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ACPI: button: Refactor lid_init_state module parsing code

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Replace the weird strncmp() calls in param_set_lid_init_state(),
which look to me like they will also accept things like "opennnn"
to use sysfs_match_string instead.

Also rewrite param_get_lid_init_state() using the new lid_init_state_str
array. Instead of doing a straightforward one line replacement, e.g. :
  return sprintf(buffer, lid_init_state_str[lid_init_state]);
print all possible values, putting [] around the selected value, so
that users can easily find out what the possible values are.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2019-10-26 22:24:31 +02:00 committed by Rafael J. Wysocki
parent d6d5df1db6
commit 065bd4d35b
1 changed files with 31 additions and 29 deletions
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60
drivers/acpi/button.c
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@ -44,9 +44,17 @@
#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
#define ACPI_BUTTON_TYPE_LID 0x05
#define ACPI_BUTTON_LID_INIT_IGNORE 0x00
#define ACPI_BUTTON_LID_INIT_OPEN 0x01
#define ACPI_BUTTON_LID_INIT_METHOD 0x02
enum {
ACPI_BUTTON_LID_INIT_IGNORE,
ACPI_BUTTON_LID_INIT_OPEN,
ACPI_BUTTON_LID_INIT_METHOD,
};
static const char * const lid_init_state_str[] = {
[ACPI_BUTTON_LID_INIT_IGNORE] = "ignore",
[ACPI_BUTTON_LID_INIT_OPEN] = "open",
[ACPI_BUTTON_LID_INIT_METHOD] = "method",
};
#define _COMPONENT ACPI_BUTTON_COMPONENT
ACPI_MODULE_NAME("button");
@ -578,36 +586,30 @@ static int acpi_button_remove(struct acpi_device *device)
static int param_set_lid_init_state(const char *val,
const struct kernel_param *kp)
{
int result = 0;
int i;
if (!strncmp(val, "open", sizeof("open") - 1)) {
lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
pr_info("Notify initial lid state as open\n");
} else if (!strncmp(val, "method", sizeof("method") - 1)) {
lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
pr_info("Notify initial lid state with _LID return value\n");
} else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
pr_info("Do not notify initial lid state\n");
} else
result = -EINVAL;
return result;
i = sysfs_match_string(lid_init_state_str, val);
if (i < 0)
return i;
lid_init_state = i;
pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]);
return 0;
}
static int param_get_lid_init_state(char *buffer,
const struct kernel_param *kp)
static int param_get_lid_init_state(char *buf, const struct kernel_param *kp)
{
switch (lid_init_state) {
case ACPI_BUTTON_LID_INIT_OPEN:
return sprintf(buffer, "open");
case ACPI_BUTTON_LID_INIT_METHOD:
return sprintf(buffer, "method");
case ACPI_BUTTON_LID_INIT_IGNORE:
return sprintf(buffer, "ignore");
default:
return sprintf(buffer, "invalid");
}
return 0;
int i, c = 0;
for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++)
if (i == lid_init_state)
c += sprintf(buf + c, "[%s] ", lid_init_state_str[i]);
else
c += sprintf(buf + c, "%s ", lid_init_state_str[i]);
buf[c - 1] = '\n'; /* Replace the final space with a newline */
return c;
}
module_param_call(lid_init_state,