Date:   Fri, 2 Jun 2017 19:21:58 +0300
From:   Valentin Sitdikov <valentin_sitdikov@...tor.com>
To:     <lee.jones@...aro.org>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Andrei Dranitca <Andrei_Dranitca@...tor.com>,
        Valentin Sitdikov <valentin_sitdikov@...tor.com>
Subject: [PATCH 2/2] mfd: max7360: Add mfd core device driver

From: Andrei Dranitca <Andrei_Dranitca@...tor.com>

This patch adds core/IRQ driver to support MAX7360 I2C chip
which contains keypad, GPIO, PWM, GPO and rotary encoder submodules.

Signed-off-by: Andrei Dranitca <Andrei_Dranitca@...tor.com>
Signed-off-by: Valentin Sitdikov <valentin_sitdikov@...tor.com>
---
 drivers/mfd/Kconfig         |  16 +++
 drivers/mfd/Makefile        |   1 +
 drivers/mfd/max7360.c       | 302 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/max7360.h |  90 +++++++++++++
 4 files changed, 409 insertions(+)
 create mode 100644 drivers/mfd/max7360.c
 create mode 100644 include/linux/mfd/max7360.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3eb5c93..894c2e9 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -721,6 +721,22 @@ config MFD_MAX8998
 	  additional drivers must be enabled in order to use the functionality
 	  of the device.
 
+config MFD_MAX7360
+	tristate "Maxim Semiconductor MAX7360 support"
+	depends on I2C && OF
+	select MFD_CORE
+	select REGMAP_I2C
+	select IRQ_DOMAIN
+	help
+	  Say yes here to add support for Maxim Semiconductor MAX7360.
+	  This provides microprocessors with management of up to 64 key switches,
+	  with an additional eight LED drivers/GPIOs that feature constant-current,
+	  PWM intensity control, and rotary switch control options.
+
+	  This driver provides common support for accessing the device,
+	  additional drivers must be enabled in order to use the functionality
+	  of the device.
+
 config MFD_MT6397
 	tristate "MediaTek MT6397 PMIC Support"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c16bf1e..9e721c0 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -137,6 +137,7 @@ obj-$(CONFIG_MFD_DA9063)	+= da9063.o
 obj-$(CONFIG_MFD_DA9150)	+= da9150-core.o
 
 obj-$(CONFIG_MFD_MAX14577)	+= max14577.o
+obj-$(CONFIG_MFD_MAX7360)	+= max7360.o
 obj-$(CONFIG_MFD_MAX77620)	+= max77620.o
 obj-$(CONFIG_MFD_MAX77686)	+= max77686.o
 obj-$(CONFIG_MFD_MAX77693)	+= max77693.o
diff --git a/drivers/mfd/max7360.c b/drivers/mfd/max7360.c
new file mode 100644
index 0000000..2bfd3e2
--- /dev/null
+++ b/drivers/mfd/max7360.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (C) 2017 Mentor Graphics
+ *
+ * Author: Andrei Dranitca <Andrei_Dranitca@...tor.com>
+ * Author: Valentin Sitdikov <Valentin.Sitdikov@...tor.com>
+ *
+ * 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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max7360.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+
+
+static const struct mfd_cell max7360_devices[] = {
+	{
+		.name           = "max7360-gpio",
+		.of_compatible	= "maxim,max7360-gpio",
+	},
+	{
+		.name           = "max7360-keypad",
+		.of_compatible	= "maxim,max7360-keypad",
+	},
+	{
+		.name           = "max7360-pwm",
+		.of_compatible	= "maxim,max7360-pwm",
+	},
+	{
+		.name           = "max7360-rotary",
+		.of_compatible	= "maxim,max7360-rotary",
+	},
+};
+
+static irqreturn_t max7360_irq(int irq, void *data)
+{
+	struct max7360 *max7360 = data;
+	int virq;
+
+	virq = irq_find_mapping(max7360->domain, MAX7360_INT_GPIO);
+	handle_nested_irq(virq);
+	virq = irq_find_mapping(max7360->domain, MAX7360_INT_KEYPAD);
+	handle_nested_irq(virq);
+	virq = irq_find_mapping(max7360->domain, MAX7360_INT_ROTARY);
+	handle_nested_irq(virq);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t max7360_irqi(int irq, void *data)
+{
+	struct max7360 *max7360 = data;
+	int virq;
+
+	virq = irq_find_mapping(max7360->domain, MAX7360_INT_GPIO);
+	handle_nested_irq(virq);
+	virq = irq_find_mapping(max7360->domain, MAX7360_INT_ROTARY);
+	handle_nested_irq(virq);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t max7360_irqk(int irq, void *data)
+{
+	struct max7360 *max7360 = data;
+	int virq;
+
+	virq = irq_find_mapping(max7360->domain, MAX7360_INT_KEYPAD);
+	handle_nested_irq(virq);
+
+	return IRQ_HANDLED;
+}
+
+static int max7360_irq_map(struct irq_domain *d, unsigned int virq,
+			  irq_hw_number_t hwirq)
+{
+	struct max7360 *max7360 = d->host_data;
+
+	irq_set_chip_data(virq, max7360);
+	irq_set_chip_and_handler(virq, &dummy_irq_chip,
+				handle_edge_irq);
+	irq_set_nested_thread(virq, 1);
+	irq_set_noprobe(virq);
+
+	return 0;
+}
+
+static void max7360_irq_unmap(struct irq_domain *d, unsigned int virq)
+{
+	irq_set_chip_and_handler(virq, NULL, NULL);
+	irq_set_chip_data(virq, NULL);
+}
+
+static const struct irq_domain_ops max7360_irq_ops = {
+	.map    = max7360_irq_map,
+	.unmap  = max7360_irq_unmap,
+	.xlate  = irq_domain_xlate_onecell,
+};
+
+static void max7360_free_irqs(struct max7360 *max7360)
+{
+	if (max7360->shared_irq)
+		free_irq(max7360->shared_irq, max7360);
+	else {
+		free_irq(max7360->irq_inti, max7360);
+		free_irq(max7360->irq_intk, max7360);
+	}
+}
+
+static int max7360_irq_init(struct max7360 *max7360, struct device_node *np)
+{
+	int ret;
+
+	max7360->irq_inti = of_irq_get_byname(np, "inti");
+	if (max7360->irq_inti < 0) {
+		dev_err(max7360->dev, "no inti provided");
+		return -ENODEV;
+	}
+
+	max7360->irq_intk = of_irq_get_byname(np, "intk");
+	if (max7360->irq_intk < 0) {
+		dev_err(max7360->dev, "no intk provided");
+		return -ENODEV;
+	}
+
+	if (max7360->irq_inti == max7360->irq_intk) {
+		/*
+		 * In case of pin inti and pin intk are the connected
+		 * to the same soc`s irq pin.
+		 */
+		max7360->shared_irq = max7360->irq_inti;
+		ret = request_threaded_irq(max7360->shared_irq, NULL,
+					  max7360_irq,
+					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					  "max7360", max7360);
+		if (ret) {
+			dev_err(max7360->dev, "failed to request IRQ: %d\n",
+				ret);
+			return ret;
+		}
+	} else {
+		max7360->shared_irq = 0;
+		ret = request_threaded_irq(max7360->irq_inti, NULL,
+					  max7360_irqi,
+					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					  "max7360", max7360);
+		if (ret) {
+			dev_err(max7360->dev, "failed to request inti IRQ: %d\n",
+			       ret);
+			return ret;
+		}
+
+		ret = request_threaded_irq(max7360->irq_intk, NULL,
+					  max7360_irqk,
+					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					  "max7360", max7360);
+		if (ret) {
+			free_irq(max7360->irq_inti, max7360);
+			dev_err(max7360->dev, "failed to request intk IRQ: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	max7360->domain = irq_domain_add_simple(np, MAX7360_NR_INTERNAL_IRQS,
+					       0, &max7360_irq_ops, max7360);
+
+	if (!max7360->domain) {
+		max7360_free_irqs(max7360);
+		dev_err(max7360->dev, "Failed to create irqdomain\n");
+		return -ENODEV;
+	}
+
+	ret = irq_create_mapping(max7360->domain, MAX7360_INT_GPIO);
+	if (!ret) {
+		max7360_free_irqs(max7360);
+		dev_err(max7360->dev, "Failed to map GPIO IRQ\n");
+		return -EINVAL;
+	}
+
+	ret = irq_create_mapping(max7360->domain, MAX7360_INT_KEYPAD);
+	if (!ret) {
+		max7360_free_irqs(max7360);
+		dev_err(max7360->dev, "Failed to map KEYPAD IRQ\n");
+		return -EINVAL;
+	}
+
+	ret = irq_create_mapping(max7360->domain, MAX7360_INT_ROTARY);
+	if (!ret) {
+		max7360_free_irqs(max7360);
+		dev_err(max7360->dev, "Failed to map ROTARY IRQ\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+static int max7360_device_init(struct max7360 *max7360)
+{
+	int ret;
+
+	ret = mfd_add_devices(max7360->dev, PLATFORM_DEVID_NONE,
+			     max7360_devices,
+			     ARRAY_SIZE(max7360_devices), NULL,
+			     0, max7360->domain);
+	if (ret)
+		dev_err(max7360->dev, "failed to add child devices\n");
+
+	return ret;
+}
+
+static const struct regmap_range max7360_volatile_ranges[] = {
+	{
+		.range_min = MAX7360_REG_KEYFIFO,
+		.range_max = MAX7360_REG_KEYFIFO,
+	}, {
+		.range_min = MAX7360_REG_GPIOIN,
+		.range_max = MAX7360_REG_GPIOIN,
+	},
+};
+
+static const struct regmap_access_table max7360_volatile_table = {
+	.yes_ranges = max7360_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(max7360_volatile_ranges),
+};
+
+static const struct regmap_config max7360_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xff,
+	.volatile_table = &max7360_volatile_table,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static int max7360_probe(struct i2c_client *i2c,
+			const struct i2c_device_id *id)
+{
+	struct device_node *np = i2c->dev.of_node;
+	struct max7360 *max7360;
+	int ret;
+
+	max7360 = devm_kzalloc(&i2c->dev, sizeof(struct max7360),
+			      GFP_KERNEL);
+	if (!max7360)
+		return -ENOMEM;
+
+	max7360->dev = &i2c->dev;
+	max7360->i2c = i2c;
+
+	i2c_set_clientdata(i2c, max7360);
+
+	max7360->regmap = devm_regmap_init_i2c(i2c, &max7360_regmap_config);
+
+	ret = max7360_irq_init(max7360, np);
+	if (ret)
+		return ret;
+
+	ret = max7360_device_init(max7360);
+	if (ret) {
+		dev_err(max7360->dev, "failed to add child devices\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int max7360_remove(struct i2c_client *client)
+{
+	struct max7360 *max7360 = i2c_get_clientdata(client);
+
+	mfd_remove_devices(max7360->dev);
+
+	return 0;
+}
+
+static const struct of_device_id max7360_match[] = {
+	{ .compatible = "maxim,max7360" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max7360_match);
+
+static struct i2c_driver max7360_driver = {
+	.driver = {
+		.name	= "max7360",
+		.of_match_table = max7360_match,
+	},
+	.probe		= max7360_probe,
+	.remove		= max7360_remove,
+};
+
+builtin_i2c_driver(max7360_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MAX7360 MFD core driver");
diff --git a/include/linux/mfd/max7360.h b/include/linux/mfd/max7360.h
new file mode 100644
index 0000000..c350d5e
--- /dev/null
+++ b/include/linux/mfd/max7360.h
@@ -0,0 +1,90 @@
+#ifndef __LINUX_MFD_MAX7360_H
+#define __LINUX_MFD_MAX7360_H
+#include <linux/regmap.h>
+
+#define MAX7360_MAX_KEY_ROWS	8
+#define MAX7360_MAX_KEY_COLS	8
+#define MAX7360_MAX_KEY_NUM	(MAX7360_MAX_KEY_ROWS * MAX7360_MAX_KEY_COLS)
+#define MAX7360_ROW_SHIFT	3
+
+#define MAX7360_MAX_GPIO 8
+#define MAX7360_MAX_GPO 6
+#define MAX7360_COL_GPO_PINS 8
+/*
+ * MAX7360 registers
+ */
+#define MAX7360_REG_KEYFIFO	0x00
+#define MAX7360_REG_CONFIG	0x01
+#define MAX7360_REG_DEBOUNCE	0x02
+#define MAX7360_REG_INTERRUPT	0x03
+#define MAX7360_REG_PORTS	0x04
+#define MAX7360_REG_KEYREP	0x05
+#define MAX7360_REG_SLEEP	0x06
+
+/*
+ * MAX7360 registers
+ */
+#define MAX7360_REG_GPIOCFG	0x40
+#define MAX7360_REG_GPIOCTRL	0x41
+#define MAX7360_REG_GPIODEB	0x42
+#define MAX7360_REG_GPIOCURR	0x43
+#define MAX7360_REG_GPIOOUTM	0x44
+#define MAX7360_REG_PWMCOM	0x45
+#define MAX7360_REG_RTRCFG	0x46
+#define MAX7360_REG_GPIOIN	0x49
+#define MAX7360_REG_RTR_CNT	0x4A
+#define MAX7360_REG_PWMBASE	0x50
+#define MAX7360_REG_PWMCFG	0x58
+
+
+#define MAX7360_REG_PORTCFGBASE 0x58
+
+/*
+ * Configuration register bits
+ */
+#define MAX7360_CFG_SLEEP	BIT(7)
+#define MAX7360_CFG_INTERRUPT	BIT(5)
+#define MAX7360_CFG_KEY_RELEASE	BIT(3)
+#define MAX7360_CFG_WAKEUP	BIT(1)
+#define MAX7360_CFG_TIMEOUT	BIT(0)
+
+/*
+ * Autosleep register values (ms)
+ */
+#define MAX7360_AUTOSLEEP_8192	0x01
+#define MAX7360_AUTOSLEEP_4096	0x02
+#define MAX7360_AUTOSLEEP_2048	0x03
+#define MAX7360_AUTOSLEEP_1024	0x04
+#define MAX7360_AUTOSLEEP_512	0x05
+#define MAX7360_AUTOSLEEP_256	0x06
+
+#define MAX7360_INT_INTI	0
+#define MAX7360_INT_INTK	1
+
+#define MAX7360_INT_GPIO   0
+#define MAX7360_INT_KEYPAD 1
+#define MAX7360_INT_ROTARY 2
+
+#define MAX7360_NR_INTERNAL_IRQS	3
+
+/**
+ * struct max7360
+ * @dev: Parent device pointer
+ * @i2c: I2c client pointer
+ * @domain: Irq domain pointer
+ * @regmap: Used for I2C communication on accessing registers
+ * shared_irq: Irq number if inti and intk pins are connected together
+ * irq_inti: Irq number for inti pin
+ * irq_intk: Irq number for inik pin
+ */
+struct max7360 {
+	struct device *dev;
+	struct i2c_client *i2c;
+	struct irq_domain *domain;
+	struct regmap *regmap;
+
+	int shared_irq;
+	int irq_inti;
+	int irq_intk;
+};
+#endif
-- 
2.9.3

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