mfd: Export ab8500 chip id to sysfs

This patch adds a file into sysfs for reading out chip id.
It has been requested for modem silent reboot.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Ludovic Barre <ludovic.barre@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index e91b5b759004..2bd4437cf331 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -436,6 +436,26 @@ static struct mfd_cell ab8500_devs[] = {
         },
 };
 
+static ssize_t show_chip_id(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        struct ab8500 *ab8500;
+
+        ab8500 = dev_get_drvdata(dev);
+        return sprintf(buf, "%#x\n", ab8500 ? ab8500->chip_id : -EINVAL);
+}
+
+static DEVICE_ATTR(chip_id, S_IRUGO, show_chip_id, NULL);
+
+static struct attribute *ab8500_sysfs_entries[] = {
+        &dev_attr_chip_id.attr,
+        NULL,
+};
+
+static struct attribute_group ab8500_attr_group = {
+        .attrs  = ab8500_sysfs_entries,
+};
+
 int __devinit ab8500_init(struct ab8500 *ab8500)
 {
         struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
@@ -510,6 +530,10 @@ int __devinit ab8500_init(struct ab8500 *ab8500)
         if (ret)
                 goto out_freeirq;
 
+        ret = sysfs_create_group(&ab8500->dev->kobj, &ab8500_attr_group);
+        if (ret)
+                dev_err(ab8500->dev, "error creating sysfs entries\n");
+
         return ret;
 
 out_freeirq:
@@ -523,6 +547,7 @@ out_removeirq:
 
 int __devexit ab8500_exit(struct ab8500 *ab8500)
 {
+        sysfs_remove_group(&ab8500->dev->kobj, &ab8500_attr_group);
         mfd_remove_devices(ab8500->dev);
         if (ab8500->irq_base) {
                 free_irq(ab8500->irq, ab8500);