[linux.git] / drivers / mfd / ezx-pcap.c

/*
 * Driver for Motorola PCAP2 as present in EZX phones
 *
 * Copyright (C) 2006 Harald Welte <[email protected]>
 * Copyright (C) 2009 Daniel Ribeiro <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#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_adc_sync_request {
	u16 res[2];
	struct completion completion;
};

struct pcap_chip {
	struct spi_device *spi;

	/* IO */
	u32 buf;
	struct mutex io_mutex;

	/* 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;
	struct mutex adc_mutex;
};

/* 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)
{
	int ret;

	mutex_lock(&pcap->io_mutex);
	value &= PCAP_REGISTER_VALUE_MASK;
	value |= PCAP_REGISTER_WRITE_OP_BIT
		| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
	ret = ezx_pcap_putget(pcap, &value);
	mutex_unlock(&pcap->io_mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(ezx_pcap_write);

int ezx_pcap_read(struct pcap_chip *pcap, u8 reg_num, u32 *value)
{
	int ret;

	mutex_lock(&pcap->io_mutex);
	*value = PCAP_REGISTER_READ_OP_BIT
		| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);

	ret = ezx_pcap_putget(pcap, value);
	mutex_unlock(&pcap->io_mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(ezx_pcap_read);

int ezx_pcap_set_bits(struct pcap_chip *pcap, u8 reg_num, u32 mask, u32 val)
{
	int ret;
	u32 tmp = PCAP_REGISTER_READ_OP_BIT |
		(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);

	mutex_lock(&pcap->io_mutex);
	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:
	mutex_unlock(&pcap->io_mutex);

	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);

		local_irq_disable();
		service = isr & ~msr;
		for (irq = pcap->irq_base; service; service >>= 1, irq++) {
			if (service & 1)
				generic_handle_irq(irq);
		}
		local_irq_enable();
		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)
{
	u32 tmp;

	mutex_lock(&pcap->adc_mutex);
	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);
	mutex_unlock(&pcap->adc_mutex);
}
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)
{
	u32 tmp;
	u8 head;

	mutex_lock(&pcap->adc_mutex);
	head = pcap->adc_head;
	if (!pcap->adc_queue[head]) {
		/* queue is empty, save power */
		pcap_disable_adc(pcap);
		mutex_unlock(&pcap->adc_mutex);
		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);
	mutex_unlock(&pcap->adc_mutex);
	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;

	mutex_lock(&pcap->adc_mutex);
	req = pcap->adc_queue[pcap->adc_head];

	if (WARN(!req, "adc irq without pending request\n")) {
		mutex_unlock(&pcap->adc_mutex);
		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);
	mutex_unlock(&pcap->adc_mutex);

	/* 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;

	/* This will be freed after we have a result */
	req = kmalloc(sizeof(struct pcap_adc_request), GFP_KERNEL);
	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;

	mutex_lock(&pcap->adc_mutex);
	if (pcap->adc_queue[pcap->adc_tail]) {
		mutex_unlock(&pcap->adc_mutex);
		kfree(req);
		return -EBUSY;
	}
	pcap->adc_queue[pcap->adc_tail] = req;
	pcap->adc_tail = (pcap->adc_tail + 1) & (PCAP_ADC_MAXQ - 1);
	mutex_unlock(&pcap->adc_mutex);

	/* start conversion */
	pcap_adc_trigger(pcap);

	return 0;
}
EXPORT_SYMBOL_GPL(pcap_adc_async);

static void pcap_adc_sync_cb(void *param, u16 res[])
{
	struct pcap_adc_sync_request *req = param;

	req->res[0] = res[0];
	req->res[1] = res[1];
	complete(&req->completion);
}

int pcap_adc_sync(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
								u16 res[])
{
	struct pcap_adc_sync_request sync_data;
	int ret;

	init_completion(&sync_data.completion);
	ret = pcap_adc_async(pcap, bank, flags, ch, pcap_adc_sync_cb,
								&sync_data);
	if (ret)
		return ret;
	wait_for_completion(&sync_data.completion);
	res[0] = sync_data.res[0];
	res[1] = sync_data.res[1];

	return 0;
}
EXPORT_SYMBOL_GPL(pcap_adc_sync);

/* 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 int ezx_pcap_remove(struct spi_device *spi)
{
	struct pcap_chip *pcap = spi_get_drvdata(spi);
	int i;

	/* remove all registered subdevs */
	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);

	/* cleanup ADC */
	mutex_lock(&pcap->adc_mutex);
	for (i = 0; i < PCAP_ADC_MAXQ; i++)
		kfree(pcap->adc_queue[i]);
	mutex_unlock(&pcap->adc_mutex);

	/* cleanup irqchip */
	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
		irq_set_chip_and_handler(i, NULL, NULL);

	destroy_workqueue(pcap->workqueue);

	return 0;
}

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 = -ENODEV;

	/* platform data is required */
	if (!pdata)
		goto ret;

	pcap = devm_kzalloc(&spi->dev, sizeof(*pcap), GFP_KERNEL);
	if (!pcap) {
		ret = -ENOMEM;
		goto ret;
	}

	mutex_init(&pcap->io_mutex);
	mutex_init(&pcap->adc_mutex);
	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)
		goto ret;

	pcap->spi = spi;

	/* setup irq */
	pcap->irq_base = pdata->irq_base;
	pcap->workqueue = create_singlethread_workqueue("pcapd");
	if (!pcap->workqueue) {
		ret = -ENOMEM;
		dev_err(&spi->dev, "can't create pcap thread\n");
		goto ret;
	}

	/* 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);
/* destroy_workqueue: */
	destroy_workqueue(pcap->workqueue);
ret:
	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_LICENSE("GPL");
MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
MODULE_DESCRIPTION("Motorola PCAP2 ASIC Driver");
MODULE_ALIAS("spi:ezx-pcap");
Commit	Line	Data
13a09f93 DR	1	/*
	2	* Driver for Motorola PCAP2 as present in EZX phones
	3	*
	4	* Copyright (C) 2006 Harald Welte <[email protected]>
	5	* Copyright (C) 2009 Daniel Ribeiro <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/irq.h>
	18	#include <linux/mfd/ezx-pcap.h>
	19	#include <linux/spi/spi.h>
b1148fd4	20	#include <linux/gpio.h>
5a0e3ad6	21	#include <linux/slab.h>
13a09f93 DR	22
	23	#define PCAP_ADC_MAXQ 8
	24	struct pcap_adc_request {
	25	u8 bank;
	26	u8 ch[2];
	27	u32 flags;
	28	void (callback)(void , u16[]);
	29	void *data;
	30	};
	31
	32	struct pcap_adc_sync_request {
	33	u16 res[2];
	34	struct completion completion;
	35	};
	36
	37	struct pcap_chip {
	38	struct spi_device *spi;
	39
	40	/* IO */
	41	u32 buf;
	42	struct mutex io_mutex;
	43
	44	/* IRQ */
	45	unsigned int irq_base;
	46	u32 msr;
	47	struct work_struct isr_work;
	48	struct work_struct msr_work;
	49	struct workqueue_struct *workqueue;
	50
	51	/* ADC */
	52	struct pcap_adc_request *adc_queue[PCAP_ADC_MAXQ];
	53	u8 adc_head;
	54	u8 adc_tail;
	55	struct mutex adc_mutex;
	56	};
	57
	58	/* IO */
	59	static int ezx_pcap_putget(struct pcap_chip pcap, u32 data)
	60	{
	61	struct spi_transfer t;
	62	struct spi_message m;
	63	int status;
	64
0309528a	65	memset(&t, 0, sizeof(t));
13a09f93 DR	66	spi_message_init(&m);
	67	t.len = sizeof(u32);
	68	spi_message_add_tail(&t, &m);
	69
	70	pcap->buf = *data;
	71	t.tx_buf = (u8 *) &pcap->buf;
	72	t.rx_buf = (u8 *) &pcap->buf;
	73	status = spi_sync(pcap->spi, &m);
	74
	75	if (status == 0)
	76	*data = pcap->buf;
	77
	78	return status;
	79	}
	80
	81	int ezx_pcap_write(struct pcap_chip *pcap, u8 reg_num, u32 value)
	82	{
	83	int ret;
	84
	85	mutex_lock(&pcap->io_mutex);
	86	value &= PCAP_REGISTER_VALUE_MASK;
	87	value \|= PCAP_REGISTER_WRITE_OP_BIT
	88	\| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
	89	ret = ezx_pcap_putget(pcap, &value);
	90	mutex_unlock(&pcap->io_mutex);
	91
	92	return ret;
	93	}
	94	EXPORT_SYMBOL_GPL(ezx_pcap_write);
	95
	96	int ezx_pcap_read(struct pcap_chip pcap, u8 reg_num, u32 value)
	97	{
	98	int ret;
	99
	100	mutex_lock(&pcap->io_mutex);
	101	*value = PCAP_REGISTER_READ_OP_BIT
	102	\| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
	103
	104	ret = ezx_pcap_putget(pcap, value);
	105	mutex_unlock(&pcap->io_mutex);
	106
	107	return ret;
	108	}
	109	EXPORT_SYMBOL_GPL(ezx_pcap_read);
	110
e9a22635 DR	111	int ezx_pcap_set_bits(struct pcap_chip *pcap, u8 reg_num, u32 mask, u32 val)
	112	{
	113	int ret;
	114	u32 tmp = PCAP_REGISTER_READ_OP_BIT \|
	115	(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
	116
	117	mutex_lock(&pcap->io_mutex);
	118	ret = ezx_pcap_putget(pcap, &tmp);
	119	if (ret)
	120	goto out_unlock;
	121
	122	tmp &= (PCAP_REGISTER_VALUE_MASK & ~mask);
	123	tmp \|= (val & mask) \| PCAP_REGISTER_WRITE_OP_BIT \|
	124	(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
	125
	126	ret = ezx_pcap_putget(pcap, &tmp);
	127	out_unlock:
	128	mutex_unlock(&pcap->io_mutex);
	129
	130	return ret;
	131	}
	132	EXPORT_SYMBOL_GPL(ezx_pcap_set_bits);
	133
13a09f93	134	/* IRQ */
9f7b07d6	135	int irq_to_pcap(struct pcap_chip *pcap, int irq)
13a09f93	136	{
9f7b07d6	137	return irq - pcap->irq_base;
13a09f93	138	}
9f7b07d6	139	EXPORT_SYMBOL_GPL(irq_to_pcap);
13a09f93 DR	140
	141	int pcap_to_irq(struct pcap_chip *pcap, int irq)
	142	{
	143	return pcap->irq_base + irq;
	144	}
	145	EXPORT_SYMBOL_GPL(pcap_to_irq);
	146
c232f22f	147	static void pcap_mask_irq(struct irq_data *d)
13a09f93	148	{
c232f22f	149	struct pcap_chip *pcap = irq_data_get_irq_chip_data(d);
13a09f93	150
c232f22f	151	pcap->msr \|= 1 << irq_to_pcap(pcap, d->irq);
13a09f93 DR	152	queue_work(pcap->workqueue, &pcap->msr_work);
	153	}
	154
c232f22f	155	static void pcap_unmask_irq(struct irq_data *d)
13a09f93	156	{
c232f22f	157	struct pcap_chip *pcap = irq_data_get_irq_chip_data(d);
13a09f93	158
c232f22f	159	pcap->msr &= ~(1 << irq_to_pcap(pcap, d->irq));
13a09f93 DR	160	queue_work(pcap->workqueue, &pcap->msr_work);
	161	}
	162
	163	static struct irq_chip pcap_irq_chip = {
c232f22f	164	.name = "pcap",
73a6839f	165	.irq_disable = pcap_mask_irq,
c232f22f LB	166	.irq_mask = pcap_mask_irq,
c232f22f LB	167	.irq_unmask = pcap_unmask_irq,
13a09f93 DR	168	};
	169
	170	static void pcap_msr_work(struct work_struct *work)
	171	{
	172	struct pcap_chip *pcap = container_of(work, struct pcap_chip, msr_work);
	173
	174	ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
	175	}
	176
	177	static void pcap_isr_work(struct work_struct *work)
	178	{
	179	struct pcap_chip *pcap = container_of(work, struct pcap_chip, isr_work);
334a41ce	180	struct pcap_platform_data *pdata = dev_get_platdata(&pcap->spi->dev);
13a09f93 DR	181	u32 msr, isr, int_sel, service;
	182	int irq;
	183
b1148fd4 DR	184	do {
	185	ezx_pcap_read(pcap, PCAP_REG_MSR, &msr);
	186	ezx_pcap_read(pcap, PCAP_REG_ISR, &isr);
13a09f93	187
25985edc	188	/* We can't service/ack irqs that are assigned to port 2 */
b1148fd4 DR	189	if (!(pdata->config & PCAP_SECOND_PORT)) {
	190	ezx_pcap_read(pcap, PCAP_REG_INT_SEL, &int_sel);
	191	isr &= ~int_sel;
	192	}
13a09f93	193
b1148fd4 DR	194	ezx_pcap_write(pcap, PCAP_REG_MSR, isr \| msr);
b1148fd4 DR	195	ezx_pcap_write(pcap, PCAP_REG_ISR, isr);
13a09f93	196
b1148fd4 DR	197	local_irq_disable();
	198	service = isr & ~msr;
	199	for (irq = pcap->irq_base; service; service >>= 1, irq++) {
73a6839f TG	200	if (service & 1)
73a6839f TG	201	generic_handle_irq(irq);
13a09f93	202	}
b1148fd4 DR	203	local_irq_enable();
b1148fd4 DR	204	ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
59ee93a5	205	} while (gpio_get_value(pdata->gpio));
13a09f93 DR	206	}
13a09f93 DR	207
bd0b9ac4	208	static void pcap_irq_handler(struct irq_desc *desc)
13a09f93	209	{
1e84aa44	210	struct pcap_chip *pcap = irq_desc_get_handler_data(desc);
13a09f93	211
c232f22f	212	desc->irq_data.chip->irq_ack(&desc->irq_data);
13a09f93	213	queue_work(pcap->workqueue, &pcap->isr_work);
13a09f93 DR	214	}
	215
	216	/* ADC */
ecd78cbd DR	217	void pcap_set_ts_bits(struct pcap_chip *pcap, u32 bits)
	218	{
	219	u32 tmp;
	220
	221	mutex_lock(&pcap->adc_mutex);
	222	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	223	tmp &= ~(PCAP_ADC_TS_M_MASK \| PCAP_ADC_TS_REF_LOWPWR);
	224	tmp \|= bits & (PCAP_ADC_TS_M_MASK \| PCAP_ADC_TS_REF_LOWPWR);
	225	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
	226	mutex_unlock(&pcap->adc_mutex);
	227	}
	228	EXPORT_SYMBOL_GPL(pcap_set_ts_bits);
	229
13a09f93 DR	230	static void pcap_disable_adc(struct pcap_chip *pcap)
	231	{
	232	u32 tmp;
	233
	234	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	235	tmp &= ~(PCAP_ADC_ADEN\|PCAP_ADC_BATT_I_ADC\|PCAP_ADC_BATT_I_POLARITY);
	236	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
	237	}
	238
	239	static void pcap_adc_trigger(struct pcap_chip *pcap)
	240	{
	241	u32 tmp;
	242	u8 head;
	243
	244	mutex_lock(&pcap->adc_mutex);
	245	head = pcap->adc_head;
	246	if (!pcap->adc_queue[head]) {
	247	/* queue is empty, save power */
	248	pcap_disable_adc(pcap);
	249	mutex_unlock(&pcap->adc_mutex);
	250	return;
	251	}
ecd78cbd DR	252	/* start conversion on requested bank, save TS_M bits */
	253	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	254	tmp &= (PCAP_ADC_TS_M_MASK \| PCAP_ADC_TS_REF_LOWPWR);
	255	tmp \|= pcap->adc_queue[head]->flags \| PCAP_ADC_ADEN;
13a09f93 DR	256
	257	if (pcap->adc_queue[head]->bank == PCAP_ADC_BANK_1)
	258	tmp \|= PCAP_ADC_AD_SEL1;
	259
	260	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
ecd78cbd	261	mutex_unlock(&pcap->adc_mutex);
13a09f93 DR	262	ezx_pcap_write(pcap, PCAP_REG_ADR, PCAP_ADR_ASC);
	263	}
	264
	265	static irqreturn_t pcap_adc_irq(int irq, void *_pcap)
	266	{
	267	struct pcap_chip *pcap = _pcap;
	268	struct pcap_adc_request *req;
	269	u16 res[2];
	270	u32 tmp;
	271
	272	mutex_lock(&pcap->adc_mutex);
	273	req = pcap->adc_queue[pcap->adc_head];
	274
e0084aa9	275	if (WARN(!req, "adc irq without pending request\n")) {
1c90ea2c	276	mutex_unlock(&pcap->adc_mutex);
13a09f93	277	return IRQ_HANDLED;
1c90ea2c	278	}
13a09f93 DR	279
	280	/* read requested channels results */
	281	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	282	tmp &= ~(PCAP_ADC_ADA1_MASK \| PCAP_ADC_ADA2_MASK);
	283	tmp \|= (req->ch[0] << PCAP_ADC_ADA1_SHIFT);
	284	tmp \|= (req->ch[1] << PCAP_ADC_ADA2_SHIFT);
	285	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
	286	ezx_pcap_read(pcap, PCAP_REG_ADR, &tmp);
	287	res[0] = (tmp & PCAP_ADR_ADD1_MASK) >> PCAP_ADR_ADD1_SHIFT;
	288	res[1] = (tmp & PCAP_ADR_ADD2_MASK) >> PCAP_ADR_ADD2_SHIFT;
	289
	290	pcap->adc_queue[pcap->adc_head] = NULL;
	291	pcap->adc_head = (pcap->adc_head + 1) & (PCAP_ADC_MAXQ - 1);
	292	mutex_unlock(&pcap->adc_mutex);
	293
	294	/* pass the results and release memory */
	295	req->callback(req->data, res);
	296	kfree(req);
	297
	298	/* trigger next conversion (if any) on queue */
	299	pcap_adc_trigger(pcap);
	300
	301	return IRQ_HANDLED;
	302	}
	303
	304	int pcap_adc_async(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
	305	void callback, void data)
	306	{
	307	struct pcap_adc_request *req;
	308
	309	/* This will be freed after we have a result */
	310	req = kmalloc(sizeof(struct pcap_adc_request), GFP_KERNEL);
	311	if (!req)
	312	return -ENOMEM;
	313
	314	req->bank = bank;
	315	req->flags = flags;
	316	req->ch[0] = ch[0];
	317	req->ch[1] = ch[1];
	318	req->callback = callback;
	319	req->data = data;
	320
	321	mutex_lock(&pcap->adc_mutex);
	322	if (pcap->adc_queue[pcap->adc_tail]) {
	323	mutex_unlock(&pcap->adc_mutex);
	324	kfree(req);
	325	return -EBUSY;
	326	}
	327	pcap->adc_queue[pcap->adc_tail] = req;
	328	pcap->adc_tail = (pcap->adc_tail + 1) & (PCAP_ADC_MAXQ - 1);
	329	mutex_unlock(&pcap->adc_mutex);
	330
	331	/* start conversion */
	332	pcap_adc_trigger(pcap);
	333
	334	return 0;
	335	}
	336	EXPORT_SYMBOL_GPL(pcap_adc_async);
	337
	338	static void pcap_adc_sync_cb(void *param, u16 res[])
	339	{
	340	struct pcap_adc_sync_request *req = param;
	341
	342	req->res[0] = res[0];
343	req->res[1] = res[1];
344	complete(&req->completion);
345	}
346
347	int pcap_adc_sync(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
348	u16 res[])
349	{
350	struct pcap_adc_sync_request sync_data;
351	int ret;
352
353	init_completion(&sync_data.completion);
354	ret = pcap_adc_async(pcap, bank, flags, ch, pcap_adc_sync_cb,
355	&sync_data);
356	if (ret)
357	return ret;
358	wait_for_completion(&sync_data.completion);
359	res[0] = sync_data.res[0];
360	res[1] = sync_data.res[1];
361
362	return 0;
363	}
364	EXPORT_SYMBOL_GPL(pcap_adc_sync);
365
366	/* subdevs */
367	static int pcap_remove_subdev(struct device dev, void unused)
368	{
369	platform_device_unregister(to_platform_device(dev));
370	return 0;
371	}
372
f791be49	373	static int pcap_add_subdev(struct pcap_chip *pcap,
13a09f93 DR	374	struct pcap_subdev *subdev)
	375	{
	376	struct platform_device *pdev;
09ff21e0	377	int ret;
13a09f93 DR	378
13a09f93 DR	379	pdev = platform_device_alloc(subdev->name, subdev->id);
09ff21e0 AL	380	if (!pdev)
	381	return -ENOMEM;
	382
13a09f93 DR	383	pdev->dev.parent = &pcap->spi->dev;
13a09f93 DR	384	pdev->dev.platform_data = subdev->platform_data;
13a09f93	385
09ff21e0 AL	386	ret = platform_device_add(pdev);
	387	if (ret)
	388	platform_device_put(pdev);
	389
	390	return ret;
13a09f93 DR	391	}
13a09f93 DR	392
4740f73f	393	static int ezx_pcap_remove(struct spi_device *spi)
13a09f93	394	{
7c478b40	395	struct pcap_chip *pcap = spi_get_drvdata(spi);
89720264	396	int i;
13a09f93 DR	397
	398	/* remove all registered subdevs */
	399	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
	400
	401	/* cleanup ADC */
13a09f93 DR	402	mutex_lock(&pcap->adc_mutex);
	403	for (i = 0; i < PCAP_ADC_MAXQ; i++)
	404	kfree(pcap->adc_queue[i]);
	405	mutex_unlock(&pcap->adc_mutex);
	406
	407	/* cleanup irqchip */
	408	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
d5bb1221	409	irq_set_chip_and_handler(i, NULL, NULL);
13a09f93 DR	410
	411	destroy_workqueue(pcap->workqueue);
	412
13a09f93 DR	413	return 0;
	414	}
	415
f791be49	416	static int ezx_pcap_probe(struct spi_device *spi)
13a09f93	417	{
334a41ce	418	struct pcap_platform_data *pdata = dev_get_platdata(&spi->dev);
13a09f93 DR	419	struct pcap_chip *pcap;
	420	int i, adc_irq;
	421	int ret = -ENODEV;
	422
	423	/* platform data is required */
	424	if (!pdata)
	425	goto ret;
	426
1ba895e0	427	pcap = devm_kzalloc(&spi->dev, sizeof(*pcap), GFP_KERNEL);
13a09f93 DR	428	if (!pcap) {
	429	ret = -ENOMEM;
	430	goto ret;
	431	}
	432
	433	mutex_init(&pcap->io_mutex);
	434	mutex_init(&pcap->adc_mutex);
	435	INIT_WORK(&pcap->isr_work, pcap_isr_work);
	436	INIT_WORK(&pcap->msr_work, pcap_msr_work);
7c478b40	437	spi_set_drvdata(spi, pcap);
13a09f93 DR	438
	439	/* setup spi */
	440	spi->bits_per_word = 32;
	441	spi->mode = SPI_MODE_0 \| (pdata->config & PCAP_CS_AH ? SPI_CS_HIGH : 0);
	442	ret = spi_setup(spi);
	443	if (ret)
1ba895e0	444	goto ret;
13a09f93 DR	445
	446	pcap->spi = spi;
	447
	448	/* setup irq */
	449	pcap->irq_base = pdata->irq_base;
	450	pcap->workqueue = create_singlethread_workqueue("pcapd");
	451	if (!pcap->workqueue) {
47dabaee	452	ret = -ENOMEM;
25985edc	453	dev_err(&spi->dev, "can't create pcap thread\n");
1ba895e0	454	goto ret;
13a09f93 DR	455	}
	456
	457	/* redirect interrupts to AP, except adcdone2 */
	458	if (!(pdata->config & PCAP_SECOND_PORT))
	459	ezx_pcap_write(pcap, PCAP_REG_INT_SEL,
	460	(1 << PCAP_IRQ_ADCDONE2));
	461
	462	/* setup irq chip */
	463	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++) {
d5bb1221 TG	464	irq_set_chip_and_handler(i, &pcap_irq_chip, handle_simple_irq);
d5bb1221 TG	465	irq_set_chip_data(i, pcap);
9bd09f34	466	irq_clear_status_flags(i, IRQ_NOREQUEST \| IRQ_NOPROBE);
13a09f93 DR	467	}
	468
	469	/* mask/ack all PCAP interrupts */
	470	ezx_pcap_write(pcap, PCAP_REG_MSR, PCAP_MASK_ALL_INTERRUPT);
	471	ezx_pcap_write(pcap, PCAP_REG_ISR, PCAP_CLEAR_INTERRUPT_REGISTER);
	472	pcap->msr = PCAP_MASK_ALL_INTERRUPT;
	473
d5bb1221	474	irq_set_irq_type(spi->irq, IRQ_TYPE_EDGE_RISING);
c89fc9ac	475	irq_set_chained_handler_and_data(spi->irq, pcap_irq_handler, pcap);
d5bb1221	476	irq_set_irq_wake(spi->irq, 1);
13a09f93 DR	477
	478	/* ADC */
	479	adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?
	480	PCAP_IRQ_ADCDONE2 : PCAP_IRQ_ADCDONE);
	481
1ba895e0 JH	482	ret = devm_request_irq(&spi->dev, adc_irq, pcap_adc_irq, 0, "ADC",
1ba895e0 JH	483	pcap);
13a09f93 DR	484	if (ret)
	485	goto free_irqchip;
	486
	487	/* setup subdevs */
	488	for (i = 0; i < pdata->num_subdevs; i++) {
	489	ret = pcap_add_subdev(pcap, &pdata->subdevs[i]);
	490	if (ret)
	491	goto remove_subdevs;
	492	}
	493
	494	/* board specific quirks */
	495	if (pdata->init)
	496	pdata->init(pcap);
	497
	498	return 0;
	499
	500	remove_subdevs:
	501	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
13a09f93 DR	502	free_irqchip:
13a09f93 DR	503	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
d5bb1221	504	irq_set_chip_and_handler(i, NULL, NULL);
13a09f93 DR	505	/* destroy_workqueue: */
13a09f93 DR	506	destroy_workqueue(pcap->workqueue);
13a09f93 DR	507	ret:
	508	return ret;
	509	}
	510
	511	static struct spi_driver ezxpcap_driver = {
	512	.probe = ezx_pcap_probe,
84449216	513	.remove = ezx_pcap_remove,
13a09f93 DR	514	.driver = {
13a09f93 DR	515	.name = "ezx-pcap",
13a09f93 DR	516	},
	517	};
	518
	519	static int __init ezx_pcap_init(void)
	520	{
	521	return spi_register_driver(&ezxpcap_driver);
	522	}
	523
	524	static void __exit ezx_pcap_exit(void)
	525	{
	526	spi_unregister_driver(&ezxpcap_driver);
	527	}
	528
f078237b	529	subsys_initcall(ezx_pcap_init);
13a09f93 DR	530	module_exit(ezx_pcap_exit);
	531
	532	MODULE_LICENSE("GPL");
	533	MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
	534	MODULE_DESCRIPTION("Motorola PCAP2 ASIC Driver");
e0626e38	535	MODULE_ALIAS("spi:ezx-pcap");