From 2071db4848ea809887e97248dd3dec02a2e3dd6b Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Tue, 19 Jan 2010 11:41:52 +0100 Subject: 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 Cc: Robin Getz Acked-by: Matt Mackall Signed-off-by: Samuel Ortiz --- drivers/mfd/Kconfig | 4 ++-- drivers/mfd/ab3100-core.c | 17 +++++++++-------- 2 files changed, 11 insertions(+), 10 deletions(-) (limited to 'drivers') diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 9bcd447e71e..ea2557bb0bd 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 aa3824a1b4f..a2ce3b6af4a 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 #include #include +#include #include #include #include @@ -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; -- cgit v1.2.3