[PATCH] MFD: ab8500 chip id exported to sysfs

Mattias Wallin
2010-11-26T12:05:41Z

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

Change-Id: I8e2c10e740a90ab210e023df4214b422c01f2efb
Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Ludovic Barre <ludovic.barre@stericsson.com>
---
drivers/mfd/ab8500-core.c | 27 ++++++++++++++++++++++++++-
1 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index e64569e..c59e832 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -98,7 +98,7 @@ static int ab8500_get_chip_id(struct device *dev)
if (!dev)
return -EINVAL;
ab8500 = dev_get_drvdata(dev->parent);
- return (int)ab8500->chip_id;
+ return ab8500 ? (int)ab8500->chip_id : -EINVAL;
}

static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
@@ -654,6 +654,26 @@ 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);
@@ -734,6 +754,10 @@ 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:
@@ -747,6 +771,7 @@ 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);
--
1.7.2.2