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platform/chrome: cros_ec_lpc: Register the driver if ACPI entry is missing. 

Commit 12278dc7c5 ("platform/chrome: cros_ec_lpc: Add support for
GOOG004 ACPI device") added support when the firmware reports the ACPI
device, there are some firmwares though that doesn't report this device
but have it. In such cases we need to instantiate the driver explicitly
if it is not instantiated through ACPI.

Fixes: 12278dc7c5 ("platform/chrome: cros_ec_lpc: Add support for GOOG004 ACPI device")
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Benson Leung <bleung@chromium.org>
This commit is contained in:
Enric Balletbo i Serra 2017-12-01 14:42:21 +01:00 committed by Benson Leung
parent d3b56c566d
commit 5f454bdf63
No known key found for this signature in database
GPG Key ID: 1F09F57B0A2FE658
1 changed files with 33 additions and 1 deletions
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34
drivers/platform/chrome/cros_ec_lpc.c
View File

@ -35,6 +35,9 @@
#define DRV_NAME "cros_ec_lpcs"
#define ACPI_DRV_NAME "GOOG0004"
/* True if ACPI device is present */
static bool cros_ec_lpc_acpi_device_found;
static int ec_response_timed_out(void)
{
unsigned long one_second = jiffies + HZ;
@ -393,9 +396,21 @@ static struct platform_driver cros_ec_lpc_driver = {
.remove = cros_ec_lpc_remove,
};
static struct platform_device cros_ec_lpc_device = {
.name = DRV_NAME
};
static acpi_status cros_ec_lpc_parse_device(acpi_handle handle, u32 level,
void *context, void **retval)
{
*(bool *)context = true;
return AE_CTRL_TERMINATE;
}
static int __init cros_ec_lpc_init(void)
{
int ret;
acpi_status status;
if (!dmi_check_system(cros_ec_lpc_dmi_table)) {
pr_err(DRV_NAME ": unsupported system.\n");
@ -412,11 +427,28 @@ static int __init cros_ec_lpc_init(void)
return ret;
}
return 0;
status = acpi_get_devices(ACPI_DRV_NAME, cros_ec_lpc_parse_device,
&cros_ec_lpc_acpi_device_found, NULL);
if (ACPI_FAILURE(status))
pr_warn(DRV_NAME ": Looking for %s failed\n", ACPI_DRV_NAME);
if (!cros_ec_lpc_acpi_device_found) {
/* Register the device, and it'll get hooked up automatically */
ret = platform_device_register(&cros_ec_lpc_device);
if (ret) {
pr_err(DRV_NAME ": can't register device: %d\n", ret);
platform_driver_unregister(&cros_ec_lpc_driver);
cros_ec_lpc_reg_destroy();
}
}
return ret;
}
static void __exit cros_ec_lpc_exit(void)
{
if (!cros_ec_lpc_acpi_device_found)
platform_device_unregister(&cros_ec_lpc_device);
platform_driver_unregister(&cros_ec_lpc_driver);
cros_ec_lpc_reg_destroy();
}