[PATCH 2/2] mfd: max7360: Add mfd core device driver
From: Valentin Sitdikov
Date: Fri Jun 02 2017 - 12:22:46 EST
From: Andrei Dranitca <Andrei_Dranitca@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Valentin Sitdikov <valentin_sitdikov@xxxxxxxxxx>
---
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@xxxxxxxxxx>
+ * Author: Valentin Sitdikov <Valentin.Sitdikov@xxxxxxxxxx>
+ *
+ * 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