249 static struct at24_client *at24_translate_offset(struct at24_data *at24,  in at24_translate_offset()  argument
254 	if (at24->flags & AT24_FLAG_ADDR16) {  in at24_translate_offset()
262 	return &at24->client[i];  in at24_translate_offset()
265 static struct device *at24_base_client_dev(struct at24_data *at24)  in at24_base_client_dev()  argument
267 	return &at24->client[0].client->dev;  in at24_base_client_dev()
270 static size_t at24_adjust_read_count(struct at24_data *at24,  in at24_adjust_read_count()  argument
281 	if (at24->flags & AT24_FLAG_NO_RDROL) {  in at24_adjust_read_count()
282 		bits = (at24->flags & AT24_FLAG_ADDR16) ? 16 : 8;  in at24_adjust_read_count()
294 static ssize_t at24_regmap_read(struct at24_data *at24, char *buf,  in at24_regmap_read()  argument
303 	at24_client = at24_translate_offset(at24, &offset);  in at24_regmap_read()
306 	count = at24_adjust_read_count(at24, offset, count);  in at24_regmap_read()
309 	offset += at24->offset_adj;  in at24_regmap_read()
331 static size_t at24_adjust_write_count(struct at24_data *at24,  in at24_adjust_write_count()  argument
337 	if (count > at24->write_max)  in at24_adjust_write_count()
338 		count = at24->write_max;  in at24_adjust_write_count()
341 	next_page = roundup(offset + 1, at24->page_size);  in at24_adjust_write_count()
348 static ssize_t at24_regmap_write(struct at24_data *at24, const char *buf,  in at24_regmap_write()  argument
357 	at24_client = at24_translate_offset(at24, &offset);  in at24_regmap_write()
360 	count = at24_adjust_write_count(at24, offset, count);  in at24_regmap_write()
375 	struct at24_data *at24;  in at24_read()  local
380 	at24 = priv;  in at24_read()
381 	dev = at24_base_client_dev(at24);  in at24_read()
386 	if (off + count > at24->byte_len)  in at24_read()
399 	mutex_lock(&at24->lock);  in at24_read()
402 		ret = at24_regmap_read(at24, buf, off, count);  in at24_read()
404 			mutex_unlock(&at24->lock);  in at24_read()
413 	mutex_unlock(&at24->lock);  in at24_read()
422 	struct at24_data *at24;  in at24_write()  local
427 	at24 = priv;  in at24_write()
428 	dev = at24_base_client_dev(at24);  in at24_write()
433 	if (off + count > at24->byte_len)  in at24_write()
446 	mutex_lock(&at24->lock);  in at24_write()
447 	gpiod_set_value_cansleep(at24->wp_gpio, 0);  in at24_write()
450 		ret = at24_regmap_write(at24, buf, off, count);  in at24_write()
452 			gpiod_set_value_cansleep(at24->wp_gpio, 1);  in at24_write()
453 			mutex_unlock(&at24->lock);  in at24_write()
462 	gpiod_set_value_cansleep(at24->wp_gpio, 1);  in at24_write()
463 	mutex_unlock(&at24->lock);  in at24_write()
552 static void at24_remove_dummy_clients(struct at24_data *at24)  in at24_remove_dummy_clients()  argument
556 	for (i = 1; i < at24->num_addresses; i++)  in at24_remove_dummy_clients()
557 		i2c_unregister_device(at24->client[i].client);  in at24_remove_dummy_clients()
560 static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,  in at24_make_dummy_client()  argument
568 	base_client = at24->client[0].client;  in at24_make_dummy_client()
585 	at24->client[index].client = dummy_client;  in at24_make_dummy_client()
586 	at24->client[index].regmap = regmap;  in at24_make_dummy_client()
622 	struct at24_data *at24;  in at24_probe()  local
668 	at24_size = sizeof(*at24) + num_addresses * sizeof(struct at24_client);  in at24_probe()
669 	at24 = devm_kzalloc(dev, at24_size, GFP_KERNEL);  in at24_probe()
670 	if (!at24)  in at24_probe()
673 	mutex_init(&at24->lock);  in at24_probe()
674 	at24->byte_len = pdata.byte_len;  in at24_probe()
675 	at24->page_size = pdata.page_size;  in at24_probe()
676 	at24->flags = pdata.flags;  in at24_probe()
677 	at24->num_addresses = num_addresses;  in at24_probe()
678 	at24->offset_adj = at24_get_offset_adj(pdata.flags, pdata.byte_len);  in at24_probe()
679 	at24->client[0].client = client;  in at24_probe()
680 	at24->client[0].regmap = regmap;  in at24_probe()
682 	at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);  in at24_probe()
683 	if (IS_ERR(at24->wp_gpio))  in at24_probe()
684 		return PTR_ERR(at24->wp_gpio);  in at24_probe()
688 		at24->write_max = min_t(unsigned int,  in at24_probe()
690 		if (!i2c_fn_i2c && at24->write_max > I2C_SMBUS_BLOCK_MAX)  in at24_probe()
691 			at24->write_max = I2C_SMBUS_BLOCK_MAX;  in at24_probe()
696 		err = at24_make_dummy_client(at24, i, &regmap_config);  in at24_probe()
698 			at24_remove_dummy_clients(at24);  in at24_probe()
703 	i2c_set_clientdata(client, at24);  in at24_probe()
713 	err = at24_read(at24, 0, &test_byte, 1);  in at24_probe()
729 	nvmem_config.priv = at24;  in at24_probe()
734 	at24->nvmem = devm_nvmem_register(dev, &nvmem_config);  in at24_probe()
735 	if (IS_ERR(at24->nvmem)) {  in at24_probe()
736 		err = PTR_ERR(at24->nvmem);  in at24_probe()
742 		 writable ? "writable" : "read-only", at24->write_max);  in at24_probe()
746 		pdata.setup(at24->nvmem, pdata.context);  in at24_probe()
751 	at24_remove_dummy_clients(at24);  in at24_probe()
759 	struct at24_data *at24;  in at24_remove()  local
761 	at24 = i2c_get_clientdata(client);  in at24_remove()
763 	at24_remove_dummy_clients(at24);  in at24_remove()