drivers/acpi/sbshc.c

88 static inline int smb_hc_read(struct acpi_smb_hc *hc, u8 address, u8 *data)
90 	return ec_read(hc->offset + address, data);
93 static inline int smb_hc_write(struct acpi_smb_hc *hc, u8 address, u8 data)
95 	return ec_write(hc->offset + address, data);
98 static int wait_transaction_complete(struct acpi_smb_hc *hc, int timeout)
100 	if (wait_event_timeout(hc->wait, hc->done, msecs_to_jiffies(timeout)))
105 static int acpi_smbus_transaction(struct acpi_smb_hc *hc, u8 protocol,
111 	if (!hc) {
116 	mutex_lock(&hc->lock);
117 	hc->done = false;
118 	if (smb_hc_read(hc, ACPI_SMB_PROTOCOL, &temp))
124 	smb_hc_write(hc, ACPI_SMB_COMMAND, command);
126 		smb_hc_write(hc, ACPI_SMB_BLOCK_COUNT, length);
128 			smb_hc_write(hc, ACPI_SMB_DATA + i, data[i]);
130 	smb_hc_write(hc, ACPI_SMB_ADDRESS, address << 1);
131 	smb_hc_write(hc, ACPI_SMB_PROTOCOL, protocol);
136 	ret = wait_transaction_complete(hc, 1000);
148 		if (smb_hc_read(hc, ACPI_SMB_BLOCK_COUNT, &sz)) {
156 		smb_hc_read(hc, ACPI_SMB_DATA + i, &data[i]);
158 	mutex_unlock(&hc->lock);
162 int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address,
165 	return acpi_smbus_transaction(hc, protocol, address, command, data, 0);
170 int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 address,
173 	return acpi_smbus_transaction(hc, protocol, address, command, data, length);
178 int acpi_smbus_register_callback(struct acpi_smb_hc *hc,
181 	mutex_lock(&hc->lock);
182 	hc->callback = callback;
183 	hc->context = context;
184 	mutex_unlock(&hc->lock);
190 int acpi_smbus_unregister_callback(struct acpi_smb_hc *hc)
192 	mutex_lock(&hc->lock);
193 	hc->callback = NULL;
194 	hc->context = NULL;
195 	mutex_unlock(&hc->lock);
204 	struct acpi_smb_hc *hc = context;
205 	if (hc->callback)
206 		hc->callback(hc->context);
211 	struct acpi_smb_hc *hc = context;
214 	if (smb_hc_read(hc, ACPI_SMB_STATUS, &status.raw))
218 		hc->done = true;
219 		wake_up(&hc->wait);
223 	mutex_lock(&hc->lock);
224 	smb_hc_read(hc, ACPI_SMB_ALARM_ADDRESS, &address);
226 	smb_hc_write(hc, ACPI_SMB_STATUS, status.raw);
233 					acpi_smbus_callback, hc);
235 	mutex_unlock(&hc->lock);
249 	struct acpi_smb_hc *hc;
263 	hc = kzalloc(sizeof(struct acpi_smb_hc), GFP_KERNEL);
264 	if (!hc)
266 	mutex_init(&hc->lock);
267 	init_waitqueue_head(&hc->wait);
269 	hc->ec = acpi_driver_data(acpi_dev_parent(device));
270 	hc->offset = (val >> 8) & 0xff;
271 	hc->query_bit = val & 0xff;
272 	device->driver_data = hc;
274 	acpi_ec_add_query_handler(hc->ec, hc->query_bit, NULL, smbus_alarm, hc);
276 		 hc->offset, hc->query_bit);
285 	struct acpi_smb_hc *hc;
290 	hc = acpi_driver_data(device);
291 	acpi_ec_remove_query_handler(hc->ec, hc->query_bit);
293 	kfree(hc);