drivers/i2c/i2c-slave-eeprom.c

48 	struct eeprom_data *eeprom = i2c_get_clientdata(client);
52 		if (eeprom->idx_write_cnt < eeprom->num_address_bytes) {
53 			if (eeprom->idx_write_cnt == 0)
54 				eeprom->buffer_idx = 0;
55 			eeprom->buffer_idx = *val | (eeprom->buffer_idx << 8);
56 			eeprom->idx_write_cnt++;
58 			if (!eeprom->read_only) {
59 				spin_lock(&eeprom->buffer_lock);
60 				eeprom->buffer[eeprom->buffer_idx++ & eeprom->address_mask] = *val;
61 				spin_unlock(&eeprom->buffer_lock);
68 		eeprom->buffer_idx++;
71 		spin_lock(&eeprom->buffer_lock);
72 		*val = eeprom->buffer[eeprom->buffer_idx & eeprom->address_mask];
73 		spin_unlock(&eeprom->buffer_lock);
83 		eeprom->idx_write_cnt = 0;
96 	struct eeprom_data *eeprom;
99 	eeprom = dev_get_drvdata(kobj_to_dev(kobj));
101 	spin_lock_irqsave(&eeprom->buffer_lock, flags);
102 	memcpy(buf, &eeprom->buffer[off], count);
103 	spin_unlock_irqrestore(&eeprom->buffer_lock, flags);
111 	struct eeprom_data *eeprom;
114 	eeprom = dev_get_drvdata(kobj_to_dev(kobj));
116 	spin_lock_irqsave(&eeprom->buffer_lock, flags);
117 	memcpy(&eeprom->buffer[off], buf, count);
118 	spin_unlock_irqrestore(&eeprom->buffer_lock, flags);
123 static int i2c_slave_init_eeprom_data(struct eeprom_data *eeprom, struct i2c_client *client,
132 						eeprom->buffer, size);
137 		/* An empty eeprom typically has all bits set to 1 */
138 		memset(eeprom->buffer, 0xff, size);
146 	struct eeprom_data *eeprom;
151 	eeprom = devm_kzalloc(&client->dev, sizeof(struct eeprom_data) + size, GFP_KERNEL);
152 	if (!eeprom)
155 	eeprom->num_address_bytes = flag_addr16 ? 2 : 1;
156 	eeprom->address_mask = size - 1;
157 	eeprom->read_only = FIELD_GET(I2C_SLAVE_FLAG_RO, id->driver_data);
158 	spin_lock_init(&eeprom->buffer_lock);
159 	i2c_set_clientdata(client, eeprom);
161 	ret = i2c_slave_init_eeprom_data(eeprom, client, size);
165 	sysfs_bin_attr_init(&eeprom->bin);
166 	eeprom->bin.attr.name = "slave-eeprom";
167 	eeprom->bin.attr.mode = S_IRUSR | S_IWUSR;
168 	eeprom->bin.read = i2c_slave_eeprom_bin_read;
169 	eeprom->bin.write = i2c_slave_eeprom_bin_write;
170 	eeprom->bin.size = size;
172 	ret = sysfs_create_bin_file(&client->dev.kobj, &eeprom->bin);
178 		sysfs_remove_bin_file(&client->dev.kobj, &eeprom->bin);
187 	struct eeprom_data *eeprom = i2c_get_clientdata(client);
190 	sysfs_remove_bin_file(&client->dev.kobj, &eeprom->bin);
208 		.name = "i2c-slave-eeprom",