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linux-next/drivers/gpio/bt8xxgpio.c
Tejun Heo 5a0e3ad6af 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>
2010-03-30 22:02:32 +09:00

349 lines
8.3 KiB
C

/*
bt8xx GPIO abuser
Copyright (C) 2008 Michael Buesch <mb@bu3sch.de>
Please do _only_ contact the people listed _above_ with issues related to this driver.
All the other people listed below are not related to this driver. Their names
are only here, because this driver is derived from the bt848 driver.
Derived from the bt848 driver:
Copyright (C) 1996,97,98 Ralph Metzler
& Marcus Metzler
(c) 1999-2002 Gerd Knorr
some v4l2 code lines are taken from Justin's bttv2 driver which is
(c) 2000 Justin Schoeman
V4L1 removal from:
(c) 2005-2006 Nickolay V. Shmyrev
Fixes to be fully V4L2 compliant by
(c) 2006 Mauro Carvalho Chehab
Cropping and overscan support
Copyright (C) 2005, 2006 Michael H. Schimek
Sponsored by OPQ Systems AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/gpio.h>
#include <linux/slab.h>
/* Steal the hardware definitions from the bttv driver. */
#include "../media/video/bt8xx/bt848.h"
#define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */
struct bt8xxgpio {
spinlock_t lock;
void __iomem *mmio;
struct pci_dev *pdev;
struct gpio_chip gpio;
#ifdef CONFIG_PM
u32 saved_outen;
u32 saved_data;
#endif
};
#define bgwrite(dat, adr) writel((dat), bg->mmio+(adr))
#define bgread(adr) readl(bg->mmio+(adr))
static int modparam_gpiobase = -1/* dynamic */;
module_param_named(gpiobase, modparam_gpiobase, int, 0444);
MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
unsigned long flags;
u32 outen, data;
spin_lock_irqsave(&bg->lock, flags);
data = bgread(BT848_GPIO_DATA);
data &= ~(1 << nr);
bgwrite(data, BT848_GPIO_DATA);
outen = bgread(BT848_GPIO_OUT_EN);
outen &= ~(1 << nr);
bgwrite(outen, BT848_GPIO_OUT_EN);
spin_unlock_irqrestore(&bg->lock, flags);
return 0;
}
static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
{
struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
unsigned long flags;
u32 val;
spin_lock_irqsave(&bg->lock, flags);
val = bgread(BT848_GPIO_DATA);
spin_unlock_irqrestore(&bg->lock, flags);
return !!(val & (1 << nr));
}
static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio,
unsigned nr, int val)
{
struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
unsigned long flags;
u32 outen, data;
spin_lock_irqsave(&bg->lock, flags);
outen = bgread(BT848_GPIO_OUT_EN);
outen |= (1 << nr);
bgwrite(outen, BT848_GPIO_OUT_EN);
data = bgread(BT848_GPIO_DATA);
if (val)
data |= (1 << nr);
else
data &= ~(1 << nr);
bgwrite(data, BT848_GPIO_DATA);
spin_unlock_irqrestore(&bg->lock, flags);
return 0;
}
static void bt8xxgpio_gpio_set(struct gpio_chip *gpio,
unsigned nr, int val)
{
struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio);
unsigned long flags;
u32 data;
spin_lock_irqsave(&bg->lock, flags);
data = bgread(BT848_GPIO_DATA);
if (val)
data |= (1 << nr);
else
data &= ~(1 << nr);
bgwrite(data, BT848_GPIO_DATA);
spin_unlock_irqrestore(&bg->lock, flags);
}
static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg)
{
struct gpio_chip *c = &bg->gpio;
c->label = dev_name(&bg->pdev->dev);
c->owner = THIS_MODULE;
c->direction_input = bt8xxgpio_gpio_direction_input;
c->get = bt8xxgpio_gpio_get;
c->direction_output = bt8xxgpio_gpio_direction_output;
c->set = bt8xxgpio_gpio_set;
c->dbg_show = NULL;
c->base = modparam_gpiobase;
c->ngpio = BT8XXGPIO_NR_GPIOS;
c->can_sleep = 0;
}
static int bt8xxgpio_probe(struct pci_dev *dev,
const struct pci_device_id *pci_id)
{
struct bt8xxgpio *bg;
int err;
bg = kzalloc(sizeof(*bg), GFP_KERNEL);
if (!bg)
return -ENOMEM;
bg->pdev = dev;
spin_lock_init(&bg->lock);
err = pci_enable_device(dev);
if (err) {
printk(KERN_ERR "bt8xxgpio: Can't enable device.\n");
goto err_freebg;
}
if (!request_mem_region(pci_resource_start(dev, 0),
pci_resource_len(dev, 0),
"bt8xxgpio")) {
printk(KERN_WARNING "bt8xxgpio: Can't request iomem (0x%llx).\n",
(unsigned long long)pci_resource_start(dev, 0));
err = -EBUSY;
goto err_disable;
}
pci_set_master(dev);
pci_set_drvdata(dev, bg);
bg->mmio = ioremap(pci_resource_start(dev, 0), 0x1000);
if (!bg->mmio) {
printk(KERN_ERR "bt8xxgpio: ioremap() failed\n");
err = -EIO;
goto err_release_mem;
}
/* Disable interrupts */
bgwrite(0, BT848_INT_MASK);
/* gpio init */
bgwrite(0, BT848_GPIO_DMA_CTL);
bgwrite(0, BT848_GPIO_REG_INP);
bgwrite(0, BT848_GPIO_OUT_EN);
bt8xxgpio_gpio_setup(bg);
err = gpiochip_add(&bg->gpio);
if (err) {
printk(KERN_ERR "bt8xxgpio: Failed to register GPIOs\n");
goto err_release_mem;
}
printk(KERN_INFO "bt8xxgpio: Abusing BT8xx card for GPIOs %d to %d\n",
bg->gpio.base, bg->gpio.base + BT8XXGPIO_NR_GPIOS - 1);
return 0;
err_release_mem:
release_mem_region(pci_resource_start(dev, 0),
pci_resource_len(dev, 0));
pci_set_drvdata(dev, NULL);
err_disable:
pci_disable_device(dev);
err_freebg:
kfree(bg);
return err;
}
static void bt8xxgpio_remove(struct pci_dev *pdev)
{
struct bt8xxgpio *bg = pci_get_drvdata(pdev);
gpiochip_remove(&bg->gpio);
bgwrite(0, BT848_INT_MASK);
bgwrite(~0x0, BT848_INT_STAT);
bgwrite(0x0, BT848_GPIO_OUT_EN);
iounmap(bg->mmio);
release_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
kfree(bg);
}
#ifdef CONFIG_PM
static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct bt8xxgpio *bg = pci_get_drvdata(pdev);
unsigned long flags;
spin_lock_irqsave(&bg->lock, flags);
bg->saved_outen = bgread(BT848_GPIO_OUT_EN);
bg->saved_data = bgread(BT848_GPIO_DATA);
bgwrite(0, BT848_INT_MASK);
bgwrite(~0x0, BT848_INT_STAT);
bgwrite(0x0, BT848_GPIO_OUT_EN);
spin_unlock_irqrestore(&bg->lock, flags);
pci_save_state(pdev);
pci_disable_device(pdev);
pci_set_power_state(pdev, pci_choose_state(pdev, state));
return 0;
}
static int bt8xxgpio_resume(struct pci_dev *pdev)
{
struct bt8xxgpio *bg = pci_get_drvdata(pdev);
unsigned long flags;
int err;
pci_set_power_state(pdev, 0);
err = pci_enable_device(pdev);
if (err)
return err;
pci_restore_state(pdev);
spin_lock_irqsave(&bg->lock, flags);
bgwrite(0, BT848_INT_MASK);
bgwrite(0, BT848_GPIO_DMA_CTL);
bgwrite(0, BT848_GPIO_REG_INP);
bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN);
bgwrite(bg->saved_data & bg->saved_outen,
BT848_GPIO_DATA);
spin_unlock_irqrestore(&bg->lock, flags);
return 0;
}
#else
#define bt8xxgpio_suspend NULL
#define bt8xxgpio_resume NULL
#endif /* CONFIG_PM */
static struct pci_device_id bt8xxgpio_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl);
static struct pci_driver bt8xxgpio_pci_driver = {
.name = "bt8xxgpio",
.id_table = bt8xxgpio_pci_tbl,
.probe = bt8xxgpio_probe,
.remove = bt8xxgpio_remove,
.suspend = bt8xxgpio_suspend,
.resume = bt8xxgpio_resume,
};
static int __init bt8xxgpio_init(void)
{
return pci_register_driver(&bt8xxgpio_pci_driver);
}
module_init(bt8xxgpio_init)
static void __exit bt8xxgpio_exit(void)
{
pci_unregister_driver(&bt8xxgpio_pci_driver);
}
module_exit(bt8xxgpio_exit)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Buesch");
MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");