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Subject[PATCH 3/3] ACPI / PMIC: Add opregion driver for Intel Dollar Cove TI PMIC
Date
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>
---
drivers/acpi/Kconfig | 6 ++
drivers/acpi/Makefile | 1 +
drivers/acpi/pmic/intel_pmic_dc_ti.c | 135 +++++++++++++++++++++++++++++++++++
3 files changed, 142 insertions(+)
create mode 100644 drivers/acpi/pmic/intel_pmic_dc_ti.c

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 1ce52f84dc23..9da8dcefde7b 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 DC_TI_PMIC_OPREGION
+ bool "ACPI operation region support for Dollar Cove TI PMIC"
+ depends on INTEL_SOC_PMIC_DC_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 b1aacfc62b1f..0a9008b971af 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -103,6 +103,7 @@ 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_DC_TI_PMIC_OPREGION) += pmic/intel_pmic_dc_ti.o

obj-$(CONFIG_ACPI_CONFIGFS) += acpi_configfs.o

diff --git a/drivers/acpi/pmic/intel_pmic_dc_ti.c b/drivers/acpi/pmic/intel_pmic_dc_ti.c
new file mode 100644
index 000000000000..236ff31c5a79
--- /dev/null
+++ b/drivers/acpi/pmic/intel_pmic_dc_ti.c
@@ -0,0 +1,135 @@
+/*
+ * intel_pmic_dc_ti.c - TI Dollar Cove 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/init.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include "intel_pmic.h"
+
+#define TI_DC_PMICTEMP_LOW 0x57
+#define TI_DC_BATTEMP_LOW 0x59
+#define TI_DC_GPADC_LOW 0x5b
+
+static struct pmic_table dc_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 dc_ti_thermal_table[] = {
+ {
+ .address = 0x00,
+ .reg = TI_DC_GPADC_LOW
+ },
+ {
+ .address = 0x0c,
+ .reg = TI_DC_GPADC_LOW
+ },
+ /* TMP2 -> SYSTEMP */
+ {
+ .address = 0x18,
+ .reg = TI_DC_GPADC_LOW
+ },
+ /* TMP3 -> BATTEMP */
+ {
+ .address = 0x24,
+ .reg = TI_DC_BATTEMP_LOW
+ },
+ {
+ .address = 0x30,
+ .reg = TI_DC_GPADC_LOW
+ },
+ /* TMP5 -> PMICTEMP */
+ {
+ .address = 0x3c,
+ .reg = TI_DC_PMICTEMP_LOW
+ },
+};
+
+static int dc_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 dc_ti_pmic_update_power(struct regmap *regmap, int reg, int bit,
+ bool on)
+{
+ return regmap_update_bits(regmap, reg, 1, on);
+}
+
+static int dc_ti_pmic_get_raw_temp(struct regmap *regmap, int reg)
+{
+ int temp_l, temp_h;
+
+ if (regmap_read(regmap, reg, &temp_l) ||
+ regmap_read(regmap, reg - 1, &temp_h))
+ return -EIO;
+
+ return temp_l | (temp_h & 0x3) << 8;
+}
+
+static struct intel_pmic_opregion_data dc_ti_pmic_opregion_data = {
+ .get_power = dc_ti_pmic_get_power,
+ .update_power = dc_ti_pmic_update_power,
+ .get_raw_temp = dc_ti_pmic_get_raw_temp,
+ .power_table = dc_ti_power_table,
+ .power_table_count = ARRAY_SIZE(dc_ti_power_table),
+ .thermal_table = dc_ti_thermal_table,
+ .thermal_table_count = ARRAY_SIZE(dc_ti_thermal_table),
+};
+
+static int dc_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,
+ &dc_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 struct platform_device_id dc_ti_pmic_opregion_id_table[] = {
+ { .name = "dc_ti_region" },
+ {},
+};
+
+static struct platform_driver dc_ti_pmic_opregion_driver = {
+ .probe = dc_ti_pmic_opregion_probe,
+ .driver = {
+ .name = "dollar_cove_ti_pmic",
+ },
+ .id_table = dc_ti_pmic_opregion_id_table,
+};
+module_platform_driver(dc_ti_pmic_opregion_driver);
+
+MODULE_DESCRIPTION("Dollar Cove TI PMIC opregion driver");
+MODULE_LICENSE("GPLv2");
--
2.14.0
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