linux-stable/drivers/gpio/gpio-mockup.c
Linus Torvalds 2bd8040174 This is the bulk of GPIO changes for the v4.12 kernel cycle:
Core changes
 
 - Return NULL from gpiod_get_optional() when GPIOLIB is disabled.
   This was a much discussed change. It affects use cases where people
   write drivers that might or might not be using GPIO resources.
   I have decided that this is the lesser evil right now.
 
 - Make gpiod_count() behave consistently across different hardware
   descriptions.
 
 - Fix the syntax around open drain/open source to not infer active
   high/low semantics.
 
 New drivers
 
 - A new single-register fixed-direction framework driver for hardware
   that have lines controlled by a single register that just work in
   one direction (out or in), including IRQ support.
 
 - Support the Fintek F71889A GPIO SuperIO controller.
 
 - Support the National NI 169445 MMIO GPIO.
 
 - Support for the X-Gene derivative of the DWC GPIO controller
 
 - Support for the Rohm BD9571MWV-M PMIC GPIO controller.
 
 - Refactor the Gemini GPIO driver to a generic Faraday FTGPIO driver
   and replace both the Gemini and the Moxa ART custom drivers with
   this driver.
 
 Driver improvements
 
 - A whole slew of drivers have their spinlocks chaned to raw spinlocks
   as they provide irqchips, and thus we are progressing on realtime
   compliance.
 
 - Use devm_irq_alloc_descs() in a slew of drivers, getting managed
   resources.
 
 - Support for the embedded PWM controller inside the MVEBU driver.
 
 - Debounce, open source and open drain support for the Aspeed driver.
 
 - Misc smaller fixes like spelling and syntax and whatnot.
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Merge tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v4.12 kernel cycle.

  Core changes:

   - Return NULL from gpiod_get_optional() when GPIOLIB is disabled.
     This was a much discussed change. It affects use cases where people
     write drivers that might or might not be using GPIO resources. I
     have decided that this is the lesser evil right now.

   - Make gpiod_count() behave consistently across different hardware
     descriptions.

   - Fix the syntax around open drain/open source to not infer active
     high/low semantics.

  New drivers:

   - A new single-register fixed-direction framework driver for hardware
     that have lines controlled by a single register that just work in
     one direction (out or in), including IRQ support.

   - Support the Fintek F71889A GPIO SuperIO controller.

   - Support the National NI 169445 MMIO GPIO.

   - Support for the X-Gene derivative of the DWC GPIO controller

   - Support for the Rohm BD9571MWV-M PMIC GPIO controller.

   - Refactor the Gemini GPIO driver to a generic Faraday FTGPIO driver
     and replace both the Gemini and the Moxa ART custom drivers with
     this driver.

  Driver improvements:

   - A whole slew of drivers have their spinlocks chaned to raw
     spinlocks as they provide irqchips, and thus we are progressing on
     realtime compliance.

   - Use devm_irq_alloc_descs() in a slew of drivers, getting managed
     resources.

   - Support for the embedded PWM controller inside the MVEBU driver.

   - Debounce, open source and open drain support for the Aspeed driver.

   - Misc smaller fixes like spelling and syntax and whatnot"

* tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (77 commits)
  gpio: f7188x: Add a missing break
  gpio: omap: return error if requested debounce time is not possible
  gpio: Add ROHM BD9571MWV-M PMIC GPIO driver
  gpio: gpio-wcove: fix GPIO IRQ status mask
  gpio: DT bindings, move tca9554 from pcf857x to pca953x
  gpio: move tca9554 from pcf857x to pca953x
  gpio: arizona: Correct check whether the pin is an input
  gpio: Add XRA1403 DTS binding documentation
  dt-bindings: add exar to vendor prefixes list
  gpio: gpio-wcove: fix irq pending status bit width
  gpio: dwapb: use dwapb_read instead of readl_relaxed
  gpio: aspeed: Add open-source and open-drain support
  gpio: aspeed: Add debounce support
  gpio: aspeed: dt: Add optional clocks property
  gpio: aspeed: dt: Fix description alignment in bindings document
  gpio: mvebu: Add limited PWM support
  gpio: Use unsigned int for interrupt numbers
  gpio: f7188x: Add F71889A GPIO support.
  gpio: core: Decouple open drain/source flag with active low/high
  gpio: arizona: Correct handling for reading input GPIOs
  ...
2017-05-04 12:05:32 -07:00

424 lines
9.5 KiB
C

/*
* GPIO Testing Device Driver
*
* Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com>
* Copyright (C) 2015-2016 Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
*
* 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/init.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irq_work.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include "gpiolib.h"
#define GPIO_MOCKUP_NAME "gpio-mockup"
#define GPIO_MOCKUP_MAX_GC 10
enum {
DIR_IN = 0,
DIR_OUT,
};
/*
* struct gpio_pin_status - structure describing a GPIO status
* @dir: Configures direction of gpio as "in" or "out", 0=in, 1=out
* @value: Configures status of the gpio as 0(low) or 1(high)
*/
struct gpio_mockup_line_status {
int dir;
bool value;
};
struct gpio_mockup_irq_context {
struct irq_work work;
int irq;
};
struct gpio_mockup_chip {
struct gpio_chip gc;
struct gpio_mockup_line_status *lines;
struct gpio_mockup_irq_context irq_ctx;
struct dentry *dbg_dir;
};
struct gpio_mockup_dbgfs_private {
struct gpio_mockup_chip *chip;
struct gpio_desc *desc;
int offset;
};
static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1];
static int gpio_mockup_params_nr;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
static bool gpio_mockup_named_lines;
module_param_named(gpio_mockup_named_lines,
gpio_mockup_named_lines, bool, 0400);
static const char gpio_mockup_name_start = 'A';
static struct dentry *gpio_mockup_dbg_dir;
static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
return chip->lines[offset].value;
}
static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
chip->lines[offset].value = !!value;
}
static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
gpio_mockup_set(gc, offset, value);
chip->lines[offset].dir = DIR_OUT;
return 0;
}
static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
chip->lines[offset].dir = DIR_IN;
return 0;
}
static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
return chip->lines[offset].dir;
}
static int gpio_mockup_name_lines(struct device *dev,
struct gpio_mockup_chip *chip)
{
struct gpio_chip *gc = &chip->gc;
char **names;
int i;
names = devm_kzalloc(dev, sizeof(char *) * gc->ngpio, GFP_KERNEL);
if (!names)
return -ENOMEM;
for (i = 0; i < gc->ngpio; i++) {
names[i] = devm_kasprintf(dev, GFP_KERNEL,
"%s-%d", gc->label, i);
if (!names[i])
return -ENOMEM;
}
gc->names = (const char *const *)names;
return 0;
}
static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset)
{
return chip->irq_base + offset;
}
/*
* While we should generally support irqmask and irqunmask, this driver is
* for testing purposes only so we don't care.
*/
static void gpio_mockup_irqmask(struct irq_data *d) { }
static void gpio_mockup_irqunmask(struct irq_data *d) { }
static struct irq_chip gpio_mockup_irqchip = {
.name = GPIO_MOCKUP_NAME,
.irq_mask = gpio_mockup_irqmask,
.irq_unmask = gpio_mockup_irqunmask,
};
static void gpio_mockup_handle_irq(struct irq_work *work)
{
struct gpio_mockup_irq_context *irq_ctx;
irq_ctx = container_of(work, struct gpio_mockup_irq_context, work);
handle_simple_irq(irq_to_desc(irq_ctx->irq));
}
static int gpio_mockup_irqchip_setup(struct device *dev,
struct gpio_mockup_chip *chip)
{
struct gpio_chip *gc = &chip->gc;
int irq_base, i;
irq_base = devm_irq_alloc_descs(dev, -1, 0, gc->ngpio, 0);
if (irq_base < 0)
return irq_base;
gc->irq_base = irq_base;
gc->irqchip = &gpio_mockup_irqchip;
for (i = 0; i < gc->ngpio; i++) {
irq_set_chip(irq_base + i, gc->irqchip);
irq_set_handler(irq_base + i, &handle_simple_irq);
irq_modify_status(irq_base + i,
IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
}
init_irq_work(&chip->irq_ctx.work, gpio_mockup_handle_irq);
return 0;
}
static ssize_t gpio_mockup_event_write(struct file *file,
const char __user *usr_buf,
size_t size, loff_t *ppos)
{
struct gpio_mockup_dbgfs_private *priv;
struct gpio_mockup_chip *chip;
struct seq_file *sfile;
struct gpio_desc *desc;
struct gpio_chip *gc;
int val;
char buf;
sfile = file->private_data;
priv = sfile->private;
desc = priv->desc;
chip = priv->chip;
gc = &chip->gc;
if (copy_from_user(&buf, usr_buf, 1))
return -EFAULT;
if (buf == '0')
val = 0;
else if (buf == '1')
val = 1;
else
return -EINVAL;
gpiod_set_value_cansleep(desc, val);
priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
irq_work_queue(&priv->chip->irq_ctx.work);
return size;
}
static int gpio_mockup_event_open(struct inode *inode, struct file *file)
{
return single_open(file, NULL, inode->i_private);
}
static const struct file_operations gpio_mockup_event_ops = {
.owner = THIS_MODULE,
.open = gpio_mockup_event_open,
.write = gpio_mockup_event_write,
.llseek = no_llseek,
};
static void gpio_mockup_debugfs_setup(struct device *dev,
struct gpio_mockup_chip *chip)
{
struct gpio_mockup_dbgfs_private *priv;
struct dentry *evfile;
struct gpio_chip *gc;
char *name;
int i;
gc = &chip->gc;
chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
if (!chip->dbg_dir)
goto err;
for (i = 0; i < gc->ngpio; i++) {
name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
if (!name)
goto err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
goto err;
priv->chip = chip;
priv->offset = i;
priv->desc = &gc->gpiodev->descs[i];
evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
&gpio_mockup_event_ops);
if (!evfile)
goto err;
}
return;
err:
dev_err(dev, "error creating debugfs directory\n");
}
static int gpio_mockup_add(struct device *dev,
struct gpio_mockup_chip *chip,
const char *name, int base, int ngpio)
{
struct gpio_chip *gc = &chip->gc;
int ret;
gc->base = base;
gc->ngpio = ngpio;
gc->label = name;
gc->owner = THIS_MODULE;
gc->parent = dev;
gc->get = gpio_mockup_get;
gc->set = gpio_mockup_set;
gc->direction_output = gpio_mockup_dirout;
gc->direction_input = gpio_mockup_dirin;
gc->get_direction = gpio_mockup_get_direction;
gc->to_irq = gpio_mockup_to_irq;
chip->lines = devm_kzalloc(dev, sizeof(*chip->lines) * gc->ngpio,
GFP_KERNEL);
if (!chip->lines)
return -ENOMEM;
if (gpio_mockup_named_lines) {
ret = gpio_mockup_name_lines(dev, chip);
if (ret)
return ret;
}
ret = gpio_mockup_irqchip_setup(dev, chip);
if (ret)
return ret;
ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
if (ret)
return ret;
if (gpio_mockup_dbg_dir)
gpio_mockup_debugfs_setup(dev, chip);
return 0;
}
static int gpio_mockup_probe(struct platform_device *pdev)
{
struct gpio_mockup_chip *chips;
struct device *dev = &pdev->dev;
int ret, i, base, ngpio;
char *chip_name;
if (gpio_mockup_params_nr < 2)
return -EINVAL;
chips = devm_kzalloc(dev,
sizeof(*chips) * (gpio_mockup_params_nr >> 1),
GFP_KERNEL);
if (!chips)
return -ENOMEM;
platform_set_drvdata(pdev, chips);
for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
base = gpio_mockup_ranges[i * 2];
if (base == -1)
ngpio = gpio_mockup_ranges[i * 2 + 1];
else
ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
if (ngpio >= 0) {
chip_name = devm_kasprintf(dev, GFP_KERNEL,
"%s-%c", GPIO_MOCKUP_NAME,
gpio_mockup_name_start + i);
if (!chip_name)
return -ENOMEM;
ret = gpio_mockup_add(dev, &chips[i],
chip_name, base, ngpio);
} else {
ret = -1;
}
if (ret) {
dev_err(dev, "gpio<%d..%d> add failed\n",
base, base < 0 ? ngpio : base + ngpio);
return ret;
}
dev_info(dev, "gpio<%d..%d> add successful!",
base, base + ngpio);
}
return 0;
}
static struct platform_driver gpio_mockup_driver = {
.driver = {
.name = GPIO_MOCKUP_NAME,
},
.probe = gpio_mockup_probe,
};
static struct platform_device *pdev;
static int __init mock_device_init(void)
{
int err;
gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
if (!gpio_mockup_dbg_dir)
pr_err("%s: error creating debugfs directory\n",
GPIO_MOCKUP_NAME);
pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1);
if (!pdev)
return -ENOMEM;
err = platform_device_add(pdev);
if (err) {
platform_device_put(pdev);
return err;
}
err = platform_driver_register(&gpio_mockup_driver);
if (err) {
platform_device_unregister(pdev);
return err;
}
return 0;
}
static void __exit mock_device_exit(void)
{
debugfs_remove_recursive(gpio_mockup_dbg_dir);
platform_driver_unregister(&gpio_mockup_driver);
platform_device_unregister(pdev);
}
module_init(mock_device_init);
module_exit(mock_device_exit);
MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
MODULE_DESCRIPTION("GPIO Testing driver");
MODULE_LICENSE("GPL v2");