linux-kernel - [PATCH 1/1] regmap-irq: Introduce inverted status registers support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 18 May 2021 12:44:41 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     linux-kernel@...r.kernel.org
Cc:     broonie@...nel.org, gregkh@...uxfoundation.org, rafael@...nel.org,
        Maxim Kochetkov <fido_max@...ox.ru>
Subject: [PATCH 1/1] regmap-irq: Introduce inverted status registers support

Some interrupt controllers have inverted status register:
cleared bits is active interrupts and set bits is inactive interrupts,
so add inverted status support to the framework.

Signed-off-by: Maxim Kochetkov <fido_max@...ox.ru>
---
 drivers/base/regmap/regmap-irq.c | 4 ++++
 include/linux/regmap.h           | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 760296a4b606..fbab3ff7b877 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -531,6 +531,10 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
 		}
 	}
 
+	if (chip->status_invert)
+		for (i = 0; i < data->chip->num_regs; i++)
+			data->status_buf[i] = ~data->status_buf[i];
+
 	/*
 	 * Ignore masked IRQs and ack if we need to; we ack early so
 	 * there is no race between handling and acknowleding the
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 8c16e6fa0f66..c5b7c9c600a5 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1413,6 +1413,7 @@ struct regmap_irq_sub_irq_map {
  * @not_fixed_stride: Used when chip peripherals are not laid out with fixed
  * 		      stride. Must be used with sub_reg_offsets containing the
  * 		      offsets to each peripheral.
+ * @status_invert: Inverted status register: cleared bits are active interrupts.
  * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
  *
  * @num_regs:    Number of registers in each control bank.
@@ -1465,6 +1466,7 @@ struct regmap_irq_chip {
 	bool type_in_mask:1;
 	bool clear_on_unmask:1;
 	bool not_fixed_stride:1;
+	bool status_invert:1;
 
 	int num_regs;
 
-- 
2.31.1