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_ds2433.c - w1 family 23 (DS2433) driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.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) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/crc16.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define CRC16_INIT		0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define CRC16_VALID		0xb001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define W1_EEPROM_DS2433	0x23
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define W1_EEPROM_SIZE		512
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define W1_PAGE_COUNT		16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define W1_PAGE_SIZE		32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define W1_PAGE_BITS		5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define W1_PAGE_MASK		0x1F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define W1_F23_TIME		300
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define W1_F23_READ_EEPROM	0xF0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define W1_F23_WRITE_SCRATCH	0x0F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define W1_F23_READ_SCRATCH	0xAA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define W1_F23_COPY_SCRATCH	0x55
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) struct w1_f23_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	u8	memory[W1_EEPROM_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	u32	validcrc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * Check the file size bounds and adjusts count as needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * 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  48)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static inline size_t w1_f23_fix_count(loff_t off, size_t count, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if (off > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if ((off + count) > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		return (size - off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int w1_f23_refresh_block(struct w1_slave *sl, struct w1_f23_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 				int block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	u8	wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	int	off = block * W1_PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (data->validcrc & (1 << block))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (w1_reset_select_slave(sl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		data->validcrc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	wrbuf[0] = W1_F23_READ_EEPROM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	wrbuf[1] = off & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	wrbuf[2] = off >> 8;
^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, &data->memory[off], W1_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	/* cache the block if the CRC is valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		data->validcrc |= (1 << block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			   struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			   loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct w1_slave *sl = kobj_to_w1_slave(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct w1_f23_data *data = sl->family_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	int i, min_page, max_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	u8 wrbuf[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	min_page = (off >> W1_PAGE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	max_page = (off + count - 1) >> W1_PAGE_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	for (i = min_page; i <= max_page; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		if (w1_f23_refresh_block(sl, data, i)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	memcpy(buf, &data->memory[off], count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #else 	/* CONFIG_W1_SLAVE_DS2433_CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	/* read directly from the EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (w1_reset_select_slave(sl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		goto out_up;
^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) 	wrbuf[0] = W1_F23_READ_EEPROM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	wrbuf[1] = off & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	wrbuf[2] = off >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	w1_write_block(sl->master, wrbuf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	w1_read_block(sl->master, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) out_up:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * Writes to the scratchpad and reads it back for verification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * Then copies the scratchpad to EEPROM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * The data must be on one page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * The master must be locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  * @param sl	The slave structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  * @param addr	Address for the write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  * @param len   length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)  * @param data	The data to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)  * @return	0=Success -1=failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	struct w1_f23_data *f23 = sl->family_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	u8 wrbuf[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	u8 rdbuf[W1_PAGE_SIZE + 3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	u8 es = (addr + len - 1) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	/* Write the data to the scratchpad */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	wrbuf[0] = W1_F23_WRITE_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	wrbuf[1] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	wrbuf[2] = addr >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	w1_write_block(sl->master, wrbuf, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	w1_write_block(sl->master, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	/* Read the scratchpad and verify */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	w1_write_8(sl->master, W1_F23_READ_SCRATCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	w1_read_block(sl->master, rdbuf, len + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	/* Compare what was read against the data written */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	    (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	/* Copy the scratchpad to EEPROM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (w1_reset_select_slave(sl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	wrbuf[0] = W1_F23_COPY_SCRATCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	wrbuf[3] = es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	w1_write_block(sl->master, wrbuf, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/* Sleep for 5 ms to wait for the write to complete */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	msleep(5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	/* Reset the bus to wake up the EEPROM (this may not be needed) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	w1_reset_bus(sl->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	f23->validcrc &= ~(1 << (addr >> W1_PAGE_BITS));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #endif
^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, idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	/* can only write full blocks in cached mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			(int)off, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	/* make sure the block CRCs are valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	for (idx = 0; idx < count; idx += W1_PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) != CRC16_VALID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			dev_err(&sl->dev, "bad CRC at offset %d\n", (int)off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	/* Can only write data to one page at a time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	while (idx < count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		addr = off + idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		if (len > (count - idx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			len = count - idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		if (w1_f23_write(sl, addr, len, &buf[idx]) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			count = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			goto out_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		idx += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) out_up:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	return count;
^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) static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static struct bin_attribute *w1_f23_bin_attributes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	&bin_attr_eeprom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	NULL,
^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) static const struct attribute_group w1_f23_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	.bin_attrs = w1_f23_bin_attributes,
^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 const struct attribute_group *w1_f23_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	&w1_f23_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static int w1_f23_add_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct w1_f23_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	data = kzalloc(sizeof(struct w1_f23_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	sl->family_data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static void w1_f23_remove_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) #ifdef CONFIG_W1_SLAVE_DS2433_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	kfree(sl->family_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	sl->family_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) #endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static const struct w1_family_ops w1_f23_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	.add_slave      = w1_f23_add_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	.remove_slave   = w1_f23_remove_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	.groups		= w1_f23_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static struct w1_family w1_family_23 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	.fid = W1_EEPROM_DS2433,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	.fops = &w1_f23_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) module_w1_family(w1_family_23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433));