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);
 }