1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2011-2016 Synaptics Incorporated
17  * struct rmi_i2c_xport - stores information for i2c communication
25  * @tx_buf: Buffer used for transmitting data to the sensor over i2c.
49  * rmi_set_page - Set RMI page
53  * RMI devices have 16-bit addressing, but some of the transport
54  * implementations (like SMBus) only have 8-bit addressing. So RMI implements
60  * Returns zero on success, non-zero on failure.
64 	struct i2c_client *client = rmi_i2c->client;  in rmi_set_page()
70 		dev_err(&client->dev,  in rmi_set_page()
72 		return (retval < 0) ? retval : -EIO;  in rmi_set_page()
75 	rmi_i2c->page = page;  in rmi_set_page()
84 	struct i2c_client *client = rmi_i2c->client;  in rmi_i2c_write_block()
88 	mutex_lock(&rmi_i2c->page_mutex);  in rmi_i2c_write_block()
90 	if (!rmi_i2c->tx_buf || rmi_i2c->tx_buf_size < tx_size) {  in rmi_i2c_write_block()
91 		if (rmi_i2c->tx_buf)  in rmi_i2c_write_block()
92 			devm_kfree(&client->dev, rmi_i2c->tx_buf);  in rmi_i2c_write_block()
93 		rmi_i2c->tx_buf_size = tx_size + BUFFER_SIZE_INCREMENT;  in rmi_i2c_write_block()
94 		rmi_i2c->tx_buf = devm_kzalloc(&client->dev,  in rmi_i2c_write_block()
95 					       rmi_i2c->tx_buf_size,  in rmi_i2c_write_block()
97 		if (!rmi_i2c->tx_buf) {  in rmi_i2c_write_block()
98 			rmi_i2c->tx_buf_size = 0;  in rmi_i2c_write_block()
99 			retval = -ENOMEM;  in rmi_i2c_write_block()
104 	rmi_i2c->tx_buf[0] = addr & 0xff;  in rmi_i2c_write_block()
105 	memcpy(rmi_i2c->tx_buf + 1, buf, len);  in rmi_i2c_write_block()
107 	if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {  in rmi_i2c_write_block()
113 	retval = i2c_master_send(client, rmi_i2c->tx_buf, tx_size);  in rmi_i2c_write_block()
117 		retval = -EIO;  in rmi_i2c_write_block()
120 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,  in rmi_i2c_write_block()
124 	mutex_unlock(&rmi_i2c->page_mutex);  in rmi_i2c_write_block()
133 	struct i2c_client *client = rmi_i2c->client;  in rmi_i2c_read_block()
138 			.addr	= client->addr,  in rmi_i2c_read_block()
143 			.addr	= client->addr,  in rmi_i2c_read_block()
150 	mutex_lock(&rmi_i2c->page_mutex);  in rmi_i2c_read_block()
152 	if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {  in rmi_i2c_read_block()
158 	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));  in rmi_i2c_read_block()
162 		retval = -EIO;  in rmi_i2c_read_block()
165 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,  in rmi_i2c_read_block()
169 	mutex_unlock(&rmi_i2c->page_mutex);  in rmi_i2c_read_block()
180 	{ .compatible = "syna,rmi4-i2c" },
190 	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_regulator_bulk_disable()
191 			       rmi_i2c->supplies);  in rmi_i2c_regulator_bulk_disable()
198 	rmi_unregister_transport_device(&rmi_i2c->xport);  in rmi_i2c_unregister_transport()
206 					dev_get_platdata(&client->dev);  in rmi_i2c_probe()
210 	rmi_i2c = devm_kzalloc(&client->dev, sizeof(struct rmi_i2c_xport),  in rmi_i2c_probe()
213 		return -ENOMEM;  in rmi_i2c_probe()
215 	pdata = &rmi_i2c->xport.pdata;  in rmi_i2c_probe()
217 	if (!client->dev.of_node && client_pdata)  in rmi_i2c_probe()
220 	pdata->irq = client->irq;  in rmi_i2c_probe()
222 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n",  in rmi_i2c_probe()
223 			dev_name(&client->dev));  in rmi_i2c_probe()
225 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in rmi_i2c_probe()
226 		dev_err(&client->dev,  in rmi_i2c_probe()
228 		return -ENODEV;  in rmi_i2c_probe()
231 	rmi_i2c->supplies[0].supply = "vdd";  in rmi_i2c_probe()
232 	rmi_i2c->supplies[1].supply = "vio";  in rmi_i2c_probe()
233 	error = devm_regulator_bulk_get(&client->dev,  in rmi_i2c_probe()
234 					 ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_probe()
235 					 rmi_i2c->supplies);  in rmi_i2c_probe()
239 	error = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_probe()
240 				       rmi_i2c->supplies);  in rmi_i2c_probe()
244 	error = devm_add_action_or_reset(&client->dev,  in rmi_i2c_probe()
250 	of_property_read_u32(client->dev.of_node, "syna,startup-delay-ms",  in rmi_i2c_probe()
251 			     &rmi_i2c->startup_delay);  in rmi_i2c_probe()
253 	msleep(rmi_i2c->startup_delay);  in rmi_i2c_probe()
255 	rmi_i2c->client = client;  in rmi_i2c_probe()
256 	mutex_init(&rmi_i2c->page_mutex);  in rmi_i2c_probe()
258 	rmi_i2c->xport.dev = &client->dev;  in rmi_i2c_probe()
259 	rmi_i2c->xport.proto_name = "i2c";  in rmi_i2c_probe()
260 	rmi_i2c->xport.ops = &rmi_i2c_ops;  in rmi_i2c_probe()
270 		dev_err(&client->dev, "Failed to set page select to 0\n");  in rmi_i2c_probe()
274 	dev_info(&client->dev, "registering I2C-connected sensor\n");  in rmi_i2c_probe()
276 	error = rmi_register_transport_device(&rmi_i2c->xport);  in rmi_i2c_probe()
278 		dev_err(&client->dev, "failed to register sensor: %d\n", error);  in rmi_i2c_probe()
282 	error = devm_add_action_or_reset(&client->dev,  in rmi_i2c_probe()
298 	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev, true);  in rmi_i2c_suspend()
302 	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_suspend()
303 			       rmi_i2c->supplies);  in rmi_i2c_suspend()
314 	ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_resume()
315 				    rmi_i2c->supplies);  in rmi_i2c_resume()
319 	msleep(rmi_i2c->startup_delay);  in rmi_i2c_resume()
321 	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev, true);  in rmi_i2c_resume()
336 	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev, false);  in rmi_i2c_runtime_suspend()
340 	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_runtime_suspend()
341 			       rmi_i2c->supplies);  in rmi_i2c_runtime_suspend()
352 	ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),  in rmi_i2c_runtime_resume()
353 				    rmi_i2c->supplies);  in rmi_i2c_runtime_resume()
357 	msleep(rmi_i2c->startup_delay);  in rmi_i2c_runtime_resume()
359 	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev, false);  in rmi_i2c_runtime_resume()