Messages in this thread Patch in this message | | | From | Mattias Wallin <> | Subject | [PATCH] MFD: ab8500 chip id exported to sysfs | Date | Fri, 26 Nov 2010 13:05:25 +0100 |
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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
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