1 // SPDX-License-Identifier: GPL-2.0-or-later
8  *	Oleh Kravchenko (Sparkfun Qwiic Joystick driver)
10  * Datasheet: https://cdn-learn.adafruit.com/downloads/pdf/gamepad-qt.pdf
15  *	- Add interrupt support
23 #include <linux/input/sparse-keymap.h>
27 #define SEESAW_DEVICE_NAME		"seesaw-gamepad"
92 			.addr = client->addr,  in seesaw_register_read()
93 			.flags = client->flags,  in seesaw_register_read()
98 			.addr = client->addr,  in seesaw_register_read()
99 			.flags = client->flags | I2C_M_RD,  in seesaw_register_read()
106 	ret = i2c_transfer(client->adapter, message_buf,  in seesaw_register_read()
156 	data->button_state = ~be32_to_cpu(read_buf);  in seesaw_read_data()
165 	 * ADC reads left as max and right as 0, must be reversed since kernel  in seesaw_read_data()
168 	data->x = SEESAW_JOYSTICK_MAX_AXIS - be16_to_cpu(adc_data);  in seesaw_read_data()
177 	data->y = be16_to_cpu(adc_data);  in seesaw_read_data()
186 	private->button_state = 0;  in seesaw_open()
198 	err = seesaw_read_data(private->i2c_client, &data);  in seesaw_poll()
200 		dev_err_ratelimited(&input->dev,  in seesaw_poll()
201 				    "failed to read joystick state: %d\n", err);  in seesaw_poll()
209 	changed = private->button_state ^ data.button_state;  in seesaw_poll()
210 	private->button_state = data.button_state;  in seesaw_poll()
216 			dev_err_ratelimited(&input->dev,  in seesaw_poll()
236 	seesaw = devm_kzalloc(&client->dev, sizeof(*seesaw), GFP_KERNEL);  in seesaw_probe()
238 		return -ENOMEM;  in seesaw_probe()
245 	dev_dbg(&client->dev, "Adafruit Seesaw Gamepad, Hardware ID: %02x\n",  in seesaw_probe()
248 	/* Set Pin Mode to input and enable pull-up resistors */  in seesaw_probe()
262 	seesaw->i2c_client = client;  in seesaw_probe()
263 	seesaw->input_dev = devm_input_allocate_device(&client->dev);  in seesaw_probe()
264 	if (!seesaw->input_dev)  in seesaw_probe()
265 		return -ENOMEM;  in seesaw_probe()
267 	seesaw->input_dev->id.bustype = BUS_I2C;  in seesaw_probe()
268 	seesaw->input_dev->name = "Adafruit Seesaw Gamepad";  in seesaw_probe()
269 	seesaw->input_dev->phys = "i2c/" SEESAW_DEVICE_NAME;  in seesaw_probe()
270 	seesaw->input_dev->open = seesaw_open;  in seesaw_probe()
271 	input_set_drvdata(seesaw->input_dev, seesaw);  in seesaw_probe()
272 	input_set_abs_params(seesaw->input_dev, ABS_X,  in seesaw_probe()
275 	input_set_abs_params(seesaw->input_dev, ABS_Y,  in seesaw_probe()
279 	err = sparse_keymap_setup(seesaw->input_dev, seesaw_buttons_new, NULL);  in seesaw_probe()
281 		dev_err(&client->dev,  in seesaw_probe()
286 	err = input_setup_polling(seesaw->input_dev, seesaw_poll);  in seesaw_probe()
288 		dev_err(&client->dev, "failed to set up polling: %d\n", err);  in seesaw_probe()
292 	input_set_poll_interval(seesaw->input_dev,  in seesaw_probe()
294 	input_set_max_poll_interval(seesaw->input_dev, SEESAW_GAMEPAD_POLL_MAX);  in seesaw_probe()
295 	input_set_min_poll_interval(seesaw->input_dev, SEESAW_GAMEPAD_POLL_MIN);  in seesaw_probe()
297 	err = input_register_device(seesaw->input_dev);  in seesaw_probe()
299 		dev_err(&client->dev, "failed to register joystick: %d\n", err);  in seesaw_probe()
313 	{ .compatible = "adafruit,seesaw-gamepad"},