00e270fc8a
Changes:
SAM:
- Enable performance modes on Surface Laptop 1 and 2.
- Support for D0-exit/D0-entry notifications, sent to the SAM
controller when suspending (D0-exit) or resuming (D0-entry) on
newer (gen. 7+) devices.
- Replace sysfs-based debug device with new debugfs-based debug
device.
- More internal restructuring and internal API changes.
- Some small bug fixes.
SAM-over-HID:
- Add ACPI support for SAM-over-HID. This allows setting dGPU power
on the Surface Book 1 via ACPI calls.
Links:
- kernel: 91f5a27a55
- SAM: 89b8232d49
66 lines
1.8 KiB
Diff
66 lines
1.8 KiB
Diff
From 14bc7782c703218156fe5fd6b8df97a5f25f8d3e Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Sat, 25 Jul 2020 17:19:53 +0200
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Subject: [PATCH 4/6] surface-sam-over-hid
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---
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drivers/i2c/i2c-core-acpi.c | 35 +++++++++++++++++++++++++++++++++++
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1 file changed, 35 insertions(+)
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diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
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index ce70b5288472c..5df647c4d9a51 100644
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--- a/drivers/i2c/i2c-core-acpi.c
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+++ b/drivers/i2c/i2c-core-acpi.c
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@@ -582,6 +582,28 @@ static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
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return (ret == 1) ? 0 : -EIO;
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}
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+static int acpi_gsb_i2c_write_raw_bytes(struct i2c_client *client,
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+ u8 *data, u8 data_len)
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+{
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+ struct i2c_msg msgs[1];
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+ int ret = AE_OK;
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+
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+ msgs[0].addr = client->addr;
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+ msgs[0].flags = client->flags;
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+ msgs[0].len = data_len + 1;
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+ msgs[0].buf = data;
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+
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+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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+
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+ if (ret < 0) {
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+ dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
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+ return ret;
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+ }
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+
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+ /* 1 transfer must have completed successfully */
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+ return (ret == 1) ? 0 : -EIO;
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+}
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+
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static acpi_status
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i2c_acpi_space_handler(u32 function, acpi_physical_address command,
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u32 bits, u64 *value64,
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@@ -683,6 +705,19 @@ i2c_acpi_space_handler(u32 function, acpi_physical_address command,
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}
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break;
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+ case ACPI_GSB_ACCESS_ATTRIB_RAW_BYTES:
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+ if (action == ACPI_READ) {
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+ dev_warn(&adapter->dev,
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+ "protocol 0x%02x not supported for client 0x%02x\n",
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+ accessor_type, client->addr);
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+ ret = AE_BAD_PARAMETER;
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+ goto err;
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+ } else {
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+ status = acpi_gsb_i2c_write_raw_bytes(client,
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+ gsb->data, info->access_length);
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+ }
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+ break;
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+
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default:
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dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
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accessor_type, client->addr);
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--
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2.28.0
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