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Message-ID: <8817cbdacccbed87a97e4efa35d45a1f08d78708.1479429347.git.eric.jeong@diasemi.com>
Date: Fri, 18 Nov 2016 09:35:47 +0900
From: Eric Jeong <eric.jeong.opensource@...semi.com>
To: Alexandre Courbot <gnurou@...il.com>,
LINUX-GPIO <linux-gpio@...r.kernel.org>,
LINUX-KERNEL <linux-kernel@...r.kernel.org>,
Linus Walleij <linus.walleij@...aro.org>
CC: DEVICETREE <devicetree@...r.kernel.org>,
Lee Jones <lee.jones@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>,
Support Opensource <support.opensource@...semi.com>
Subject: [PATCH V3 4/4] gpio: pv88080: Add GPIO function support
From: Eric Jeong <eric.jeong.opensource@...semi.com>
This patch adds support for PV88080 PMIC GPIOs.
PV88080 has two configurable GPIOs.
Kconfig and Makefile are updated to reflect support
for PV88080 PMIC GPIO.
Signed-off-by: Eric Jeong <eric.jeong.opensource@...semi.com>
---
This patch applies against linux-next and next-20161117
Hi,
Change since PATCH V2
- Add the set_single_ended function
- Add property reading function
- Simplify and clarfy the funcion of gpio_chip
Change since PATCH V1
- Patch separated from PATCH V1
Regards,
Eric Jeong, Dialog Semiconductor Ltd.
drivers/gpio/Kconfig | 11 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-pv88080.c | 213 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 225 insertions(+)
create mode 100644 drivers/gpio/gpio-pv88080.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a9a1c8a..cb11686 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -949,6 +949,17 @@ config GPIO_PALMAS
Select this option to enable GPIO driver for the TI PALMAS
series chip family.
+config GPIO_PV88080
+ tristate "Powerventure Semiconductor PV88080 GPIO"
+ depends on MFD_PV88080
+ help
+ Support for GPIO pins on PV88080 PMIC.
+
+ Say yes here to enable the GPIO driver for the PV88080 chip.
+
+ The Powerventure PMIC chip has 2 GPIO pins that can be
+ controlled by this driver.
+
config GPIO_RC5T583
bool "RICOH RC5T583 GPIO"
depends on MFD_RC5T583
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 8043a95..2a2311e 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
obj-$(CONFIG_GPIO_PISOSR) += gpio-pisosr.o
obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
+obj-$(CONFIG_GPIO_PV88080) += gpio-pv88080.o
obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
diff --git a/drivers/gpio/gpio-pv88080.c b/drivers/gpio/gpio-pv88080.c
new file mode 100644
index 0000000..6f4734f
--- /dev/null
+++ b/drivers/gpio/gpio-pv88080.c
@@ -0,0 +1,213 @@
+/*
+ * gpio-pv88080.c - GPIO device driver for PV88080
+ * Copyright (C) 2016 Powerventure Semiconductor Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/bitops.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/pv88080.h>
+
+#define PV88080_PORT_DIRECTION_INPUT 0
+#define PV88080_PORT_DIRECTION_OUTPUT 1
+
+struct pv88080_gpio {
+ struct pv88080 *chip;
+ struct gpio_chip gpio_chip;
+ unsigned int input_reg;
+ unsigned int output_reg;
+ unsigned int gpio_base_reg;
+};
+
+static int pv88080_gpio_get_direction(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct pv88080_gpio *priv = gpiochip_get_data(gc);
+ struct pv88080 *chip = priv->chip;
+ unsigned int value;
+ int ret;
+
+ ret = regmap_read(chip->regmap, priv->gpio_base_reg + offset, &value);
+ if (ret)
+ return ret;
+
+ value = !(value & PV88080_GPIO_DIRECTION_MASK);
+
+ return value;
+}
+
+static int pv88080_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct pv88080_gpio *priv = gpiochip_get_data(gc);
+ struct pv88080 *chip = priv->chip;
+
+ return regmap_update_bits(chip->regmap, priv->gpio_base_reg + offset,
+ PV88080_GPIO_DIRECTION_MASK, 0);
+}
+
+static int pv88080_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ struct pv88080_gpio *priv = gpiochip_get_data(gc);
+ struct pv88080 *chip = priv->chip;
+
+ return regmap_update_bits(chip->regmap, priv->gpio_base_reg + offset,
+ PV88080_GPIO_DIRECTION_MASK, 1);
+}
+
+static int pv88080_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct pv88080_gpio *priv = gpiochip_get_data(gc);
+ struct pv88080 *chip = priv->chip;
+ unsigned int reg, value;
+ int ret;
+
+ ret = regmap_read(chip->regmap, priv->gpio_base_reg + offset, &value);
+ if (ret < 0)
+ return ret;
+
+ if (value & PV88080_GPIO_DIRECTION_MASK)
+ reg = priv->output_reg;
+ else
+ reg = priv->input_reg;
+
+ ret = regmap_read(chip->regmap, reg, &value);
+ if (ret < 0)
+ return ret;
+
+ value = !!(value & BIT(offset));
+
+ return value;
+}
+
+static void pv88080_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct pv88080_gpio *priv = gpiochip_get_data(gc);
+ struct pv88080 *chip = priv->chip;
+ int ret;
+
+ ret = regmap_update_bits(chip->regmap, priv->output_reg,
+ BIT(offset), (value << offset));
+ if (ret < 0)
+ dev_err(chip->dev, "Failed to update gpio\n");
+}
+
+static int pv88080_set_single_ended(struct gpio_chip *gc,
+ unsigned int offset,
+ enum single_ended_mode mode)
+{
+ struct pv88080_gpio *priv = gpiochip_get_data(gc);
+ struct pv88080 *chip = priv->chip;
+ int ret;
+
+ switch (mode) {
+ case LINE_MODE_OPEN_DRAIN:
+ ret = regmap_update_bits(chip->regmap,
+ priv->gpio_base_reg + offset,
+ PV88080_GPIO_SINGLE_ENDED_MASK, 0);
+ break;
+ case LINE_MODE_PUSH_PULL:
+ ret = regmap_update_bits(chip->regmap,
+ priv->gpio_base_reg + offset,
+ PV88080_GPIO_SINGLE_ENDED_MASK, 1 << 1);
+ break;
+ default:
+ ret = -ENOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+static const struct gpio_chip template_gpio = {
+ .label = "pv88080-gpio",
+ .owner = THIS_MODULE,
+ .get_direction = pv88080_gpio_get_direction,
+ .direction_input = pv88080_gpio_direction_input,
+ .direction_output = pv88080_gpio_direction_output,
+ .get = pv88080_gpio_get,
+ .set = pv88080_gpio_set,
+ .set_single_ended = pv88080_set_single_ended,
+ .base = -1,
+ .ngpio = 2,
+};
+
+static const struct of_device_id pv88080_gpio_of_match[] = {
+ { .compatible = "pvs,pv88080-gpio", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pv88080_gpio_of_match);
+
+static int pv88080_gpio_probe(struct platform_device *pdev)
+{
+ struct pv88080 *chip = dev_get_drvdata(pdev->dev.parent);
+ struct pv88080_gpio *priv;
+ struct device_node *np = pdev->dev.of_node;
+ u32 ngpios;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev,
+ sizeof(struct pv88080_gpio), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->chip = chip;
+ priv->gpio_chip = template_gpio;
+ priv->gpio_chip.parent = &pdev->dev;
+
+ switch (chip->type) {
+ case TYPE_PV88080_AA:
+ priv->input_reg = PV88080AA_REG_GPIO_INPUT;
+ priv->output_reg = PV88080AA_REG_GPIO_OUTPUT;
+ priv->gpio_base_reg = PV88080AA_REG_GPIO_GPIO0;
+ break;
+ case TYPE_PV88080_BA:
+ priv->input_reg = PV88080BA_REG_GPIO_INPUT;
+ priv->output_reg = PV88080BA_REG_GPIO_OUTPUT;
+ priv->gpio_base_reg = PV88080BA_REG_GPIO_GPIO0;
+ break;
+ }
+
+ if (!of_property_read_u32(np, "ngpios", &ngpios))
+ priv->gpio_chip.ngpio = ngpios;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &priv->gpio_chip, priv);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Unable to register gpiochip\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+}
+
+static struct platform_driver pv88080_gpio_driver = {
+ .driver = {
+ .name = "pv88080-gpio",
+ .of_match_table = of_match_ptr(pv88080_gpio_of_match),
+ },
+ .probe = pv88080_gpio_probe,
+};
+module_platform_driver(pv88080_gpio_driver);
+
+MODULE_AUTHOR("Eric Jeong <eric.jeong.opensource@...semi.com>");
+MODULE_DESCRIPTION("GPIO device driver for Powerventure PV88080");
+MODULE_LICENSE("GPL");
+
--
end-of-patch for PATCH V3
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