mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
e35b5ab0a7
These structures are only used to copy into other structures, so declare them as const. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r disable optional_qualifier@ identifier i; position p; @@ static struct gpio_chip i@p = { ... }; @ok@ identifier r.i; expression e; position p; @@ e = i@p; @bad@ position p != {r.p,ok.p}; identifier r.i; struct gpio_chip e; @@ e@i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct gpio_chip i = { ... }; // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
317 lines
7.6 KiB
C
317 lines
7.6 KiB
C
/*
|
|
* gpiolib support for Wolfson WM831x PMICs
|
|
*
|
|
* Copyright 2009 Wolfson Microelectronics PLC.
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/mfd/wm831x/core.h>
|
|
#include <linux/mfd/wm831x/pdata.h>
|
|
#include <linux/mfd/wm831x/gpio.h>
|
|
#include <linux/mfd/wm831x/irq.h>
|
|
|
|
struct wm831x_gpio {
|
|
struct wm831x *wm831x;
|
|
struct gpio_chip gpio_chip;
|
|
};
|
|
|
|
static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
int val = WM831X_GPN_DIR;
|
|
|
|
if (wm831x->has_gpio_ena)
|
|
val |= WM831X_GPN_TRI;
|
|
|
|
return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
|
|
WM831X_GPN_DIR | WM831X_GPN_TRI |
|
|
WM831X_GPN_FN_MASK, val);
|
|
}
|
|
|
|
static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
int ret;
|
|
|
|
ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ret & 1 << offset)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
|
|
wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
|
|
value << offset);
|
|
}
|
|
|
|
static int wm831x_gpio_direction_out(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
int val = 0;
|
|
int ret;
|
|
|
|
if (wm831x->has_gpio_ena)
|
|
val |= WM831X_GPN_TRI;
|
|
|
|
ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
|
|
WM831X_GPN_DIR | WM831X_GPN_TRI |
|
|
WM831X_GPN_FN_MASK, val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Can only set GPIO state once it's in output mode */
|
|
wm831x_gpio_set(chip, offset, value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
|
|
return irq_create_mapping(wm831x->irq_domain,
|
|
WM831X_IRQ_GPIO_1 + offset);
|
|
}
|
|
|
|
static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
|
|
unsigned debounce)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
int reg = WM831X_GPIO1_CONTROL + offset;
|
|
int ret, fn;
|
|
|
|
ret = wm831x_reg_read(wm831x, reg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (ret & WM831X_GPN_FN_MASK) {
|
|
case 0:
|
|
case 1:
|
|
break;
|
|
default:
|
|
/* Not in GPIO mode */
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (debounce >= 32 && debounce <= 64)
|
|
fn = 0;
|
|
else if (debounce >= 4000 && debounce <= 8000)
|
|
fn = 1;
|
|
else
|
|
return -EINVAL;
|
|
|
|
return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);
|
|
}
|
|
|
|
static int wm831x_set_single_ended(struct gpio_chip *chip,
|
|
unsigned int offset,
|
|
enum single_ended_mode mode)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
int reg = WM831X_GPIO1_CONTROL + offset;
|
|
|
|
switch (mode) {
|
|
case LINE_MODE_OPEN_DRAIN:
|
|
return wm831x_set_bits(wm831x, reg,
|
|
WM831X_GPN_OD_MASK, WM831X_GPN_OD);
|
|
case LINE_MODE_PUSH_PULL:
|
|
return wm831x_set_bits(wm831x, reg,
|
|
WM831X_GPN_OD_MASK, 0);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
|
|
{
|
|
struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
|
|
struct wm831x *wm831x = wm831x_gpio->wm831x;
|
|
int i, tristated;
|
|
|
|
for (i = 0; i < chip->ngpio; i++) {
|
|
int gpio = i + chip->base;
|
|
int reg;
|
|
const char *label, *pull, *powerdomain;
|
|
|
|
/* We report the GPIO even if it's not requested since
|
|
* we're also reporting things like alternate
|
|
* functions which apply even when the GPIO is not in
|
|
* use as a GPIO.
|
|
*/
|
|
label = gpiochip_is_requested(chip, i);
|
|
if (!label)
|
|
label = "Unrequested";
|
|
|
|
seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
|
|
|
|
reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
|
|
if (reg < 0) {
|
|
dev_err(wm831x->dev,
|
|
"GPIO control %d read failed: %d\n",
|
|
gpio, reg);
|
|
seq_printf(s, "\n");
|
|
continue;
|
|
}
|
|
|
|
switch (reg & WM831X_GPN_PULL_MASK) {
|
|
case WM831X_GPIO_PULL_NONE:
|
|
pull = "nopull";
|
|
break;
|
|
case WM831X_GPIO_PULL_DOWN:
|
|
pull = "pulldown";
|
|
break;
|
|
case WM831X_GPIO_PULL_UP:
|
|
pull = "pullup";
|
|
break;
|
|
default:
|
|
pull = "INVALID PULL";
|
|
break;
|
|
}
|
|
|
|
switch (i + 1) {
|
|
case 1 ... 3:
|
|
case 7 ... 9:
|
|
if (reg & WM831X_GPN_PWR_DOM)
|
|
powerdomain = "VPMIC";
|
|
else
|
|
powerdomain = "DBVDD";
|
|
break;
|
|
|
|
case 4 ... 6:
|
|
case 10 ... 12:
|
|
if (reg & WM831X_GPN_PWR_DOM)
|
|
powerdomain = "SYSVDD";
|
|
else
|
|
powerdomain = "DBVDD";
|
|
break;
|
|
|
|
case 13 ... 16:
|
|
powerdomain = "TPVDD";
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
tristated = reg & WM831X_GPN_TRI;
|
|
if (wm831x->has_gpio_ena)
|
|
tristated = !tristated;
|
|
|
|
seq_printf(s, " %s %s %s %s%s\n"
|
|
" %s%s (0x%4x)\n",
|
|
reg & WM831X_GPN_DIR ? "in" : "out",
|
|
wm831x_gpio_get(chip, i) ? "high" : "low",
|
|
pull,
|
|
powerdomain,
|
|
reg & WM831X_GPN_POL ? "" : " inverted",
|
|
reg & WM831X_GPN_OD ? "open-drain" : "push-pull",
|
|
tristated ? " tristated" : "",
|
|
reg);
|
|
}
|
|
}
|
|
#else
|
|
#define wm831x_gpio_dbg_show NULL
|
|
#endif
|
|
|
|
static const struct gpio_chip template_chip = {
|
|
.label = "wm831x",
|
|
.owner = THIS_MODULE,
|
|
.direction_input = wm831x_gpio_direction_in,
|
|
.get = wm831x_gpio_get,
|
|
.direction_output = wm831x_gpio_direction_out,
|
|
.set = wm831x_gpio_set,
|
|
.to_irq = wm831x_gpio_to_irq,
|
|
.set_debounce = wm831x_gpio_set_debounce,
|
|
.set_single_ended = wm831x_set_single_ended,
|
|
.dbg_show = wm831x_gpio_dbg_show,
|
|
.can_sleep = true,
|
|
};
|
|
|
|
static int wm831x_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
|
|
struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
|
|
struct wm831x_gpio *wm831x_gpio;
|
|
int ret;
|
|
|
|
wm831x_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm831x_gpio),
|
|
GFP_KERNEL);
|
|
if (wm831x_gpio == NULL)
|
|
return -ENOMEM;
|
|
|
|
wm831x_gpio->wm831x = wm831x;
|
|
wm831x_gpio->gpio_chip = template_chip;
|
|
wm831x_gpio->gpio_chip.ngpio = wm831x->num_gpio;
|
|
wm831x_gpio->gpio_chip.parent = &pdev->dev;
|
|
if (pdata && pdata->gpio_base)
|
|
wm831x_gpio->gpio_chip.base = pdata->gpio_base;
|
|
else
|
|
wm831x_gpio->gpio_chip.base = -1;
|
|
|
|
ret = devm_gpiochip_add_data(&pdev->dev, &wm831x_gpio->gpio_chip,
|
|
wm831x_gpio);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, wm831x_gpio);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver wm831x_gpio_driver = {
|
|
.driver.name = "wm831x-gpio",
|
|
.probe = wm831x_gpio_probe,
|
|
};
|
|
|
|
static int __init wm831x_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&wm831x_gpio_driver);
|
|
}
|
|
subsys_initcall(wm831x_gpio_init);
|
|
|
|
static void __exit wm831x_gpio_exit(void)
|
|
{
|
|
platform_driver_unregister(&wm831x_gpio_driver);
|
|
}
|
|
module_exit(wm831x_gpio_exit);
|
|
|
|
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|
|
MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:wm831x-gpio");
|