ACPI / PMIC: Add opregion driver for Intel Dollar Cove TI PMIC

This patch adds the opregion driver for Dollar Cove TI PMIC on Intel
Cherry Trail devices.  The patch is based on the original work by
Intel, found at:
      https://github.com/01org/ProductionKernelQuilts
with many cleanups and rewrites.

The driver is currently provided only as built-in to follow other
PMIC opregion drivers convention.

The re-enumeration of devices at probe is required for fixing the
issues on HP x2 210 G2.  See bug#195689.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195689

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 144 insertions, 0 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 1ce52f84dc23..176fae699891 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -521,6 +521,12 @@ config CHT_WC_PMIC_OPREGION
         help
           This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
 
+config CHT_DC_TI_PMIC_OPREGION
+        bool "ACPI operation region support for Dollar Cove TI PMIC"
+        depends on INTEL_SOC_PMIC_CHTDC_TI
+        help
+          This config adds ACPI operation region support for Dollar Cove TI PMIC.
+
 endif
 
 config ACPI_CONFIGFS
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 90265ab4437a..21185613bc9b 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
 obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
 obj-$(CONFIG_BXT_WC_PMIC_OPREGION) += pmic/intel_pmic_bxtwc.o
 obj-$(CONFIG_CHT_WC_PMIC_OPREGION) += pmic/intel_pmic_chtwc.o
+obj-$(CONFIG_CHT_DC_TI_PMIC_OPREGION) += pmic/intel_pmic_chtdc_ti.o
 
 obj-$(CONFIG_ACPI_CONFIGFS)     += acpi_configfs.o
 
diff --git a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
new file mode 100644
index 000000000000..109c1e9c9c7a
--- /dev/null
+++ b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
@@ -0,0 +1,137 @@
+/*
+ * Dollar Cove TI PMIC operation region driver
+ * Copyright (C) 2014 Intel Corporation. All rights reserved.
+ *
+ * Rewritten and cleaned up
+ * Copyright (C) 2017 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/platform_device.h>
+#include "intel_pmic.h"
+
+/* registers stored in 16bit BE (high:low, total 10bit) */
+#define CHTDC_TI_VBAT           0x54
+#define CHTDC_TI_DIETEMP        0x56
+#define CHTDC_TI_BPTHERM        0x58
+#define CHTDC_TI_GPADC          0x5a
+
+static struct pmic_table chtdc_ti_power_table[] = {
+        { .address = 0x00, .reg = 0x41 },
+        { .address = 0x04, .reg = 0x42 },
+        { .address = 0x08, .reg = 0x43 },
+        { .address = 0x0c, .reg = 0x45 },
+        { .address = 0x10, .reg = 0x46 },
+        { .address = 0x14, .reg = 0x47 },
+        { .address = 0x18, .reg = 0x48 },
+        { .address = 0x1c, .reg = 0x49 },
+        { .address = 0x20, .reg = 0x4a },
+        { .address = 0x24, .reg = 0x4b },
+        { .address = 0x28, .reg = 0x4c },
+        { .address = 0x2c, .reg = 0x4d },
+        { .address = 0x30, .reg = 0x4e },
+};
+
+static struct pmic_table chtdc_ti_thermal_table[] = {
+        {
+                .address = 0x00,
+                .reg = CHTDC_TI_GPADC
+        },
+        {
+                .address = 0x0c,
+                .reg = CHTDC_TI_GPADC
+        },
+        /* TMP2 -> SYSTEMP */
+        {
+                .address = 0x18,
+                .reg = CHTDC_TI_GPADC
+        },
+        /* TMP3 -> BPTHERM */
+        {
+                .address = 0x24,
+                .reg = CHTDC_TI_BPTHERM
+        },
+        {
+                .address = 0x30,
+                .reg = CHTDC_TI_GPADC
+        },
+        /* TMP5 -> DIETEMP */
+        {
+                .address = 0x3c,
+                .reg = CHTDC_TI_DIETEMP
+        },
+};
+
+static int chtdc_ti_pmic_get_power(struct regmap *regmap, int reg, int bit,
+                                   u64 *value)
+{
+        int data;
+
+        if (regmap_read(regmap, reg, &data))
+                return -EIO;
+
+        *value = data & 1;
+        return 0;
+}
+
+static int chtdc_ti_pmic_update_power(struct regmap *regmap, int reg, int bit,
+                                      bool on)
+{
+        return regmap_update_bits(regmap, reg, 1, on);
+}
+
+static int chtdc_ti_pmic_get_raw_temp(struct regmap *regmap, int reg)
+{
+        u8 buf[2];
+
+        if (regmap_bulk_read(regmap, reg, buf, 2))
+                return -EIO;
+
+        /* stored in big-endian */
+        return ((buf[0] & 0x03) << 8) | buf[1];
+}
+
+static struct intel_pmic_opregion_data chtdc_ti_pmic_opregion_data = {
+        .get_power = chtdc_ti_pmic_get_power,
+        .update_power = chtdc_ti_pmic_update_power,
+        .get_raw_temp = chtdc_ti_pmic_get_raw_temp,
+        .power_table = chtdc_ti_power_table,
+        .power_table_count = ARRAY_SIZE(chtdc_ti_power_table),
+        .thermal_table = chtdc_ti_thermal_table,
+        .thermal_table_count = ARRAY_SIZE(chtdc_ti_thermal_table),
+};
+
+static int chtdc_ti_pmic_opregion_probe(struct platform_device *pdev)
+{
+        struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
+        int err;
+
+        err = intel_pmic_install_opregion_handler(&pdev->dev,
+                        ACPI_HANDLE(pdev->dev.parent), pmic->regmap,
+                        &chtdc_ti_pmic_opregion_data);
+        if (err < 0)
+                return err;
+
+        /* Re-enumerate devices depending on PMIC */
+        acpi_walk_dep_device_list(ACPI_HANDLE(pdev->dev.parent));
+        return 0;
+}
+
+static const struct platform_device_id chtdc_ti_pmic_opregion_id_table[] = {
+        { .name = "chtdc_ti_region" },
+        {},
+};
+
+static struct platform_driver chtdc_ti_pmic_opregion_driver = {
+        .probe = chtdc_ti_pmic_opregion_probe,
+        .driver = {
+                .name = "cht_dollar_cove_ti_pmic",
+        },
+        .id_table = chtdc_ti_pmic_opregion_id_table,
+};
+module_platform_driver(chtdc_ti_pmic_opregion_driver);
+
+MODULE_DESCRIPTION("Dollar Cove TI PMIC opregion driver");
+MODULE_LICENSE("GPL v2");