1 // SPDX-License-Identifier: GPL-2.0-only
3  *	w1_ds28e04.c - w1 family 1C (DS28E04) driver
26  * If it was disabled a parasite powered device might not get the required
28  * parasite powered devices have a better chance of getting the current
34 /* enable/disable CRC checking on DS28E04-100 memory accesses */
60 static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size)  in w1_f1C_fix_count()  argument
62 	if (off > size)  in w1_f1C_fix_count()
65 	if ((off + count) > size)  in w1_f1C_fix_count()
66 		return size - off;  in w1_f1C_fix_count()
75 	int	off = block * W1_PAGE_SIZE;  in w1_f1C_refresh_block()  local
77 	if (data->validcrc & (1 << block))  in w1_f1C_refresh_block()
81 		data->validcrc = 0;  in w1_f1C_refresh_block()
82 		return -EIO;  in w1_f1C_refresh_block()
86 	wrbuf[1] = off & 0xff;  in w1_f1C_refresh_block()
87 	wrbuf[2] = off >> 8;  in w1_f1C_refresh_block()
88 	w1_write_block(sl->master, wrbuf, 3);  in w1_f1C_refresh_block()
89 	w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE);  in w1_f1C_refresh_block()
92 	if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID)  in w1_f1C_refresh_block()
93 		data->validcrc |= (1 << block);  in w1_f1C_refresh_block()
104 		return -EIO;  in w1_f1C_read()
110 	w1_write_block(sl->master, wrbuf, sizeof(wrbuf));  in w1_f1C_read()
111 	return w1_read_block(sl->master, data, len);  in w1_f1C_read()
116 			   loff_t off, size_t count)  in eeprom_read()  argument
119 	struct w1_f1C_data *data = sl->family_data;  in eeprom_read()
122 	count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE);  in eeprom_read()
126 	mutex_lock(&sl->master->mutex);  in eeprom_read()
129 		min_page = (off >> W1_PAGE_BITS);  in eeprom_read()
130 		max_page = (off + count - 1) >> W1_PAGE_BITS;  in eeprom_read()
133 				count = -EIO;  in eeprom_read()
137 		memcpy(buf, &data->memory[off], count);  in eeprom_read()
139 		count = w1_f1C_read(sl, off, count, buf);  in eeprom_read()
143 	mutex_unlock(&sl->master->mutex);  in eeprom_read()
149  * w1_f1C_write() - Writes to the scratchpad and reads it back for verification.
152  * @len:	length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK))
159  * Return:	0=Success, -1=failure
165 	u8 es = (addr + len - 1) & 0x1f;  in w1_f1C_write()
168 	struct w1_f1C_data *f1C = sl->family_data;  in w1_f1C_write()
172 		return -1;  in w1_f1C_write()
178 	w1_write_block(sl->master, wrbuf, 3);  in w1_f1C_write()
179 	w1_write_block(sl->master, data, len);  in w1_f1C_write()
183 		return -1;  in w1_f1C_write()
185 	w1_write_8(sl->master, W1_F1C_READ_SCRATCH);  in w1_f1C_write()
186 	w1_read_block(sl->master, rdbuf, len + 3);  in w1_f1C_write()
191 		return -1;  in w1_f1C_write()
195 		return -1;  in w1_f1C_write()
205 		if (w1_strong_pullup && i == sizeof(wrbuf)-1)  in w1_f1C_write()
206 			w1_next_pullup(sl->master, tm);  in w1_f1C_write()
208 		w1_write_8(sl->master, wrbuf[i]);  in w1_f1C_write()
216 		f1C->validcrc &= ~(1 << (addr >> W1_PAGE_BITS));  in w1_f1C_write()
220 	w1_reset_bus(sl->master);  in w1_f1C_write()
227 			    loff_t off, size_t count)  in eeprom_write()  argument
233 	count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE);  in eeprom_write()
239 		if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) {  in eeprom_write()
240 			dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n",  in eeprom_write()
241 				(int)off, count);  in eeprom_write()
242 			return -EINVAL;  in eeprom_write()
249 				dev_err(&sl->dev, "bad CRC at offset %d\n",  in eeprom_write()
250 					(int)off);  in eeprom_write()
251 				return -EINVAL;  in eeprom_write()
256 	mutex_lock(&sl->master->mutex);  in eeprom_write()
261 		addr = off + idx;  in eeprom_write()
262 		len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK);  in eeprom_write()
263 		if (len > (count - idx))  in eeprom_write()
264 			len = count - idx;  in eeprom_write()
267 			count = -EIO;  in eeprom_write()
274 	mutex_unlock(&sl->master->mutex);  in eeprom_write()
282 			const struct bin_attribute *bin_attr, char *buf, loff_t off,  in pio_read()  argument
290 	if (off != 0 || count != 1 || buf == NULL)  in pio_read()
291 		return -EINVAL;  in pio_read()
293 	mutex_lock(&sl->master->mutex);  in pio_read()
295 	mutex_unlock(&sl->master->mutex);  in pio_read()
302 			 loff_t off, size_t count)  in pio_write()  argument
310 	if (off != 0 || count != 1 || buf == NULL)  in pio_write()
311 		return -EINVAL;  in pio_write()
313 	mutex_lock(&sl->master->mutex);  in pio_write()
317 		mutex_unlock(&sl->master->mutex);  in pio_write()
318 		return -1;  in pio_write()
327 	w1_write_block(sl->master, wrbuf, 3);  in pio_write()
329 	w1_read_block(sl->master, &ack, sizeof(ack));  in pio_write()
331 	mutex_unlock(&sl->master->mutex);  in pio_write()
335 		return -EIO;  in pio_write()
389 			return -ENOMEM;  in w1_f1C_add_slave()
390 		sl->family_data = data;  in w1_f1C_add_slave()
398 	kfree(sl->family_data);  in w1_f1C_remove_slave()
399 	sl->family_data = NULL;  in w1_f1C_remove_slave()
414 MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>");
417 MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS28E04));