mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
535 lines
12 KiB
C
535 lines
12 KiB
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(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");
|