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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.c98
1 files changed, 56 insertions, 42 deletions
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index c6dadac70593..a6565e128f9e 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -3,6 +3,7 @@
*
* Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com>
* Copyright (C) 2015-2016 Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
+ * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
*
* 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
@@ -27,10 +28,15 @@
#define GPIO_MOCKUP_NAME "gpio-mockup"
#define GPIO_MOCKUP_MAX_GC 10
+/*
+ * We're storing two values per chip: the GPIO base and the number
+ * of GPIO lines.
+ */
+#define GPIO_MOCKUP_MAX_RANGES (GPIO_MOCKUP_MAX_GC * 2)
enum {
- DIR_IN = 0,
- DIR_OUT,
+ GPIO_MOCKUP_DIR_OUT = 0,
+ GPIO_MOCKUP_DIR_IN = 1,
};
/*
@@ -41,6 +47,7 @@ enum {
struct gpio_mockup_line_status {
int dir;
bool value;
+ bool irq_enabled;
};
struct gpio_mockup_irq_context {
@@ -61,7 +68,7 @@ struct gpio_mockup_dbgfs_private {
int offset;
};
-static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1];
+static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
static int gpio_mockup_params_nr;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
@@ -93,7 +100,7 @@ static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
gpio_mockup_set(gc, offset, value);
- chip->lines[offset].dir = DIR_OUT;
+ chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT;
return 0;
}
@@ -102,7 +109,7 @@ 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;
+ chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN;
return 0;
}
@@ -121,7 +128,7 @@ static int gpio_mockup_name_lines(struct device *dev,
char **names;
int i;
- names = devm_kzalloc(dev, sizeof(char *) * gc->ngpio, GFP_KERNEL);
+ names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
if (!names)
return -ENOMEM;
@@ -142,12 +149,21 @@ 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 void gpio_mockup_irqmask(struct irq_data *data)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+ struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
+
+ chip->lines[data->irq - gc->irq_base].irq_enabled = false;
+}
+
+static void gpio_mockup_irqunmask(struct irq_data *data)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+ struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
+
+ chip->lines[data->irq - gc->irq_base].irq_enabled = true;
+}
static struct irq_chip gpio_mockup_irqchip = {
.name = GPIO_MOCKUP_NAME,
@@ -178,6 +194,7 @@ static int gpio_mockup_irqchip_setup(struct device *dev,
for (i = 0; i < gc->ngpio; i++) {
irq_set_chip(irq_base + i, gc->irqchip);
+ irq_set_chip_data(irq_base + i, gc);
irq_set_handler(irq_base + i, &handle_simple_irq);
irq_modify_status(irq_base + i,
IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
@@ -197,8 +214,13 @@ static ssize_t gpio_mockup_event_write(struct file *file,
struct seq_file *sfile;
struct gpio_desc *desc;
struct gpio_chip *gc;
- int val;
- char buf;
+ int rv, val;
+
+ rv = kstrtoint_from_user(usr_buf, size, 0, &val);
+ if (rv)
+ return rv;
+ if (val != 0 && val != 1)
+ return -EINVAL;
sfile = file->private_data;
priv = sfile->private;
@@ -206,19 +228,11 @@ static ssize_t gpio_mockup_event_write(struct file *file,
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);
+ if (chip->lines[priv->offset].irq_enabled) {
+ 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;
}
@@ -294,8 +308,8 @@ static int gpio_mockup_add(struct device *dev,
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);
+ chip->lines = devm_kcalloc(dev, gc->ngpio,
+ sizeof(*chip->lines), GFP_KERNEL);
if (!chip->lines)
return -ENOMEM;
@@ -321,23 +335,24 @@ static int gpio_mockup_add(struct device *dev,
static int gpio_mockup_probe(struct platform_device *pdev)
{
- struct gpio_mockup_chip *chips;
+ int ret, i, base, ngpio, num_chips;
struct device *dev = &pdev->dev;
- int ret, i, base, ngpio;
+ struct gpio_mockup_chip *chips;
char *chip_name;
- if (gpio_mockup_params_nr < 2)
+ if (gpio_mockup_params_nr < 2 || (gpio_mockup_params_nr % 2))
return -EINVAL;
- chips = devm_kzalloc(dev,
- sizeof(*chips) * (gpio_mockup_params_nr >> 1),
- GFP_KERNEL);
+ /* Each chip is described by two values. */
+ num_chips = gpio_mockup_params_nr / 2;
+
+ chips = devm_kcalloc(dev, num_chips, sizeof(*chips), GFP_KERNEL);
if (!chips)
return -ENOMEM;
platform_set_drvdata(pdev, chips);
- for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
+ for (i = 0; i < num_chips; i++) {
base = gpio_mockup_ranges[i * 2];
if (base == -1)
@@ -355,18 +370,16 @@ static int gpio_mockup_probe(struct platform_device *pdev)
ret = gpio_mockup_add(dev, &chips[i],
chip_name, base, ngpio);
} else {
- ret = -1;
+ ret = -EINVAL;
}
if (ret) {
- dev_err(dev, "gpio<%d..%d> add failed\n",
- base, base < 0 ? ngpio : base + ngpio);
+ dev_err(dev,
+ "adding gpiochip failed: %d (base: %d, ngpio: %d)\n",
+ ret, base, base < 0 ? ngpio : base + ngpio);
return ret;
}
-
- dev_info(dev, "gpio<%d..%d> add successful!",
- base, base + ngpio);
}
return 0;
@@ -420,5 +433,6 @@ module_exit(mock_device_exit);
MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
+MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>");
MODULE_DESCRIPTION("GPIO Testing driver");
MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 09:46:06 +0000