linux/drivers/mfd/ezx-pcap.c

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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#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");