linux/drivers/gpio/gpio-sch.c

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/*
* GPIO interface for Intel Poulsbo SCH
*
* Copyright (c) 2010 CompuLab Ltd
* Author: Denis Turischev <denis@compulab.co.il>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License 2 as published
* by the Free Software Foundation.
*
* 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/pci_ids.h>
#include <linux/gpio.h>
#define GEN 0x00
#define GIO 0x04
#define GLV 0x08
struct sch_gpio {
struct gpio_chip chip;
spinlock_t lock;
unsigned short iobase;
unsigned short core_base;
unsigned short resume_base;
};
static unsigned sch_gpio_offset(struct sch_gpio *sch, unsigned gpio,
unsigned reg)
{
unsigned base = 0;
if (gpio >= sch->resume_base) {
gpio -= sch->resume_base;
base += 0x20;
}
return base + reg + gpio / 8;
}
static unsigned sch_gpio_bit(struct sch_gpio *sch, unsigned gpio)
{
if (gpio >= sch->resume_base)
gpio -= sch->resume_base;
return gpio % 8;
}
static int sch_gpio_reg_get(struct sch_gpio *sch, unsigned gpio, unsigned reg)
{
unsigned short offset, bit;
u8 reg_val;
offset = sch_gpio_offset(sch, gpio, reg);
bit = sch_gpio_bit(sch, gpio);
reg_val = !!(inb(sch->iobase + offset) & BIT(bit));
return reg_val;
}
static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned gpio, unsigned reg,
int val)
{
unsigned short offset, bit;
u8 reg_val;
offset = sch_gpio_offset(sch, gpio, reg);
bit = sch_gpio_bit(sch, gpio);
reg_val = inb(sch->iobase + offset);
if (val)
outb(reg_val | BIT(bit), sch->iobase + offset);
else
outb((reg_val & ~BIT(bit)), sch->iobase + offset);
}
static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
spin_lock(&sch->lock);
sch_gpio_reg_set(sch, gpio_num, GIO, 1);
spin_unlock(&sch->lock);
return 0;
}
static int sch_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
return sch_gpio_reg_get(sch, gpio_num, GLV);
}
static void sch_gpio_set(struct gpio_chip *gc, unsigned gpio_num, int val)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
spin_lock(&sch->lock);
sch_gpio_reg_set(sch, gpio_num, GLV, val);
spin_unlock(&sch->lock);
}
static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned gpio_num,
int val)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
spin_lock(&sch->lock);
sch_gpio_reg_set(sch, gpio_num, GIO, 0);
spin_unlock(&sch->lock);
/*
* according to the datasheet, writing to the level register has no
* effect when GPIO is programmed as input.
* Actually the the level register is read-only when configured as input.
* Thus presetting the output level before switching to output is _NOT_ possible.
* Hence we set the level after configuring the GPIO as output.
* But we cannot prevent a short low pulse if direction is set to high
* and an external pull-up is connected.
*/
sch_gpio_set(gc, gpio_num, val);
return 0;
}
static const struct gpio_chip sch_gpio_chip = {
.label = "sch_gpio",
.owner = THIS_MODULE,
.direction_input = sch_gpio_direction_in,
.get = sch_gpio_get,
.direction_output = sch_gpio_direction_out,
.set = sch_gpio_set,
};
static int sch_gpio_probe(struct platform_device *pdev)
{
struct sch_gpio *sch;
struct resource *res;
sch = devm_kzalloc(&pdev->dev, sizeof(*sch), GFP_KERNEL);
if (!sch)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res)
return -EBUSY;
if (!devm_request_region(&pdev->dev, res->start, resource_size(res),
pdev->name))
return -EBUSY;
spin_lock_init(&sch->lock);
sch->iobase = res->start;
sch->chip = sch_gpio_chip;
sch->chip.label = dev_name(&pdev->dev);
gpio: change member .dev to .parent The name .dev in a struct is normally reserved for a struct device that is let us say a superclass to the thing described by the struct. struct gpio_chip stands out by confusingly using a struct device *dev to point to the parent device (such as a platform_device) that represents the hardware. As we want to give gpio_chip:s real devices, this is not working. We need to rename this member to parent. This was done by two coccinelle scripts, I guess it is possible to combine them into one, but I don't know such stuff. They look like this: @@ struct gpio_chip *var; @@ -var->dev +var->parent and: @@ struct gpio_chip var; @@ -var.dev +var.parent and: @@ struct bgpio_chip *var; @@ -var->gc.dev +var->gc.parent Plus a few instances of bgpio that I couldn't figure out how to teach Coccinelle to rewrite. This patch hits all over the place, but I *strongly* prefer this solution to any piecemal approaches that just exercise patch mechanics all over the place. It mainly hits drivers/gpio and drivers/pinctrl which is my own backyard anyway. Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Rafał Miłecki <zajec5@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Cc: Alek Du <alek.du@intel.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Jiri Kosina <jkosina@suse.cz> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-11-04 08:56:26 +00:00
sch->chip.parent = &pdev->dev;
switch (pdev->id) {
case PCI_DEVICE_ID_INTEL_SCH_LPC:
sch->core_base = 0;
sch->resume_base = 10;
sch->chip.ngpio = 14;
/*
* GPIO[6:0] enabled by default
* GPIO7 is configured by the CMC as SLPIOVR
* Enable GPIO[9:8] core powered gpios explicitly
*/
sch_gpio_reg_set(sch, 8, GEN, 1);
sch_gpio_reg_set(sch, 9, GEN, 1);
/*
* SUS_GPIO[2:0] enabled by default
* Enable SUS_GPIO3 resume powered gpio explicitly
*/
sch_gpio_reg_set(sch, 13, GEN, 1);
break;
case PCI_DEVICE_ID_INTEL_ITC_LPC:
sch->core_base = 0;
sch->resume_base = 5;
sch->chip.ngpio = 14;
break;
case PCI_DEVICE_ID_INTEL_CENTERTON_ILB:
sch->core_base = 0;
sch->resume_base = 21;
sch->chip.ngpio = 30;
break;
case PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB:
sch->core_base = 0;
sch->resume_base = 2;
sch->chip.ngpio = 8;
break;
default:
return -ENODEV;
}
platform_set_drvdata(pdev, sch);
return devm_gpiochip_add_data(&pdev->dev, &sch->chip, sch);
}
static struct platform_driver sch_gpio_driver = {
.driver = {
.name = "sch_gpio",
},
.probe = sch_gpio_probe,
};
module_platform_driver(sch_gpio_driver);
MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sch_gpio");