1 // SPDX-License-Identifier: GPL-2.0
10 /* EETI eGalax serial touch screen controller is a I2C based multiple
14   - auto idle mode support
19 #include <linux/i2c.h>
65 static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)  in egalax_ts_interrupt()
68 	struct input_dev *input_dev = ts->input_dev;  in egalax_ts_interrupt()
69 	struct i2c_client *client = ts->client;  in egalax_ts_interrupt()
71 	int id, ret, x, y, z;  in egalax_ts_interrupt()
72 	int tries = 0;  in egalax_ts_interrupt()
78 	} while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES);  in egalax_ts_interrupt()
98 		dev_dbg(&client->dev, "point invalid\n");  in egalax_ts_interrupt()
105 	dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",  in egalax_ts_interrupt()
120 /* wake up controller by an falling edge of interrupt gpio.  */
121 static int egalax_wake_up_device(struct i2c_client *client)  in egalax_wake_up_device()
124 	int ret;  in egalax_wake_up_device()
126 	/* wake up controller via an falling edge on IRQ gpio. */  in egalax_wake_up_device()
127 	gpio = gpiod_get(&client->dev, "wakeup", GPIOD_OUT_HIGH);  in egalax_wake_up_device()
130 		if (ret != -EPROBE_DEFER)  in egalax_wake_up_device()
131 			dev_err(&client->dev,  in egalax_wake_up_device()
147 static int egalax_firmware_version(struct i2c_client *client)  in egalax_firmware_version()
150 	int ret;  in egalax_firmware_version()
159 static int egalax_ts_probe(struct i2c_client *client)  in egalax_ts_probe()
163 	int error;  in egalax_ts_probe()
165 	ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL);  in egalax_ts_probe()
167 		dev_err(&client->dev, "Failed to allocate memory\n");  in egalax_ts_probe()
168 		return -ENOMEM;  in egalax_ts_probe()
171 	input_dev = devm_input_allocate_device(&client->dev);  in egalax_ts_probe()
173 		dev_err(&client->dev, "Failed to allocate memory\n");  in egalax_ts_probe()
174 		return -ENOMEM;  in egalax_ts_probe()
177 	ts->client = client;  in egalax_ts_probe()
178 	ts->input_dev = input_dev;  in egalax_ts_probe()
187 		dev_err(&client->dev, "Failed to read firmware version\n");  in egalax_ts_probe()
191 	input_dev->name = "EETI eGalax Touch Screen";  in egalax_ts_probe()
192 	input_dev->id.bustype = BUS_I2C;  in egalax_ts_probe()
194 	__set_bit(EV_ABS, input_dev->evbit);  in egalax_ts_probe()
195 	__set_bit(EV_KEY, input_dev->evbit);  in egalax_ts_probe()
196 	__set_bit(BTN_TOUCH, input_dev->keybit);  in egalax_ts_probe()
206 	error = devm_request_threaded_irq(&client->dev, client->irq,  in egalax_ts_probe()
210 		dev_err(&client->dev, "Failed to register interrupt\n");  in egalax_ts_probe()
214 	error = input_register_device(ts->input_dev);  in egalax_ts_probe()
225 MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
227 static int egalax_ts_suspend(struct device *dev)  in egalax_ts_suspend()
233 	int ret;  in egalax_ts_suspend()
236 		return enable_irq_wake(client->irq);  in egalax_ts_suspend()
242 static int egalax_ts_resume(struct device *dev)  in egalax_ts_resume()
247 		return disable_irq_wake(client->irq);  in egalax_ts_resume()