Orange Pi5 kernel

^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_ds2805 - w1 family 0d (DS28E05) driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2016 Andrew Worsley amworsley@gmail.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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define W1_EEPROM_DS2805       0x0D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define W1_F0D_EEPROM_SIZE		128
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define W1_F0D_PAGE_BITS		3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define W1_F0D_PAGE_SIZE		(1<<W1_F0D_PAGE_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define W1_F0D_PAGE_MASK		0x0F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define W1_F0D_SCRATCH_BITS  1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define W1_F0D_SCRATCH_SIZE  (1<<W1_F0D_SCRATCH_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define W1_F0D_SCRATCH_MASK  (W1_F0D_SCRATCH_SIZE-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define W1_F0D_READ_EEPROM	0xF0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define W1_F0D_WRITE_EEPROM	0x55
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define W1_F0D_RELEASE		0xFF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define W1_F0D_CS_OK		0xAA /* Chip Status Ok */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define W1_F0D_TPROG_MS		16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define W1_F0D_READ_RETRIES		10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define W1_F0D_READ_MAXLEN		W1_F0D_EEPROM_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * Check the file size bounds and adjusts count as needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * 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  42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static inline size_t w1_f0d_fix_count(loff_t off, size_t count, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	if (off > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if ((off + count) > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		return size - off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * Read a block from W1 ROM two times and compares the results.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * If they are equal they are returned, otherwise the read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * is repeated W1_F0D_READ_RETRIES times.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * count must not exceed W1_F0D_READ_MAXLEN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int w1_f0d_readblock(struct w1_slave *sl, int off, int count, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	u8 wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	u8 cmp[W1_F0D_READ_MAXLEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	int tries = W1_F0D_READ_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		wrbuf[0] = W1_F0D_READ_EEPROM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		wrbuf[1] = off & 0x7f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		wrbuf[2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		w1_read_block(sl->master, buf, count);
^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) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		w1_read_block(sl->master, cmp, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		if (!memcmp(cmp, buf, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	} while (--tries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	dev_err(&sl->dev, "proof reading failed %d times\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			W1_F0D_READ_RETRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static ssize_t w1_f0d_read_bin(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			       struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			       char *buf, loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	int todo = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	count = w1_f0d_fix_count(off, count, W1_F0D_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	mutex_lock(&sl->master->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	/* read directly from the EEPROM in chunks of W1_F0D_READ_MAXLEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	while (todo > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		int block_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		if (todo >= W1_F0D_READ_MAXLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			block_read = W1_F0D_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			block_read = todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		if (w1_f0d_readblock(sl, off, block_read, buf) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		todo -= W1_F0D_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		buf += W1_F0D_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		off += W1_F0D_READ_MAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	mutex_unlock(&sl->master->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^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)  * Writes to the scratchpad and reads it back for verification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * Then copies the scratchpad to EEPROM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * The data must be aligned at W1_F0D_SCRATCH_SIZE bytes and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * must be W1_F0D_SCRATCH_SIZE bytes long.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * The master must be locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * @param sl	The slave structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * @param addr	Address for the write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * @param len   length must be <= (W1_F0D_PAGE_SIZE - (addr & W1_F0D_PAGE_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * @param data	The data to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * @return	0=Success -1=failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static int w1_f0d_write(struct w1_slave *sl, int addr, int len, const u8 *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	int tries = W1_F0D_READ_RETRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	u8 wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	u8 rdbuf[W1_F0D_SCRATCH_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	u8 cs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if ((addr & 1) || (len != 2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		dev_err(&sl->dev, "%s: bad addr/len -  addr=%#x len=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		    __func__, addr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* Write the data to the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	wrbuf[0] = W1_F0D_WRITE_EEPROM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	wrbuf[1] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	wrbuf[2] = 0xff; /* ?? from Example */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	w1_write_block(sl->master, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	w1_read_block(sl->master, rdbuf, sizeof(rdbuf));
^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) 	if ((rdbuf[0] != data[0]) || (rdbuf[1] != data[1])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		if (--tries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		dev_err(&sl->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			"could not write to eeprom, scratchpad compare failed %d times\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			W1_F0D_READ_RETRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		pr_info("%s: rdbuf = %#x %#x data = %#x %#x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		    __func__, rdbuf[0], rdbuf[1], data[0], data[1]);
^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) 	/* Trigger write out to EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	w1_write_8(sl->master, W1_F0D_RELEASE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/* Sleep for tprog ms to wait for the write to complete */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	msleep(W1_F0D_TPROG_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/* Check CS (Command Status) == 0xAA ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	cs = w1_read_8(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (cs != W1_F0D_CS_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		dev_err(&sl->dev, "save to eeprom failed = CS=%#x\n", cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static ssize_t w1_f0d_write_bin(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 				struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				char *buf, loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	int addr, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	int copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	count = w1_f0d_fix_count(off, count, W1_F0D_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	mutex_lock(&sl->master->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	/* Can only write data in blocks of the size of the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	addr = off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	len = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	while (len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		/* if len too short or addr not aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		if (len < W1_F0D_SCRATCH_SIZE || addr & W1_F0D_SCRATCH_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			char tmp[W1_F0D_SCRATCH_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			/* read the block and update the parts to be written */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			if (w1_f0d_readblock(sl, addr & ~W1_F0D_SCRATCH_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 					W1_F0D_SCRATCH_SIZE, tmp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 				goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			/* copy at most to the boundary of the PAGE or len */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			copy = W1_F0D_SCRATCH_SIZE -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 				(addr & W1_F0D_SCRATCH_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			if (copy > len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 				copy = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			memcpy(&tmp[addr & W1_F0D_SCRATCH_MASK], buf, copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			if (w1_f0d_write(sl, addr & ~W1_F0D_SCRATCH_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 					W1_F0D_SCRATCH_SIZE, tmp) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 				count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 				goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			copy = W1_F0D_SCRATCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			if (w1_f0d_write(sl, addr, copy, buf) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 				count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 				goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		buf += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		addr += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		len -= copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) out_up:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	mutex_unlock(&sl->master->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static struct bin_attribute w1_f0d_bin_attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	.attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		.name = "eeprom",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		.mode = S_IRUGO | S_IWUSR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	.size = W1_F0D_EEPROM_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	.read = w1_f0d_read_bin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	.write = w1_f0d_write_bin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static int w1_f0d_add_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	return sysfs_create_bin_file(&sl->dev.kobj, &w1_f0d_bin_attr);
^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) static void w1_f0d_remove_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	sysfs_remove_bin_file(&sl->dev.kobj, &w1_f0d_bin_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static const struct w1_family_ops w1_f0d_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	.add_slave      = w1_f0d_add_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	.remove_slave   = w1_f0d_remove_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static struct w1_family w1_family_0d = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	.fid = W1_EEPROM_DS2805,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	.fops = &w1_f0d_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static int __init w1_f0d_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	pr_info("%s()\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	return w1_register_family(&w1_family_0d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static void __exit w1_f0d_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	pr_info("%s()\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	w1_unregister_family(&w1_family_0d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) module_init(w1_f0d_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) module_exit(w1_f0d_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) MODULE_AUTHOR("Andrew Worsley amworsley@gmail.com");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) MODULE_DESCRIPTION("w1 family 0d driver for DS2805, 1kb EEPROM");