[PATCH v5 4/5] platform/x86: touchscreen_dmi: Add EFI embedded firmware info support

Hans de Goede
2018-04-29T09:35:57Z

Sofar we have been unable to get permission from the vendors to put the
firmware for touchscreens listed in touchscreen_dmi in linux-firmware.

Some of the tablets with such a touchscreen have a touchscreen driver, and
thus a copy of the firmware, as part of their EFI code.

This commit adds the necessary info for the new EFI embedded-firmware code
to extract these firmwares, making the touchscreen work OOTB without the
user needing to manually add the firmware.

Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/firmware/efi/embedded-firmware.c | 3 +++
drivers/platform/x86/Kconfig | 1 +
drivers/platform/x86/touchscreen_dmi.c | 26 +++++++++++++++++++++++-
include/linux/efi_embedded_fw.h | 2 ++
4 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/embedded-firmware.c b/drivers/firmware/efi/embedded-firmware.c
index 22a0f598b53d..36a93a6938f0 100644
--- a/drivers/firmware/efi/embedded-firmware.c
+++ b/drivers/firmware/efi/embedded-firmware.c
@@ -23,6 +23,9 @@ struct embedded_fw {
static LIST_HEAD(found_fw_list);

static const struct dmi_system_id * const embedded_fw_table[] = {
+#ifdef CONFIG_TOUCHSCREEN_DMI
+ touchscreen_dmi_table,
+#endif
NULL
};

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 7ff206e5edfe..cc4d95459190 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1199,6 +1199,7 @@ config INTEL_TURBO_MAX_3
config TOUCHSCREEN_DMI
bool "DMI based touchscreen configuration info"
depends on ACPI && DMI && I2C=y && TOUCHSCREEN_SILEAD
+ select EFI_EMBEDDED_FIRMWARE if EFI
---help---
Certain ACPI based tablets with e.g. Silead or Chipone touchscreens
do not have enough data in ACPI tables for the touchscreen driver to
diff --git a/drivers/platform/x86/touchscreen_dmi.c b/drivers/platform/x86/touchscreen_dmi.c
index 87fc839b28f7..6488cd50ba79 100644
--- a/drivers/platform/x86/touchscreen_dmi.c
+++ b/drivers/platform/x86/touchscreen_dmi.c
@@ -15,12 +15,15 @@
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/dmi.h>
+#include <linux/efi_embedded_fw.h>
#include <linux/i2c.h>
#include <linux/notifier.h>
#include <linux/property.h>
#include <linux/string.h>

struct ts_dmi_data {
+ /* The EFI embedded-fw code expects this to be the first member! */
+ struct efi_embedded_fw_desc embedded_fw;
const char *acpi_name;
const struct property_entry *properties;
};
@@ -31,10 +34,17 @@ static const struct property_entry cube_iwork8_air_props[] = {
PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"),
PROPERTY_ENTRY_STRING("firmware-name", "gsl3670-cube-iwork8-air.fw"),
PROPERTY_ENTRY_U32("silead,max-fingers", 10),
+ PROPERTY_ENTRY_BOOL("efi-embedded-firmware"),
{ }
};

static const struct ts_dmi_data cube_iwork8_air_data = {
+ .embedded_fw = {
+ .name = "silead/gsl3670-cube-iwork8-air.fw",
+ .prefix = { 0xf0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00 },
+ .length = 38808,
+ .crc = 0xfecde51f,
+ },
.acpi_name = "MSSL1680:00",
.properties = cube_iwork8_air_props,
};
@@ -119,10 +129,17 @@ static const struct property_entry pipo_w2s_props[] = {
PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"),
PROPERTY_ENTRY_STRING("firmware-name",
"gsl1680-pipo-w2s.fw"),
+ PROPERTY_ENTRY_BOOL("efi-embedded-firmware"),
{ }
};

static const struct ts_dmi_data pipo_w2s_data = {
+ .embedded_fw = {
+ .name = "silead/gsl1680-pipo-w2s.fw",
+ .prefix = { 0xf0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00 },
+ .length = 39072,
+ .crc = 0x28d5dc6c,
+ },
.acpi_name = "MSSL1680:00",
.properties = pipo_w2s_props,
};
@@ -162,10 +179,17 @@ static const struct property_entry chuwi_hi8_pro_props[] = {
PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"),
PROPERTY_ENTRY_STRING("firmware-name", "gsl3680-chuwi-hi8-pro.fw"),
PROPERTY_ENTRY_BOOL("silead,home-button"),
+ PROPERTY_ENTRY_BOOL("efi-embedded-firmware"),
{ }
};

static const struct ts_dmi_data chuwi_hi8_pro_data = {
+ .embedded_fw = {
+ .name = "silead/gsl3680-chuwi-hi8-pro.fw",
+ .prefix = { 0xf0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00 },
+ .length = 39864,
+ .crc = 0xfe2bedba,
+ },
.acpi_name = "MSSL1680:00",
.properties = chuwi_hi8_pro_props,
};
@@ -277,7 +301,7 @@ static const struct ts_dmi_data teclast_x3_plus_data = {
.properties = teclast_x3_plus_props,
};

-static const struct dmi_system_id touchscreen_dmi_table[] = {
+const struct dmi_system_id touchscreen_dmi_table[] = {
{
/* CUBE iwork8 Air */
.driver_data = (void *)&cube_iwork8_air_data,
diff --git a/include/linux/efi_embedded_fw.h b/include/linux/efi_embedded_fw.h
index 0f7d4df3f57a..4c8cfe38ec02 100644
--- a/include/linux/efi_embedded_fw.h
+++ b/include/linux/efi_embedded_fw.h
@@ -20,6 +20,8 @@ struct efi_embedded_fw_desc {
u32 crc;
};

+extern const struct dmi_system_id touchscreen_dmi_table[];
+
int efi_get_embedded_fw(const char *name, void **dat, size_t *sz, size_t msize);

#endif
--
2.17.0