^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_ds2431.c - w1 family 2d (DS2431) driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2008 Bernhard Weirich <bernhard.weirich@riedel.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Heavily inspired by w1_DS2433 driver from Ben Gardner <bgardner@wabtec.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define W1_EEPROM_DS2431 0x2D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define W1_F2D_EEPROM_SIZE 128
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define W1_F2D_PAGE_COUNT 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define W1_F2D_PAGE_BITS 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define W1_F2D_PAGE_SIZE (1<<W1_F2D_PAGE_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define W1_F2D_PAGE_MASK 0x1F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define W1_F2D_SCRATCH_BITS 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define W1_F2D_SCRATCH_SIZE (1<<W1_F2D_SCRATCH_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define W1_F2D_SCRATCH_MASK (W1_F2D_SCRATCH_SIZE-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define W1_F2D_READ_EEPROM 0xF0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define W1_F2D_WRITE_SCRATCH 0x0F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define W1_F2D_READ_SCRATCH 0xAA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define W1_F2D_COPY_SCRATCH 0x55
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define W1_F2D_TPROG_MS 11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define W1_F2D_READ_RETRIES 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define W1_F2D_READ_MAXLEN 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Check the file size bounds and adjusts count as needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * 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 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static inline size_t w1_f2d_fix_count(loff_t off, size_t count, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (off > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if ((off + count) > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return size - off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^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) * Read a block from W1 ROM two times and compares the results.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * If they are equal they are returned, otherwise the read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * is repeated W1_F2D_READ_RETRIES times.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * count must not exceed W1_F2D_READ_MAXLEN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int w1_f2d_readblock(struct w1_slave *sl, int off, int count, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) u8 wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) u8 cmp[W1_F2D_READ_MAXLEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int tries = W1_F2D_READ_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) wrbuf[0] = W1_F2D_READ_EEPROM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) wrbuf[1] = off & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) wrbuf[2] = off >> 8;
^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, 3);
^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, 3);
^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_F2D_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_f2d_fix_count(off, count, W1_F2D_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_F2D_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_F2D_READ_MAXLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) block_read = W1_F2D_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_f2d_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_F2D_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) buf += W1_F2D_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) off += W1_F2D_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_F2D_SCRATCH_SIZE bytes and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * must be W1_F2D_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_F2D_PAGE_SIZE - (addr & W1_F2D_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_f2d_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_F2D_READ_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) u8 wrbuf[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) u8 rdbuf[W1_F2D_SCRATCH_SIZE + 3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) u8 es = (addr + len - 1) % W1_F2D_SCRATCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* Write the data to the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) wrbuf[0] = W1_F2D_WRITE_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) wrbuf[1] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) wrbuf[2] = addr >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) w1_write_block(sl->master, wrbuf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) w1_write_block(sl->master, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* Read the scratchpad and verify */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) w1_write_8(sl->master, W1_F2D_READ_SCRATCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) w1_read_block(sl->master, rdbuf, len + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Compare what was read against the data written */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (--tries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) dev_err(&sl->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) "could not write to eeprom, scratchpad compare failed %d times\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) W1_F2D_READ_RETRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /* Copy the scratchpad to EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) wrbuf[0] = W1_F2D_COPY_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) wrbuf[3] = es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) w1_write_block(sl->master, wrbuf, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* Sleep for tprog ms to wait for the write to complete */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) msleep(W1_F2D_TPROG_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* Reset the bus to wake up the EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) w1_reset_bus(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) int addr, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) int copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) count = w1_f2d_fix_count(off, count, W1_F2D_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /* Can only write data in blocks of the size of the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) addr = off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) len = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) while (len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* if len too short or addr not aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (len < W1_F2D_SCRATCH_SIZE || addr & W1_F2D_SCRATCH_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) char tmp[W1_F2D_SCRATCH_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* read the block and update the parts to be written */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (w1_f2d_readblock(sl, addr & ~W1_F2D_SCRATCH_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) W1_F2D_SCRATCH_SIZE, tmp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) /* copy at most to the boundary of the PAGE or len */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) copy = W1_F2D_SCRATCH_SIZE -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) (addr & W1_F2D_SCRATCH_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (copy > len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) copy = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) memcpy(&tmp[addr & W1_F2D_SCRATCH_MASK], buf, copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (w1_f2d_write(sl, addr & ~W1_F2D_SCRATCH_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) W1_F2D_SCRATCH_SIZE, tmp) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) copy = W1_F2D_SCRATCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (w1_f2d_write(sl, addr, copy, buf) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) buf += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) addr += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) len -= copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) out_up:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static BIN_ATTR_RW(eeprom, W1_F2D_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static struct bin_attribute *w1_f2d_bin_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) &bin_attr_eeprom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static const struct attribute_group w1_f2d_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) .bin_attrs = w1_f2d_bin_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static const struct attribute_group *w1_f2d_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) &w1_f2d_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static const struct w1_family_ops w1_f2d_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) .groups = w1_f2d_groups,
^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) static struct w1_family w1_family_2d = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) .fid = W1_EEPROM_DS2431,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) .fops = &w1_f2d_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) module_w1_family(w1_family_2d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) MODULE_AUTHOR("Bernhard Weirich <bernhard.weirich@riedel.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) MODULE_DESCRIPTION("w1 family 2d driver for DS2431, 1kb EEPROM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2431));
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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