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Subject[PATCH 1/2] x86: Conditional init of pcengines leds/keys gpios
Date
The pcengines bios/firmware includes ACPI tables (since 4.10.0.1) which
will cause the kernel to automatically create led + gpio_key devices for
the platform. This means that the platform setup now creates duplicates
of all these led/key devices.

Driver conditionally initialises leds/keys only for older bios.

Signed-off-by: Ed Wildgoose <lists@wildgooses.com>
---
drivers/platform/x86/pcengines-apuv2.c | 115 +++++++++++++++++++------
1 file changed, 90 insertions(+), 25 deletions(-)

diff --git a/drivers/platform/x86/pcengines-apuv2.c b/drivers/platform/x86/pcengines-apuv2.c
index c37349f97..45f7a89de 100644
--- a/drivers/platform/x86/pcengines-apuv2.c
+++ b/drivers/platform/x86/pcengines-apuv2.c
@@ -128,6 +128,18 @@ static struct gpiod_lookup_table gpios_key_table = {

/* Board setup */

+struct apu_driver_data {
+ const struct amd_fch_gpio_pdata *board_data;
+ const struct gpio_keys_platform_data *apu_keys_pdata;
+ const struct gpio_led_platform_data *apu_leds_pdata;
+};
+
+static struct apu_driver_data apu2_driver_data = {
+ .board_data = &board_apu2,
+ .apu_keys_pdata = &apu2_keys_pdata,
+ .apu_leds_pdata = &apu2_leds_pdata
+};
+
/* Note: matching works on string prefix, so "apu2" must come before "apu" */
static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {

@@ -138,7 +150,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "APU2")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU2 w/ legacy BIOS >= 4.0.8 */
{
@@ -147,7 +159,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "apu2")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU2 w/ mainline BIOS */
{
@@ -156,7 +168,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},

/* APU3 w/ legacy BIOS < 4.0.8 */
@@ -166,7 +178,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "APU3")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU3 w/ legacy BIOS >= 4.0.8 */
{
@@ -175,7 +187,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "apu3")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU3 w/ mainline BIOS */
{
@@ -184,7 +196,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU4 w/ legacy BIOS < 4.0.8 */
{
@@ -193,7 +205,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "APU4")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU4 w/ legacy BIOS >= 4.0.8 */
{
@@ -202,7 +214,7 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "apu4")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
/* APU4 w/ mainline BIOS */
{
@@ -211,11 +223,42 @@ static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu4")
},
- .driver_data = (void *)&board_apu2,
+ .driver_data = (void *)&apu2_driver_data,
},
{}
};

+int cmp_version(const char *base, const char *test)
+{
+ int i;
+ int oct_base[4], oct_test[4];
+ int matched_base, matched;
+
+ matched_base = sscanf(base, "v%4d.%4d.%4d.%4d",
+ &oct_base[0], &oct_base[1],
+ &oct_base[2], &oct_base[3]);
+ matched = sscanf(test, "v%4d.%4d.%4d.%4d",
+ &oct_test[0], &oct_test[1],
+ &oct_test[2], &oct_test[3]);
+
+ /* opinionated: match as lower if we can't parse test version */
+ if (matched == 0)
+ return -1;
+
+ if (matched_base < matched)
+ matched = matched_base;
+
+ for (i = 0; i < matched; i++) {
+ if (oct_test[i] > oct_base[i])
+ return 1;
+ else if (oct_test[i] < oct_base[i])
+ return -1;
+ }
+
+ return 0;
+}
+
+
static struct platform_device *apu_gpio_pdev;
static struct platform_device *apu_leds_pdev;
static struct platform_device *apu_keys_pdev;
@@ -244,41 +287,63 @@ static struct platform_device * __init apu_create_pdev(
static int __init apu_board_init(void)
{
const struct dmi_system_id *id;
+ const struct apu_driver_data *driver_data;
+ char const *bios_ver;
+
+ apu_leds_pdev = apu_keys_pdev = NULL;

id = dmi_first_match(apu_gpio_dmi_table);
if (!id) {
pr_err("failed to detect APU board via DMI\n");
return -ENODEV;
+ } else {
+ pr_info("Detected APU board: %s - BIOS: %s\n",
+ dmi_get_system_info(DMI_BOARD_NAME),
+ dmi_get_system_info(DMI_BIOS_VERSION));
}

- gpiod_add_lookup_table(&gpios_led_table);
- gpiod_add_lookup_table(&gpios_key_table);
+ driver_data = id->driver_data;
+ bios_ver = dmi_get_system_info(DMI_BIOS_VERSION);

apu_gpio_pdev = apu_create_pdev(
AMD_FCH_GPIO_DRIVER_NAME,
- id->driver_data,
+ driver_data->board_data,
sizeof(struct amd_fch_gpio_pdata));

- apu_leds_pdev = apu_create_pdev(
- "leds-gpio",
- &apu2_leds_pdata,
- sizeof(apu2_leds_pdata));
-
- apu_keys_pdev = apu_create_pdev(
- "gpio-keys-polled",
- &apu2_keys_pdata,
- sizeof(apu2_keys_pdata));
+ if (cmp_version("v4.10", bios_ver) < 0) {
+ /* Newer bios configure LEDs/keys via ACPI */
+
+ if (driver_data->apu_keys_pdata) {
+ gpiod_add_lookup_table(&gpios_key_table);
+ apu_keys_pdev = apu_create_pdev(
+ "gpio-keys-polled",
+ driver_data->apu_keys_pdata,
+ sizeof(struct gpio_keys_platform_data));
+ }
+
+ if (driver_data->apu_leds_pdata) {
+ gpiod_add_lookup_table(&gpios_led_table);
+ apu_leds_pdev = apu_create_pdev(
+ "leds-gpio",
+ driver_data->apu_leds_pdata,
+ sizeof(struct gpio_led_platform_data));
+ }
+ }

return 0;
}

static void __exit apu_board_exit(void)
{
- gpiod_remove_lookup_table(&gpios_led_table);
- gpiod_remove_lookup_table(&gpios_key_table);
+ if (apu_keys_pdev) {
+ gpiod_remove_lookup_table(&gpios_key_table);
+ platform_device_unregister(apu_keys_pdev);
+ }
+ if (apu_leds_pdev) {
+ gpiod_remove_lookup_table(&gpios_led_table);
+ platform_device_unregister(apu_leds_pdev);
+ }

- platform_device_unregister(apu_keys_pdev);
- platform_device_unregister(apu_leds_pdev);
platform_device_unregister(apu_gpio_pdev);
}

--
2.26.2
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