Release 4.12 drivers/gpio/gpio-sch.c
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 51 | 100.00% | 1 | 100.00% |
| Total | 51 | 100.00% | 1 | 100.00% |
static unsigned sch_gpio_bit(struct sch_gpio *sch, unsigned gpio)
{
if (gpio >= sch->resume_base)
gpio -= sch->resume_base;
return gpio % 8;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 33 | 100.00% | 1 | 100.00% |
| Total | 33 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 47 | 68.12% | 1 | 25.00% |
| Chang Rebecca Swee Fun | 16 | 23.19% | 1 | 25.00% |
| Denis Turischev | 4 | 5.80% | 1 | 25.00% |
| Colin Pitrat | 2 | 2.90% | 1 | 25.00% |
| Total | 69 | 100.00% | 4 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Denis Turischev | 44 | 44.00% | 1 | 25.00% |
| Chang Rebecca Swee Fun | 35 | 35.00% | 1 | 25.00% |
| Mika Westerberg | 19 | 19.00% | 1 | 25.00% |
| Colin Pitrat | 2 | 2.00% | 1 | 25.00% |
| Total | 100 | 100.00% | 4 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Denis Turischev | 19 | 35.19% | 1 | 20.00% |
| Mika Westerberg | 17 | 31.48% | 1 | 20.00% |
| Chang Rebecca Swee Fun | 16 | 29.63% | 1 | 20.00% |
| Colin Pitrat | 1 | 1.85% | 1 | 20.00% |
| Linus Walleij | 1 | 1.85% | 1 | 20.00% |
| Total | 54 | 100.00% | 5 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Chang Rebecca Swee Fun | 21 | 61.76% | 1 | 33.33% |
| Colin Pitrat | 11 | 32.35% | 1 | 33.33% |
| Denis Turischev | 2 | 5.88% | 1 | 33.33% |
| Total | 34 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Denis Turischev | 30 | 55.56% | 1 | 20.00% |
| Mika Westerberg | 21 | 38.89% | 1 | 20.00% |
| Chang Rebecca Swee Fun | 1 | 1.85% | 1 | 20.00% |
| Linus Walleij | 1 | 1.85% | 1 | 20.00% |
| Colin Pitrat | 1 | 1.85% | 1 | 20.00% |
| Total | 54 | 100.00% | 5 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Denis Turischev | 33 | 49.25% | 1 | 16.67% |
| Mika Westerberg | 21 | 31.34% | 1 | 16.67% |
| Daniel Krueger | 9 | 13.43% | 1 | 16.67% |
| Chang Rebecca Swee Fun | 2 | 2.99% | 1 | 16.67% |
| Colin Pitrat | 1 | 1.49% | 1 | 16.67% |
| Linus Walleij | 1 | 1.49% | 1 | 16.67% |
| Total | 67 | 100.00% | 6 | 100.00% |
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);
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Denis Turischev | 130 | 41.94% | 2 | 20.00% |
| Mika Westerberg | 118 | 38.06% | 1 | 10.00% |
| Chang Rebecca Swee Fun | 39 | 12.58% | 2 | 20.00% |
| Seth Heasley | 14 | 4.52% | 1 | 10.00% |
| Laxman Dewangan | 5 | 1.61% | 1 | 10.00% |
| Laurent Navet | 2 | 0.65% | 1 | 10.00% |
| Linus Walleij | 2 | 0.65% | 2 | 20.00% |
| Total | 310 | 100.00% | 10 | 100.00% |
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");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Denis Turischev | 371 | 40.28% | 2 | 13.33% |
| Mika Westerberg | 363 | 39.41% | 1 | 6.67% |
| Chang Rebecca Swee Fun | 130 | 14.12% | 2 | 13.33% |
| Colin Pitrat | 18 | 1.95% | 1 | 6.67% |
| Seth Heasley | 14 | 1.52% | 1 | 6.67% |
| Daniel Krueger | 9 | 0.98% | 1 | 6.67% |
| Linus Walleij | 5 | 0.54% | 2 | 13.33% |
| Laxman Dewangan | 5 | 0.54% | 1 | 6.67% |
| Laurent Navet | 2 | 0.22% | 1 | 6.67% |
| Mark Brown | 2 | 0.22% | 1 | 6.67% |
| Julia Lawall | 1 | 0.11% | 1 | 6.67% |
| Grant C. Likely | 1 | 0.11% | 1 | 6.67% |
| Total | 921 | 100.00% | 15 | 100.00% |
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