Re: [PATCH v2] Input: i8042 - Add deferred probe support
From: Samuel Čavoj
Date: Mon Nov 22 2021 - 15:57:02 EST
Hi Takashi,
On 2021-11-17 07:37, Takashi Iwai wrote:
[...]
The deferred probe mode is enabled either via the new option
i8042.probe_defer or via the quirk table entry. As of this patch, the
quirk table contains only ASUS ZenBook UX425UA.
I own the ASUS ZenBook UX325UA and it has the exact same problem.
Would you add it to the quirk table, or should I just submit another
patch based on this one?
The output of `dmidecode` is as follows:
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ZenBook UX325UA_UM325UA
Thank you for tracking down this problem.
The deferred probe part is based on Fabio's initial work.
BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1190256
Link: https://lore.kernel.org/r/s5ho890n1rh.wl-tiwai@xxxxxxx
Cc: Fabio Estevam <festevam@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Tested-by: Samuel Čavoj <samuel@xxxxxxxxx>
Regards,
Samuel
---
v1->v2: Fix a typo in MODULE_PARM_DESC()
.../admin-guide/kernel-parameters.txt | 2 +
drivers/input/serio/i8042-x86ia64io.h | 14 +++++
drivers/input/serio/i8042.c | 54 ++++++++++++-------
3 files changed, 51 insertions(+), 19 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt
b/Documentation/admin-guide/kernel-parameters.txt
index 9725c546a0d4..7f09fbd73245 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1689,6 +1689,8 @@
architectures force reset to be always executed
i8042.unlock [HW] Unlock (ignore) the keylock
i8042.kbdreset [HW] Reset device connected to KBD port
+ i8042.probe_defer
+ [HW] Allow deferred probing upon i8042 probe errors
i810= [HW,DRM]
diff --git a/drivers/input/serio/i8042-x86ia64io.h
b/drivers/input/serio/i8042-x86ia64io.h
index aedd05541044..1acc7c844929 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -995,6 +995,17 @@ static const struct dmi_system_id __initconst
i8042_dmi_kbdreset_table[] = {
{ }
};
+static const struct dmi_system_id i8042_dmi_probe_defer_table[]
__initconst = {
+ {
+ /* ASUS ZenBook UX425UA */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX425UA"),
+ },
+ },
+ { }
+};
+
#endif /* CONFIG_X86 */
#ifdef CONFIG_PNP
@@ -1315,6 +1326,9 @@ static int __init i8042_platform_init(void)
if (dmi_check_system(i8042_dmi_kbdreset_table))
i8042_kbdreset = true;
+ if (dmi_check_system(i8042_dmi_probe_defer_table))
+ i8042_probe_defer = true;
+
/*
* A20 was already enabled during early kernel init. But some buggy
* BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 0b9f1d0a8f8b..3fc0a89cc785 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -45,6 +45,10 @@ static bool i8042_unlock;
module_param_named(unlock, i8042_unlock, bool, 0);
MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");
+static bool i8042_probe_defer;
+module_param_named(probe_defer, i8042_probe_defer, bool, 0);
+MODULE_PARM_DESC(probe_defer, "Allow deferred probing.");
+
enum i8042_controller_reset_mode {
I8042_RESET_NEVER,
I8042_RESET_ALWAYS,
@@ -711,7 +715,7 @@ static int i8042_set_mux_mode(bool multiplex,
unsigned char *mux_version)
* LCS/Telegraphics.
*/
-static int __init i8042_check_mux(void)
+static int i8042_check_mux(void)
{
unsigned char mux_version;
@@ -740,10 +744,10 @@ static int __init i8042_check_mux(void)
/*
* The following is used to test AUX IRQ delivery.
*/
-static struct completion i8042_aux_irq_delivered __initdata;
-static bool i8042_irq_being_tested __initdata;
+static struct completion i8042_aux_irq_delivered;
+static bool i8042_irq_being_tested;
-static irqreturn_t __init i8042_aux_test_irq(int irq, void *dev_id)
+static irqreturn_t i8042_aux_test_irq(int irq, void *dev_id)
{
unsigned long flags;
unsigned char str, data;
@@ -770,7 +774,7 @@ static irqreturn_t __init i8042_aux_test_irq(int
irq, void *dev_id)
* verifies success by readinng CTR. Used when testing for presence of
AUX
* port.
*/
-static int __init i8042_toggle_aux(bool on)
+static int i8042_toggle_aux(bool on)
{
unsigned char param;
int i;
@@ -798,7 +802,7 @@ static int __init i8042_toggle_aux(bool on)
* the presence of an AUX interface.
*/
-static int __init i8042_check_aux(void)
+static int i8042_check_aux(void)
{
int retval = -1;
bool irq_registered = false;
@@ -1005,7 +1009,7 @@ static int i8042_controller_init(void)
if (i8042_command(&ctr[n++ % 2], I8042_CMD_CTL_RCTR)) {
pr_err("Can't read CTR while initializing i8042\n");
- return -EIO;
+ return i8042_probe_defer ? -EPROBE_DEFER : -EIO;
}
} while (n < 2 || ctr[0] != ctr[1]);
@@ -1320,7 +1324,7 @@ static void i8042_shutdown(struct platform_device
*dev)
i8042_controller_reset(false);
}
-static int __init i8042_create_kbd_port(void)
+static int i8042_create_kbd_port(void)
{
struct serio *serio;
struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];
@@ -1349,7 +1353,7 @@ static int __init i8042_create_kbd_port(void)
return 0;
}
-static int __init i8042_create_aux_port(int idx)
+static int i8042_create_aux_port(int idx)
{
struct serio *serio;
int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
@@ -1386,13 +1390,13 @@ static int __init i8042_create_aux_port(int
idx)
return 0;
}
-static void __init i8042_free_kbd_port(void)
+static void i8042_free_kbd_port(void)
{
kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
}
-static void __init i8042_free_aux_ports(void)
+static void i8042_free_aux_ports(void)
{
int i;
@@ -1402,7 +1406,7 @@ static void __init i8042_free_aux_ports(void)
}
}
-static void __init i8042_register_ports(void)
+static void i8042_register_ports(void)
{
int i;
@@ -1443,7 +1447,7 @@ static void i8042_free_irqs(void)
i8042_aux_irq_registered = i8042_kbd_irq_registered = false;
}
-static int __init i8042_setup_aux(void)
+static int i8042_setup_aux(void)
{
int (*aux_enable)(void);
int error;
@@ -1485,7 +1489,7 @@ static int __init i8042_setup_aux(void)
return error;
}
-static int __init i8042_setup_kbd(void)
+static int i8042_setup_kbd(void)
{
int error;
@@ -1535,7 +1539,7 @@ static int i8042_kbd_bind_notifier(struct
notifier_block *nb,
return 0;
}
-static int __init i8042_probe(struct platform_device *dev)
+static int i8042_probe(struct platform_device *dev)
{
int error;
@@ -1600,6 +1604,7 @@ static struct platform_driver i8042_driver = {
.pm = &i8042_pm_ops,
#endif
},
+ .probe = i8042_probe,
.remove = i8042_remove,
.shutdown = i8042_shutdown,
};
@@ -1610,7 +1615,6 @@ static struct notifier_block
i8042_kbd_bind_notifier_block = {
static int __init i8042_init(void)
{
- struct platform_device *pdev;
int err;
dbg_init();
@@ -1626,17 +1630,29 @@ static int __init i8042_init(void)
/* Set this before creating the dev to allow i8042_command to work
right away */
i8042_present = true;
- pdev = platform_create_bundle(&i8042_driver, i8042_probe, NULL, 0,
NULL, 0);
- if (IS_ERR(pdev)) {
- err = PTR_ERR(pdev);
+ err = platform_driver_register(&i8042_driver);
+ if (err)
goto err_platform_exit;
+
+ i8042_platform_device = platform_device_alloc("i8042", -1);
+ if (!i8042_platform_device) {
+ err = -ENOMEM;
+ goto err_unregister_driver;
}
+ err = platform_device_add(i8042_platform_device);
+ if (err)
+ goto err_free_device;
+
bus_register_notifier(&serio_bus, &i8042_kbd_bind_notifier_block);
panic_blink = i8042_panic_blink;
return 0;
+err_free_device:
+ platform_device_put(i8042_platform_device);
+err_unregister_driver:
+ platform_driver_unregister(&i8042_driver);
err_platform_exit:
i8042_platform_exit();
return err;