1 // SPDX-License-Identifier: GPL-2.0-only
3  * Touchkey driver for Freescale MPR121 Controllor
54 /* MPR121 has 12 keys */
123 	struct mpr121_touchkey *mpr121 = input_get_drvdata(dev);  in mpr_touchkey_report()  local
124 	struct input_dev *input = mpr121->input_dev;  in mpr_touchkey_report()
125 	struct i2c_client *client = mpr121->client;  in mpr_touchkey_report()
132 		dev_err(&client->dev, "i2c read error [%d]\n", reg);  in mpr_touchkey_report()
139 		dev_err(&client->dev, "i2c read error [%d]\n", reg);  in mpr_touchkey_report()
145 	bit_changed = reg ^ mpr121->statusbits;  in mpr_touchkey_report()
146 	mpr121->statusbits = reg;  in mpr_touchkey_report()
147 	for_each_set_bit(key_num, &bit_changed, mpr121->keycount) {  in mpr_touchkey_report()
151 		key_val = mpr121->keycodes[key_num];  in mpr_touchkey_report()
156 		dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val,  in mpr_touchkey_report()
165 	struct mpr121_touchkey *mpr121 = dev_id;  in mpr_touchkey_interrupt()  local
167 	mpr_touchkey_report(mpr121->input_dev);  in mpr_touchkey_interrupt()
172 static int mpr121_phys_init(struct mpr121_touchkey *mpr121,  in mpr121_phys_init()  argument
179 	/* Set up touch/release threshold for ele0-ele11 */  in mpr121_phys_init()
194 		ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val);  in mpr121_phys_init()
202 	 * The internal MPR121-auto-configuration can do this if it's  in mpr121_phys_init()
206 	usl = ((vdd - 700) * 256) / vdd;  in mpr121_phys_init()
218 	eleconf = mpr121->keycount | ELECTRODE_CONF_QUICK_CHARGE;  in mpr121_phys_init()
224 	dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount);  in mpr121_phys_init()
229 	dev_err(&client->dev, "i2c write error: %d\n", ret);  in mpr121_phys_init()
236 	struct device *dev = &client->dev;  in mpr_touchkey_probe()
239 	struct mpr121_touchkey *mpr121;  in mpr_touchkey_probe()  local
251 	mpr121 = devm_kzalloc(dev, sizeof(*mpr121), GFP_KERNEL);  in mpr_touchkey_probe()
252 	if (!mpr121)  in mpr_touchkey_probe()
253 		return -ENOMEM;  in mpr_touchkey_probe()
257 		return -ENOMEM;  in mpr_touchkey_probe()
259 	mpr121->client = client;  in mpr_touchkey_probe()
260 	mpr121->input_dev = input_dev;  in mpr_touchkey_probe()
261 	mpr121->keycount = device_property_count_u32(dev, "linux,keycodes");  in mpr_touchkey_probe()
262 	if (mpr121->keycount > MPR121_MAX_KEY_COUNT) {  in mpr_touchkey_probe()
263 		dev_err(dev, "too many keys defined (%d)\n", mpr121->keycount);  in mpr_touchkey_probe()
264 		return -EINVAL;  in mpr_touchkey_probe()
268 					       mpr121->keycodes,  in mpr_touchkey_probe()
269 					       mpr121->keycount);  in mpr_touchkey_probe()
276 	input_dev->name = "Freescale MPR121 Touchkey";  in mpr_touchkey_probe()
277 	input_dev->id.bustype = BUS_I2C;  in mpr_touchkey_probe()
278 	input_dev->dev.parent = dev;  in mpr_touchkey_probe()
280 		__set_bit(EV_REP, input_dev->evbit);  in mpr_touchkey_probe()
282 	input_set_drvdata(input_dev, mpr121);  in mpr_touchkey_probe()
284 	input_dev->keycode = mpr121->keycodes;  in mpr_touchkey_probe()
285 	input_dev->keycodesize = sizeof(mpr121->keycodes[0]);  in mpr_touchkey_probe()
286 	input_dev->keycodemax = mpr121->keycount;  in mpr_touchkey_probe()
288 	for (i = 0; i < mpr121->keycount; i++)  in mpr_touchkey_probe()
289 		input_set_capability(input_dev, EV_KEY, mpr121->keycodes[i]);  in mpr_touchkey_probe()
291 	error = mpr121_phys_init(mpr121, client, vdd_uv);  in mpr_touchkey_probe()
297 	device_property_read_u32(dev, "poll-interval", &poll_interval);  in mpr_touchkey_probe()
299 	if (client->irq) {  in mpr_touchkey_probe()
300 		error = devm_request_threaded_irq(dev, client->irq, NULL,  in mpr_touchkey_probe()
304 						  dev->driver->name, mpr121);  in mpr_touchkey_probe()
311 			return -EINVAL;  in mpr_touchkey_probe()
314 			return -EINVAL;  in mpr_touchkey_probe()
330 		return -EINVAL;  in mpr_touchkey_probe()
337 	i2c_set_clientdata(client, mpr121);  in mpr_touchkey_probe()
339 			device_property_read_bool(dev, "wakeup-source"));  in mpr_touchkey_probe()
348 	if (device_may_wakeup(&client->dev))  in mpr_suspend()
349 		enable_irq_wake(client->irq);  in mpr_suspend()
359 	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);  in mpr_resume()  local
361 	if (device_may_wakeup(&client->dev))  in mpr_resume()
362 		disable_irq_wake(client->irq);  in mpr_resume()
365 				  mpr121->keycount);  in mpr_resume()
380 	{ .compatible = "fsl,mpr121-touchkey" },
388 		.name	= "mpr121",
400 MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip");