl, addr, copy, buf) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) buf += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) addr += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) len -= copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) out_up:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static BIN_ATTR_RW(eeprom, W1_F14_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static struct bin_attribute *w1_f14_bin_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) &bin_attr_eeprom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static const struct attribute_group w1_f14_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) .bin_attrs = w1_f14_bin_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static const struct attribute_group *w1_f14_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) &w1_f14_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static const struct w1_family_ops w1_f14_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) .groups = w1_f14_groups,
^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) static struct w1_family w1_family_14 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) .fid = W1_EEPROM_DS2430,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) .fops = &w1_f14_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) module_w1_family(w1_family_14);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) MODULE_AUTHOR("Angelo Dureghello <angelo.dureghello@timesys.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) MODULE_DESCRIPTION("w1 family 14 driver for DS2430, 256b EEPROM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2430));
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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