1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for keys on TCA6416 I2C IO expander
29 	{ "tca6416-keys", 16, },
30 	{ "tca6408-keys", 8, },
52 	error = chip->io_size > 8 ?  in tca6416_write_reg()
53 		i2c_smbus_write_word_data(chip->client, reg << 1, val) :  in tca6416_write_reg()
54 		i2c_smbus_write_byte_data(chip->client, reg, val);  in tca6416_write_reg()
56 		dev_err(&chip->client->dev,  in tca6416_write_reg()
69 	retval = chip->io_size > 8 ?  in tca6416_read_reg()
70 		 i2c_smbus_read_word_data(chip->client, reg << 1) :  in tca6416_read_reg()
71 		 i2c_smbus_read_byte_data(chip->client, reg);  in tca6416_read_reg()
73 		dev_err(&chip->client->dev, "%s failed, reg: %d, error: %d\n",  in tca6416_read_reg()
92 	reg_val &= chip->pinmask;  in tca6416_keys_scan()
95 	val = reg_val ^ chip->reg_input;  in tca6416_keys_scan()
96 	chip->reg_input = reg_val;  in tca6416_keys_scan()
100 			struct tca6416_button *button = &chip->buttons[pin_index];  in tca6416_keys_scan()
101 			unsigned int type = button->type ?: EV_KEY;  in tca6416_keys_scan()
103 						^ button->active_low;  in tca6416_keys_scan()
105 			input_event(input, type, button->code, !!state);  in tca6416_keys_scan()
109 		if (chip->pinmask & (1 << i))  in tca6416_keys_scan()
128 	if (!chip->use_polling) {  in tca6416_keys_open()
131 		enable_irq(chip->client->irq);  in tca6416_keys_open()
141 	if (!chip->use_polling)  in tca6416_keys_close()
142 		disable_irq(chip->client->irq);  in tca6416_keys_close()
149 	error = tca6416_read_reg(chip, TCA6416_OUTPUT, &chip->reg_output);  in tca6416_setup_registers()
153 	error = tca6416_read_reg(chip, TCA6416_DIRECTION, &chip->reg_direction);  in tca6416_setup_registers()
159 				  chip->reg_direction | chip->pinmask);  in tca6416_setup_registers()
163 	error = tca6416_read_reg(chip, TCA6416_DIRECTION, &chip->reg_direction);  in tca6416_setup_registers()
167 	error = tca6416_read_reg(chip, TCA6416_INPUT, &chip->reg_input);  in tca6416_setup_registers()
171 	chip->reg_input &= chip->pinmask;  in tca6416_setup_registers()
186 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {  in tca6416_keypad_probe()
187 		dev_err(&client->dev, "%s adapter not supported\n",  in tca6416_keypad_probe()
188 			dev_driver_string(&client->adapter->dev));  in tca6416_keypad_probe()
189 		return -ENODEV;  in tca6416_keypad_probe()
192 	pdata = dev_get_platdata(&client->dev);  in tca6416_keypad_probe()
194 		dev_dbg(&client->dev, "no platform data\n");  in tca6416_keypad_probe()
195 		return -EINVAL;  in tca6416_keypad_probe()
198 	chip = devm_kzalloc(&client->dev,  in tca6416_keypad_probe()
199 			    struct_size(chip, buttons, pdata->nbuttons),  in tca6416_keypad_probe()
202 		return -ENOMEM;  in tca6416_keypad_probe()
204 	input = devm_input_allocate_device(&client->dev);  in tca6416_keypad_probe()
206 		return -ENOMEM;  in tca6416_keypad_probe()
208 	chip->client = client;  in tca6416_keypad_probe()
209 	chip->input = input;  in tca6416_keypad_probe()
210 	chip->io_size = id->driver_data;  in tca6416_keypad_probe()
211 	chip->pinmask = pdata->pinmask;  in tca6416_keypad_probe()
212 	chip->use_polling = pdata->use_polling;  in tca6416_keypad_probe()
214 	input->phys = "tca6416-keys/input0";  in tca6416_keypad_probe()
215 	input->name = client->name;  in tca6416_keypad_probe()
217 	input->open = tca6416_keys_open;  in tca6416_keypad_probe()
218 	input->close = tca6416_keys_close;  in tca6416_keypad_probe()
220 	input->id.bustype = BUS_HOST;  in tca6416_keypad_probe()
221 	input->id.vendor = 0x0001;  in tca6416_keypad_probe()
222 	input->id.product = 0x0001;  in tca6416_keypad_probe()
223 	input->id.version = 0x0100;  in tca6416_keypad_probe()
226 	if (pdata->rep)  in tca6416_keypad_probe()
227 		__set_bit(EV_REP, input->evbit);  in tca6416_keypad_probe()
229 	for (i = 0; i < pdata->nbuttons; i++) {  in tca6416_keypad_probe()
232 		chip->buttons[i] = pdata->buttons[i];  in tca6416_keypad_probe()
233 		type = (pdata->buttons[i].type) ?: EV_KEY;  in tca6416_keypad_probe()
234 		input_set_capability(input, type, pdata->buttons[i].code);  in tca6416_keypad_probe()
247 	if (chip->use_polling) {  in tca6416_keypad_probe()
250 			dev_err(&client->dev, "Failed to setup polling\n");  in tca6416_keypad_probe()
256 		error = devm_request_threaded_irq(&client->dev, client->irq,  in tca6416_keypad_probe()
261 						  "tca6416-keypad", input);  in tca6416_keypad_probe()
263 			dev_dbg(&client->dev,  in tca6416_keypad_probe()
265 				client->irq, error);  in tca6416_keypad_probe()
272 		dev_dbg(&client->dev,  in tca6416_keypad_probe()
284 		.name	= "tca6416-keypad",
304 MODULE_DESCRIPTION("Keypad driver over tca6416 IO expander");