diff options
Diffstat (limited to 'drivers/platform/chrome/cros_ec_lpc.c')
-rw-r--r-- | drivers/platform/chrome/cros_ec_lpc.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c index 1baf720faf69..af89e82eecd2 100644 --- a/drivers/platform/chrome/cros_ec_lpc.c +++ b/drivers/platform/chrome/cros_ec_lpc.c @@ -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; @@ -54,7 +57,6 @@ static int ec_response_timed_out(void) static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec, struct cros_ec_command *msg) { - struct ec_host_request *request; struct ec_host_response response; u8 sum; int ret = 0; @@ -65,8 +67,6 @@ static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec, /* Write buffer */ cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_PACKET, ret, ec->dout); - request = (struct ec_host_request *)ec->dout; - /* Here we go */ sum = EC_COMMAND_PROTOCOL_3; cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_CMD, 1, &sum); @@ -362,6 +362,13 @@ static const struct dmi_system_id cros_ec_lpc_dmi_table[] __initconst = { DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"), }, }, + { + /* x86-glimmer, the Lenovo Thinkpad Yoga 11e. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Glimmer"), + }, + }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table); @@ -396,9 +403,21 @@ 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"); @@ -415,11 +434,28 @@ 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(); } |