[net-next-2.6.git] / drivers / mfd / ezx-pcap.c

/*
 * 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>
 *
 * 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(unsigned int irq)
{
	struct pcap_chip *pcap = get_irq_chip_data(irq);

	pcap->msr |= 1 << irq_to_pcap(pcap, irq);
	queue_work(pcap->workqueue, &pcap->msr_work);
}

static void pcap_unmask_irq(unsigned int irq)
{
	struct pcap_chip *pcap = get_irq_chip_data(irq);

	pcap->msr &= ~(1 << irq_to_pcap(pcap, irq));
	queue_work(pcap->workqueue, &pcap->msr_work);
}

static struct irq_chip pcap_irq_chip = {
	.name	= "pcap",
	.mask	= pcap_mask_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 = pcap->spi->dev.platform_data;
	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 cant 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) {
				struct irq_desc *desc = irq_to_desc(irq);

				if (WARN(!desc, KERN_WARNING
						"Invalid PCAP IRQ %d\n", irq))
					break;

				if (desc->status & IRQ_DISABLED)
					note_interrupt(irq, desc, IRQ_NONE);
				else
					desc->handle_irq(irq, desc);
			}
		}
		local_irq_enable();
		ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
	} while (gpio_get_value(irq_to_gpio(pcap->spi->irq)));
}

static void pcap_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct pcap_chip *pcap = get_irq_data(irq);

	desc->chip->ack(irq);
	queue_work(pcap->workqueue, &pcap->isr_work);
	return;
}

/* 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, KERN_WARNING "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 __devinit 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 __devexit ezx_pcap_remove(struct spi_device *spi)
{
	struct pcap_chip *pcap = dev_get_drvdata(&spi->dev);
	struct pcap_platform_data *pdata = spi->dev.platform_data;
	int i, adc_irq;

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

	/* cleanup ADC */
	adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?
				PCAP_IRQ_ADCDONE2 : PCAP_IRQ_ADCDONE);
	free_irq(adc_irq, pcap);
	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++)
		set_irq_chip_and_handler(i, NULL, NULL);

	destroy_workqueue(pcap->workqueue);

	kfree(pcap);

	return 0;
}

static int __devinit ezx_pcap_probe(struct spi_device *spi)
{
	struct pcap_platform_data *pdata = spi->dev.platform_data;
	struct pcap_chip *pcap;
	int i, adc_irq;
	int ret = -ENODEV;

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

	pcap = kzalloc(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);
	dev_set_drvdata(&spi->dev, 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 free_pcap;

	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, "cant create pcap thread\n");
		goto free_pcap;
	}

	/* 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++) {
		set_irq_chip_and_handler(i, &pcap_irq_chip, handle_simple_irq);
		set_irq_chip_data(i, pcap);
#ifdef CONFIG_ARM
		set_irq_flags(i, IRQF_VALID);
#else
		set_irq_noprobe(i);
#endif
	}

	/* 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;

	set_irq_type(spi->irq, IRQ_TYPE_EDGE_RISING);
	set_irq_data(spi->irq, pcap);
	set_irq_chained_handler(spi->irq, pcap_irq_handler);
	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 = request_irq(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_adc: */
	free_irq(adc_irq, pcap);
free_irqchip:
	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
		set_irq_chip_and_handler(i, NULL, NULL);
/* destroy_workqueue: */
	destroy_workqueue(pcap->workqueue);
free_pcap:
	kfree(pcap);
ret:
	return ret;
}

static struct spi_driver ezxpcap_driver = {
	.probe	= ezx_pcap_probe,
	.remove = __devexit_p(ezx_pcap_remove),
	.driver = {
		.name	= "ezx-pcap",
		.owner	= THIS_MODULE,
	},
};

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 <laforge@openezx.org>
	5	* Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
	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
	65	memset(&t, 0, sizeof t);
	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
	147	static void pcap_mask_irq(unsigned int irq)
	148	{
	149	struct pcap_chip *pcap = get_irq_chip_data(irq);
	150
9f7b07d6	151	pcap->msr \|= 1 << irq_to_pcap(pcap, irq);
13a09f93 DR	152	queue_work(pcap->workqueue, &pcap->msr_work);
	153	}
	154
	155	static void pcap_unmask_irq(unsigned int irq)
	156	{
	157	struct pcap_chip *pcap = get_irq_chip_data(irq);
	158
9f7b07d6	159	pcap->msr &= ~(1 << irq_to_pcap(pcap, irq));
13a09f93 DR	160	queue_work(pcap->workqueue, &pcap->msr_work);
	161	}
	162
	163	static struct irq_chip pcap_irq_chip = {
	164	.name = "pcap",
	165	.mask = pcap_mask_irq,
	166	.unmask = pcap_unmask_irq,
	167	};
	168
	169	static void pcap_msr_work(struct work_struct *work)
	170	{
	171	struct pcap_chip *pcap = container_of(work, struct pcap_chip, msr_work);
	172
	173	ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
	174	}
	175
	176	static void pcap_isr_work(struct work_struct *work)
	177	{
	178	struct pcap_chip *pcap = container_of(work, struct pcap_chip, isr_work);
	179	struct pcap_platform_data *pdata = pcap->spi->dev.platform_data;
	180	u32 msr, isr, int_sel, service;
	181	int irq;
	182
b1148fd4 DR	183	do {
	184	ezx_pcap_read(pcap, PCAP_REG_MSR, &msr);
	185	ezx_pcap_read(pcap, PCAP_REG_ISR, &isr);
13a09f93	186
b1148fd4 DR	187	/* We cant service/ack irqs that are assigned to port 2 */
	188	if (!(pdata->config & PCAP_SECOND_PORT)) {
	189	ezx_pcap_read(pcap, PCAP_REG_INT_SEL, &int_sel);
	190	isr &= ~int_sel;
	191	}
13a09f93	192
b1148fd4 DR	193	ezx_pcap_write(pcap, PCAP_REG_MSR, isr \| msr);
b1148fd4 DR	194	ezx_pcap_write(pcap, PCAP_REG_ISR, isr);
13a09f93	195
b1148fd4 DR	196	local_irq_disable();
	197	service = isr & ~msr;
	198	for (irq = pcap->irq_base; service; service >>= 1, irq++) {
	199	if (service & 1) {
	200	struct irq_desc *desc = irq_to_desc(irq);
13a09f93	201
b1148fd4 DR	202	if (WARN(!desc, KERN_WARNING
	203	"Invalid PCAP IRQ %d\n", irq))
	204	break;
13a09f93	205
b1148fd4 DR	206	if (desc->status & IRQ_DISABLED)
	207	note_interrupt(irq, desc, IRQ_NONE);
	208	else
	209	desc->handle_irq(irq, desc);
	210	}
13a09f93	211	}
b1148fd4 DR	212	local_irq_enable();
	213	ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
	214	} while (gpio_get_value(irq_to_gpio(pcap->spi->irq)));
13a09f93 DR	215	}
	216
	217	static void pcap_irq_handler(unsigned int irq, struct irq_desc *desc)
	218	{
	219	struct pcap_chip *pcap = get_irq_data(irq);
	220
	221	desc->chip->ack(irq);
	222	queue_work(pcap->workqueue, &pcap->isr_work);
	223	return;
	224	}
	225
	226	/* ADC */
ecd78cbd DR	227	void pcap_set_ts_bits(struct pcap_chip *pcap, u32 bits)
	228	{
	229	u32 tmp;
	230
	231	mutex_lock(&pcap->adc_mutex);
	232	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	233	tmp &= ~(PCAP_ADC_TS_M_MASK \| PCAP_ADC_TS_REF_LOWPWR);
	234	tmp \|= bits & (PCAP_ADC_TS_M_MASK \| PCAP_ADC_TS_REF_LOWPWR);
	235	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
	236	mutex_unlock(&pcap->adc_mutex);
	237	}
	238	EXPORT_SYMBOL_GPL(pcap_set_ts_bits);
	239
13a09f93 DR	240	static void pcap_disable_adc(struct pcap_chip *pcap)
	241	{
	242	u32 tmp;
	243
	244	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	245	tmp &= ~(PCAP_ADC_ADEN\|PCAP_ADC_BATT_I_ADC\|PCAP_ADC_BATT_I_POLARITY);
	246	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
	247	}
	248
	249	static void pcap_adc_trigger(struct pcap_chip *pcap)
	250	{
	251	u32 tmp;
	252	u8 head;
	253
	254	mutex_lock(&pcap->adc_mutex);
	255	head = pcap->adc_head;
	256	if (!pcap->adc_queue[head]) {
	257	/* queue is empty, save power */
	258	pcap_disable_adc(pcap);
	259	mutex_unlock(&pcap->adc_mutex);
	260	return;
	261	}
ecd78cbd DR	262	/* start conversion on requested bank, save TS_M bits */
	263	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	264	tmp &= (PCAP_ADC_TS_M_MASK \| PCAP_ADC_TS_REF_LOWPWR);
	265	tmp \|= pcap->adc_queue[head]->flags \| PCAP_ADC_ADEN;
13a09f93 DR	266
	267	if (pcap->adc_queue[head]->bank == PCAP_ADC_BANK_1)
	268	tmp \|= PCAP_ADC_AD_SEL1;
	269
	270	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
ecd78cbd	271	mutex_unlock(&pcap->adc_mutex);
13a09f93 DR	272	ezx_pcap_write(pcap, PCAP_REG_ADR, PCAP_ADR_ASC);
	273	}
	274
	275	static irqreturn_t pcap_adc_irq(int irq, void *_pcap)
	276	{
	277	struct pcap_chip *pcap = _pcap;
	278	struct pcap_adc_request *req;
	279	u16 res[2];
	280	u32 tmp;
	281
	282	mutex_lock(&pcap->adc_mutex);
	283	req = pcap->adc_queue[pcap->adc_head];
	284
1c90ea2c DR	285	if (WARN(!req, KERN_WARNING "adc irq without pending request\n")) {
1c90ea2c DR	286	mutex_unlock(&pcap->adc_mutex);
13a09f93	287	return IRQ_HANDLED;
1c90ea2c	288	}
13a09f93 DR	289
	290	/* read requested channels results */
	291	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
	292	tmp &= ~(PCAP_ADC_ADA1_MASK \| PCAP_ADC_ADA2_MASK);
	293	tmp \|= (req->ch[0] << PCAP_ADC_ADA1_SHIFT);
	294	tmp \|= (req->ch[1] << PCAP_ADC_ADA2_SHIFT);
	295	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
	296	ezx_pcap_read(pcap, PCAP_REG_ADR, &tmp);
	297	res[0] = (tmp & PCAP_ADR_ADD1_MASK) >> PCAP_ADR_ADD1_SHIFT;
	298	res[1] = (tmp & PCAP_ADR_ADD2_MASK) >> PCAP_ADR_ADD2_SHIFT;
	299
	300	pcap->adc_queue[pcap->adc_head] = NULL;
	301	pcap->adc_head = (pcap->adc_head + 1) & (PCAP_ADC_MAXQ - 1);
	302	mutex_unlock(&pcap->adc_mutex);
	303
	304	/* pass the results and release memory */
	305	req->callback(req->data, res);
	306	kfree(req);
	307
	308	/* trigger next conversion (if any) on queue */
	309	pcap_adc_trigger(pcap);
	310
	311	return IRQ_HANDLED;
	312	}
	313
	314	int pcap_adc_async(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
	315	void callback, void data)
	316	{
	317	struct pcap_adc_request *req;
	318
	319	/* This will be freed after we have a result */
	320	req = kmalloc(sizeof(struct pcap_adc_request), GFP_KERNEL);
	321	if (!req)
	322	return -ENOMEM;
	323
	324	req->bank = bank;
	325	req->flags = flags;
	326	req->ch[0] = ch[0];
	327	req->ch[1] = ch[1];
	328	req->callback = callback;
	329	req->data = data;
	330
	331	mutex_lock(&pcap->adc_mutex);
	332	if (pcap->adc_queue[pcap->adc_tail]) {
	333	mutex_unlock(&pcap->adc_mutex);
	334	kfree(req);
	335	return -EBUSY;
	336	}
	337	pcap->adc_queue[pcap->adc_tail] = req;
	338	pcap->adc_tail = (pcap->adc_tail + 1) & (PCAP_ADC_MAXQ - 1);
	339	mutex_unlock(&pcap->adc_mutex);
	340
	341	/* start conversion */
	342	pcap_adc_trigger(pcap);
	343
	344	return 0;
	345	}
	346	EXPORT_SYMBOL_GPL(pcap_adc_async);
	347
	348	static void pcap_adc_sync_cb(void *param, u16 res[])
	349	{
	350	struct pcap_adc_sync_request *req = param;
	351
	352	req->res[0] = res[0];
353	req->res[1] = res[1];
354	complete(&req->completion);
355	}
356
357	int pcap_adc_sync(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
358	u16 res[])
359	{
360	struct pcap_adc_sync_request sync_data;
361	int ret;
362
363	init_completion(&sync_data.completion);
364	ret = pcap_adc_async(pcap, bank, flags, ch, pcap_adc_sync_cb,
365	&sync_data);
366	if (ret)
367	return ret;
368	wait_for_completion(&sync_data.completion);
369	res[0] = sync_data.res[0];
370	res[1] = sync_data.res[1];
371
372	return 0;
373	}
374	EXPORT_SYMBOL_GPL(pcap_adc_sync);
375
376	/* subdevs */
377	static int pcap_remove_subdev(struct device dev, void unused)
378	{
379	platform_device_unregister(to_platform_device(dev));
380	return 0;
381	}
382
383	static int __devinit pcap_add_subdev(struct pcap_chip *pcap,
384	struct pcap_subdev *subdev)
385	{
386	struct platform_device *pdev;
09ff21e0	387	int ret;
13a09f93 DR	388
13a09f93 DR	389	pdev = platform_device_alloc(subdev->name, subdev->id);
09ff21e0 AL	390	if (!pdev)
	391	return -ENOMEM;
	392
13a09f93 DR	393	pdev->dev.parent = &pcap->spi->dev;
13a09f93 DR	394	pdev->dev.platform_data = subdev->platform_data;
13a09f93	395
09ff21e0 AL	396	ret = platform_device_add(pdev);
	397	if (ret)
	398	platform_device_put(pdev);
	399
	400	return ret;
13a09f93 DR	401	}
	402
	403	static int __devexit ezx_pcap_remove(struct spi_device *spi)
	404	{
	405	struct pcap_chip *pcap = dev_get_drvdata(&spi->dev);
	406	struct pcap_platform_data *pdata = spi->dev.platform_data;
	407	int i, adc_irq;
	408
	409	/* remove all registered subdevs */
	410	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
	411
	412	/* cleanup ADC */
	413	adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?
	414	PCAP_IRQ_ADCDONE2 : PCAP_IRQ_ADCDONE);
	415	free_irq(adc_irq, pcap);
	416	mutex_lock(&pcap->adc_mutex);
	417	for (i = 0; i < PCAP_ADC_MAXQ; i++)
	418	kfree(pcap->adc_queue[i]);
	419	mutex_unlock(&pcap->adc_mutex);
	420
	421	/* cleanup irqchip */
	422	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
	423	set_irq_chip_and_handler(i, NULL, NULL);
	424
	425	destroy_workqueue(pcap->workqueue);
	426
	427	kfree(pcap);
	428
	429	return 0;
	430	}
	431
	432	static int __devinit ezx_pcap_probe(struct spi_device *spi)
	433	{
	434	struct pcap_platform_data *pdata = spi->dev.platform_data;
	435	struct pcap_chip *pcap;
	436	int i, adc_irq;
	437	int ret = -ENODEV;
	438
	439	/* platform data is required */
	440	if (!pdata)
	441	goto ret;
	442
	443	pcap = kzalloc(sizeof(*pcap), GFP_KERNEL);
	444	if (!pcap) {
	445	ret = -ENOMEM;
	446	goto ret;
	447	}
	448
	449	mutex_init(&pcap->io_mutex);
	450	mutex_init(&pcap->adc_mutex);
	451	INIT_WORK(&pcap->isr_work, pcap_isr_work);
	452	INIT_WORK(&pcap->msr_work, pcap_msr_work);
	453	dev_set_drvdata(&spi->dev, pcap);
	454
	455	/* setup spi */
	456	spi->bits_per_word = 32;
	457	spi->mode = SPI_MODE_0 \| (pdata->config & PCAP_CS_AH ? SPI_CS_HIGH : 0);
	458	ret = spi_setup(spi);
	459	if (ret)
	460	goto free_pcap;
	461
	462	pcap->spi = spi;
	463
	464	/* setup irq */
465	pcap->irq_base = pdata->irq_base;
466	pcap->workqueue = create_singlethread_workqueue("pcapd");
467	if (!pcap->workqueue) {
47dabaee	468	ret = -ENOMEM;
13a09f93 DR	469	dev_err(&spi->dev, "cant create pcap thread\n");
	470	goto free_pcap;
	471	}
	472
	473	/* redirect interrupts to AP, except adcdone2 */
	474	if (!(pdata->config & PCAP_SECOND_PORT))
	475	ezx_pcap_write(pcap, PCAP_REG_INT_SEL,
	476	(1 << PCAP_IRQ_ADCDONE2));
	477
	478	/* setup irq chip */
	479	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++) {
	480	set_irq_chip_and_handler(i, &pcap_irq_chip, handle_simple_irq);
	481	set_irq_chip_data(i, pcap);
	482	#ifdef CONFIG_ARM
	483	set_irq_flags(i, IRQF_VALID);
	484	#else
	485	set_irq_noprobe(i);
	486	#endif
	487	}
	488
	489	/* mask/ack all PCAP interrupts */
	490	ezx_pcap_write(pcap, PCAP_REG_MSR, PCAP_MASK_ALL_INTERRUPT);
	491	ezx_pcap_write(pcap, PCAP_REG_ISR, PCAP_CLEAR_INTERRUPT_REGISTER);
	492	pcap->msr = PCAP_MASK_ALL_INTERRUPT;
	493
	494	set_irq_type(spi->irq, IRQ_TYPE_EDGE_RISING);
	495	set_irq_data(spi->irq, pcap);
	496	set_irq_chained_handler(spi->irq, pcap_irq_handler);
	497	set_irq_wake(spi->irq, 1);
	498
	499	/* ADC */
	500	adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?
	501	PCAP_IRQ_ADCDONE2 : PCAP_IRQ_ADCDONE);
	502
	503	ret = request_irq(adc_irq, pcap_adc_irq, 0, "ADC", pcap);
	504	if (ret)
	505	goto free_irqchip;
	506
	507	/* setup subdevs */
	508	for (i = 0; i < pdata->num_subdevs; i++) {
	509	ret = pcap_add_subdev(pcap, &pdata->subdevs[i]);
	510	if (ret)
	511	goto remove_subdevs;
	512	}
	513
	514	/* board specific quirks */
	515	if (pdata->init)
	516	pdata->init(pcap);
	517
	518	return 0;
	519
	520	remove_subdevs:
	521	device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
	522	/* free_adc: */
	523	free_irq(adc_irq, pcap);
	524	free_irqchip:
	525	for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
	526	set_irq_chip_and_handler(i, NULL, NULL);
	527	/* destroy_workqueue: */
	528	destroy_workqueue(pcap->workqueue);
	529	free_pcap:
	530	kfree(pcap);
	531	ret:
	532	return ret;
533	}
534
535	static struct spi_driver ezxpcap_driver = {
536	.probe = ezx_pcap_probe,
537	.remove = __devexit_p(ezx_pcap_remove),
538	.driver = {
539	.name = "ezx-pcap",
540	.owner = THIS_MODULE,
541	},
542	};
543
544	static int __init ezx_pcap_init(void)
545	{
546	return spi_register_driver(&ezxpcap_driver);
547	}
548
549	static void __exit ezx_pcap_exit(void)
550	{
551	spi_unregister_driver(&ezxpcap_driver);
552	}
553
f078237b	554	subsys_initcall(ezx_pcap_init);
13a09f93 DR	555	module_exit(ezx_pcap_exit);
	556
	557	MODULE_LICENSE("GPL");
	558	MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
	559	MODULE_DESCRIPTION("Motorola PCAP2 ASIC Driver");
e0626e38	560	MODULE_ALIAS("spi:ezx-pcap");