1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for Motorola PCAP2 as present in EZX phones
14 #include <linux/mfd/ezx-pcap.h>
15 #include <linux/spi/spi.h>
34 	struct spi_device *spi;  member
66 	pcap->buf = *data;  in ezx_pcap_putget()
67 	t.tx_buf = (u8 *) &pcap->buf;  in ezx_pcap_putget()
68 	t.rx_buf = (u8 *) &pcap->buf;  in ezx_pcap_putget()
69 	status = spi_sync(pcap->spi, &m);  in ezx_pcap_putget()
72 		*data = pcap->buf;  in ezx_pcap_putget()
82 	spin_lock_irqsave(&pcap->io_lock, flags);  in ezx_pcap_write()
87 	spin_unlock_irqrestore(&pcap->io_lock, flags);  in ezx_pcap_write()
98 	spin_lock_irqsave(&pcap->io_lock, flags);  in ezx_pcap_read()
103 	spin_unlock_irqrestore(&pcap->io_lock, flags);  in ezx_pcap_read()
109 int ezx_pcap_set_bits(struct pcap_chip *pcap, u8 reg_num, u32 mask, u32 val)  in ezx_pcap_set_bits()  argument
116 	spin_lock_irqsave(&pcap->io_lock, flags);  in ezx_pcap_set_bits()
121 	tmp &= (PCAP_REGISTER_VALUE_MASK & ~mask);  in ezx_pcap_set_bits()
122 	tmp |= (val & mask) | PCAP_REGISTER_WRITE_OP_BIT |  in ezx_pcap_set_bits()
127 	spin_unlock_irqrestore(&pcap->io_lock, flags);  in ezx_pcap_set_bits()
136 	return irq - pcap->irq_base;  in irq_to_pcap()
142 	return pcap->irq_base + irq;  in pcap_to_irq()
150 	pcap->msr |= 1 << irq_to_pcap(pcap, d->irq);  in pcap_mask_irq()
151 	queue_work(pcap->workqueue, &pcap->msr_work);  in pcap_mask_irq()
158 	pcap->msr &= ~(1 << irq_to_pcap(pcap, d->irq));  in pcap_unmask_irq()
159 	queue_work(pcap->workqueue, &pcap->msr_work);  in pcap_unmask_irq()
173 	ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);  in pcap_msr_work()
179 	struct pcap_platform_data *pdata = dev_get_platdata(&pcap->spi->dev);  in pcap_isr_work()
188 		if (!(pdata->config & PCAP_SECOND_PORT)) {  in pcap_isr_work()
197 		for (irq = pcap->irq_base; service; service >>= 1, irq++) {  in pcap_isr_work()
201 		ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);  in pcap_isr_work()
202 	} while (gpio_get_value(pdata->gpio));  in pcap_isr_work()
209 	desc->irq_data.chip->irq_ack(&desc->irq_data);  in pcap_irq_handler()
210 	queue_work(pcap->workqueue, &pcap->isr_work);  in pcap_irq_handler()
219 	spin_lock_irqsave(&pcap->adc_lock, flags);  in pcap_set_ts_bits()
224 	spin_unlock_irqrestore(&pcap->adc_lock, flags);  in pcap_set_ts_bits()
243 	spin_lock_irqsave(&pcap->adc_lock, flags);  in pcap_adc_trigger()
244 	head = pcap->adc_head;  in pcap_adc_trigger()
245 	if (!pcap->adc_queue[head]) {  in pcap_adc_trigger()
248 		spin_unlock_irqrestore(&pcap->adc_lock, flags);  in pcap_adc_trigger()
254 	tmp |= pcap->adc_queue[head]->flags | PCAP_ADC_ADEN;  in pcap_adc_trigger()
256 	if (pcap->adc_queue[head]->bank == PCAP_ADC_BANK_1)  in pcap_adc_trigger()
260 	spin_unlock_irqrestore(&pcap->adc_lock, flags);  in pcap_adc_trigger()
271 	spin_lock(&pcap->adc_lock);  in pcap_adc_irq()
272 	req = pcap->adc_queue[pcap->adc_head];  in pcap_adc_irq()
275 		spin_unlock(&pcap->adc_lock);  in pcap_adc_irq()
282 	tmp |= (req->ch[0] << PCAP_ADC_ADA1_SHIFT);  in pcap_adc_irq()
283 	tmp |= (req->ch[1] << PCAP_ADC_ADA2_SHIFT);  in pcap_adc_irq()
289 	pcap->adc_queue[pcap->adc_head] = NULL;  in pcap_adc_irq()
290 	pcap->adc_head = (pcap->adc_head + 1) & (PCAP_ADC_MAXQ - 1);  in pcap_adc_irq()
291 	spin_unlock(&pcap->adc_lock);  in pcap_adc_irq()
294 	req->callback(req->data, res);  in pcap_adc_irq()
312 		return -ENOMEM;  in pcap_adc_async()
314 	req->bank = bank;  in pcap_adc_async()
315 	req->flags = flags;  in pcap_adc_async()
316 	req->ch[0] = ch[0];  in pcap_adc_async()
317 	req->ch[1] = ch[1];  in pcap_adc_async()
318 	req->callback = callback;  in pcap_adc_async()
319 	req->data = data;  in pcap_adc_async()
321 	spin_lock_irqsave(&pcap->adc_lock, irq_flags);  in pcap_adc_async()
322 	if (pcap->adc_queue[pcap->adc_tail]) {  in pcap_adc_async()
323 		spin_unlock_irqrestore(&pcap->adc_lock, irq_flags);  in pcap_adc_async()
325 		return -EBUSY;  in pcap_adc_async()
327 	pcap->adc_queue[pcap->adc_tail] = req;  in pcap_adc_async()
328 	pcap->adc_tail = (pcap->adc_tail + 1) & (PCAP_ADC_MAXQ - 1);  in pcap_adc_async()
329 	spin_unlock_irqrestore(&pcap->adc_lock, irq_flags);  in pcap_adc_async()
342 	req->res[0] = res[0];  in pcap_adc_sync_cb()
343 	req->res[1] = res[1];  in pcap_adc_sync_cb()
344 	complete(&req->completion);  in pcap_adc_sync_cb()
379 	pdev = platform_device_alloc(subdev->name, subdev->id);  in pcap_add_subdev()
381 		return -ENOMEM;  in pcap_add_subdev()
383 	pdev->dev.parent = &pcap->spi->dev;  in pcap_add_subdev()
384 	pdev->dev.platform_data = subdev->platform_data;  in pcap_add_subdev()
393 static void ezx_pcap_remove(struct spi_device *spi)  in ezx_pcap_remove()  argument
395 	struct pcap_chip *pcap = spi_get_drvdata(spi);  in ezx_pcap_remove()
400 	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);  in ezx_pcap_remove()
403 	spin_lock_irqsave(&pcap->adc_lock, flags);  in ezx_pcap_remove()
405 		kfree(pcap->adc_queue[i]);  in ezx_pcap_remove()
406 	spin_unlock_irqrestore(&pcap->adc_lock, flags);  in ezx_pcap_remove()
409 	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)  in ezx_pcap_remove()
412 	destroy_workqueue(pcap->workqueue);  in ezx_pcap_remove()
415 static int ezx_pcap_probe(struct spi_device *spi)  in ezx_pcap_probe()  argument
417 	struct pcap_platform_data *pdata = dev_get_platdata(&spi->dev);  in ezx_pcap_probe()
420 	int ret = -ENODEV;  in ezx_pcap_probe()
426 	pcap = devm_kzalloc(&spi->dev, sizeof(*pcap), GFP_KERNEL);  in ezx_pcap_probe()
428 		ret = -ENOMEM;  in ezx_pcap_probe()
432 	spin_lock_init(&pcap->io_lock);  in ezx_pcap_probe()
433 	spin_lock_init(&pcap->adc_lock);  in ezx_pcap_probe()
434 	INIT_WORK(&pcap->isr_work, pcap_isr_work);  in ezx_pcap_probe()
435 	INIT_WORK(&pcap->msr_work, pcap_msr_work);  in ezx_pcap_probe()
436 	spi_set_drvdata(spi, pcap);  in ezx_pcap_probe()
438 	/* setup spi */  in ezx_pcap_probe()
439 	spi->bits_per_word = 32;  in ezx_pcap_probe()
440 	spi->mode = SPI_MODE_0 | (pdata->config & PCAP_CS_AH ? SPI_CS_HIGH : 0);  in ezx_pcap_probe()
441 	ret = spi_setup(spi);  in ezx_pcap_probe()
445 	pcap->spi = spi;  in ezx_pcap_probe()
448 	pcap->irq_base = pdata->irq_base;  in ezx_pcap_probe()
449 	pcap->workqueue = create_singlethread_workqueue("pcapd");  in ezx_pcap_probe()
450 	if (!pcap->workqueue) {  in ezx_pcap_probe()
451 		ret = -ENOMEM;  in ezx_pcap_probe()
452 		dev_err(&spi->dev, "can't create pcap thread\n");  in ezx_pcap_probe()
457 	if (!(pdata->config & PCAP_SECOND_PORT))  in ezx_pcap_probe()
462 	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++) {  in ezx_pcap_probe()
468 	/* mask/ack all PCAP interrupts */  in ezx_pcap_probe()
471 	pcap->msr = PCAP_MASK_ALL_INTERRUPT;  in ezx_pcap_probe()
473 	irq_set_irq_type(spi->irq, IRQ_TYPE_EDGE_RISING);  in ezx_pcap_probe()
474 	irq_set_chained_handler_and_data(spi->irq, pcap_irq_handler, pcap);  in ezx_pcap_probe()
475 	irq_set_irq_wake(spi->irq, 1);  in ezx_pcap_probe()
478 	adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?  in ezx_pcap_probe()
481 	ret = devm_request_irq(&spi->dev, adc_irq, pcap_adc_irq, 0, "ADC",  in ezx_pcap_probe()
487 	for (i = 0; i < pdata->num_subdevs; i++) {  in ezx_pcap_probe()
488 		ret = pcap_add_subdev(pcap, &pdata->subdevs[i]);  in ezx_pcap_probe()
494 	if (pdata->init)  in ezx_pcap_probe()
495 		pdata->init(pcap);  in ezx_pcap_probe()
500 	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);  in ezx_pcap_probe()
502 	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)  in ezx_pcap_probe()
505 	destroy_workqueue(pcap->workqueue);  in ezx_pcap_probe()
514 		.name	= "ezx-pcap",
533 MODULE_ALIAS("spi:ezx-pcap");