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authorLinus Walleij <linus.walleij@stericsson.com>2010-01-19 13:41:52 +0300
committerSamuel Ortiz <sameo@linux.intel.com>2010-03-08 00:17:10 +0300
commit2071db4848ea809887e97248dd3dec02a2e3dd6b (patch)
tree6af9118a691d9d68da42004e29e834fa3d2508d5 /drivers/mfd
parent6048a3dd2371c58611ea0ab8b306f8f1469399ae (diff)
downloadlinux-2071db4848ea809887e97248dd3dec02a2e3dd6b.tar.xz
mfd: Use AB3100 MFD core IRQ for interrupt randomness
This reintroduces the entropy sampling of the AB3100 IRQ as the IRQF_SAMPLE_RANDOM is going out according to the feature removal schedule. I'm trying to do this the right way then, so CC:ing some random people for a quick review. We add entropy for interrupt events in the AB3100 which are truly random in nature, like external cables being connected, voltages on batteries dropping below certain ranges, ADC triggers or overheating. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Cc: Robin Getz <rgetz@blackfin.uclinux.org> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/Kconfig4
-rw-r--r--drivers/mfd/ab3100-core.c17
2 files changed, 11 insertions, 10 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9bcd447e71e2..ea2557bb0bd4 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -329,8 +329,8 @@ config PCF50633_GPIO
the PCF50633 chip.
config AB3100_CORE
- tristate "ST-Ericsson AB3100 Mixed Signal Circuit core functions"
- depends on I2C
+ bool "ST-Ericsson AB3100 Mixed Signal Circuit core functions"
+ depends on I2C=y
default y if ARCH_U300
help
Select this to enable the AB3100 Mixed Signal IC core
diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c
index aa3824a1b4f2..a2ce3b6af4a2 100644
--- a/drivers/mfd/ab3100-core.c
+++ b/drivers/mfd/ab3100-core.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2007-2009 ST-Ericsson
+ * Copyright (C) 2007-2010 ST-Ericsson
* License terms: GNU General Public License (GPL) version 2
* Low-level core for exclusive access to the AB3100 IC on the I2C bus
* and some basic chip-configuration.
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/interrupt.h>
+#include <linux/random.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
@@ -376,6 +377,8 @@ static irqreturn_t ab3100_irq_handler(int irq, void *data)
u32 fatevent;
int err;
+ add_interrupt_randomness(irq);
+
err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
event_regs, 3);
if (err)
@@ -720,10 +723,7 @@ static struct platform_device ab3100_##devname##_device = { \
.id = -1, \
}
-/*
- * This lists all the subdevices and corresponding register
- * ranges.
- */
+/* This lists all the subdevices */
AB3100_DEVICE(dac, "ab3100-dac");
AB3100_DEVICE(leds, "ab3100-leds");
AB3100_DEVICE(power, "ab3100-power");
@@ -889,10 +889,11 @@ static int __init ab3100_probe(struct i2c_client *client,
if (err)
goto exit_no_setup;
- /* This real unpredictable IRQ is of course sampled for entropy */
err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
- IRQF_ONESHOT,
- "ab3100-core", ab3100);
+ IRQF_ONESHOT, "ab3100-core", ab3100);
+ /* This real unpredictable IRQ is of course sampled for entropy */
+ rand_initialize_irq(client->irq);
+
if (err)
goto exit_no_irq;