[PATCH 02/17] staging: nuc-wmi: detect WMI API detection
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Date: 2021-05-16 10:53:58
Also in:
linux-leds, lkml
Subsystem:
staging subsystem, the rest · Maintainers:
Greg Kroah-Hartman, Linus Torvalds
There are currently 3 known API releases:
- https://www.intel.com/content/www/us/en/support/articles/000023426/intel-nuc/intel-nuc-kits.html
- https://raw.githubusercontent.com/nomego/intel_nuc_led/master/specs/INTEL_WMI_LED_0.64.pdf
- https://www.intel.com/content/dam/support/us/en/documents/intel-nuc/WMI-Spec-Intel-NUC-NUC10ixFNx.pdf
Add a logic to detect between them, preventing the driver
to work with an unsupported version.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
drivers/staging/nuc-led/nuc-wmi.c | 30 +++++++++++++++++++++++++++---
1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/nuc-led/nuc-wmi.c b/drivers/staging/nuc-led/nuc-wmi.c
index 15d956ad8556..b75ddd47e443 100644
--- a/drivers/staging/nuc-led/nuc-wmi.c
+++ b/drivers/staging/nuc-led/nuc-wmi.c@@ -26,6 +26,13 @@ #define NUM_INPUT_ARGS 4 #define NUM_OUTPUT_ARGS 3 +enum led_api_rev { + LED_API_UNKNOWN, + LED_API_NUC6, + LED_API_REV_0_64, + LED_API_REV_1_0, +}; + enum led_cmds { LED_QUERY = 0x03, LED_NEW_GET_STATUS = 0x04,
@@ -33,6 +40,7 @@ enum led_cmds { LED_SET_VALUE = 0x06, LED_NOTIFICATION = 0x07, LED_SWITCH_TYPE = 0x08, + LED_VERSION_CONTROL = 0x09, }; enum led_query_subcmd {
@@ -195,7 +203,7 @@ static int nuc_wmi_query_leds(struct device *dev) struct nuc_wmi *priv = dev_get_drvdata(dev); u8 cmd, input[NUM_INPUT_ARGS] = { 0 }; u8 output[NUM_OUTPUT_ARGS]; - int i, id, ret; + int i, id, ret, ver = LED_API_UNKNOWN; u8 leds; /*
@@ -209,12 +217,28 @@ static int nuc_wmi_query_leds(struct device *dev) cmd = LED_QUERY; input[0] = LED_QUERY_LIST_ALL; ret = nuc_nmi_cmd(dev, cmd, input, output); - if (ret) { + if (ret == -ENOENT) { + ver = LED_API_NUC6; + } else if (ret) { dev_warn(dev, "error %d while listing all LEDs\n", ret); return ret; + } else { + leds = output[0]; } - leds = output[0]; + if (ver != LED_API_NUC6) { + ret = nuc_nmi_cmd(dev, LED_VERSION_CONTROL, input, output); + ver = output[0] | output[1] << 16; + if (!ver) + ver = LED_API_REV_0_64; + else if (ver == 0x0126) + ver = LED_API_REV_1_0; + } + + /* Currently, only API Revision 0.64 is supported */ + if (ver != LED_API_REV_0_64) + return -ENODEV; + if (!leds) { dev_warn(dev, "No LEDs found\n"); return -ENODEV;
--
2.31.1