Lines Matching +full:touchscreen +full:- +full:x +full:- +full:plate +full:- +full:ohms
1 // SPDX-License-Identifier: GPL-2.0
3 * Rohm BU21029 touchscreen controller driver
5 * Copyright (C) 2015-2018 Bosch Sicherheitssysteme GmbH
16 #include <linux/input/touchscreen.h>
25 * +--------+--------+--------+--------+--------+--------+--------+--------+
27 * +--------+--------+--------+--------+--------+--------+--------+--------+
29 * +--------+--------+--------+--------+--------+--------+--------+--------+
31 * +--------+--------+--------+--------+--------+--------+--------+--------+
33 * +--------+--------+--------+--------+--------+--------+--------+--------+
35 * +--------+--------+--------+--------+--------+--------+--------+--------+
44 * +--------+--------+--------+--------+--------+--------+--------+--------+
46 * +--------+--------+--------+--------+--------+--------+--------+--------+
48 * +--------+--------+--------+--------+--------+--------+--------+--------+
59 * +--------+--------+--------+--------+--------+--------+--------+--------+
61 * +--------+--------+--------+--------+--------+--------+--------+--------+
63 * +--------+--------+--------+--------+--------+--------+--------+--------+
75 * +--------+--------+--------+--------+--------+--------+--------+--------+
77 * +--------+--------+--------+--------+--------+--------+--------+--------+
79 * +--------+--------+--------+--------+--------+--------+--------+--------+
91 * +--------+--------+--------+--------+--------+--------+--------+--------+
93 * +--------+--------+--------+--------+--------+--------+--------+--------+
95 * +--------+--------+--------+--------+--------+--------+--------+--------+
100 * PU90K: 0 = internal pull-up resistance for touch detection is ~50kohms (*)
101 * 1 = internal pull-up resistance for touch detection is ~90kohms
112 * +--------+--------+--------+--------+--------+--------+--------+--------+
114 * +--------+--------+--------+--------+--------+--------+--------+--------+
116 * +--------+--------+--------+--------+--------+--------+--------+--------+
125 * +--------+--------+--------+--------+--------+--------+--------+--------+
127 * +--------+--------+--------+--------+--------+--------+--------+--------+
129 * +--------+--------+--------+--------+--------+--------+--------+--------+
152 #define MAX_12BIT ((1 << 12) - 1)
167 u16 x, y, z1, z2; in bu21029_touch_report() local
169 s32 max_pressure = input_abs_get_max(bu21029->in_dev, ABS_PRESSURE); in bu21029_touch_report()
173 * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ in bu21029_touch_report()
175 * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ in bu21029_touch_report()
177 * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ in bu21029_touch_report()
179 * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ in bu21029_touch_report()
181 x = (buf[0] << 4) | (buf[1] >> 4); in bu21029_touch_report()
189 * Rz = Rx * (x/Q) * ((z2/z1) - 1), where in bu21029_touch_report()
190 * Rx is x-plate resistance, in bu21029_touch_report()
192 * x, z1, z2 are the measured positions. in bu21029_touch_report()
194 rz = z2 - z1; in bu21029_touch_report()
195 rz *= x; in bu21029_touch_report()
196 rz *= bu21029->x_plate_ohms; in bu21029_touch_report()
200 touchscreen_report_pos(bu21029->in_dev, &bu21029->prop, in bu21029_touch_report()
201 x, y, false); in bu21029_touch_report()
202 input_report_abs(bu21029->in_dev, ABS_PRESSURE, in bu21029_touch_report()
203 max_pressure - rz); in bu21029_touch_report()
204 input_report_key(bu21029->in_dev, BTN_TOUCH, 1); in bu21029_touch_report()
205 input_sync(bu21029->in_dev); in bu21029_touch_report()
214 input_report_abs(bu21029->in_dev, ABS_PRESSURE, 0); in bu21029_touch_release()
215 input_report_key(bu21029->in_dev, BTN_TOUCH, 0); in bu21029_touch_release()
216 input_sync(bu21029->in_dev); in bu21029_touch_release()
229 error = i2c_smbus_read_i2c_block_data(bu21029->client, BU21029_AUTOSCAN, in bu21029_touch_soft_irq()
237 mod_timer(&bu21029->timer, in bu21029_touch_soft_irq()
246 if (bu21029->reset_gpios) { in bu21029_put_chip_in_reset()
247 gpiod_set_value_cansleep(bu21029->reset_gpios, 1); in bu21029_put_chip_in_reset()
255 struct i2c_client *i2c = bu21029->client; in bu21029_start_chip()
269 error = regulator_enable(bu21029->vdd); in bu21029_start_chip()
271 dev_err(&i2c->dev, "failed to power up chip: %d", error); in bu21029_start_chip()
276 if (bu21029->reset_gpios) { in bu21029_start_chip()
277 gpiod_set_value_cansleep(bu21029->reset_gpios, 0); in bu21029_start_chip()
284 dev_err(&i2c->dev, "failed to read HW ID\n"); in bu21029_start_chip()
289 dev_err(&i2c->dev, in bu21029_start_chip()
290 "unsupported HW ID 0x%x\n", be16_to_cpu(hwid)); in bu21029_start_chip()
291 error = -ENODEV; in bu21029_start_chip()
300 dev_err(&i2c->dev, in bu21029_start_chip()
301 "failed to write %#02x to register %#02x: %d\n", in bu21029_start_chip()
310 dev_err(&i2c->dev, "failed to start autoscan\n"); in bu21029_start_chip()
314 enable_irq(bu21029->client->irq); in bu21029_start_chip()
319 regulator_disable(bu21029->vdd); in bu21029_start_chip()
327 disable_irq(bu21029->client->irq); in bu21029_stop_chip()
328 del_timer_sync(&bu21029->timer); in bu21029_stop_chip()
331 regulator_disable(bu21029->vdd); in bu21029_stop_chip()
336 struct device *dev = &client->dev; in bu21029_probe()
341 if (!i2c_check_functionality(client->adapter, in bu21029_probe()
346 return -EIO; in bu21029_probe()
351 return -ENOMEM; in bu21029_probe()
353 error = device_property_read_u32(dev, "rohm,x-plate-ohms", &bu21029->x_plate_ohms); in bu21029_probe()
355 dev_err(dev, "invalid 'x-plate-ohms' supplied: %d\n", error); in bu21029_probe()
359 bu21029->vdd = devm_regulator_get(dev, "vdd"); in bu21029_probe()
360 if (IS_ERR(bu21029->vdd)) in bu21029_probe()
361 return dev_err_probe(dev, PTR_ERR(bu21029->vdd), in bu21029_probe()
364 bu21029->reset_gpios = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); in bu21029_probe()
365 if (IS_ERR(bu21029->reset_gpios)) in bu21029_probe()
366 return dev_err_probe(dev, PTR_ERR(bu21029->reset_gpios), in bu21029_probe()
372 return -ENOMEM; in bu21029_probe()
375 bu21029->client = client; in bu21029_probe()
376 bu21029->in_dev = in_dev; in bu21029_probe()
377 timer_setup(&bu21029->timer, bu21029_touch_release, 0); in bu21029_probe()
379 in_dev->name = DRIVER_NAME; in bu21029_probe()
380 in_dev->id.bustype = BUS_I2C; in bu21029_probe()
381 in_dev->open = bu21029_start_chip; in bu21029_probe()
382 in_dev->close = bu21029_stop_chip; in bu21029_probe()
388 touchscreen_parse_properties(in_dev, false, &bu21029->prop); in bu21029_probe()
392 error = devm_request_threaded_irq(dev, client->irq, NULL, in bu21029_probe()
418 mutex_lock(&bu21029->in_dev->mutex); in bu21029_suspend()
419 if (input_device_enabled(bu21029->in_dev)) in bu21029_suspend()
420 bu21029_stop_chip(bu21029->in_dev); in bu21029_suspend()
421 mutex_unlock(&bu21029->in_dev->mutex); in bu21029_suspend()
433 mutex_lock(&bu21029->in_dev->mutex); in bu21029_resume()
434 if (input_device_enabled(bu21029->in_dev)) in bu21029_resume()
435 bu21029_start_chip(bu21029->in_dev); in bu21029_resume()
436 mutex_unlock(&bu21029->in_dev->mutex); in bu21029_resume()
469 MODULE_DESCRIPTION("Rohm BU21029 touchscreen controller driver");