diff options
| author | Simon Glass | 2020-09-22 12:44:58 -0600 |
|---|---|---|
| committer | Bin Meng | 2020-09-25 11:27:14 +0800 |
| commit | 88490e197903f6961cf2ee79d0ff8f0727155f27 (patch) | |
| tree | 85ba227fc1fc17f47666a92c20c9844f40b0ce85 /lib/acpi/acpi_device.c | |
| parent | da7cff338f08cf43706a96bcd8cf398b7fb6ae2d (diff) | |
acpi: Support generating a multi-function _DSM for devices
Add a function to generate ACPI code for a _DSM method for a device.
This includes functions for starting and ending each part of the _DSM.
Signed-off-by: Simon Glass <sjg@chromium.org>
[bmeng: fix the "new blank line at EOF" git warning]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'lib/acpi/acpi_device.c')
| -rw-r--r-- | lib/acpi/acpi_device.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/acpi/acpi_device.c b/lib/acpi/acpi_device.c index 3c75b6d9629..8248664a10a 100644 --- a/lib/acpi/acpi_device.c +++ b/lib/acpi/acpi_device.c @@ -487,6 +487,49 @@ int acpi_device_add_power_res(struct acpi_ctx *ctx, u32 tx_state_val, return 0; } +int acpi_device_write_dsm_i2c_hid(struct acpi_ctx *ctx, + int hid_desc_reg_offset) +{ + int ret; + + acpigen_write_dsm_start(ctx); + ret = acpigen_write_dsm_uuid_start(ctx, ACPI_DSM_I2C_HID_UUID); + if (ret) + return log_ret(ret); + + acpigen_write_dsm_uuid_start_cond(ctx, 0); + /* ToInteger (Arg1, Local2) */ + acpigen_write_to_integer(ctx, ARG1_OP, LOCAL2_OP); + /* If (LEqual (Local2, 0x0)) */ + acpigen_write_if_lequal_op_int(ctx, LOCAL2_OP, 0x0); + /* Return (Buffer (One) { 0x1f }) */ + acpigen_write_return_singleton_buffer(ctx, 0x1f); + acpigen_pop_len(ctx); /* Pop : If */ + /* Else */ + acpigen_write_else(ctx); + /* If (LEqual (Local2, 0x1)) */ + acpigen_write_if_lequal_op_int(ctx, LOCAL2_OP, 0x1); + /* Return (Buffer (One) { 0x3f }) */ + acpigen_write_return_singleton_buffer(ctx, 0x3f); + acpigen_pop_len(ctx); /* Pop : If */ + /* Else */ + acpigen_write_else(ctx); + /* Return (Buffer (One) { 0x0 }) */ + acpigen_write_return_singleton_buffer(ctx, 0x0); + acpigen_pop_len(ctx); /* Pop : Else */ + acpigen_pop_len(ctx); /* Pop : Else */ + acpigen_write_dsm_uuid_end_cond(ctx); + + acpigen_write_dsm_uuid_start_cond(ctx, 1); + acpigen_write_return_byte(ctx, hid_desc_reg_offset); + acpigen_write_dsm_uuid_end_cond(ctx); + + acpigen_write_dsm_uuid_end(ctx); + acpigen_write_dsm_end(ctx); + + return 0; +} + /* ACPI 6.3 section 6.4.3.8.2.1 - I2cSerialBus() */ static void acpi_device_write_i2c(struct acpi_ctx *ctx, const struct acpi_i2c *i2c) |