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path: root/drivers/gpio/gpio-mockup.c
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Diffstat (limited to 'drivers/gpio/gpio-mockup.c')
-rw-r--r--drivers/gpio/gpio-mockup.c377
1 files changed, 301 insertions, 76 deletions
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 1ef85b0c2b1f..06dac72cb69c 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -14,14 +14,23 @@
#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>
-#define GPIO_NAME "gpio-mockup"
-#define MAX_GC 10
+#include "gpiolib.h"
-enum direction {
- OUT,
- IN
+#define GPIO_MOCKUP_NAME "gpio-mockup"
+#define GPIO_MOCKUP_MAX_GC 10
+
+enum {
+ DIR_IN = 0,
+ DIR_OUT,
};
/*
@@ -29,150 +38,360 @@ enum direction {
* @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_pin_status {
- enum direction dir;
+struct gpio_mockup_line_status {
+ int dir;
bool value;
};
-struct mockup_gpio_controller {
+struct gpio_mockup_irq_context {
+ struct irq_work work;
+ int irq;
+};
+
+struct gpio_mockup_chip {
struct gpio_chip gc;
- struct gpio_pin_status *stats;
+ struct gpio_mockup_line_status *lines;
+ struct gpio_mockup_irq_context irq_ctx;
+ struct dentry *dbg_dir;
};
-static int gpio_mockup_ranges[MAX_GC << 1];
+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);
-const char pins_name_start = 'A';
+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 mockup_gpio_get(struct gpio_chip *gc, unsigned int offset)
+static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
{
- struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+ struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
- return cntr->stats[offset].value;
+ return chip->lines[offset].value;
}
-static void mockup_gpio_set(struct gpio_chip *gc, unsigned int offset,
+static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
- struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+ struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
- cntr->stats[offset].value = !!value;
+ chip->lines[offset].value = !!value;
}
-static int mockup_gpio_dirout(struct gpio_chip *gc, unsigned int offset,
+static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
int value)
{
- struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+ 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;
- mockup_gpio_set(gc, offset, value);
- cntr->stats[offset].dir = OUT;
return 0;
}
-static int mockup_gpio_dirin(struct gpio_chip *gc, unsigned int offset)
+static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset)
{
- struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+ 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 = irq_alloc_descs(-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);
- cntr->stats[offset].dir = IN;
return 0;
}
-static int mockup_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+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 status, val;
+ char buf;
+
+ sfile = file->private_data;
+ priv = sfile->private;
+ desc = priv->desc;
+ chip = priv->chip;
+ gc = &chip->gc;
+
+ status = copy_from_user(&buf, usr_buf, 1);
+ if (status)
+ return status;
+
+ 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 mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+ struct gpio_mockup_dbgfs_private *priv;
+ struct dentry *evfile;
+ struct gpio_chip *gc;
+ char *name;
+ int i;
+
+ gc = &chip->gc;
- return cntr->stats[offset].dir;
+ 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 mockup_gpio_add(struct device *dev,
- struct mockup_gpio_controller *cntr,
+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;
- cntr->gc.base = base;
- cntr->gc.ngpio = ngpio;
- cntr->gc.label = name;
- cntr->gc.owner = THIS_MODULE;
- cntr->gc.parent = dev;
- cntr->gc.get = mockup_gpio_get;
- cntr->gc.set = mockup_gpio_set;
- cntr->gc.direction_output = mockup_gpio_dirout;
- cntr->gc.direction_input = mockup_gpio_dirin;
- cntr->gc.get_direction = mockup_gpio_get_direction;
- cntr->stats = devm_kzalloc(dev, sizeof(*cntr->stats) * cntr->gc.ngpio,
+ 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 (!cntr->stats) {
- ret = -ENOMEM;
- goto err;
+ if (!chip->lines)
+ return -ENOMEM;
+
+ if (gpio_mockup_named_lines) {
+ ret = gpio_mockup_name_lines(dev, chip);
+ if (ret)
+ return ret;
}
- ret = devm_gpiochip_add_data(dev, &cntr->gc, cntr);
+
+ ret = gpio_mockup_irqchip_setup(dev, chip);
if (ret)
- goto err;
+ 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);
- dev_info(dev, "gpio<%d..%d> add successful!", base, base + ngpio);
return 0;
-err:
- dev_err(dev, "gpio<%d..%d> add failed!", base, base + ngpio);
- return ret;
}
-static int mockup_gpio_probe(struct platform_device *pdev)
+static int gpio_mockup_probe(struct platform_device *pdev)
{
+ struct gpio_mockup_chip *chips;
struct device *dev = &pdev->dev;
- struct mockup_gpio_controller *cntr;
- int ret;
- int i;
- int base;
- int ngpio;
- char chip_name[sizeof(GPIO_NAME) + 3];
+ int ret, i, base, ngpio;
+ char *chip_name;
if (gpio_mockup_params_nr < 2)
return -EINVAL;
- cntr = devm_kzalloc(dev, sizeof(*cntr) * (gpio_mockup_params_nr >> 1),
- GFP_KERNEL);
- if (!cntr)
+ chips = devm_kzalloc(dev,
+ sizeof(*chips) * (gpio_mockup_params_nr >> 1),
+ GFP_KERNEL);
+ if (!chips)
return -ENOMEM;
- platform_set_drvdata(pdev, cntr);
+ 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) {
- sprintf(chip_name, "%s-%c", GPIO_NAME,
- pins_name_start + i);
- ret = mockup_gpio_add(dev, &cntr[i],
+ 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) {
- if (base < 0)
- dev_err(dev, "gpio<%d..%d> add failed\n",
- base, ngpio);
- else
- dev_err(dev, "gpio<%d..%d> add failed\n",
- base, base + ngpio);
+ 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 mockup_gpio_driver = {
+static int gpio_mockup_remove(struct platform_device *pdev)
+{
+ struct gpio_mockup_chip *chips;
+ int i;
+
+ chips = platform_get_drvdata(pdev);
+
+ for (i = 0; i < gpio_mockup_params_nr >> 1; i++)
+ irq_free_descs(chips[i].gc.irq_base, chips[i].gc.ngpio);
+
+ return 0;
+}
+
+static struct platform_driver gpio_mockup_driver = {
.driver = {
- .name = GPIO_NAME,
- },
- .probe = mockup_gpio_probe,
+ .name = GPIO_MOCKUP_NAME,
+ },
+ .probe = gpio_mockup_probe,
+ .remove = gpio_mockup_remove,
};
static struct platform_device *pdev;
@@ -180,7 +399,12 @@ static int __init mock_device_init(void)
{
int err;
- pdev = platform_device_alloc(GPIO_NAME, -1);
+ 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;
@@ -190,7 +414,7 @@ static int __init mock_device_init(void)
return err;
}
- err = platform_driver_register(&mockup_gpio_driver);
+ err = platform_driver_register(&gpio_mockup_driver);
if (err) {
platform_device_unregister(pdev);
return err;
@@ -201,7 +425,8 @@ static int __init mock_device_init(void)
static void __exit mock_device_exit(void)
{
- platform_driver_unregister(&mockup_gpio_driver);
+ debugfs_remove_recursive(gpio_mockup_dbg_dir);
+ platform_driver_unregister(&gpio_mockup_driver);
platform_device_unregister(pdev);
}