fmc-fakedev: provide a validate method

fmc-fakedev fakes removal and re-plugging when the eepromo is overwritten. Thus, fmc-write-eeprom would match again and again, rewriting every two seconds, forever. By offsering ops->validate, the carrier prevents further matches. To only write the first time, you can use the following, since identifiers in fakedev start from 0xf001 ("fool"). insmod fmc-write-eeprom busid=0xf001 The Identifier is increased avery time, so a 4-slot instance will have identifiers 0xf001-0xf004 the first time and 0xf005-0xf008 the next one. This merhod allows fmc-write-eeprom to not match the busid Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

fmc-fakedev: provide a validate method
fmc-fakedev fakes removal and re-plugging when the eepromo is overwritten. Thus, fmc-write-eeprom would match again and again, rewriting every two seconds, forever. By offsering ops->validate, the carrier prevents further matches. To only write the first time, you can use the following, since identifiers in fakedev start from 0xf001 ("fool"). insmod fmc-write-eeprom busid=0xf001 The Identifier is increased avery time, so a 4-slot instance will have identifiers 0xf001-0xf004 the first time and 0xf005-0xf008 the next one. This merhod allows fmc-write-eeprom to not match the busid Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
d2943cb4 · Alessandro Rubini · 7f523503 · d2943cb4
Commit d2943cb4 authored Apr 05, 2013 by Alessandro Rubini
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fmc-fakedev.c kernel/fmc-fakedev.c +16 -0

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--- a/kernel/fmc-fakedev.c
+++ b/kernel/fmc-fakedev.c
@@ -210,6 +210,21 @@ void ff_writel(struct fmc_device *fmc, uint32_t value, int offset)
 	return;
 }

+/* validate is useful so fmc-write-eeprom will not reprogram every 2 seconds */
+static int ff_validate(struct fmc_device *fmc, struct fmc_driver *drv)
+{
+	int i;
+
+	if (!drv->busid_n)
+		return 0; /* everyhing is valid */
+	for (i = 0; i < drv->busid_n; i++)
+		if (drv->busid_val[i] == fmc->device_id)
+			return i;
+	return -ENOENT;
+}
+
+
+
 static struct fmc_operations ff_fmc_operations = {
 	.readl =		ff_readl,
 	.writel =		ff_writel,
@@ -217,6 +232,7 @@ static struct fmc_operations ff_fmc_operations = {
 	.irq_request =		ff_irq_request,
 	.read_ee =		ff_read_ee,
 	.write_ee =		ff_write_ee,
+	.validate =		ff_validate,
 };

 /* This device is kmalloced: release it */