Lines Matching +full:latched +full:- +full:gpios
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()
184 mutex_lock(&gpio->lock); in pcf857x_set_multiple()
185 gpio->out &= ~*mask; in pcf857x_set_multiple()
186 gpio->out |= *bits & *mask; in pcf857x_set_multiple()
187 gpio->write(gpio->client, gpio->out); in pcf857x_set_multiple()
188 mutex_unlock(&gpio->lock); in pcf857x_set_multiple()
191 /*-------------------------------------------------------------------------*/
198 status = gpio->read(gpio->client); in pcf857x_irq()
204 mutex_lock(&gpio->lock); in pcf857x_irq()
205 change = (gpio->status ^ status) & gpio->irq_enabled; in pcf857x_irq()
206 gpio->status = status; in pcf857x_irq()
207 mutex_unlock(&gpio->lock); in pcf857x_irq()
209 for_each_set_bit(i, &change, gpio->chip.ngpio) in pcf857x_irq()
210 handle_nested_irq(irq_find_mapping(gpio->chip.irq.domain, i)); in pcf857x_irq()
224 return irq_set_irq_wake(gpio->client->irq, on); in pcf857x_irq_set_wake()
232 gpiochip_enable_irq(&gpio->chip, hwirq); in pcf857x_irq_enable()
233 gpio->irq_enabled |= (1 << hwirq); in pcf857x_irq_enable()
241 gpio->irq_enabled &= ~(1 << hwirq); in pcf857x_irq_disable()
242 gpiochip_disable_irq(&gpio->chip, hwirq); in pcf857x_irq_disable()
249 mutex_lock(&gpio->lock); in pcf857x_irq_bus_lock()
256 mutex_unlock(&gpio->lock); in pcf857x_irq_bus_sync_unlock()
273 /*-------------------------------------------------------------------------*/
283 gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL); in pcf857x_probe()
285 return -ENOMEM; in pcf857x_probe()
287 mutex_init(&gpio->lock); in pcf857x_probe()
289 gpio->chip.base = -1; in pcf857x_probe()
290 gpio->chip.can_sleep = true; in pcf857x_probe()
291 gpio->chip.parent = &client->dev; in pcf857x_probe()
292 gpio->chip.owner = THIS_MODULE; in pcf857x_probe()
293 gpio->chip.get = pcf857x_get; in pcf857x_probe()
294 gpio->chip.get_multiple = pcf857x_get_multiple; in pcf857x_probe()
295 gpio->chip.set = pcf857x_set; in pcf857x_probe()
296 gpio->chip.set_multiple = pcf857x_set_multiple; in pcf857x_probe()
297 gpio->chip.direction_input = pcf857x_input; in pcf857x_probe()
298 gpio->chip.direction_output = pcf857x_output; in pcf857x_probe()
299 gpio->chip.ngpio = (uintptr_t)i2c_get_match_data(client); in pcf857x_probe()
301 reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH); in pcf857x_probe()
303 return dev_err_probe(&client->dev, PTR_ERR(reset_gpio), in pcf857x_probe()
313 * Performing a reset means "The PCA9670 registers and I2C-bus in pcf857x_probe()
321 device_property_read_u32(&client->dev, "lines-initial-states", in pcf857x_probe()
326 * these parts, notably for output. It has a low-resolution in pcf857x_probe()
336 if (gpio->chip.ngpio == 8) { in pcf857x_probe()
337 gpio->write = i2c_write_le8; in pcf857x_probe()
338 gpio->read = i2c_read_le8; in pcf857x_probe()
340 if (!i2c_check_functionality(client->adapter, in pcf857x_probe()
342 status = -EIO; in pcf857x_probe()
354 } else if (gpio->chip.ngpio == 16) { in pcf857x_probe()
355 gpio->write = i2c_write_le16; in pcf857x_probe()
356 gpio->read = i2c_read_le16; in pcf857x_probe()
358 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) in pcf857x_probe()
359 status = -EIO; in pcf857x_probe()
366 dev_dbg(&client->dev, "unsupported number of gpios\n"); in pcf857x_probe()
367 status = -EINVAL; in pcf857x_probe()
373 gpio->chip.label = client->name; in pcf857x_probe()
375 gpio->client = client; in pcf857x_probe()
378 /* NOTE: these chips have strange "quasi-bidirectional" I/O pins. in pcf857x_probe()
382 * came out of reset (if any). We can't read the latched output. in pcf857x_probe()
390 * our software copy of the "latch" then matches the chip's all-ones in pcf857x_probe()
393 gpio->out = ~n_latch; in pcf857x_probe()
394 gpio->status = gpio->read(gpio->client); in pcf857x_probe()
397 if (client->irq) { in pcf857x_probe()
400 status = devm_request_threaded_irq(&client->dev, client->irq, in pcf857x_probe()
403 dev_name(&client->dev), gpio); in pcf857x_probe()
407 girq = &gpio->chip.irq; in pcf857x_probe()
410 girq->parent_handler = NULL; in pcf857x_probe()
411 girq->num_parents = 0; in pcf857x_probe()
412 girq->parents = NULL; in pcf857x_probe()
413 girq->default_type = IRQ_TYPE_NONE; in pcf857x_probe()
414 girq->handler = handle_level_irq; in pcf857x_probe()
415 girq->threaded = true; in pcf857x_probe()
418 status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio); in pcf857x_probe()
422 dev_info(&client->dev, "probed\n"); in pcf857x_probe()
427 dev_dbg(&client->dev, "probe error %d for '%s'\n", status, in pcf857x_probe()
428 client->name); in pcf857x_probe()
438 gpio->write(gpio->client, BIT(gpio->chip.ngpio) - 1); in pcf857x_shutdown()
456 * subsys initcalls that may rely on these GPIOs