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gpio: mockup: use the generic 'gpio-line-names' property 

GPIO line names are currently created by the driver from the chip label.
We'll want to support custom formats for line names (for instance: to
name all lines the same) for user-space tests so create them in the
module init function and pass them to the driver using the standard
'gpio-line-names' property.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Bartosz Golaszewski 2020-09-29 12:10:03 +02:00
parent 148c2560c5
commit 582be05ea4
1 changed files with 38 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/gpio/gpio-mockup.c
View File

@ -19,6 +19,7 @@
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>
#include <linux/uaccess.h>
#include "gpiolib.h"
@ -374,29 +375,6 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
}
}
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_kcalloc(dev, gc->ngpio, sizeof(char *), 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 void gpio_mockup_dispose_mappings(void *data)
{
struct gpio_mockup_chip *chip = data;
@ -464,12 +442,6 @@ static int gpio_mockup_probe(struct platform_device *pdev)
for (i = 0; i < gc->ngpio; i++)
chip->lines[i].dir = GPIO_LINE_DIRECTION_IN;
if (device_property_read_bool(dev, "named-gpio-lines")) {
rv = gpio_mockup_name_lines(dev, chip);
if (rv)
return rv;
}
chip->irq_sim_domain = devm_irq_domain_create_sim(dev, NULL,
gc->ngpio);
if (IS_ERR(chip->irq_sim_domain))
@ -510,6 +482,27 @@ static void gpio_mockup_unregister_pdevs(void)
}
}
static __init char **gpio_mockup_make_line_names(const char *label,
unsigned int num_lines)
{
unsigned int i;
char **names;
names = kcalloc(num_lines + 1, sizeof(char *), GFP_KERNEL);
if (!names)
return NULL;
for (i = 0; i < num_lines; i++) {
names[i] = kasprintf(GFP_KERNEL, "%s-%u", label, i);
if (!names[i]) {
kfree_strarray(names, i);
return NULL;
}
}
return names;
}
static int __init gpio_mockup_init(void)
{
struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
@ -517,6 +510,7 @@ static int __init gpio_mockup_init(void)
struct platform_device_info pdevinfo;
struct platform_device *pdev;
char chip_label[32];
char **line_names;
u16 ngpio;
if ((gpio_mockup_num_ranges < 2) ||
@ -549,6 +543,7 @@ static int __init gpio_mockup_init(void)
memset(properties, 0, sizeof(properties));
memset(&pdevinfo, 0, sizeof(pdevinfo));
prop = 0;
line_names = NULL;
snprintf(chip_label, sizeof(chip_label),
"gpio-mockup-%c", i + 'A');
@ -564,15 +559,26 @@ static int __init gpio_mockup_init(void)
: gpio_mockup_range_ngpio(i) - base;
properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
if (gpio_mockup_named_lines)
properties[prop++] = PROPERTY_ENTRY_BOOL(
"named-gpio-lines");
if (gpio_mockup_named_lines) {
line_names = gpio_mockup_make_line_names(chip_label,
ngpio);
if (!line_names) {
platform_driver_unregister(&gpio_mockup_driver);
gpio_mockup_unregister_pdevs();
return -ENOMEM;
}
properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
"gpio-line-names",
line_names, ngpio);
}
pdevinfo.name = "gpio-mockup";
pdevinfo.id = i;
pdevinfo.properties = properties;
pdev = platform_device_register_full(&pdevinfo);
kfree_strarray(line_names, ngpio);
if (IS_ERR(pdev)) {
pr_err("error registering device");
platform_driver_unregister(&gpio_mockup_driver);