1 // SPDX-License-Identifier: GPL-2.0-only
81 	ACPI_SMB_ADDRESS = 2,	/* address */
83 	ACPI_SMB_DATA = 4,	/* 32 data registers */
84 	ACPI_SMB_BLOCK_COUNT = 0x24,	/* number of data bytes */
85 	ACPI_SMB_ALARM_ADDRESS = 0x25,	/* alarm address */
86 	ACPI_SMB_ALARM_DATA = 0x26,	/* 2 bytes alarm data */
89 static inline int smb_hc_read(struct acpi_smb_hc *hc, u8 address, u8 *data)  in smb_hc_read()  argument
91 	return ec_read(hc->offset + address, data);  in smb_hc_read()
94 static inline int smb_hc_write(struct acpi_smb_hc *hc, u8 address, u8 data)  in smb_hc_write()  argument
96 	return ec_write(hc->offset + address, data);  in smb_hc_write()
101 	if (wait_event_timeout(hc->wait, hc->done, msecs_to_jiffies(timeout)))  in wait_transaction_complete()
103 	return -ETIME;  in wait_transaction_complete()
107 				  u8 address, u8 command, u8 *data, u8 length)  in acpi_smbus_transaction()  argument
109 	int ret = -EFAULT, i;  in acpi_smbus_transaction()
117 	mutex_lock(&hc->lock);  in acpi_smbus_transaction()
118 	hc->done = false;  in acpi_smbus_transaction()
122 		ret = -EBUSY;  in acpi_smbus_transaction()
129 			smb_hc_write(hc, ACPI_SMB_DATA + i, data[i]);  in acpi_smbus_transaction()
131 	smb_hc_write(hc, ACPI_SMB_ADDRESS, address << 1);  in acpi_smbus_transaction()
134 	 * Wait for completion. Save the status code, data size,  in acpi_smbus_transaction()
135 	 * and data into the return package (if required by the protocol).  in acpi_smbus_transaction()
150 			ret = -EFAULT;  in acpi_smbus_transaction()
157 		smb_hc_read(hc, ACPI_SMB_DATA + i, &data[i]);  in acpi_smbus_transaction()
159 	mutex_unlock(&hc->lock);  in acpi_smbus_transaction()
163 int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,  in acpi_smbus_read()  argument
164 		    u8 command, u8 *data)  in acpi_smbus_read()  argument
166 	return acpi_smbus_transaction(hc, protocol, address, command, data, 0);  in acpi_smbus_read()
171 int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 address,  in acpi_smbus_write()  argument
172 		     u8 command, u8 *data, u8 length)  in acpi_smbus_write()  argument
174 	return acpi_smbus_transaction(hc, protocol, address, command, data, length);  in acpi_smbus_write()
182 	mutex_lock(&hc->lock);  in acpi_smbus_register_callback()
183 	hc->callback = callback;  in acpi_smbus_register_callback()
184 	hc->context = context;  in acpi_smbus_register_callback()
185 	mutex_unlock(&hc->lock);  in acpi_smbus_register_callback()
193 	mutex_lock(&hc->lock);  in acpi_smbus_unregister_callback()
194 	hc->callback = NULL;  in acpi_smbus_unregister_callback()
195 	hc->context = NULL;  in acpi_smbus_unregister_callback()
196 	mutex_unlock(&hc->lock);  in acpi_smbus_unregister_callback()
206 	if (hc->callback)  in acpi_smbus_callback()
207 		hc->callback(hc->context);  in acpi_smbus_callback()
214 	u8 address;  in smbus_alarm()  local
219 		hc->done = true;  in smbus_alarm()
220 		wake_up(&hc->wait);  in smbus_alarm()
224 	mutex_lock(&hc->lock);  in smbus_alarm()
225 	smb_hc_read(hc, ACPI_SMB_ALARM_ADDRESS, &address);  in smbus_alarm()
229 	switch (address >> 1) {  in smbus_alarm()
236 	mutex_unlock(&hc->lock);  in smbus_alarm()
247 		return -EINVAL;  in acpi_smbus_hc_add()
249 	status = acpi_evaluate_integer(device->handle, "_EC", NULL, &val);  in acpi_smbus_hc_add()
252 		return -EIO;  in acpi_smbus_hc_add()
260 		return -ENOMEM;  in acpi_smbus_hc_add()
261 	mutex_init(&hc->lock);  in acpi_smbus_hc_add()
262 	init_waitqueue_head(&hc->wait);  in acpi_smbus_hc_add()
264 	hc->ec = acpi_driver_data(acpi_dev_parent(device));  in acpi_smbus_hc_add()
265 	hc->offset = (val >> 8) & 0xff;  in acpi_smbus_hc_add()
266 	hc->query_bit = val & 0xff;  in acpi_smbus_hc_add()
267 	device->driver_data = hc;  in acpi_smbus_hc_add()
269 	acpi_ec_add_query_handler(hc->ec, hc->query_bit, NULL, smbus_alarm, hc);  in acpi_smbus_hc_add()
270 	dev_info(&device->dev, "SBS HC: offset = 0x%0x, query_bit = 0x%0x\n",  in acpi_smbus_hc_add()
271 		 hc->offset, hc->query_bit);  in acpi_smbus_hc_add()
284 	acpi_ec_remove_query_handler(hc->ec, hc->query_bit);  in acpi_smbus_hc_remove()
287 	device->driver_data = NULL;  in acpi_smbus_hc_remove()