1 // SPDX-License-Identifier: GPL-2.0
7  * https://www.mipi.org/mipi-sdca-v1-0-download
13 #include <linux/device.h>
21 #include <sound/soc-component.h>
75 static irqreturn_t base_handler(int irq, void *data)  in base_handler()  argument
78 	struct device *dev = interrupt->component->dev;  in base_handler()
80 	dev_info(dev, "%s irq without full handling\n", interrupt->name);  in base_handler()
85 static irqreturn_t function_status_handler(int irq, void *data)  in function_status_handler()  argument
88 	struct device *dev = interrupt->component->dev;  in function_status_handler()
94 	reg = SDW_SDCA_CTL(interrupt->function->desc->adr, interrupt->entity->id,  in function_status_handler()
95 			   interrupt->control->sel, 0);  in function_status_handler()
97 	ret = regmap_read(interrupt->component->regmap, reg, &val);  in function_status_handler()
130 	ret = regmap_write(interrupt->component->regmap, reg, val);  in function_status_handler()
139 static irqreturn_t detected_mode_handler(int irq, void *data)  in detected_mode_handler()  argument
142 	struct snd_soc_component *component = interrupt->component;  in detected_mode_handler()
143 	struct device *dev = component->dev;  in detected_mode_handler()
144 	struct snd_soc_card *card = component->card;  in detected_mode_handler()
145 	struct rw_semaphore *rwsem = &card->snd_card->controls_rwsem;  in detected_mode_handler()
146 	struct snd_kcontrol *kctl = interrupt->priv;  in detected_mode_handler()
154 							   interrupt->entity->label,  in detected_mode_handler()
166 		interrupt->priv = kctl;  in detected_mode_handler()
169 	soc_enum = (struct soc_enum *)kctl->private_value;  in detected_mode_handler()
171 	reg = SDW_SDCA_CTL(interrupt->function->desc->adr, interrupt->entity->id,  in detected_mode_handler()
172 			   interrupt->control->sel, 0);  in detected_mode_handler()
174 	ret = regmap_read(component->regmap, reg, &val);  in detected_mode_handler()
183 		reg = SDW_SDCA_CTL(interrupt->function->desc->adr,  in detected_mode_handler()
184 				   interrupt->entity->id,  in detected_mode_handler()
190 		 * detected mode is unknown we need to see what the device  in detected_mode_handler()
193 		regcache_drop_region(component->regmap, reg, reg);  in detected_mode_handler()
195 		ret = regmap_read(component->regmap, reg, &val);  in detected_mode_handler()
197 			dev_err(dev, "failed to re-check selected mode: %d\n", ret);  in detected_mode_handler()
205 	dev_dbg(dev, "%s: %#x\n", interrupt->name, val);  in detected_mode_handler()
211 	ucontrol->value.enumerated.item[0] = snd_soc_enum_val_to_item(soc_enum, val);  in detected_mode_handler()
214 	ret = kctl->put(kctl, ucontrol);  in detected_mode_handler()
221 	snd_ctl_notify(card->snd_card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);  in detected_mode_handler()
226 static int sdca_irq_request_locked(struct device *dev,  in sdca_irq_request_locked()
231 	int irq;  in sdca_irq_request_locked()  local
234 	irq = regmap_irq_get_virq(info->irq_data, sdca_irq);  in sdca_irq_request_locked()
235 	if (irq < 0)  in sdca_irq_request_locked()
236 		return irq;  in sdca_irq_request_locked()
238 	ret = devm_request_threaded_irq(dev, irq, NULL, handler,  in sdca_irq_request_locked()
243 	dev_dbg(dev, "requested irq %d for %s\n", irq, name);  in sdca_irq_request_locked()
249  * sdca_request_irq - request an individual SDCA interrupt
250  * @dev: Pointer to the struct device against which things should be allocated.
253  * @name: Name to be given to the IRQ.
254  * @handler: A callback thread function to be called for the IRQ.
258  * a device requires custom IRQ handling this can be called manually before
259  * calling sdca_irq_populate, which will then skip that IRQ whilst processing.
263 int sdca_irq_request(struct device *dev, struct sdca_interrupt_info *info,  in sdca_irq_request()
270 		dev_err(dev, "bad irq request: %d\n", sdca_irq);  in sdca_irq_request()
271 		return -EINVAL;  in sdca_irq_request()
274 	guard(mutex)(&info->irq_lock);  in sdca_irq_request()
278 		dev_err(dev, "failed to request irq %s: %d\n", name, ret);  in sdca_irq_request()
282 	info->irqs[sdca_irq].externally_requested = true;  in sdca_irq_request()
289  * sdca_irq_data_populate - Populate common interrupt data
294  * @interrupt: Pointer to the SDCA interrupt for this IRQ.
304 	struct device *dev = component->dev;  in sdca_irq_data_populate()
307 	name = devm_kasprintf(dev, GFP_KERNEL, "%s %s %s", function->desc->name,  in sdca_irq_data_populate()
308 			      entity->label, control->label);  in sdca_irq_data_populate()
310 		return -ENOMEM;  in sdca_irq_data_populate()
312 	interrupt->name = name;  in sdca_irq_data_populate()
313 	interrupt->component = component;  in sdca_irq_data_populate()
314 	interrupt->function = function;  in sdca_irq_data_populate()
315 	interrupt->entity = entity;  in sdca_irq_data_populate()
316 	interrupt->control = control;  in sdca_irq_data_populate()
323  * sdca_irq_populate - Request all the individual IRQs for an SDCA Function
326  * @info: Pointer to the SDCA interrupt info for this device.
336 	struct device *dev = component->dev;  in sdca_irq_populate()
339 	guard(mutex)(&info->irq_lock);  in sdca_irq_populate()
341 	for (i = 0; i < function->num_entities; i++) {  in sdca_irq_populate()
342 		struct sdca_entity *entity = &function->entities[i];  in sdca_irq_populate()
344 		for (j = 0; j < entity->num_controls; j++) {  in sdca_irq_populate()
345 			struct sdca_control *control = &entity->controls[j];  in sdca_irq_populate()
346 			int irq = control->interrupt_position;  in sdca_irq_populate()  local
351 			if (irq == SDCA_NO_INTERRUPT) {  in sdca_irq_populate()
353 			} else if (irq < 0 || irq >= SDCA_MAX_INTERRUPTS) {  in sdca_irq_populate()
354 				dev_err(dev, "bad irq position: %d\n", irq);  in sdca_irq_populate()
355 				return -EINVAL;  in sdca_irq_populate()
358 			interrupt = &info->irqs[irq];  in sdca_irq_populate()
360 			if (interrupt->externally_requested) {  in sdca_irq_populate()
362 					"skipping irq %d, externally requested\n",  in sdca_irq_populate()
363 					irq);  in sdca_irq_populate()
374 			switch (entity->type) {  in sdca_irq_populate()
376 				if (control->sel == SDCA_CTL_ENTITY_0_FUNCTION_STATUS)  in sdca_irq_populate()
380 				if (control->sel == SDCA_CTL_GE_DETECTED_MODE)  in sdca_irq_populate()
387 			ret = sdca_irq_request_locked(dev, info, irq, interrupt->name,  in sdca_irq_populate()
390 				dev_err(dev, "failed to request irq %s: %d\n",  in sdca_irq_populate()
391 					interrupt->name, ret);  in sdca_irq_populate()
402  * sdca_irq_allocate - allocate an SDCA interrupt structure for a device
403  * @dev: Device pointer against which things should be allocated.
404  * @regmap: regmap to be used for accessing the SDCA IRQ registers.
405  * @irq: The interrupt number.
408  * SDCA device, as only a single instance is required across all Functions
409  * on the device.
414 struct sdca_interrupt_info *sdca_irq_allocate(struct device *dev,  in sdca_irq_allocate()
415 					      struct regmap *regmap, int irq)  in sdca_irq_allocate()  argument
422 		return ERR_PTR(-ENOMEM);  in sdca_irq_allocate()
424 	info->irq_chip = sdca_irq_chip;  in sdca_irq_allocate()
426 	ret = devm_mutex_init(dev, &info->irq_lock);  in sdca_irq_allocate()
430 	ret = devm_regmap_add_irq_chip(dev, regmap, irq, IRQF_ONESHOT, 0,  in sdca_irq_allocate()
431 				       &info->irq_chip, &info->irq_data);  in sdca_irq_allocate()
433 		dev_err(dev, "failed to register irq chip: %d\n", ret);  in sdca_irq_allocate()
437 	dev_dbg(dev, "registered on irq %d\n", irq);  in sdca_irq_allocate()
444 MODULE_DESCRIPTION("SDCA IRQ library");