1 // SPDX-License-Identifier: GPL-2.0
10 /* EETI eGalax serial touch screen controller is a I2C based multiple
14   - auto idle mode support
18 #include <linux/i2c.h>
64 static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)  in egalax_ts_interrupt()
67 	struct input_dev *input_dev = ts->input_dev;  in egalax_ts_interrupt()
68 	struct i2c_client *client = ts->client;  in egalax_ts_interrupt()
70 	int id, ret, x, y, z;  in egalax_ts_interrupt()
71 	int tries = 0;  in egalax_ts_interrupt()
77 	} while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES);  in egalax_ts_interrupt()
97 		dev_dbg(&client->dev, "point invalid\n");  in egalax_ts_interrupt()
104 	dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",  in egalax_ts_interrupt()
119 /* wake up controller by an falling edge of interrupt gpio.  */
120 static int egalax_wake_up_device(struct i2c_client *client)  in egalax_wake_up_device()
122 	struct device_node *np = client->dev.of_node;  in egalax_wake_up_device()
123 	int gpio;  in egalax_wake_up_device()
124 	int ret;  in egalax_wake_up_device()
127 		return -ENODEV;  in egalax_wake_up_device()
129 	gpio = of_get_named_gpio(np, "wakeup-gpios", 0);  in egalax_wake_up_device()
131 		return -ENODEV;  in egalax_wake_up_device()
135 		dev_err(&client->dev,  in egalax_wake_up_device()
141 	/* wake up controller via an falling edge on IRQ gpio. */  in egalax_wake_up_device()
152 static int egalax_firmware_version(struct i2c_client *client)  in egalax_firmware_version()
155 	int ret;  in egalax_firmware_version()
164 static int egalax_ts_probe(struct i2c_client *client,  in egalax_ts_probe()
169 	int error;  in egalax_ts_probe()
171 	ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL);  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 	input_dev = devm_input_allocate_device(&client->dev);  in egalax_ts_probe()
179 		dev_err(&client->dev, "Failed to allocate memory\n");  in egalax_ts_probe()
180 		return -ENOMEM;  in egalax_ts_probe()
183 	ts->client = client;  in egalax_ts_probe()
184 	ts->input_dev = input_dev;  in egalax_ts_probe()
189 		dev_err(&client->dev, "Failed to wake up the controller\n");  in egalax_ts_probe()
195 		dev_err(&client->dev, "Failed to read firmware version\n");  in egalax_ts_probe()
199 	input_dev->name = "EETI eGalax Touch Screen";  in egalax_ts_probe()
200 	input_dev->id.bustype = BUS_I2C;  in egalax_ts_probe()
202 	__set_bit(EV_ABS, input_dev->evbit);  in egalax_ts_probe()
203 	__set_bit(EV_KEY, input_dev->evbit);  in egalax_ts_probe()
204 	__set_bit(BTN_TOUCH, input_dev->keybit);  in egalax_ts_probe()
214 	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,  in egalax_ts_probe()
219 		dev_err(&client->dev, "Failed to register interrupt\n");  in egalax_ts_probe()
223 	error = input_register_device(ts->input_dev);  in egalax_ts_probe()
234 MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
236 static int __maybe_unused egalax_ts_suspend(struct device *dev)  in egalax_ts_suspend()
242 	int ret;  in egalax_ts_suspend()
245 		return enable_irq_wake(client->irq);  in egalax_ts_suspend()
251 static int __maybe_unused egalax_ts_resume(struct device *dev)  in egalax_ts_resume()
256 		return disable_irq_wake(client->irq);  in egalax_ts_resume()