On Sun, 14 Jul 2024, Matthias Fetzer wrote:
> Fan control on the E531 is done using the ACPI methods FANG and
> FANW. The correct parameters and register values were found by
> analyzing EC firmware as well as DSDT. This has been tested on
> my Thinkpad Edge E531 (6885CTO, BIOS HEET52WW 1.33).
>
> Signed-off-by: Matthias Fetzer <kontakt@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/platform/x86/thinkpad_acpi.c | 159 +++++++++++++++++++++++++++
> 1 file changed, 159 insertions(+)
>
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 397b409064c9..a171a2b39ac9 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -7751,6 +7751,28 @@ static struct ibm_struct volume_driver_data = {
> * EC 0x2f (HFSP) might be available *for reading*, but do not use
> * it for writing.
> *
> + * TPACPI_FAN_RD_ACPI_FANG:
> + * ACPI FANG method: returns fan control register
> + *
> + * Takes one parameter which is 0x8100 plus the offset to EC memory
> + * address 0xf500 and returns the byte at this address.
> + *
> + * 0xf500:
> + * When the value is less than 9 automatic mode is enabled
> + * 0xf502:
> + * Contains the current fan speed from 0-100%
> + * 0xf504:
> + * Bit 7 has to be set in order to enable manual control by
> + * writing a value >= 9 to 0xf500
> + *
> + * TPACPI_FAN_WR_ACPI_FANW:
> + * ACPI FANG method: sets fan control registers
> + *
> + * Takes 0x8100 plus the offset to EC memory address 0xf500 and the
> + * value to be written there as parameters.
> + *
> + * see TPACPI_FAN_RD_ACPI_FANG
> + *
> * TPACPI_FAN_WR_TPEC:
> * ThinkPad EC register 0x2f (HFSP): fan control loop mode
> * Supported on almost all ThinkPads
> @@ -7884,6 +7906,7 @@ enum { /* Fan control constants */
> enum fan_status_access_mode {
> TPACPI_FAN_NONE = 0, /* No fan status or control */
> TPACPI_FAN_RD_ACPI_GFAN, /* Use ACPI GFAN */
> + TPACPI_FAN_RD_ACPI_FANG, /* Use ACPI FANG */
> TPACPI_FAN_RD_TPEC, /* Use ACPI EC regs 0x2f, 0x84-0x85 */
> TPACPI_FAN_RD_TPEC_NS, /* Use non-standard ACPI EC regs (eg: L13 Yoga gen2 etc.) */
> };
> @@ -7891,6 +7914,7 @@ enum fan_status_access_mode {
> enum fan_control_access_mode {
> TPACPI_FAN_WR_NONE = 0, /* No fan control */
> TPACPI_FAN_WR_ACPI_SFAN, /* Use ACPI SFAN */
> + TPACPI_FAN_WR_ACPI_FANW, /* Use ACPI FANW */
> TPACPI_FAN_WR_TPEC, /* Use ACPI EC reg 0x2f */
> TPACPI_FAN_WR_ACPI_FANS, /* Use ACPI FANS and EC reg 0x2f */
> };
> @@ -7924,9 +7948,13 @@ TPACPI_HANDLE(fans, ec, "FANS"); /* X31, X40, X41 */
> TPACPI_HANDLE(gfan, ec, "GFAN", /* 570 */
> "\\FSPD", /* 600e/x, 770e, 770x */
> ); /* all others */
> +TPACPI_HANDLE(fang, ec, "FANG", /* E531 */
> + ); /* all others */
> TPACPI_HANDLE(sfan, ec, "SFAN", /* 570 */
> "JFNS", /* 770x-JL */
> ); /* all others */
> +TPACPI_HANDLE(fanw, ec, "FANW", /* E531 */
> + ); /* all others */
>
> /*
> * Unitialized HFSP quirk: ACPI DSDT and EC fail to initialize the
> @@ -8033,6 +8061,23 @@ static int fan_get_status(u8 *status)
>
> break;
> }
> + case TPACPI_FAN_RD_ACPI_FANG: {
> + /* E531 */
> + int mode, speed;
> +
> + if (unlikely(!acpi_evalf(fang_handle, &mode, NULL, "dd", 0x8100)))
> + return -EIO;
> + if (unlikely(!acpi_evalf(fang_handle, &speed, NULL, "dd", 0x8102)))
> + return -EIO;
> +
> + if (likely(status)) {
> + *status = speed * 7 / 100;
> + if (mode < 9)
> + *status |= TP_EC_FAN_AUTO;
> + }
> +
> + break;
> + }
> case TPACPI_FAN_RD_TPEC:
> /* all except 570, 600e/x, 770e, 770x */
> if (unlikely(!acpi_ec_read(fan_status_offset, &s)))
> @@ -8147,6 +8192,17 @@ static int fan2_get_speed(unsigned int *speed)
> if (speed)
> *speed = lo ? FAN_RPM_CAL_CONST / lo : 0;
> break;
> + case TPACPI_FAN_RD_ACPI_FANG: {
> + /* E531 */
> + int speed_tmp;
> +
> + if (unlikely(!acpi_evalf(fang_handle, &speed_tmp, NULL, "dd", 0x8102)))
> + return -EIO;
> +
> + if (likely(speed))
> + *speed = speed_tmp * 65535 / 100;
> + break;
> + }
>
> default:
> return -ENXIO;
> @@ -8157,6 +8213,7 @@ static int fan2_get_speed(unsigned int *speed)
>
> static int fan_set_level(int level)
> {
> + int rc;
> if (!fan_control_allowed)
> return -EPERM;
>
> @@ -8206,6 +8263,36 @@ static int fan_set_level(int level)
> tp_features.fan_ctrl_status_undef = 0;
> break;
>
> + case TPACPI_FAN_WR_ACPI_FANW:
> + if ((!(level & TP_EC_FAN_AUTO) &&
> + ((level < 0) || (level > 7))) ||
> + (level & TP_EC_FAN_FULLSPEED))
> + return -EINVAL;
I'd split this into two to make it more readable:
if (!(level & TP_EC_FAN_AUTO) && (level < 0 || level > 7))
return -EINVAL;
if (level & TP_EC_FAN_FULLSPEED)
return -EINVAL;
I'm not sure if -EINVAL is really the right code to return though in these
cases.
> + if (level & TP_EC_FAN_AUTO) {
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8106, 0x05)) {
Curiously enough, the comment above doesn't cover offset 0xf506 but the
comment mentions 0xf504 that is never touched anywhere? Is that a typo?
--
i.
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8100, 0x00)) {
> + rc = -EIO;
> + break;
> + }
> + } else {
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8106, 0x45)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8100, 0xff)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8102, level * 100 / 7)) {
> + rc = -EIO;
> + break;
> + }
> + }
> + break;
> +
> default:
> return -ENXIO;
> }
> @@ -8284,6 +8371,19 @@ static int fan_set_enable(void)
> rc = 0;
> break;
>
> + case TPACPI_FAN_WR_ACPI_FANW:
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8106, 0x05)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8100, 0x00)) {
> + rc = -EIO;
> + break;
> + }
> +
> + rc = 0;
> + break;
> +
> default:
> rc = -ENXIO;
> }
> @@ -8326,6 +8426,22 @@ static int fan_set_disable(void)
> fan_control_desired_level = 0;
> break;
>
> + case TPACPI_FAN_WR_ACPI_FANW:
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8106, 0x45)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8100, 0xff)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8102, 0x00)) {
> + rc = -EIO;
> + break;
> + }
> + rc = 0;
> + break;
> +
> default:
> rc = -ENXIO;
> }
> @@ -8359,6 +8475,23 @@ static int fan_set_speed(int speed)
> rc = -EINVAL;
> break;
>
> + case TPACPI_FAN_WR_ACPI_FANW:
> + if (speed >= 0 && speed <= 65535) {
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8106, 0x45)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd", 0x8100, 0xff)) {
> + rc = -EIO;
> + break;
> + }
> + if (!acpi_evalf(fanw_handle, NULL, NULL, "vdd",
> + 0x8102, speed * 100 / 65535))
> + rc = -EIO;
> + } else
> + rc = -EINVAL;
> + break;
> +
> default:
> rc = -ENXIO;
> }
> @@ -8701,6 +8834,10 @@ static int __init fan_init(struct ibm_init_struct *iibm)
> TPACPI_ACPIHANDLE_INIT(gfan);
> TPACPI_ACPIHANDLE_INIT(sfan);
> }
> + if (tpacpi_is_lenovo()) {
> + TPACPI_ACPIHANDLE_INIT(fang);
> + TPACPI_ACPIHANDLE_INIT(fanw);
> + }
>
> quirks = tpacpi_check_quirks(fan_quirk_table,
> ARRAY_SIZE(fan_quirk_table));
> @@ -8720,6 +8857,9 @@ static int __init fan_init(struct ibm_init_struct *iibm)
> if (gfan_handle) {
> /* 570, 600e/x, 770e, 770x */
> fan_status_access_mode = TPACPI_FAN_RD_ACPI_GFAN;
> + } else if (fang_handle) {
> + /* E531 */
> + fan_status_access_mode = TPACPI_FAN_RD_ACPI_FANG;
> } else {
> /* all other ThinkPads: note that even old-style
> * ThinkPad ECs supports the fan control register */
> @@ -8766,6 +8906,11 @@ static int __init fan_init(struct ibm_init_struct *iibm)
> fan_control_access_mode = TPACPI_FAN_WR_ACPI_SFAN;
> fan_control_commands |=
> TPACPI_FAN_CMD_LEVEL | TPACPI_FAN_CMD_ENABLE;
> + } else if (fanw_handle) {
> + /* E531 */
> + fan_control_access_mode = TPACPI_FAN_WR_ACPI_FANW;
> + fan_control_commands |=
> + TPACPI_FAN_CMD_LEVEL | TPACPI_FAN_CMD_SPEED | TPACPI_FAN_CMD_ENABLE;
> } else {
> if (!gfan_handle) {
> /* gfan without sfan means no fan control */
> @@ -8915,6 +9060,20 @@ static int fan_read(struct seq_file *m)
> str_enabled_disabled(status), status);
> break;
>
> + case TPACPI_FAN_RD_ACPI_FANG:
> + /* E531 */
> + rc = fan_get_status_safe(&status);
> + if (rc)
> + return rc;
> +
> + seq_printf(m, "status:\t\t%s\n", str_enabled_disabled(status));
> +
> + rc = fan_get_speed(&speed);
> + if (rc < 0)
> + return rc;
> + seq_printf(m, "speed:\t\t%d\n", speed);
> + break;
> +
> case TPACPI_FAN_RD_TPEC_NS:
> case TPACPI_FAN_RD_TPEC:
> /* all except 570, 600e/x, 770e, 770x */
>
