[PATCH v2 1/3] mfd: Add support for Cherry Trail Dollar Cove TI PMIC

[Takashi Iwai <tiwai@suse.de>]

This patch adds the MFD driver for Dollar Cove TI PMIC (ACPI INT33F5)
that is found on some Intel Cherry Trail devices.
The driver is based on the original work by Intel, found at:
  https://github.com/01org/ProductionKernelQuilts

This is a minimal version for adding the basic resources.  Currently,
only ACPI PMIC opregion and the external power-button are used.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
v1->v2:
* Minor cleanups as suggested by Andy

 drivers/mfd/Kconfig                |  13 +++
 drivers/mfd/Makefile               |   1 +
 drivers/mfd/intel_soc_pmic_dc_ti.c | 182 +++++++++++++++++++++++++++++++++++++
 3 files changed, 196 insertions(+)
 create mode 100644 drivers/mfd/intel_soc_pmic_dc_ti.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 94ad2c1c3d90..28c12bb50c9f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -496,6 +496,19 @@ config INTEL_SOC_PMIC_CHTWC
 	  available before any devices using it are probed. This option also
 	  causes the designware-i2c driver to be builtin for the same reason.
 
+config INTEL_SOC_PMIC_DC_TI
+	tristate "Support for Dollar Cove TI PMIC"
+	depends on GPIOLIB
+	depends on I2C
+	depends on ACPI
+	depends on X86
+	select MFD_CORE
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	help
+	  Select this option for supporting Dollar Cove TI PMIC device that is
+	  found on some Intel Cherry Trail systems.
+
 config MFD_INTEL_LPSS
 	tristate
 	select COMMON_CLK
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 080793b3fd0e..16c4fe519d30 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -216,6 +216,7 @@ intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
 obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC)	+= intel_soc_pmic_bxtwc.o
 obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
+obj-$(CONFIG_INTEL_SOC_PMIC_DC_TI)	+= intel_soc_pmic_dc_ti.o
 obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
 
 obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o
diff --git a/drivers/mfd/intel_soc_pmic_dc_ti.c b/drivers/mfd/intel_soc_pmic_dc_ti.c
new file mode 100644
index 000000000000..3ba1625eb44b
--- /dev/null
+++ b/drivers/mfd/intel_soc_pmic_dc_ti.c
@@ -0,0 +1,182 @@
+/*
+ * Device access for Dollar Cove TI PMIC
+ * Copyright (c) 2014, Intel Corporation.
+ *   Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
+ *
+ * Cleanup and forward-ported
+ *   Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel_soc_pmic.h>
+
+#define DC_TI_IRQLVL1		0x01
+#define DC_TI_MASK_IRQLVL1	0x02
+
+/* Level 1 IRQs */
+enum {
+	DC_TI_PWRBTN = 0,	/* power button */
+	DC_TI_DIETMPWARN,	/* thermal */
+	DC_TI_ADCCMPL,		/* ADC */
+	/* no irq 3 */
+	DC_TI_VBATLOW = 4,	/* battery */
+	DC_TI_VBUSDET,		/* power source */
+	/* no irq 6 */
+	DC_TI_CCEOCAL = 7,	/* battery */
+};
+
+static struct resource power_button_resources[] = {
+	DEFINE_RES_IRQ(DC_TI_PWRBTN),
+};
+
+static struct resource thermal_resources[] = {
+	DEFINE_RES_IRQ(DC_TI_DIETMPWARN),
+};
+
+static struct resource adc_resources[] = {
+	DEFINE_RES_IRQ(DC_TI_ADCCMPL),
+};
+
+static struct resource pwrsrc_resources[] = {
+	DEFINE_RES_IRQ(DC_TI_VBUSDET),
+};
+
+static struct resource battery_resources[] = {
+	DEFINE_RES_IRQ(DC_TI_VBATLOW),
+	DEFINE_RES_IRQ(DC_TI_CCEOCAL),
+};
+
+static struct mfd_cell dc_ti_dev[] = {
+	{
+		.name = "dc_ti_pwrbtn",
+		.num_resources = ARRAY_SIZE(power_button_resources),
+		.resources = power_button_resources,
+	},
+	{
+		.name = "dc_ti_adc",
+		.num_resources = ARRAY_SIZE(adc_resources),
+		.resources = adc_resources,
+	},
+	{
+		.name = "dc_ti_thermal",
+		.num_resources = ARRAY_SIZE(thermal_resources),
+		.resources = thermal_resources,
+	},
+	{
+		.name = "dc_ti_pwrsrc",
+		.num_resources = ARRAY_SIZE(pwrsrc_resources),
+		.resources = pwrsrc_resources,
+	},
+	{
+		.name = "dc_ti_battery",
+		.num_resources = ARRAY_SIZE(battery_resources),
+		.resources = battery_resources,
+	},
+	{
+		.name = "dc_ti_region",
+	},
+};
+
+static const struct regmap_config dc_ti_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 128,
+	.cache_type = REGCACHE_NONE,
+};
+
+static const struct regmap_irq dc_ti_irqs[] = {
+	REGMAP_IRQ_REG(DC_TI_PWRBTN, 0, BIT(DC_TI_PWRBTN)),
+	REGMAP_IRQ_REG(DC_TI_DIETMPWARN, 0, BIT(DC_TI_DIETMPWARN)),
+	REGMAP_IRQ_REG(DC_TI_ADCCMPL, 0, BIT(DC_TI_ADCCMPL)),
+	REGMAP_IRQ_REG(DC_TI_VBATLOW, 0, BIT(DC_TI_VBATLOW)),
+	REGMAP_IRQ_REG(DC_TI_VBUSDET, 0, BIT(DC_TI_VBUSDET)),
+	REGMAP_IRQ_REG(DC_TI_CCEOCAL, 0, BIT(DC_TI_CCEOCAL)),
+};
+
+static const struct regmap_irq_chip dc_ti_irq_chip = {
+	.name = KBUILD_MODNAME,
+	.irqs = dc_ti_irqs,
+	.num_irqs = ARRAY_SIZE(dc_ti_irqs),
+	.num_regs = 1,
+	.status_base = DC_TI_IRQLVL1,
+	.mask_base = DC_TI_MASK_IRQLVL1,
+	.ack_base = DC_TI_IRQLVL1,
+};
+
+static int dc_ti_probe(struct i2c_client *i2c)
+{
+	struct device *dev = &i2c->dev;
+	struct intel_soc_pmic *pmic;
+	int ret;
+
+	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
+	if (!pmic)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, pmic);
+
+	pmic->regmap = devm_regmap_init_i2c(i2c, &dc_ti_regmap_config);
+	if (IS_ERR(pmic->regmap))
+		return PTR_ERR(pmic->regmap);
+	pmic->irq = i2c->irq;
+
+	ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
+				       IRQF_ONESHOT, 0,
+				       &dc_ti_irq_chip, &pmic->irq_chip_data);
+	if (ret)
+		return ret;
+
+	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, dc_ti_dev,
+				    ARRAY_SIZE(dc_ti_dev), NULL, 0,
+				    regmap_irq_get_domain(pmic->irq_chip_data));
+}
+
+static void dc_ti_shutdown(struct i2c_client *i2c)
+{
+	struct intel_soc_pmic *pmic = i2c_get_clientdata(i2c);
+
+	disable_irq(pmic->irq);
+}
+
+static int __maybe_unused dc_ti_suspend(struct device *dev)
+{
+	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
+
+	disable_irq(pmic->irq);
+	return 0;
+}
+
+static int __maybe_unused dc_ti_resume(struct device *dev)
+{
+	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
+
+	enable_irq(pmic->irq);
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(dc_ti_pm_ops, dc_ti_suspend, dc_ti_resume);
+
+static const struct acpi_device_id dc_ti_acpi_ids[] = {
+	{ "INT33F5" },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, dc_ti_acpi_ids);
+
+static struct i2c_driver dc_ti_i2c_driver = {
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.pm = &dc_ti_pm_ops,
+		.acpi_match_table = dc_ti_acpi_ids,
+	},
+	.probe_new = dc_ti_probe,
+	.shutdown = dc_ti_shutdown,
+};
+module_i2c_driver(dc_ti_i2c_driver);
+
+MODULE_DESCRIPTION("I2C driver for Intel SoC Dollar Cove TI PMIC");
+MODULE_LICENSE("GPL v2");
-- 
2.14.0