1 // SPDX-License-Identifier: GPL-2.0-only
3  * Atmel Atmegaxx Capacitive Touch Button Driver
10  * on Atmega88PA part and uses QtouchADC parts for sensing touch.
19  * to poke at /dev/i2c-N devices.
86 	struct i2c_client *client = capdev->client;  in atmel_read()
87 	struct device *dev = &client->dev;  in atmel_read()
91 	if (len > sizeof(capdev->xfer_buf) - 2)  in atmel_read()
92 		return -EINVAL;  in atmel_read()
94 	capdev->xfer_buf[0] = reg;  in atmel_read()
95 	capdev->xfer_buf[1] = len;  in atmel_read()
97 	msg[0].addr = client->addr;  in atmel_read()
99 	msg[0].buf = capdev->xfer_buf;  in atmel_read()
102 	msg[1].addr = client->addr;  in atmel_read()
104 	msg[1].buf = capdev->xfer_buf;  in atmel_read()
107 	err = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));  in atmel_read()
109 		return err < 0 ? err : -EIO;  in atmel_read()
111 	if (capdev->xfer_buf[0] != reg) {  in atmel_read()
114 			capdev->xfer_buf[0], reg);  in atmel_read()
115 		return -ECOMM;  in atmel_read()
118 	memcpy(data, &capdev->xfer_buf[2], len);  in atmel_read()
125  * Multi-touch can be supported; however, it really depends on whether
126  * the device can multi-touch.
131 	struct device *dev = &capdev->client->dev;  in atmel_captouch_isr()
145 	changed_btn = new_btn ^ capdev->prev_btn;  in atmel_captouch_isr()
146 	capdev->prev_btn = new_btn;  in atmel_captouch_isr()
148 	for (i = 0; i < capdev->num_btn; i++) {  in atmel_captouch_isr()
150 			input_report_key(capdev->input,  in atmel_captouch_isr()
151 					 capdev->keycodes[i],  in atmel_captouch_isr()
155 	input_sync(capdev->input);  in atmel_captouch_isr()
167 	struct device *dev = &client->dev;  in atmel_captouch_probe()
172 	if (!i2c_check_functionality(client->adapter,  in atmel_captouch_probe()
177 		return -EINVAL;  in atmel_captouch_probe()
182 		return -ENOMEM;  in atmel_captouch_probe()
184 	capdev->client = client;  in atmel_captouch_probe()
187 			    &capdev->prev_btn, sizeof(capdev->prev_btn));  in atmel_captouch_probe()
193 	capdev->input = devm_input_allocate_device(dev);  in atmel_captouch_probe()
194 	if (!capdev->input) {  in atmel_captouch_probe()
196 		return -ENOMEM;  in atmel_captouch_probe()
199 	capdev->input->id.bustype = BUS_I2C;  in atmel_captouch_probe()
200 	capdev->input->id.product = 0x880A;  in atmel_captouch_probe()
201 	capdev->input->id.version = 0;  in atmel_captouch_probe()
202 	capdev->input->name = "ATMegaXX Capacitive Button Controller";  in atmel_captouch_probe()
203 	__set_bit(EV_KEY, capdev->input->evbit);  in atmel_captouch_probe()
205 	node = dev->of_node;  in atmel_captouch_probe()
208 		return -EINVAL;  in atmel_captouch_probe()
212 		__set_bit(EV_REP, capdev->input->evbit);  in atmel_captouch_probe()
214 	capdev->num_btn = of_property_count_u32_elems(node, "linux,keymap");  in atmel_captouch_probe()
215 	if (capdev->num_btn > MAX_NUM_OF_BUTTONS)  in atmel_captouch_probe()
216 		capdev->num_btn = MAX_NUM_OF_BUTTONS;  in atmel_captouch_probe()
219 					 capdev->keycodes,  in atmel_captouch_probe()
220 					 capdev->num_btn);  in atmel_captouch_probe()
227 	for (i = 0; i < capdev->num_btn; i++)  in atmel_captouch_probe()
228 		__set_bit(capdev->keycodes[i], capdev->input->keybit);  in atmel_captouch_probe()
230 	capdev->input->keycode = capdev->keycodes;  in atmel_captouch_probe()
231 	capdev->input->keycodesize = sizeof(capdev->keycodes[0]);  in atmel_captouch_probe()
232 	capdev->input->keycodemax = capdev->num_btn;  in atmel_captouch_probe()
234 	err = input_register_device(capdev->input);  in atmel_captouch_probe()
238 	err = devm_request_threaded_irq(dev, client->irq,  in atmel_captouch_probe()
244 			client->irq, err);  in atmel_captouch_probe()
276 MODULE_AUTHOR("Hung-yu Wu <hywu@google.com>");
277 MODULE_DESCRIPTION("Atmel ATmegaXX Capacitance Touch Sensor I2C Driver");