diff options
| author | Karthikeyan Ramasubramanian <kramasub@google.com> | 2021-02-09 10:07:47 -0700 |
|---|---|---|
| committer | Tim Wawrzynczak <twawrzynczak@chromium.org> | 2021-02-18 22:48:27 +0000 |
| commit | a7e6788ea70ea74fb905ae70035b74ec2caf39fd (patch) | |
| tree | 0de280694a0b5172f90d2f788c85ea3d46aa4599 /src/drivers/i2c | |
| parent | 02bec2bd5cbef9ab5fab422b801768686e436b51 (diff) | |
drivers/i2c/hid: Enforce level triggered IRQ mode
As per HID over I2C Protocol Specification[1] Version 1.00 Section 7.4,
the interrupt line used by the device is required to be level triggered.
This change ensures that the IRQ is appropriately configured.
References:
[1] http://download.microsoft.com/download/7/d/d/7dd44bb7-2a7a-4505-ac1c-7227d3d96d5b/hid-over-i2c-protocol-spec-v1-0.docx
BUG=b:172846122
TEST=./util/abuild/abuild. Build and boot to OS in Dedede.
Change-Id: I3245a9de6e88cd83528823251083e62288192f0d
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50442
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Diffstat (limited to 'src/drivers/i2c')
| -rw-r--r-- | src/drivers/i2c/hid/hid.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/drivers/i2c/hid/hid.c b/src/drivers/i2c/hid/hid.c index 2d213eb74e..8705c1e34a 100644 --- a/src/drivers/i2c/hid/hid.c +++ b/src/drivers/i2c/hid/hid.c @@ -1,6 +1,8 @@ /* SPDX-License-Identifier: GPL-2.0-only */ #include <acpi/acpigen_dsm.h> +#include <acpi/acpi_device.h> +#include <assert.h> #include <device/device.h> #include <string.h> #include "chip.h" @@ -68,6 +70,18 @@ static void i2c_hid_enable(struct device *dev) } } + /* + * Ensure that I2C HID devices use level triggered interrupts as per ACPI + * I2C HID requirement. Check interrupt and GPIO interrupt. + */ + if ((!config->generic.irq_gpio.pin_count && + config->generic.irq.mode != ACPI_IRQ_LEVEL_TRIGGERED) || + (config->generic.irq_gpio.pin_count && + config->generic.irq_gpio.irq.mode != ACPI_IRQ_LEVEL_TRIGGERED)) { + printk(BIOS_ERR, "%s IRQ is not level triggered.\n", config->generic.hid); + BUG(); + } + dev->ops = &i2c_hid_ops; if (config && config->generic.desc) { |