1 files changed, 354 insertions, 0 deletions

diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
new file mode 100644
index 000000000000..a732e5d7e322
--- /dev/null
+++ b/drivers/acpi/pmic/intel_pmic.c
@@ -0,0 +1,354 @@
+/*
+ * intel_pmic.c - Intel PMIC operation region driver
+ *
+ * Copyright (C) 2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/regmap.h>
+#include "intel_pmic.h"
+
+#define PMIC_POWER_OPREGION_ID          0x8d
+#define PMIC_THERMAL_OPREGION_ID        0x8c
+
+struct acpi_lpat {
+        int temp;
+        int raw;
+};
+
+struct intel_pmic_opregion {
+        struct mutex lock;
+        struct acpi_lpat *lpat;
+        int lpat_count;
+        struct regmap *regmap;
+        struct intel_pmic_opregion_data *data;
+};
+
+static int pmic_get_reg_bit(int address, struct pmic_table *table,
+                            int count, int *reg, int *bit)
+{
+        int i;
+
+        for (i = 0; i < count; i++) {
+                if (table[i].address == address) {
+                        *reg = table[i].reg;
+                        if (bit)
+                                *bit = table[i].bit;
+                        return 0;
+                }
+        }
+        return -ENOENT;
+}
+
+/**
+ * raw_to_temp(): Return temperature from raw value through LPAT table
+ *
+ * @lpat: the temperature_raw mapping table
+ * @count: the count of the above mapping table
+ * @raw: the raw value, used as a key to get the temerature from the
+ *       above mapping table
+ *
+ * A positive value will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+static int raw_to_temp(struct acpi_lpat *lpat, int count, int raw)
+{
+        int i, delta_temp, delta_raw, temp;
+
+        for (i = 0; i < count - 1; i++) {
+                if ((raw >= lpat[i].raw && raw <= lpat[i+1].raw) ||
+                    (raw <= lpat[i].raw && raw >= lpat[i+1].raw))
+                        break;
+        }
+
+        if (i == count - 1)
+                return -ENOENT;
+
+        delta_temp = lpat[i+1].temp - lpat[i].temp;
+        delta_raw = lpat[i+1].raw - lpat[i].raw;
+        temp = lpat[i].temp + (raw - lpat[i].raw) * delta_temp / delta_raw;
+
+        return temp;
+}
+
+/**
+ * temp_to_raw(): Return raw value from temperature through LPAT table
+ *
+ * @lpat: the temperature_raw mapping table
+ * @count: the count of the above mapping table
+ * @temp: the temperature, used as a key to get the raw value from the
+ *        above mapping table
+ *
+ * A positive value will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+static int temp_to_raw(struct acpi_lpat *lpat, int count, int temp)
+{
+        int i, delta_temp, delta_raw, raw;
+
+        for (i = 0; i < count - 1; i++) {
+                if (temp >= lpat[i].temp && temp <= lpat[i+1].temp)
+                        break;
+        }
+
+        if (i == count - 1)
+                return -ENOENT;
+
+        delta_temp = lpat[i+1].temp - lpat[i].temp;
+        delta_raw = lpat[i+1].raw - lpat[i].raw;
+        raw = lpat[i].raw + (temp - lpat[i].temp) * delta_raw / delta_temp;
+
+        return raw;
+}
+
+static void pmic_thermal_lpat(struct intel_pmic_opregion *opregion,
+                              acpi_handle handle, struct device *dev)
+{
+        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+        union acpi_object *obj_p, *obj_e;
+        int *lpat, i;
+        acpi_status status;
+
+        status = acpi_evaluate_object(handle, "LPAT", NULL, &buffer);
+        if (ACPI_FAILURE(status))
+                return;
+
+        obj_p = (union acpi_object *)buffer.pointer;
+        if (!obj_p || (obj_p->type != ACPI_TYPE_PACKAGE) ||
+            (obj_p->package.count % 2) || (obj_p->package.count < 4))
+                goto out;
+
+        lpat = devm_kmalloc(dev, sizeof(int) * obj_p->package.count,
+                            GFP_KERNEL);
+        if (!lpat)
+                goto out;
+
+        for (i = 0; i < obj_p->package.count; i++) {
+                obj_e = &obj_p->package.elements[i];
+                if (obj_e->type != ACPI_TYPE_INTEGER) {
+                        devm_kfree(dev, lpat);
+                        goto out;
+                }
+                lpat[i] = (s64)obj_e->integer.value;
+        }
+
+        opregion->lpat = (struct acpi_lpat *)lpat;
+        opregion->lpat_count = obj_p->package.count / 2;
+
+out:
+        kfree(buffer.pointer);
+}
+
+static acpi_status intel_pmic_power_handler(u32 function,
+                acpi_physical_address address, u32 bits, u64 *value64,
+                void *handler_context, void *region_context)
+{
+        struct intel_pmic_opregion *opregion = region_context;
+        struct regmap *regmap = opregion->regmap;
+        struct intel_pmic_opregion_data *d = opregion->data;
+        int reg, bit, result;
+
+        if (bits != 32 || !value64)
+                return AE_BAD_PARAMETER;
+
+        if (function == ACPI_WRITE && !(*value64 == 0 || *value64 == 1))
+                return AE_BAD_PARAMETER;
+
+        result = pmic_get_reg_bit(address, d->power_table,
+                                  d->power_table_count, &reg, &bit);
+        if (result == -ENOENT)
+                return AE_BAD_PARAMETER;
+
+        mutex_lock(&opregion->lock);
+
+        result = function == ACPI_READ ?
+                d->get_power(regmap, reg, bit, value64) :
+                d->update_power(regmap, reg, bit, *value64 == 1);
+
+        mutex_unlock(&opregion->lock);
+
+        return result ? AE_ERROR : AE_OK;
+}
+
+static int pmic_read_temp(struct intel_pmic_opregion *opregion,
+                          int reg, u64 *value)
+{
+        int raw_temp, temp;
+
+        if (!opregion->data->get_raw_temp)
+                return -ENXIO;
+
+        raw_temp = opregion->data->get_raw_temp(opregion->regmap, reg);
+        if (raw_temp < 0)
+                return raw_temp;
+
+        if (!opregion->lpat) {
+                *value = raw_temp;
+                return 0;
+        }
+
+        temp = raw_to_temp(opregion->lpat, opregion->lpat_count, raw_temp);
+        if (temp < 0)
+                return temp;
+
+        *value = temp;
+        return 0;
+}
+
+static int pmic_thermal_temp(struct intel_pmic_opregion *opregion, int reg,
+                             u32 function, u64 *value)
+{
+        return function == ACPI_READ ?
+                pmic_read_temp(opregion, reg, value) : -EINVAL;
+}
+
+static int pmic_thermal_aux(struct intel_pmic_opregion *opregion, int reg,
+                            u32 function, u64 *value)
+{
+        int raw_temp;
+
+        if (function == ACPI_READ)
+                return pmic_read_temp(opregion, reg, value);
+
+        if (!opregion->data->update_aux)
+                return -ENXIO;
+
+        if (opregion->lpat) {
+                raw_temp = temp_to_raw(opregion->lpat, opregion->lpat_count,
+                                       *value);
+                if (raw_temp < 0)
+                        return raw_temp;
+        } else {
+                raw_temp = *value;
+        }
+
+        return opregion->data->update_aux(opregion->regmap, reg, raw_temp);
+}
+
+static int pmic_thermal_pen(struct intel_pmic_opregion *opregion, int reg,
+                            u32 function, u64 *value)
+{
+        struct intel_pmic_opregion_data *d = opregion->data;
+        struct regmap *regmap = opregion->regmap;
+
+        if (!d->get_policy || !d->update_policy)
+                return -ENXIO;
+
+        if (function == ACPI_READ)
+                return d->get_policy(regmap, reg, value);
+
+        if (*value != 0 && *value != 1)
+                return -EINVAL;
+
+        return d->update_policy(regmap, reg, *value);
+}
+
+static bool pmic_thermal_is_temp(int address)
+{
+        return (address <= 0x3c) && !(address % 12);
+}
+
+static bool pmic_thermal_is_aux(int address)
+{
+        return (address >= 4 && address <= 0x40 && !((address - 4) % 12)) ||
+               (address >= 8 && address <= 0x44 && !((address - 8) % 12));
+}
+
+static bool pmic_thermal_is_pen(int address)
+{
+        return address >= 0x48 && address <= 0x5c;
+}
+
+static acpi_status intel_pmic_thermal_handler(u32 function,
+                acpi_physical_address address, u32 bits, u64 *value64,
+                void *handler_context, void *region_context)
+{
+        struct intel_pmic_opregion *opregion = region_context;
+        struct intel_pmic_opregion_data *d = opregion->data;
+        int reg, result;
+
+        if (bits != 32 || !value64)
+                return AE_BAD_PARAMETER;
+
+        result = pmic_get_reg_bit(address, d->thermal_table,
+                                  d->thermal_table_count, &reg, NULL);
+        if (result == -ENOENT)
+                return AE_BAD_PARAMETER;
+
+        mutex_lock(&opregion->lock);
+
+        if (pmic_thermal_is_temp(address))
+                result = pmic_thermal_temp(opregion, reg, function, value64);
+        else if (pmic_thermal_is_aux(address))
+                result = pmic_thermal_aux(opregion, reg, function, value64);
+        else if (pmic_thermal_is_pen(address))
+                result = pmic_thermal_pen(opregion, reg, function, value64);
+        else
+                result = -EINVAL;
+
+        mutex_unlock(&opregion->lock);
+
+        if (result < 0) {
+                if (result == -EINVAL)
+                        return AE_BAD_PARAMETER;
+                else
+                        return AE_ERROR;
+        }
+
+        return AE_OK;
+}
+
+int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
+                                        struct regmap *regmap,
+                                        struct intel_pmic_opregion_data *d)
+{
+        acpi_status status;
+        struct intel_pmic_opregion *opregion;
+
+        if (!dev || !regmap || !d)
+                return -EINVAL;
+
+        if (!handle)
+                return -ENODEV;
+
+        opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL);
+        if (!opregion)
+                return -ENOMEM;
+
+        mutex_init(&opregion->lock);
+        opregion->regmap = regmap;
+        pmic_thermal_lpat(opregion, handle, dev);
+
+        status = acpi_install_address_space_handler(handle,
+                                                    PMIC_POWER_OPREGION_ID,
+                                                    intel_pmic_power_handler,
+                                                    NULL, opregion);
+        if (ACPI_FAILURE(status))
+                return -ENODEV;
+
+        status = acpi_install_address_space_handler(handle,
+                                                    PMIC_THERMAL_OPREGION_ID,
+                                                    intel_pmic_thermal_handler,
+                                                    NULL, opregion);
+        if (ACPI_FAILURE(status)) {
+                acpi_remove_address_space_handler(handle, PMIC_POWER_OPREGION_ID,
+                                                  intel_pmic_power_handler);
+                return -ENODEV;
+        }
+
+        opregion->data = d;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
+
+MODULE_LICENSE("GPL");