Lines Matching +full:quasi +full:- +full:bidirectional
1 // SPDX-License-Identifier: GPL-2.0-or-later
61 * that pin be used as an input; it's not an open-drain model, but acts
62 * a bit like one. This is described as "quasi-bidirectional"; read the
82 /*-------------------------------------------------------------------------*/
84 /* Talk to 8-bit I/O expander */
96 /* Talk to 16-bit I/O expander */
118 /*-------------------------------------------------------------------------*/
125 mutex_lock(&gpio->lock); in pcf857x_input()
126 gpio->out |= (1 << offset); in pcf857x_input()
127 status = gpio->write(gpio->client, gpio->out); in pcf857x_input()
128 mutex_unlock(&gpio->lock); in pcf857x_input()
138 value = gpio->read(gpio->client); in pcf857x_get()
146 int value = gpio->read(gpio->client); in pcf857x_get_multiple()
163 mutex_lock(&gpio->lock); in pcf857x_output()
165 gpio->out |= bit; in pcf857x_output()
167 gpio->out &= ~bit; in pcf857x_output()
168 status = gpio->write(gpio->client, gpio->out); in pcf857x_output()
169 mutex_unlock(&gpio->lock); in pcf857x_output()
185 mutex_lock(&gpio->lock); in pcf857x_set_multiple()
186 gpio->out &= ~*mask; in pcf857x_set_multiple()
187 gpio->out |= *bits & *mask; in pcf857x_set_multiple()
188 status = gpio->write(gpio->client, gpio->out); in pcf857x_set_multiple()
189 mutex_unlock(&gpio->lock); in pcf857x_set_multiple()
194 /*-------------------------------------------------------------------------*/
201 status = gpio->read(gpio->client); in pcf857x_irq()
207 mutex_lock(&gpio->lock); in pcf857x_irq()
208 change = (gpio->status ^ status) & gpio->irq_enabled; in pcf857x_irq()
209 gpio->status = status; in pcf857x_irq()
210 mutex_unlock(&gpio->lock); in pcf857x_irq()
212 for_each_set_bit(i, &change, gpio->chip.ngpio) in pcf857x_irq()
213 handle_nested_irq(irq_find_mapping(gpio->chip.irq.domain, i)); in pcf857x_irq()
227 return irq_set_irq_wake(gpio->client->irq, on); in pcf857x_irq_set_wake()
235 gpiochip_enable_irq(&gpio->chip, hwirq); in pcf857x_irq_enable()
236 gpio->irq_enabled |= (1 << hwirq); in pcf857x_irq_enable()
244 gpio->irq_enabled &= ~(1 << hwirq); in pcf857x_irq_disable()
245 gpiochip_disable_irq(&gpio->chip, hwirq); in pcf857x_irq_disable()
252 mutex_lock(&gpio->lock); in pcf857x_irq_bus_lock()
259 mutex_unlock(&gpio->lock); in pcf857x_irq_bus_sync_unlock()
276 /*-------------------------------------------------------------------------*/
286 gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL); in pcf857x_probe()
288 return -ENOMEM; in pcf857x_probe()
290 mutex_init(&gpio->lock); in pcf857x_probe()
292 gpio->chip.base = -1; in pcf857x_probe()
293 gpio->chip.can_sleep = true; in pcf857x_probe()
294 gpio->chip.parent = &client->dev; in pcf857x_probe()
295 gpio->chip.owner = THIS_MODULE; in pcf857x_probe()
296 gpio->chip.get = pcf857x_get; in pcf857x_probe()
297 gpio->chip.get_multiple = pcf857x_get_multiple; in pcf857x_probe()
298 gpio->chip.set = pcf857x_set; in pcf857x_probe()
299 gpio->chip.set_multiple = pcf857x_set_multiple; in pcf857x_probe()
300 gpio->chip.direction_input = pcf857x_input; in pcf857x_probe()
301 gpio->chip.direction_output = pcf857x_output; in pcf857x_probe()
302 gpio->chip.ngpio = (uintptr_t)i2c_get_match_data(client); in pcf857x_probe()
304 reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH); in pcf857x_probe()
306 return dev_err_probe(&client->dev, PTR_ERR(reset_gpio), in pcf857x_probe()
316 * Performing a reset means "The PCA9670 registers and I2C-bus in pcf857x_probe()
324 device_property_read_u32(&client->dev, "lines-initial-states", in pcf857x_probe()
329 * these parts, notably for output. It has a low-resolution in pcf857x_probe()
339 if (gpio->chip.ngpio == 8) { in pcf857x_probe()
340 gpio->write = i2c_write_le8; in pcf857x_probe()
341 gpio->read = i2c_read_le8; in pcf857x_probe()
343 if (!i2c_check_functionality(client->adapter, in pcf857x_probe()
345 status = -EIO; in pcf857x_probe()
357 } else if (gpio->chip.ngpio == 16) { in pcf857x_probe()
358 gpio->write = i2c_write_le16; in pcf857x_probe()
359 gpio->read = i2c_read_le16; in pcf857x_probe()
361 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) in pcf857x_probe()
362 status = -EIO; in pcf857x_probe()
369 dev_dbg(&client->dev, "unsupported number of gpios\n"); in pcf857x_probe()
370 status = -EINVAL; in pcf857x_probe()
376 gpio->chip.label = client->name; in pcf857x_probe()
378 gpio->client = client; in pcf857x_probe()
381 /* NOTE: these chips have strange "quasi-bidirectional" I/O pins. in pcf857x_probe()
393 * our software copy of the "latch" then matches the chip's all-ones in pcf857x_probe()
396 gpio->out = ~n_latch; in pcf857x_probe()
397 gpio->status = gpio->read(gpio->client); in pcf857x_probe()
400 if (client->irq) { in pcf857x_probe()
403 status = devm_request_threaded_irq(&client->dev, client->irq, in pcf857x_probe()
406 dev_name(&client->dev), gpio); in pcf857x_probe()
410 girq = &gpio->chip.irq; in pcf857x_probe()
413 girq->parent_handler = NULL; in pcf857x_probe()
414 girq->num_parents = 0; in pcf857x_probe()
415 girq->parents = NULL; in pcf857x_probe()
416 girq->default_type = IRQ_TYPE_NONE; in pcf857x_probe()
417 girq->handler = handle_level_irq; in pcf857x_probe()
418 girq->threaded = true; in pcf857x_probe()
421 status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio); in pcf857x_probe()
425 dev_info(&client->dev, "probed\n"); in pcf857x_probe()
430 dev_dbg(&client->dev, "probe error %d for '%s'\n", status, in pcf857x_probe()
431 client->name); in pcf857x_probe()
441 gpio->write(gpio->client, BIT(gpio->chip.ngpio) - 1); in pcf857x_shutdown()