| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpigen.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/mmio.h> |
| |
| #include "chip.h" |
| #include "ec.h" |
| #include "commands.h" |
| |
| static bool is_curve_valid(struct ec_clevo_it5570e_fan_curve curve) |
| { |
| /* |
| * Fan curve speeds have to be non-decreasing. |
| * Fan curve temperatures have to be increasing (to avoid division by 0). |
| * This also covers the case when the curve is all zeroes (i.e. not configured). |
| */ |
| |
| for (int i = 1; i < IT5570E_FAN_CURVE_LEN; i++) { |
| if (curve.speed[i] < curve.speed[i - 1] || |
| curve.temperature[i] <= curve.temperature[i - 1]) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static void write_fan_curve(struct ec_clevo_it5570e_fan_curve curve, int fan) |
| { |
| uint16_t ramp; |
| char fieldname[5]; |
| |
| /* Curve points */ |
| for (int i = 0; i < IT5570E_FAN_CURVE_LEN; i++) { |
| snprintf(fieldname, 5, "F%dT%d", fan + 1, i + 1); |
| acpigen_write_store_int_to_namestr(curve.temperature[i], fieldname); |
| snprintf(fieldname, 5, "F%dD%d", fan + 1, i + 1); |
| acpigen_write_store_int_to_namestr(curve.speed[i] * 255 / 100, fieldname); |
| } |
| |
| /* Ramps */ |
| for (int i = 0; i < (IT5570E_FAN_CURVE_LEN - 1); i++) { |
| ramp = 255 * 16 * |
| (curve.speed[i + 1] - curve.speed[i]) / |
| (curve.temperature[i + 1] - curve.temperature[i]) / |
| 100; |
| |
| snprintf(fieldname, 5, "F%dR%d", fan + 1, i + 1); |
| acpigen_write_store_int_to_namestr(ramp, fieldname); |
| } |
| } |
| |
| static void write_fan_opregion(int fan_cnt) |
| { |
| char fieldname[5]; |
| uint8_t flags = FIELD_ANYACC | FIELD_LOCK | FIELD_PRESERVE; |
| struct opregion opreg = { |
| .name = "FNCV", |
| .regionspace = SYSTEMMEMORY, |
| .regionoffset = CONFIG_EC_CLEVO_IT5570E_MEM_BASE + 0x38c, |
| .regionlen = fan_cnt * 14, |
| }; |
| |
| acpigen_write_opregion(&opreg); |
| acpigen_emit_ext_op(FIELD_OP); |
| acpigen_write_len_f(); |
| acpigen_emit_namestring(opreg.name); |
| acpigen_emit_byte(flags); |
| |
| for (int fan = 1; fan <= fan_cnt; fan++) { |
| /* temps */ |
| for (int i = 1; i <= IT5570E_FAN_CURVE_LEN; i++) { |
| snprintf(fieldname, 5, "F%dT%d", fan, i); |
| acpigen_write_field_name(fieldname, 8); |
| } |
| |
| /* duties */ |
| for (int i = 1; i <= IT5570E_FAN_CURVE_LEN; i++) { |
| snprintf(fieldname, 5, "F%dD%d", fan, i); |
| acpigen_write_field_name(fieldname, 8); |
| } |
| |
| /* ramps */ |
| for (int i = 1; i < IT5570E_FAN_CURVE_LEN; i++) { |
| snprintf(fieldname, 5, "F%dR%d", fan, i); |
| acpigen_write_field_name(fieldname, 16); |
| } |
| } |
| |
| acpigen_pop_len(); /* Field */ |
| } |
| |
| /* |
| * Set Fan curve |
| * The function must exist even if the fan curve isn't enabled in devicetree. |
| */ |
| void ec_fan_curve_fill_ssdt(const struct device *dev) |
| { |
| const ec_config_t *config = config_of(dev); |
| const int fan_cnt = read8p(ECRAM + FANC); |
| |
| acpigen_write_scope(acpi_device_path(dev)); |
| write_fan_opregion(fan_cnt); |
| acpigen_write_method("SFCV", 0); |
| |
| if (config->fan_mode == FAN_MODE_CUSTOM) { |
| int curve_cnt = 0; |
| |
| /* Check curve count against fan count from EC */ |
| for (int i = 0; i < IT5570E_MAX_FAN_CNT; i++) |
| if (*config->fan_curves[i].speed && *config->fan_curves[i].temperature) |
| curve_cnt++; |
| |
| if (curve_cnt != fan_cnt) { |
| printk(BIOS_WARNING, |
| "EC: Fan curve count (%d) does not match fan count (%d). " |
| "Check your devicetree!\n", curve_cnt, fan_cnt); |
| goto pop; |
| } |
| |
| /* |
| * Check all curves. |
| * Custom mode can only be enabled for all fans or none. Thus, all |
| * custom curves must be valid before custom mode can be enabled. |
| */ |
| bool error = false; |
| for (int i = 0; i < fan_cnt; i++) { |
| if (!is_curve_valid(config->fan_curves[i])) { |
| printk(BIOS_ERR, |
| "EC: Fan %d curve invalid. Check your devicetree!\n", i); |
| error = true; |
| } |
| } |
| if (error) |
| goto pop; |
| |
| acpigen_write_debug_string("EC: Apply custom fan curve"); |
| |
| for (int i = 0; i < fan_cnt; i++) |
| write_fan_curve(config->fan_curves[i], i); |
| |
| /* Enable custom fan mode */ |
| acpigen_write_store_int_to_namestr(0x04, "FDAT"); |
| acpigen_emit_namestring("SFCC"); |
| acpigen_write_integer(0xd7); |
| } |
| |
| pop: |
| acpigen_pop_len(); /* Method */ |
| acpigen_pop_len(); /* Scope */ |
| } |