![Linus Torvalds](/assets/img/avatar_default.png)
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. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJZCusBAAoJEEEQszewGV1zengP/i3YgmSXJdaf26t/NxG3klU3 qx3akdQ3gEQ6BOlIY7Ew+b6qgMJynYNZa1trZgqTgLxPEKWjidyCgz+LHQ0OY+ir a7x6wr+gBj5WlgV+nBjVs4l6W8pVKCfnap/04OPEQDpxZOHs2LU5pqxxUZ9AxkKS urDFMDX55baFviQ+xAuHgamok87YoGP36A/e/fHIBepZmnochf0mCcPfIh0t8lRh s2x29PN5ZFRkl403RzjZfVCEMr9bMnSqmDquvPO++Kq0bL+3rOhuMErocd1Bg8ao LxBktkryujTaw699xK7Rq5SwcnOAPpaBY4NTmwsIJvAJuCh7qLy9JxQSBsSOT2bx 61NWUt5T/Xsi0ECYZM4YvsNpUP6XrpSTyG3c8T3fY9vXYLNKZBv1ht6OODpLeuke DxULAWP+DdzUS8a3qfKQvIJzSTloU31a1MBG58DWNJ072EQfa2YNaVE75VQk/z5/ 0xZbSHdPY/0Xgx8ltpKu37bSO676JiVQZZ1HEAuti4h21+USYueYD2L8/Bx4k9e/ 4UaOcw3MaCDHP/sf5hg17kQBjhhS0lV9Zv6H9QbHZUocJTJlIU+vXtgkQlrfi3n8 8j5m+ywVarmLtPqg1j2rqcw7LBCPe0qRXH3e5X/YmNMc3rH9bQz4cTo8ZSN9r8zS c17zGbbAqlGsBkpFAbQz =DGPb -----END PGP SIGNATURE----- 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 ...
425 lines
9.5 KiB
C
425 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");
|