platform/x86/drivers/acerhdf: Use module_param_cb to set/get polling interval

The module parameter can be set by using ops to get and set the
values. The change will allow to check the correctness of the interval
value everytime it is changed instead of checking in the get_temp
function.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Peter Kaestle <peter@piie.net>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20201203071738.2363701-1-daniel.lezcano@linaro.org

drivers/platform/x86/acerhdf.c

@@ -84,8 +84,6 @@ static struct platform_device *acerhdf_dev;
 
 module_param(kernelmode, uint, 0);
 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off");
-module_param(interval, uint, 0600);
-MODULE_PARM_DESC(interval, "Polling interval of temperature check");
 module_param(fanon, uint, 0600);
 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
 module_param(fanoff, uint, 0600);
@@ -824,3 +822,11 @@ MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
 
 module_init(acerhdf_init);
 module_exit(acerhdf_exit);
+
+static const struct kernel_param_ops interval_ops = {
+	.set = param_set_uint,
+	.get = param_get_uint,
+};
+
+module_param_cb(interval, &interval_ops, &interval, 0600);
+MODULE_PARM_DESC(interval, "Polling interval of temperature check");