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path: root/drivers/platform/x86/dell/dell-pc.c
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Diffstat (limited to 'drivers/platform/x86/dell/dell-pc.c')
-rw-r--r--drivers/platform/x86/dell/dell-pc.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/dell-pc.c b/drivers/platform/x86/dell/dell-pc.c
new file mode 100644
index 000000000000..48cc7511905a
--- /dev/null
+++ b/drivers/platform/x86/dell/dell-pc.c
@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Dell laptop extras
+ *
+ * Copyright (c) Lyndon Sanche <lsanche@lyndeno.ca>
+ *
+ * Based on documentation in the libsmbios package:
+ * Copyright (C) 2005-2014 Dell Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/bits.h>
+#include <linux/device/faux.h>
+#include <linux/dmi.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_profile.h>
+#include <linux/slab.h>
+
+#include "dell-smbios.h"
+
+static struct faux_device *dell_pc_fdev;
+static int supported_modes;
+
+static const struct dmi_system_id dell_device_table[] __initconst = {
+ {
+ .ident = "Dell Inc.",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ },
+ },
+ {
+ .ident = "Dell Computer Corporation",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+ },
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(dmi, dell_device_table);
+
+/* Derived from smbios-thermal-ctl
+ *
+ * cbClass 17
+ * cbSelect 19
+ * User Selectable Thermal Tables(USTT)
+ * cbArg1 determines the function to be performed
+ * cbArg1 0x0 = Get Thermal Information
+ * cbRES1 Standard return codes (0, -1, -2)
+ * cbRES2, byte 0 Bitmap of supported thermal modes. A mode is supported if
+ * its bit is set to 1
+ * Bit 0 Balanced
+ * Bit 1 Cool Bottom
+ * Bit 2 Quiet
+ * Bit 3 Performance
+ * cbRES2, byte 1 Bitmap of supported Active Acoustic Controller (AAC) modes.
+ * Each mode corresponds to the supported thermal modes in
+ * byte 0. A mode is supported if its bit is set to 1.
+ * Bit 0 AAC (Balanced)
+ * Bit 1 AAC (Cool Bottom
+ * Bit 2 AAC (Quiet)
+ * Bit 3 AAC (Performance)
+ * cbRes3, byte 0 Current Thermal Mode
+ * Bit 0 Balanced
+ * Bit 1 Cool Bottom
+ * Bit 2 Quiet
+ * Bit 3 Performanc
+ * cbRes3, byte 1 AAC Configuration type
+ * 0 Global (AAC enable/disable applies to all supported USTT modes)
+ * 1 USTT mode specific
+ * cbRes3, byte 2 Current Active Acoustic Controller (AAC) Mode
+ * If AAC Configuration Type is Global,
+ * 0 AAC mode disabled
+ * 1 AAC mode enabled
+ * If AAC Configuration Type is USTT mode specific (multiple bits may be set),
+ * Bit 0 AAC (Balanced)
+ * Bit 1 AAC (Cool Bottom
+ * Bit 2 AAC (Quiet)
+ * Bit 3 AAC (Performance)
+ * cbRes3, byte 3 Current Fan Failure Mode
+ * Bit 0 Minimal Fan Failure (at least one fan has failed, one fan working)
+ * Bit 1 Catastrophic Fan Failure (all fans have failed)
+ *
+ * cbArg1 0x1 (Set Thermal Information), both desired thermal mode and
+ * desired AAC mode shall be applied
+ * cbArg2, byte 0 Desired Thermal Mode to set
+ * (only one bit may be set for this parameter)
+ * Bit 0 Balanced
+ * Bit 1 Cool Bottom
+ * Bit 2 Quiet
+ * Bit 3 Performance
+ * cbArg2, byte 1 Desired Active Acoustic Controller (AAC) Mode to set
+ * If AAC Configuration Type is Global,
+ * 0 AAC mode disabled
+ * 1 AAC mode enabled
+ * If AAC Configuration Type is USTT mode specific
+ * (multiple bits may be set for this parameter),
+ * Bit 0 AAC (Balanced)
+ * Bit 1 AAC (Cool Bottom
+ * Bit 2 AAC (Quiet)
+ * Bit 3 AAC (Performance)
+ */
+
+#define DELL_ACC_GET_FIELD GENMASK(19, 16)
+#define DELL_ACC_SET_FIELD GENMASK(11, 8)
+#define DELL_THERMAL_SUPPORTED GENMASK(3, 0)
+
+enum thermal_mode_bits {
+ DELL_BALANCED = BIT(0),
+ DELL_COOL_BOTTOM = BIT(1),
+ DELL_QUIET = BIT(2),
+ DELL_PERFORMANCE = BIT(3),
+};
+
+static int thermal_get_mode(void)
+{
+ struct calling_interface_buffer buffer;
+ int state;
+ int ret;
+
+ dell_fill_request(&buffer, 0x0, 0, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ if (ret)
+ return ret;
+ state = buffer.output[2];
+ if (state & DELL_BALANCED)
+ return DELL_BALANCED;
+ else if (state & DELL_COOL_BOTTOM)
+ return DELL_COOL_BOTTOM;
+ else if (state & DELL_QUIET)
+ return DELL_QUIET;
+ else if (state & DELL_PERFORMANCE)
+ return DELL_PERFORMANCE;
+ else
+ return -ENXIO;
+}
+
+static int thermal_get_supported_modes(int *supported_bits)
+{
+ struct calling_interface_buffer buffer;
+ int ret;
+
+ dell_fill_request(&buffer, 0x0, 0, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ if (ret)
+ return ret;
+ *supported_bits = FIELD_GET(DELL_THERMAL_SUPPORTED, buffer.output[1]);
+ return 0;
+}
+
+static int thermal_get_acc_mode(int *acc_mode)
+{
+ struct calling_interface_buffer buffer;
+ int ret;
+
+ dell_fill_request(&buffer, 0x0, 0, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ if (ret)
+ return ret;
+ *acc_mode = FIELD_GET(DELL_ACC_GET_FIELD, buffer.output[3]);
+ return 0;
+}
+
+static int thermal_set_mode(enum thermal_mode_bits state)
+{
+ struct calling_interface_buffer buffer;
+ int ret;
+ int acc_mode;
+
+ ret = thermal_get_acc_mode(&acc_mode);
+ if (ret)
+ return ret;
+
+ dell_fill_request(&buffer, 0x1, FIELD_PREP(DELL_ACC_SET_FIELD, acc_mode) | state, 0, 0);
+ return dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+}
+
+static int thermal_platform_profile_set(struct device *dev,
+ enum platform_profile_option profile)
+{
+ switch (profile) {
+ case PLATFORM_PROFILE_BALANCED:
+ return thermal_set_mode(DELL_BALANCED);
+ case PLATFORM_PROFILE_PERFORMANCE:
+ return thermal_set_mode(DELL_PERFORMANCE);
+ case PLATFORM_PROFILE_QUIET:
+ return thermal_set_mode(DELL_QUIET);
+ case PLATFORM_PROFILE_COOL:
+ return thermal_set_mode(DELL_COOL_BOTTOM);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int thermal_platform_profile_get(struct device *dev,
+ enum platform_profile_option *profile)
+{
+ int ret;
+
+ ret = thermal_get_mode();
+ if (ret < 0)
+ return ret;
+
+ switch (ret) {
+ case DELL_BALANCED:
+ *profile = PLATFORM_PROFILE_BALANCED;
+ break;
+ case DELL_PERFORMANCE:
+ *profile = PLATFORM_PROFILE_PERFORMANCE;
+ break;
+ case DELL_COOL_BOTTOM:
+ *profile = PLATFORM_PROFILE_COOL;
+ break;
+ case DELL_QUIET:
+ *profile = PLATFORM_PROFILE_QUIET;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int thermal_platform_profile_probe(void *drvdata, unsigned long *choices)
+{
+ if (supported_modes & DELL_QUIET)
+ __set_bit(PLATFORM_PROFILE_QUIET, choices);
+ if (supported_modes & DELL_COOL_BOTTOM)
+ __set_bit(PLATFORM_PROFILE_COOL, choices);
+ if (supported_modes & DELL_BALANCED)
+ __set_bit(PLATFORM_PROFILE_BALANCED, choices);
+ if (supported_modes & DELL_PERFORMANCE)
+ __set_bit(PLATFORM_PROFILE_PERFORMANCE, choices);
+
+ return 0;
+}
+
+static const struct platform_profile_ops dell_pc_platform_profile_ops = {
+ .probe = thermal_platform_profile_probe,
+ .profile_get = thermal_platform_profile_get,
+ .profile_set = thermal_platform_profile_set,
+};
+
+static int dell_pc_faux_probe(struct faux_device *fdev)
+{
+ struct device *ppdev;
+ int ret;
+
+ if (!dell_smbios_class_is_supported(CLASS_INFO))
+ return -ENODEV;
+
+ ret = thermal_get_supported_modes(&supported_modes);
+ if (ret < 0)
+ return ret;
+
+ ppdev = devm_platform_profile_register(&fdev->dev, "dell-pc", NULL,
+ &dell_pc_platform_profile_ops);
+
+ return PTR_ERR_OR_ZERO(ppdev);
+}
+
+static const struct faux_device_ops dell_pc_faux_ops = {
+ .probe = dell_pc_faux_probe,
+};
+
+static int __init dell_init(void)
+{
+ if (!dmi_check_system(dell_device_table))
+ return -ENODEV;
+
+ dell_pc_fdev = faux_device_create("dell-pc", NULL, &dell_pc_faux_ops);
+ if (!dell_pc_fdev)
+ return -ENODEV;
+
+ return 0;
+}
+
+static void __exit dell_exit(void)
+{
+ faux_device_destroy(dell_pc_fdev);
+}
+
+module_init(dell_init);
+module_exit(dell_exit);
+
+MODULE_AUTHOR("Lyndon Sanche <lsanche@lyndeno.ca>");
+MODULE_DESCRIPTION("Dell PC driver");
+MODULE_LICENSE("GPL");