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Date:   Thu, 23 Nov 2017 17:13:11 +0000
From:   Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:     <lee.jones@...aro.org>, <broonie@...nel.org>,
        <linus.walleij@...aro.org>, <gnurou@...il.com>,
        <robh+dt@...nel.org>, <tglx@...utronix.de>, <jason@...edaemon.net>
CC:     <alsa-devel@...a-project.org>,
        <patches@...nsource.wolfsonmicro.com>,
        <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>,
        Nariman Poushin <nariman@...nsource.wolfsonmicro.com>,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Subject: [PATCH v6 12/17] gpio: madera: Support Cirrus Logic Madera class codecs

This adds support for the GPIOs on Cirrus Logic Madera class codecs.
Any pins not used for special functions (see the pinctrl driver) can be
used as general single-bit input or output lines. The number of available
GPIOs varies between codecs.

Signed-off-by: Nariman Poushin <nariman@...nsource.wolfsonmicro.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
 MAINTAINERS                |   1 +
 drivers/gpio/Kconfig       |   6 ++
 drivers/gpio/Makefile      |   1 +
 drivers/gpio/gpio-madera.c | 196 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 204 insertions(+)
 create mode 100644 drivers/gpio/gpio-madera.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 2c6772f81d88..7f3f2de4cc44 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3490,6 +3490,7 @@ F:	Documentation/devicetree/bindings/mfd/madera.txt
 F:	Documentation/devicetree/bindings/pinctrl/cirrus,madera-pinctrl.txt
 F:	include/linux/irqchip/irq-madera*
 F:	include/linux/mfd/madera/*
+F:	drivers/gpio/gpio-madera*
 F:	drivers/irqchip/irq-madera*
 F:	drivers/mfd/madera*
 F:	drivers/mfd/cs47l*
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d6a8e851ad13..95e4bbcf9bf7 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -993,6 +993,12 @@ config GPIO_LP87565
 	  This driver can also be built as a module. If so, the module will be
 	  called gpio-lp87565.
 
+config GPIO_MADERA
+	bool "Cirrus Logic Madera class codecs"
+	depends on PINCTRL_MADERA
+	help
+	  Support for GPIOs on Cirrus Logic Madera class codecs.
+
 config GPIO_MAX77620
 	tristate "GPIO support for PMIC MAX77620 and MAX20024"
 	depends on MFD_MAX77620
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 4bc24febb889..765125eb7d4c 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_ARCH_LPC32XX)	+= gpio-lpc32xx.o
 obj-$(CONFIG_GPIO_LP873X)	+= gpio-lp873x.o
 obj-$(CONFIG_GPIO_LP87565)	+= gpio-lp87565.o
 obj-$(CONFIG_GPIO_LYNXPOINT)	+= gpio-lynxpoint.o
+obj-$(CONFIG_GPIO_MADERA)	+= gpio-madera.o
 obj-$(CONFIG_GPIO_MAX3191X)	+= gpio-max3191x.o
 obj-$(CONFIG_GPIO_MAX730X)	+= gpio-max730x.o
 obj-$(CONFIG_GPIO_MAX7300)	+= gpio-max7300.o
diff --git a/drivers/gpio/gpio-madera.c b/drivers/gpio/gpio-madera.c
new file mode 100644
index 000000000000..e45905d59238
--- /dev/null
+++ b/drivers/gpio/gpio-madera.c
@@ -0,0 +1,196 @@
+/*
+ * GPIO support for Cirrus Logic Madera codecs
+ *
+ * Copyright 2015-2017 Cirrus Logic
+ *
+ * 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/device.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/madera/core.h>
+#include <linux/mfd/madera/pdata.h>
+#include <linux/mfd/madera/registers.h>
+
+struct madera_gpio {
+	struct madera *madera;
+	struct gpio_chip gpio_chip;
+};
+
+static int madera_gpio_get_direction(struct gpio_chip *chip,
+				     unsigned int offset)
+{
+	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
+	struct madera *madera = madera_gpio->madera;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(madera->regmap,
+			  MADERA_GPIO1_CTRL_2 + (2 * offset), &val);
+	if (ret < 0)
+		return ret;
+
+	return (val & MADERA_GP1_DIR_MASK) >> MADERA_GP1_DIR_SHIFT;
+}
+
+static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
+{
+	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
+	struct madera *madera = madera_gpio->madera;
+
+	return regmap_update_bits(madera->regmap,
+				  MADERA_GPIO1_CTRL_2 + (2 * offset),
+				  MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
+}
+
+static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
+	struct madera *madera = madera_gpio->madera;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(madera->regmap,
+			  MADERA_GPIO1_CTRL_1 + (2 * offset), &val);
+	if (ret < 0)
+		return ret;
+
+	return !!(val & MADERA_GP1_LVL_MASK);
+}
+
+static int madera_gpio_direction_out(struct gpio_chip *chip,
+				     unsigned int offset, int value)
+{
+	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
+	struct madera *madera = madera_gpio->madera;
+	unsigned int regval;
+	int ret;
+
+	if (value)
+		regval = MADERA_GP1_LVL;
+	else
+		regval = 0;
+
+	ret = regmap_update_bits(madera->regmap,
+				 MADERA_GPIO1_CTRL_2 + (2 * offset),
+				 MADERA_GP1_DIR_MASK, 0);
+	if (ret < 0)
+		return ret;
+
+	return regmap_update_bits(madera->regmap,
+				  MADERA_GPIO1_CTRL_1 + (2 * offset),
+				  MADERA_GP1_LVL_MASK, regval);
+}
+
+static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			    int value)
+{
+	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
+	struct madera *madera = madera_gpio->madera;
+	unsigned int regval;
+	int ret;
+
+	if (value)
+		regval = MADERA_GP1_LVL;
+	else
+		regval = 0;
+
+	ret = regmap_update_bits(madera->regmap,
+				 MADERA_GPIO1_CTRL_1 + (2 * offset),
+				 MADERA_GP1_LVL_MASK, regval);
+	if (ret)
+		dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
+			 MADERA_GPIO1_CTRL_1 + (2 * offset), ret);
+}
+
+static struct gpio_chip template_chip = {
+	.label			= "madera",
+	.owner			= THIS_MODULE,
+	.request		= gpiochip_generic_request,
+	.free			= gpiochip_generic_free,
+	.get_direction		= madera_gpio_get_direction,
+	.direction_input	= madera_gpio_direction_in,
+	.get			= madera_gpio_get,
+	.direction_output	= madera_gpio_direction_out,
+	.set			= madera_gpio_set,
+	.set_config		= gpiochip_generic_config,
+	.can_sleep		= true,
+};
+
+static int madera_gpio_probe(struct platform_device *pdev)
+{
+	struct madera *madera = dev_get_drvdata(pdev->dev.parent);
+	struct madera_pdata *pdata = dev_get_platdata(madera->dev);
+	struct madera_gpio *madera_gpio;
+	int ret;
+
+	madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio),
+				   GFP_KERNEL);
+	if (!madera_gpio)
+		return -ENOMEM;
+
+	madera_gpio->madera = madera;
+	madera_gpio->gpio_chip = template_chip;
+	madera_gpio->gpio_chip.parent = &pdev->dev;
+
+	if (IS_ENABLED(CONFIG_OF_GPIO))
+		madera_gpio->gpio_chip.of_node = madera->dev->of_node;
+
+	switch (madera->type) {
+	case CS47L35:
+		madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
+		break;
+	case CS47L85:
+	case WM1840:
+		madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
+		break;
+	case CS47L90:
+	case CS47L91:
+		madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
+		break;
+	default:
+		dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
+		return -EINVAL;
+	}
+
+	if (pdata && pdata->gpio_base)
+		madera_gpio->gpio_chip.base = pdata->gpio_base;
+	else
+		madera_gpio->gpio_chip.base = -1;
+
+	ret = devm_gpiochip_add_data(&pdev->dev, &madera_gpio->gpio_chip,
+				     madera_gpio);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+		return ret;
+	}
+
+	ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
+				     0, 0, madera_gpio->gpio_chip.ngpio);
+	if (ret) {
+		dev_warn(&pdev->dev, "Failed to add pin range (%d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver madera_gpio_driver = {
+	.driver.name	= "madera-gpio",
+	.driver.owner	= THIS_MODULE,
+	.probe		= madera_gpio_probe,
+};
+
+module_platform_driver(madera_gpio_driver);
+
+MODULE_DESCRIPTION("GPIO interface for Madera codecs");
+MODULE_AUTHOR("Nariman Poushin <nariman@...nsource.wolfsonmicro.com>");
+MODULE_AUTHOR("Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:madera-gpio");
-- 
2.11.0

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