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Diffstat (limited to 'common/acpi.c')
| -rw-r--r-- | common/acpi.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/common/acpi.c b/common/acpi.c new file mode 100644 index 0000000000..942dd21dd2 --- /dev/null +++ b/common/acpi.c @@ -0,0 +1,132 @@ +/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "acpi.h" +#include "common.h" +#include "console.h" +#include "dptf.h" +#include "lpc.h" +#include "ec_commands.h" +#include "pwm.h" + +/* Console output macros */ +#define CPUTS(outstr) cputs(CC_LPC, outstr) +#define CPRINTF(format, args...) cprintf(CC_LPC, format, ## args) + +static uint8_t acpi_cmd; /* Last received ACPI command */ +static uint8_t acpi_addr; /* First byte of data after ACPI command */ +static int acpi_data_count; /* Number of data writes after command */ +static uint8_t acpi_mem_test; /* Test byte in ACPI memory space */ + +/* This handles AP writes to the EC via the ACPI I/O port. There are only a few + * ACPI commands (EC_CMD_ACPI_*), but they are all handled here. + */ +int acpi_ap_to_ec(int is_cmd, uint8_t value, uint8_t *resultptr) +{ + int data = 0; + int retval = 0; + + CPRINTF("[HEY: %T %s(%d, 0x%x)]\n", is_cmd, value); + + /* Read command/data; this clears the FRMH status bit. */ + if (is_cmd) { + acpi_cmd = value; + acpi_data_count = 0; + } else { + data = value; + /* + * The first data byte is the ACPI memory address for + * read/write commands. + */ + if (!acpi_data_count++) + acpi_addr = data; + } + + /* Process complete commands */ + if (acpi_cmd == EC_CMD_ACPI_READ && acpi_data_count == 1) { + /* ACPI read cmd + addr */ + int result = 0xff; /* value for bogus read */ + + switch (acpi_addr) { + case EC_ACPI_MEM_VERSION: + result = EC_ACPI_MEM_VERSION_CURRENT; + break; + case EC_ACPI_MEM_TEST: + result = acpi_mem_test; + break; + case EC_ACPI_MEM_TEST_COMPLIMENT: + result = 0xff - acpi_mem_test; + break; +#ifdef CONFIG_PWM_KBLIGHT + case EC_ACPI_MEM_KEYBOARD_BACKLIGHT: + /* + * TODO(crosbug.com/p/23774): not very satisfying that + * LPC knows directly about the keyboard backlight, but + * for now this is good enough and less code than + * defining a new API for ACPI commands. If we start + * adding more commands, or need to support LPC on more + * than just LM4, fix this. + */ + result = pwm_get_duty(PWM_CH_KBLIGHT); + break; +#endif +#ifdef CONFIG_FANS + case EC_ACPI_MEM_FAN_DUTY: + /** TODO(crosbug.com/p/23774): Fix this too */ + result = dptf_get_fan_duty_target(); + break; +#endif + default: + break; + } + + /* Send the result byte */ + CPRINTF("[%T ACPI read 0x%02x = 0x%02x]\n", acpi_addr, result); + *resultptr = result; + retval = 1; + + } else if (acpi_cmd == EC_CMD_ACPI_WRITE && acpi_data_count == 2) { + /* ACPI write cmd + addr + data */ + switch (acpi_addr) { + case EC_ACPI_MEM_TEST: + CPRINTF("[%T ACPI mem test 0x%02x]\n", data); + acpi_mem_test = data; + break; +#ifdef CONFIG_PWM_KBLIGHT + case EC_ACPI_MEM_KEYBOARD_BACKLIGHT: + /* + * Debug output with CR not newline, because the host + * does a lot of keyboard backlights and it scrolls the + * debug console. + */ + CPRINTF("\r[%T ACPI kblight %d]", data); + pwm_set_duty(PWM_CH_KBLIGHT, data); + break; +#endif +#ifdef CONFIG_FANS + case EC_ACPI_MEM_FAN_DUTY: + /** TODO(crosbug.com/p/23774): Fix this too */ + dptf_set_fan_duty_target(data); + break; +#endif + default: + CPRINTF("[%T ACPI write 0x%02x = 0x%02x]\n", + acpi_addr, data); + break; + } + +/* At the moment, ACPI implies LPC. */ +#ifdef CONFIG_LPC + } else if (acpi_cmd == EC_CMD_ACPI_QUERY_EVENT && !acpi_data_count) { + /* Clear and return the lowest host event */ + int evt_index = lpc_query_host_event_state(); + CPRINTF("[%T ACPI query = %d]\n", evt_index); + *resultptr = evt_index; + retval = 1; +#endif + } + + return retval; +} |