FMC: make eeprom attribute writable

This allows easier modification to the eeprom than loading the
fmc-write-eeprom module.  The carrier driver will refuse writing if
the FPGA is not running the golden gateware image, so writing in
practice is only available at manufacture/development time.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/fmc/fmc-core.c b/drivers/fmc/fmc-core.c
index 5a5e616c6324..353fc546fb08 100644
--- a/drivers/fmc/fmc-core.c
+++ b/drivers/fmc/fmc-core.c
@@ -99,10 +99,23 @@ static ssize_t fmc_read_eeprom(struct file *file, struct kobject *kobj,
         return count;
 }
 
+static ssize_t fmc_write_eeprom(struct file *file, struct kobject *kobj,
+                                struct bin_attribute *bin_attr,
+                                char *buf, loff_t off, size_t count)
+{
+        struct device *dev;
+        struct fmc_device *fmc;
+
+        dev = container_of(kobj, struct device, kobj);
+        fmc = container_of(dev, struct fmc_device, dev);
+        return fmc->op->write_ee(fmc, off, buf, count);
+}
+
 static struct bin_attribute fmc_eeprom_attr = {
-        .attr = { .name = "eeprom", .mode = S_IRUGO, },
+        .attr = { .name = "eeprom", .mode = S_IRUGO | S_IWUSR, },
         .size = 8192, /* more or less standard */
         .read = fmc_read_eeprom,
+        .write = fmc_write_eeprom,
 };
 
 /*