mfd: ezx-pcap: Remove unused driver

Support for the Motorola EZX phones based on Intel PXA processors was
removed in 2022, but this driver remained present in the tree. As far
as I can tell, the support was never quite functional upstream because
the board files did not actually instantiate the SPI device for the PCAP.

There are still also drivers for the various mfd cells: keys, touchscreen,
regulator and rtc, all of which are obviously orphaned as well but can
be removed separately as the Kconfig dependency now prevents them from
being enabled.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202604301209.f1YXTsIr-lkp@intel.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Acked-by: Harald Welte <laforge@gnumonks.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260430162855.2029285-1-arnd@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>

3 files changed, 0 insertions, 499 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 7192c9d1d268..d08d70d41bce 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1199,13 +1199,6 @@ config MFD_OCELOT
 
 	  If unsure, say N.
 
-config EZX_PCAP
-	bool "Motorola EZXPCAP Support"
-	depends on SPI_MASTER
-	help
-	  This enables the PCAP ASIC present on EZX Phones. This is
-	  needed for MMC, TouchScreen, Sound, USB, etc..
-
 config MFD_CPCAP
 	tristate "Support for Motorola CPCAP"
 	depends on SPI
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e75e8045c28a..dd4bb7e77c33 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -131,7 +131,6 @@ obj-$(CONFIG_MFD_CORE)		+= mfd-core.o
 ocelot-soc-objs			:= ocelot-core.o ocelot-spi.o
 obj-$(CONFIG_MFD_OCELOT)	+= ocelot-soc.o
 
-obj-$(CONFIG_EZX_PCAP)		+= ezx-pcap.o
 obj-$(CONFIG_MFD_CPCAP)		+= motorola-cpcap.o
 
 obj-$(CONFIG_MCP)		+= mcp-core.o
diff --git a/drivers/mfd/ezx-pcap.c b/drivers/mfd/ezx-pcap.c
deleted file mode 100644
index 9a685ff8cd15..000000000000
--- a/drivers/mfd/ezx-pcap.c
+++ /dev/null
@@ -1,491 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Driver for Motorola PCAP2 as present in EZX phones
- *
- * Copyright (C) 2006 Harald Welte <laforge@openezx.org>
- * Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/mfd/ezx-pcap.h>
-#include <linux/spi/spi.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-
-#define PCAP_ADC_MAXQ		8
-struct pcap_adc_request {
-	u8 bank;
-	u8 ch[2];
-	u32 flags;
-	void (*callback)(void *, u16[]);
-	void *data;
-};
-
-struct pcap_chip {
-	struct spi_device *spi;
-
-	/* IO */
-	u32 buf;
-	spinlock_t io_lock;
-
-	/* IRQ */
-	unsigned int irq_base;
-	u32 msr;
-	struct work_struct isr_work;
-	struct work_struct msr_work;
-	struct workqueue_struct *workqueue;
-
-	/* ADC */
-	struct pcap_adc_request *adc_queue[PCAP_ADC_MAXQ];
-	u8 adc_head;
-	u8 adc_tail;
-	spinlock_t adc_lock;
-};
-
-/* IO */
-static int ezx_pcap_putget(struct pcap_chip *pcap, u32 *data)
-{
-	struct spi_transfer t;
-	struct spi_message m;
-	int status;
-
-	memset(&t, 0, sizeof(t));
-	spi_message_init(&m);
-	t.len = sizeof(u32);
-	spi_message_add_tail(&t, &m);
-
-	pcap->buf = *data;
-	t.tx_buf = (u8 *) &pcap->buf;
-	t.rx_buf = (u8 *) &pcap->buf;
-	status = spi_sync(pcap->spi, &m);
-
-	if (status == 0)
-		*data = pcap->buf;
-
-	return status;
-}
-
-int ezx_pcap_write(struct pcap_chip *pcap, u8 reg_num, u32 value)
-{
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pcap->io_lock, flags);
-	value &= PCAP_REGISTER_VALUE_MASK;
-	value |= PCAP_REGISTER_WRITE_OP_BIT
-		| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
-	ret = ezx_pcap_putget(pcap, &value);
-	spin_unlock_irqrestore(&pcap->io_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(ezx_pcap_write);
-
-int ezx_pcap_read(struct pcap_chip *pcap, u8 reg_num, u32 *value)
-{
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pcap->io_lock, flags);
-	*value = PCAP_REGISTER_READ_OP_BIT
-		| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
-
-	ret = ezx_pcap_putget(pcap, value);
-	spin_unlock_irqrestore(&pcap->io_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(ezx_pcap_read);
-
-int ezx_pcap_set_bits(struct pcap_chip *pcap, u8 reg_num, u32 mask, u32 val)
-{
-	unsigned long flags;
-	int ret;
-	u32 tmp = PCAP_REGISTER_READ_OP_BIT |
-		(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
-
-	spin_lock_irqsave(&pcap->io_lock, flags);
-	ret = ezx_pcap_putget(pcap, &tmp);
-	if (ret)
-		goto out_unlock;
-
-	tmp &= (PCAP_REGISTER_VALUE_MASK & ~mask);
-	tmp |= (val & mask) | PCAP_REGISTER_WRITE_OP_BIT |
-		(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
-
-	ret = ezx_pcap_putget(pcap, &tmp);
-out_unlock:
-	spin_unlock_irqrestore(&pcap->io_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(ezx_pcap_set_bits);
-
-/* IRQ */
-int irq_to_pcap(struct pcap_chip *pcap, int irq)
-{
-	return irq - pcap->irq_base;
-}
-EXPORT_SYMBOL_GPL(irq_to_pcap);
-
-int pcap_to_irq(struct pcap_chip *pcap, int irq)
-{
-	return pcap->irq_base + irq;
-}
-EXPORT_SYMBOL_GPL(pcap_to_irq);
-
-static void pcap_mask_irq(struct irq_data *d)
-{
-	struct pcap_chip *pcap = irq_data_get_irq_chip_data(d);
-
-	pcap->msr |= 1 << irq_to_pcap(pcap, d->irq);
-	queue_work(pcap->workqueue, &pcap->msr_work);
-}
-
-static void pcap_unmask_irq(struct irq_data *d)
-{
-	struct pcap_chip *pcap = irq_data_get_irq_chip_data(d);
-
-	pcap->msr &= ~(1 << irq_to_pcap(pcap, d->irq));
-	queue_work(pcap->workqueue, &pcap->msr_work);
-}
-
-static struct irq_chip pcap_irq_chip = {
-	.name		= "pcap",
-	.irq_disable	= pcap_mask_irq,
-	.irq_mask	= pcap_mask_irq,
-	.irq_unmask	= pcap_unmask_irq,
-};
-
-static void pcap_msr_work(struct work_struct *work)
-{
-	struct pcap_chip *pcap = container_of(work, struct pcap_chip, msr_work);
-
-	ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
-}
-
-static void pcap_isr_work(struct work_struct *work)
-{
-	struct pcap_chip *pcap = container_of(work, struct pcap_chip, isr_work);
-	struct pcap_platform_data *pdata = dev_get_platdata(&pcap->spi->dev);
-	u32 msr, isr, int_sel, service;
-	int irq;
-
-	do {
-		ezx_pcap_read(pcap, PCAP_REG_MSR, &msr);
-		ezx_pcap_read(pcap, PCAP_REG_ISR, &isr);
-
-		/* We can't service/ack irqs that are assigned to port 2 */
-		if (!(pdata->config & PCAP_SECOND_PORT)) {
-			ezx_pcap_read(pcap, PCAP_REG_INT_SEL, &int_sel);
-			isr &= ~int_sel;
-		}
-
-		ezx_pcap_write(pcap, PCAP_REG_MSR, isr | msr);
-		ezx_pcap_write(pcap, PCAP_REG_ISR, isr);
-
-		service = isr & ~msr;
-		for (irq = pcap->irq_base; service; service >>= 1, irq++) {
-			if (service & 1)
-				generic_handle_irq_safe(irq);
-		}
-		ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
-	} while (gpio_get_value(pdata->gpio));
-}
-
-static void pcap_irq_handler(struct irq_desc *desc)
-{
-	struct pcap_chip *pcap = irq_desc_get_handler_data(desc);
-
-	desc->irq_data.chip->irq_ack(&desc->irq_data);
-	queue_work(pcap->workqueue, &pcap->isr_work);
-}
-
-/* ADC */
-void pcap_set_ts_bits(struct pcap_chip *pcap, u32 bits)
-{
-	unsigned long flags;
-	u32 tmp;
-
-	spin_lock_irqsave(&pcap->adc_lock, flags);
-	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
-	tmp &= ~(PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
-	tmp |= bits & (PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
-	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
-	spin_unlock_irqrestore(&pcap->adc_lock, flags);
-}
-EXPORT_SYMBOL_GPL(pcap_set_ts_bits);
-
-static void pcap_disable_adc(struct pcap_chip *pcap)
-{
-	u32 tmp;
-
-	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
-	tmp &= ~(PCAP_ADC_ADEN|PCAP_ADC_BATT_I_ADC|PCAP_ADC_BATT_I_POLARITY);
-	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
-}
-
-static void pcap_adc_trigger(struct pcap_chip *pcap)
-{
-	unsigned long flags;
-	u32 tmp;
-	u8 head;
-
-	spin_lock_irqsave(&pcap->adc_lock, flags);
-	head = pcap->adc_head;
-	if (!pcap->adc_queue[head]) {
-		/* queue is empty, save power */
-		pcap_disable_adc(pcap);
-		spin_unlock_irqrestore(&pcap->adc_lock, flags);
-		return;
-	}
-	/* start conversion on requested bank, save TS_M bits */
-	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
-	tmp &= (PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
-	tmp |= pcap->adc_queue[head]->flags | PCAP_ADC_ADEN;
-
-	if (pcap->adc_queue[head]->bank == PCAP_ADC_BANK_1)
-		tmp |= PCAP_ADC_AD_SEL1;
-
-	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
-	spin_unlock_irqrestore(&pcap->adc_lock, flags);
-	ezx_pcap_write(pcap, PCAP_REG_ADR, PCAP_ADR_ASC);
-}
-
-static irqreturn_t pcap_adc_irq(int irq, void *_pcap)
-{
-	struct pcap_chip *pcap = _pcap;
-	struct pcap_adc_request *req;
-	u16 res[2];
-	u32 tmp;
-
-	spin_lock(&pcap->adc_lock);
-	req = pcap->adc_queue[pcap->adc_head];
-
-	if (WARN(!req, "adc irq without pending request\n")) {
-		spin_unlock(&pcap->adc_lock);
-		return IRQ_HANDLED;
-	}
-
-	/* read requested channels results */
-	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
-	tmp &= ~(PCAP_ADC_ADA1_MASK | PCAP_ADC_ADA2_MASK);
-	tmp |= (req->ch[0] << PCAP_ADC_ADA1_SHIFT);
-	tmp |= (req->ch[1] << PCAP_ADC_ADA2_SHIFT);
-	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
-	ezx_pcap_read(pcap, PCAP_REG_ADR, &tmp);
-	res[0] = (tmp & PCAP_ADR_ADD1_MASK) >> PCAP_ADR_ADD1_SHIFT;
-	res[1] = (tmp & PCAP_ADR_ADD2_MASK) >> PCAP_ADR_ADD2_SHIFT;
-
-	pcap->adc_queue[pcap->adc_head] = NULL;
-	pcap->adc_head = (pcap->adc_head + 1) & (PCAP_ADC_MAXQ - 1);
-	spin_unlock(&pcap->adc_lock);
-
-	/* pass the results and release memory */
-	req->callback(req->data, res);
-	kfree(req);
-
-	/* trigger next conversion (if any) on queue */
-	pcap_adc_trigger(pcap);
-
-	return IRQ_HANDLED;
-}
-
-int pcap_adc_async(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
-						void *callback, void *data)
-{
-	struct pcap_adc_request *req;
-	unsigned long irq_flags;
-
-	/* This will be freed after we have a result */
-	req = kmalloc_obj(struct pcap_adc_request);
-	if (!req)
-		return -ENOMEM;
-
-	req->bank = bank;
-	req->flags = flags;
-	req->ch[0] = ch[0];
-	req->ch[1] = ch[1];
-	req->callback = callback;
-	req->data = data;
-
-	spin_lock_irqsave(&pcap->adc_lock, irq_flags);
-	if (pcap->adc_queue[pcap->adc_tail]) {
-		spin_unlock_irqrestore(&pcap->adc_lock, irq_flags);
-		kfree(req);
-		return -EBUSY;
-	}
-	pcap->adc_queue[pcap->adc_tail] = req;
-	pcap->adc_tail = (pcap->adc_tail + 1) & (PCAP_ADC_MAXQ - 1);
-	spin_unlock_irqrestore(&pcap->adc_lock, irq_flags);
-
-	/* start conversion */
-	pcap_adc_trigger(pcap);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pcap_adc_async);
-
-/* subdevs */
-static int pcap_remove_subdev(struct device *dev, void *unused)
-{
-	platform_device_unregister(to_platform_device(dev));
-	return 0;
-}
-
-static int pcap_add_subdev(struct pcap_chip *pcap,
-						struct pcap_subdev *subdev)
-{
-	struct platform_device *pdev;
-	int ret;
-
-	pdev = platform_device_alloc(subdev->name, subdev->id);
-	if (!pdev)
-		return -ENOMEM;
-
-	pdev->dev.parent = &pcap->spi->dev;
-	pdev->dev.platform_data = subdev->platform_data;
-
-	ret = platform_device_add(pdev);
-	if (ret)
-		platform_device_put(pdev);
-
-	return ret;
-}
-
-static void ezx_pcap_remove(struct spi_device *spi)
-{
-	struct pcap_chip *pcap = spi_get_drvdata(spi);
-	unsigned long flags;
-	int i;
-
-	/* remove all registered subdevs */
-	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
-
-	/* cleanup ADC */
-	spin_lock_irqsave(&pcap->adc_lock, flags);
-	for (i = 0; i < PCAP_ADC_MAXQ; i++)
-		kfree(pcap->adc_queue[i]);
-	spin_unlock_irqrestore(&pcap->adc_lock, flags);
-
-	/* cleanup irqchip */
-	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
-		irq_set_chip_and_handler(i, NULL, NULL);
-}
-
-static int ezx_pcap_probe(struct spi_device *spi)
-{
-	struct pcap_platform_data *pdata = dev_get_platdata(&spi->dev);
-	struct pcap_chip *pcap;
-	int i, adc_irq;
-	int ret;
-
-	/* platform data is required */
-	if (!pdata)
-		return -ENODEV;
-
-	pcap = devm_kzalloc(&spi->dev, sizeof(*pcap), GFP_KERNEL);
-	if (!pcap)
-		return -ENOMEM;
-
-	spin_lock_init(&pcap->io_lock);
-	spin_lock_init(&pcap->adc_lock);
-	INIT_WORK(&pcap->isr_work, pcap_isr_work);
-	INIT_WORK(&pcap->msr_work, pcap_msr_work);
-	spi_set_drvdata(spi, pcap);
-
-	/* setup spi */
-	spi->bits_per_word = 32;
-	spi->mode = SPI_MODE_0 | (pdata->config & PCAP_CS_AH ? SPI_CS_HIGH : 0);
-	ret = spi_setup(spi);
-	if (ret)
-		return ret;
-
-	pcap->spi = spi;
-
-	/* setup irq */
-	pcap->irq_base = pdata->irq_base;
-	pcap->workqueue = devm_alloc_ordered_workqueue(&spi->dev, "pcapd", 0);
-	if (!pcap->workqueue)
-		return -ENOMEM;
-
-	/* redirect interrupts to AP, except adcdone2 */
-	if (!(pdata->config & PCAP_SECOND_PORT))
-		ezx_pcap_write(pcap, PCAP_REG_INT_SEL,
-					(1 << PCAP_IRQ_ADCDONE2));
-
-	/* setup irq chip */
-	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++) {
-		irq_set_chip_and_handler(i, &pcap_irq_chip, handle_simple_irq);
-		irq_set_chip_data(i, pcap);
-		irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
-	}
-
-	/* mask/ack all PCAP interrupts */
-	ezx_pcap_write(pcap, PCAP_REG_MSR, PCAP_MASK_ALL_INTERRUPT);
-	ezx_pcap_write(pcap, PCAP_REG_ISR, PCAP_CLEAR_INTERRUPT_REGISTER);
-	pcap->msr = PCAP_MASK_ALL_INTERRUPT;
-
-	irq_set_irq_type(spi->irq, IRQ_TYPE_EDGE_RISING);
-	irq_set_chained_handler_and_data(spi->irq, pcap_irq_handler, pcap);
-	irq_set_irq_wake(spi->irq, 1);
-
-	/* ADC */
-	adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?
-					PCAP_IRQ_ADCDONE2 : PCAP_IRQ_ADCDONE);
-
-	ret = devm_request_irq(&spi->dev, adc_irq, pcap_adc_irq, 0, "ADC",
-				pcap);
-	if (ret)
-		goto free_irqchip;
-
-	/* setup subdevs */
-	for (i = 0; i < pdata->num_subdevs; i++) {
-		ret = pcap_add_subdev(pcap, &pdata->subdevs[i]);
-		if (ret)
-			goto remove_subdevs;
-	}
-
-	/* board specific quirks */
-	if (pdata->init)
-		pdata->init(pcap);
-
-	return 0;
-
-remove_subdevs:
-	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
-free_irqchip:
-	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
-		irq_set_chip_and_handler(i, NULL, NULL);
-
-	return ret;
-}
-
-static struct spi_driver ezxpcap_driver = {
-	.probe	= ezx_pcap_probe,
-	.remove = ezx_pcap_remove,
-	.driver = {
-		.name	= "ezx-pcap",
-	},
-};
-
-static int __init ezx_pcap_init(void)
-{
-	return spi_register_driver(&ezxpcap_driver);
-}
-
-static void __exit ezx_pcap_exit(void)
-{
-	spi_unregister_driver(&ezxpcap_driver);
-}
-
-subsys_initcall(ezx_pcap_init);
-module_exit(ezx_pcap_exit);
-
-MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
-MODULE_DESCRIPTION("Motorola PCAP2 ASIC Driver");
-MODULE_ALIAS("spi:ezx-pcap");