1 // SPDX-License-Identifier: GPL-2.0
9  *  - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
25 #include <linux/input/touch-overlay.h>
27 #define ST1232_TS_NAME	"st1232-ts"
28 #define ST1633_TS_NAME	"st1633-ts"
69 	struct i2c_client *client = ts->client;  in st1232_ts_read_data()
72 			.addr	= client->addr,  in st1232_ts_read_data()
77 			.addr	= client->addr,  in st1232_ts_read_data()
80 			.buf	= ts->read_buf,  in st1232_ts_read_data()
85 	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));  in st1232_ts_read_data()
87 		return ret < 0 ? ret : -EIO;  in st1232_ts_read_data()
97 	for (retries = 100; retries; retries--) {  in st1232_ts_wait_ready()
100 			switch (ts->read_buf[0]) {  in st1232_ts_wait_ready()
110 	return -ENXIO;  in st1232_ts_wait_ready()
124 	buf = ts->read_buf;  in st1232_ts_read_resolution()
126 	*max_x = (((buf[0] & 0x0070) << 4) | buf[1]) - 1;  in st1232_ts_read_resolution()
127 	*max_y = (((buf[0] & 0x0007) << 8) | buf[2]) - 1;  in st1232_ts_read_resolution()
134 	struct input_dev *input = ts->input_dev;  in st1232_ts_parse_and_report()
141 	for (i = 0; i < ts->chip_info->max_fingers; i++) {  in st1232_ts_parse_and_report()
142 		u8 *buf = &ts->read_buf[i * 4];  in st1232_ts_parse_and_report()
149 					       &ts->prop, x, y);  in st1232_ts_parse_and_report()
151 			/* st1232 includes a z-axis / touch strength */  in st1232_ts_parse_and_report()
152 			if (ts->chip_info->have_z)  in st1232_ts_parse_and_report()
153 				z[n_contacts] = ts->read_buf[i + 6];  in st1232_ts_parse_and_report()
161 		if (touch_overlay_process_contact(&ts->touch_overlay_list,  in st1232_ts_parse_and_report()
169 		if (ts->chip_info->have_z)  in st1232_ts_parse_and_report()
173 	touch_overlay_sync_frame(&ts->touch_overlay_list, input);  in st1232_ts_parse_and_report()
186 	error = st1232_ts_read_data(ts, REG_XY_COORDINATES, ts->read_buf_len);  in st1232_ts_irq_handler()
192 		if (ts->low_latency_req.dev) {  in st1232_ts_irq_handler()
193 			dev_pm_qos_remove_request(&ts->low_latency_req);  in st1232_ts_irq_handler()
194 			ts->low_latency_req.dev = NULL;  in st1232_ts_irq_handler()
196 	} else if (!ts->low_latency_req.dev) {  in st1232_ts_irq_handler()
198 		dev_pm_qos_add_ancestor_request(&ts->client->dev,  in st1232_ts_irq_handler()
199 						&ts->low_latency_req,  in st1232_ts_irq_handler()
209 	if (ts->reset_gpio)  in st1232_ts_power()
210 		gpiod_set_value_cansleep(ts->reset_gpio, !poweron);  in st1232_ts_power()
239 	match = device_get_match_data(&client->dev);  in st1232_ts_probe()
241 		match = (const void *)id->driver_data;  in st1232_ts_probe()
243 		dev_err(&client->dev, "unknown device model\n");  in st1232_ts_probe()
244 		return -ENODEV;  in st1232_ts_probe()
247 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in st1232_ts_probe()
248 		dev_err(&client->dev, "need I2C_FUNC_I2C\n");  in st1232_ts_probe()
249 		return -EIO;  in st1232_ts_probe()
252 	if (!client->irq) {  in st1232_ts_probe()
253 		dev_err(&client->dev, "no IRQ?\n");  in st1232_ts_probe()
254 		return -EINVAL;  in st1232_ts_probe()
257 	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);  in st1232_ts_probe()
259 		return -ENOMEM;  in st1232_ts_probe()
261 	ts->chip_info = match;  in st1232_ts_probe()
264 	ts->read_buf_len = ts->chip_info->max_fingers * 4;  in st1232_ts_probe()
265 	ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);  in st1232_ts_probe()
266 	if (!ts->read_buf)  in st1232_ts_probe()
267 		return -ENOMEM;  in st1232_ts_probe()
269 	input_dev = devm_input_allocate_device(&client->dev);  in st1232_ts_probe()
271 		return -ENOMEM;  in st1232_ts_probe()
273 	ts->client = client;  in st1232_ts_probe()
274 	ts->input_dev = input_dev;  in st1232_ts_probe()
276 	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,  in st1232_ts_probe()
278 	if (IS_ERR(ts->reset_gpio)) {  in st1232_ts_probe()
279 		error = PTR_ERR(ts->reset_gpio);  in st1232_ts_probe()
280 		dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",  in st1232_ts_probe()
287 	error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);  in st1232_ts_probe()
289 		dev_err(&client->dev,  in st1232_ts_probe()
294 	input_dev->name = "st1232-touchscreen";  in st1232_ts_probe()
295 	input_dev->id.bustype = BUS_I2C;  in st1232_ts_probe()
302 	if (ts->chip_info->have_z)  in st1232_ts_probe()
304 				     ts->chip_info->max_area, 0, 0);  in st1232_ts_probe()
306 	/* map overlay objects if defined in the device tree */  in st1232_ts_probe()
307 	INIT_LIST_HEAD(&ts->touch_overlay_list);  in st1232_ts_probe()
308 	error = touch_overlay_map(&ts->touch_overlay_list, input_dev);  in st1232_ts_probe()
312 	if (touch_overlay_mapped_touchscreen(&ts->touch_overlay_list)) {  in st1232_ts_probe()
313 		/* Read resolution from the overlay touchscreen if defined */  in st1232_ts_probe()
314 		touch_overlay_get_touchscreen_abs(&ts->touch_overlay_list,  in st1232_ts_probe()
320 			dev_err(&client->dev,  in st1232_ts_probe()
331 	touchscreen_parse_properties(input_dev, true, &ts->prop);  in st1232_ts_probe()
333 	error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers,  in st1232_ts_probe()
337 		dev_err(&client->dev, "failed to initialize MT slots\n");  in st1232_ts_probe()
341 	error = devm_request_threaded_irq(&client->dev, client->irq,  in st1232_ts_probe()
344 					  client->name, ts);  in st1232_ts_probe()
346 		dev_err(&client->dev, "Failed to register interrupt\n");  in st1232_ts_probe()
350 	error = input_register_device(ts->input_dev);  in st1232_ts_probe()
352 		dev_err(&client->dev, "Unable to register %s input device\n",  in st1232_ts_probe()
353 			input_dev->name);  in st1232_ts_probe()
367 	disable_irq(client->irq);  in st1232_ts_suspend()
369 	if (!device_may_wakeup(&client->dev))  in st1232_ts_suspend()
380 	if (!device_may_wakeup(&client->dev))  in st1232_ts_resume()
383 	enable_irq(client->irq);  in st1232_ts_resume()