diff options
| -rw-r--r-- | Documentation/ABI/testing/debugfs-wilco-ec | 13 | ||||
| -rw-r--r-- | drivers/platform/chrome/wilco_ec/debugfs.c | 47 |
2 files changed, 60 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/debugfs-wilco-ec b/Documentation/ABI/testing/debugfs-wilco-ec index 7ff6b45be703..73a5a66ddca6 100644 --- a/Documentation/ABI/testing/debugfs-wilco-ec +++ b/Documentation/ABI/testing/debugfs-wilco-ec @@ -1,3 +1,16 @@ +What: /sys/kernel/debug/wilco_ec/h1_gpio +Date: April 2019 +KernelVersion: 5.2 +Description: + As part of Chrome OS's FAFT (Fully Automated Firmware Testing) + tests, we need to ensure that the H1 chip is properly setting + some GPIO lines. The h1_gpio attribute exposes the state + of the lines: + - ENTRY_TO_FACT_MODE in BIT(0) + - SPI_CHROME_SEL in BIT(1) + + Output will formatted with "0x%02x\n". + What: /sys/kernel/debug/wilco_ec/raw Date: January 2019 KernelVersion: 5.1 diff --git a/drivers/platform/chrome/wilco_ec/debugfs.c b/drivers/platform/chrome/wilco_ec/debugfs.c index 8d307378c1cb..f163476d080d 100644 --- a/drivers/platform/chrome/wilco_ec/debugfs.c +++ b/drivers/platform/chrome/wilco_ec/debugfs.c @@ -164,6 +164,51 @@ static const struct file_operations fops_raw = { .llseek = no_llseek, }; +#define CMD_KB_CHROME 0x88 +#define SUB_CMD_H1_GPIO 0x0A + +struct h1_gpio_status_request { + u8 cmd; /* Always CMD_KB_CHROME */ + u8 reserved; + u8 sub_cmd; /* Always SUB_CMD_H1_GPIO */ +} __packed; + +struct hi_gpio_status_response { + u8 status; /* 0 if allowed */ + u8 val; /* BIT(0)=ENTRY_TO_FACT_MODE, BIT(1)=SPI_CHROME_SEL */ +} __packed; + +static int h1_gpio_get(void *arg, u64 *val) +{ + struct wilco_ec_device *ec = arg; + struct h1_gpio_status_request rq; + struct hi_gpio_status_response rs; + struct wilco_ec_message msg; + int ret; + + memset(&rq, 0, sizeof(rq)); + rq.cmd = CMD_KB_CHROME; + rq.sub_cmd = SUB_CMD_H1_GPIO; + + memset(&msg, 0, sizeof(msg)); + msg.type = WILCO_EC_MSG_LEGACY; + msg.request_data = &rq; + msg.request_size = sizeof(rq); + msg.response_data = &rs; + msg.response_size = sizeof(rs); + ret = wilco_ec_mailbox(ec, &msg); + if (ret < 0) + return ret; + if (rs.status) + return -EIO; + + *val = rs.val; + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(fops_h1_gpio, h1_gpio_get, NULL, "0x%02llx\n"); + /** * wilco_ec_debugfs_probe() - Create the debugfs node * @pdev: The platform device, probably created in core.c @@ -185,6 +230,8 @@ static int wilco_ec_debugfs_probe(struct platform_device *pdev) if (!debug_info->dir) return 0; debugfs_create_file("raw", 0644, debug_info->dir, NULL, &fops_raw); + debugfs_create_file("h1_gpio", 0444, debug_info->dir, ec, + &fops_h1_gpio); return 0; } |