[PATCH 3/4] gpio: Kontron PLD gpio driver
From: Kevin Strasser
Date: Mon Apr 08 2013 - 13:18:55 EST
From: Michael Brunner <michael.brunner@xxxxxxxxxxx>
Add gpio support for the on-board PLD found on some Kontron embedded
modules.
Signed-off-by: Michael Brunner <michael.brunner@xxxxxxxxxxx>
Signed-off-by: Kevin Strasser <kevin.strasser@xxxxxxxxxxxxxxx>
---
drivers/gpio/Kconfig | 22 ++
drivers/gpio/Makefile | 2 +
drivers/gpio/gpio-kempld.c | 476 +++++++++++++++++++++++++++++++++++++++
drivers/gpio/gpio-kempld.h | 50 ++++
drivers/gpio/gpio-kempld_now1.c | 280 +++++++++++++++++++++++
5 files changed, 830 insertions(+)
create mode 100644 drivers/gpio/gpio-kempld.c
create mode 100644 drivers/gpio/gpio-kempld.h
create mode 100644 drivers/gpio/gpio-kempld_now1.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 93aaadf..88e1bc9 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -658,6 +658,28 @@ config GPIO_UCB1400
This enables support for the Philips UCB1400 GPIO pins.
The UCB1400 is an AC97 audio codec.
+comment "LPC GPIO expanders:"
+
+config GPIO_KEMPLD
+ tristate "Kontron COM GPIO"
+ depends on MFD_KEMPLD
+ help
+ This enables support for the PLD GPIO interface on some Kontron ETX
+ and COMexpress (ETXexpress) modules.
+
+ This driver can also be built as a module. If so, the module will
+ be called gpio-kempld.
+
+config GPIO_NOW1_KEMPLD
+ tristate "Kontron COMe-mSP1 (nanoETXexpress-SP) GPIO"
+ depends on MFD_KEMPLD
+ help
+ This enables support for the PLD GPIO interface on the Kontron
+ COMe-mSP1 (nanoETXexpress-SP) module.
+
+ This driver can also be built as a module. If so, the module will
+ be called gpio-kempld_now1.
+
comment "MODULbus GPIO expanders:"
config GPIO_JANZ_TTL
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 22e07bc..59919db 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -28,6 +28,8 @@ obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o
obj-$(CONFIG_GPIO_ICH) += gpio-ich.o
obj-$(CONFIG_GPIO_IT8761E) += gpio-it8761e.o
obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
+obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o
+obj-$(CONFIG_GPIO_NOW1_KEMPLD) += gpio-kempld_now1.o
obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o
obj-$(CONFIG_GPIO_LANGWELL) += gpio-langwell.o
obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o
diff --git a/drivers/gpio/gpio-kempld.c b/drivers/gpio/gpio-kempld.c
new file mode 100644
index 0000000..e18967d
--- /dev/null
+++ b/drivers/gpio/gpio-kempld.c
@@ -0,0 +1,476 @@
+/*
+ * kempld_gpio.c - Kontron PLD GPIO driver
+ *
+ * Copyright (c) 2010-2012 Kontron Europe GmbH
+ * Author: Michael Brunner <michael.brunner@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/mfd/kempld.h>
+#include <linux/seq_file.h>
+
+#include "gpio-kempld.h"
+
+static int gpiobase = -1;
+static int gpioien = 0x00;
+static int gpioevt_lvl_edge = -1;
+static int gpioevt_low_high = -1;
+static int gpionmien = 0x00;
+
+static int kempld_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ pld = gpio->pld;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_LVL_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_LVL_NUM(offset));
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ kempld_release_mutex(pld);
+
+ return status;
+}
+
+static void kempld_gpio_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_LVL_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_LVL_NUM(offset));
+ if (value)
+ status |= KEMPLD_GPIO_MASK(offset);
+ else
+ status &= ~KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_GPIO_LVL_NUM(offset), status);
+
+ kempld_release_mutex(pld);
+}
+
+static int kempld_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_DIR_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_DIR_NUM(offset));
+ status &= ~KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_GPIO_DIR_NUM(offset), status);
+
+ kempld_release_mutex(pld);
+
+
+ return 0;
+}
+
+static int kempld_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_LVL_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_LVL_NUM(offset));
+ if (value)
+ status |= KEMPLD_GPIO_MASK(offset);
+ else
+ status &= ~KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_GPIO_LVL_NUM(offset), status);
+
+ status = kempld_read8(pld, KEMPLD_GPIO_DIR_NUM(offset));
+ status |= KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_GPIO_DIR_NUM(offset), status);
+
+ kempld_release_mutex(pld);
+
+ return 0;
+}
+
+static int kempld_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ return gpio->irq;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int kempld_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_DIR_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_DIR_NUM(offset));
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ kempld_release_mutex(pld);
+
+
+ return status ? 1 : 0;
+}
+
+static int kempld_gpio_get_ien(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_IEN_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_IEN_NUM(offset));
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ kempld_release_mutex(pld);
+
+
+ return status ? 1 : 0;
+}
+
+static int kempld_gpio_get_evt_lvl_edge(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_EVT_LVL_EDGE_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_EVT_LVL_EDGE_NUM(offset));
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ kempld_release_mutex(pld);
+
+
+ return status ? 1 : 0;
+}
+
+static int kempld_gpio_get_evt_high_low(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ gpio = dev_get_drvdata(chip->dev);
+ pld = gpio->pld;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_EVT_LOW_HIGH_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_EVT_LOW_HIGH_NUM(offset));
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ kempld_release_mutex(pld);
+
+
+ return status ? 1 : 0;
+}
+
+static int kempld_gpio_get_nmien(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_gpio_data *gpio
+ = container_of(chip, struct kempld_gpio_data, chip);
+ struct kempld_device_data *pld = gpio->pld;
+ int status;
+
+ gpio = dev_get_drvdata(chip->dev);
+ pld = gpio->pld;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_NMIEN_NUM(offset));
+
+ status = kempld_read8(pld, KEMPLD_GPIO_NMIEN_NUM(offset));
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ kempld_release_mutex(pld);
+
+
+ return status ? 1 : 0;
+}
+
+static void kempld_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ int i;
+
+ for (i = 0; i < chip->ngpio; i++) {
+ int gpio = i + chip->base;
+
+ seq_printf(s, " gpio-%-3d %s %s", gpio,
+ kempld_gpio_get_direction(chip, i)
+ ? "out" : "in",
+ kempld_gpio_get(chip, i)
+ ? "hi" : "lo");
+ seq_printf(s, ", event on %s (irq %s, nmi %s)\n",
+ (kempld_gpio_get_evt_lvl_edge(chip, i)
+ ? (kempld_gpio_get_evt_high_low(chip, i)
+ ? "rising edge" : "falling edge") :
+ (kempld_gpio_get_evt_high_low(chip, i)
+ ? "high level" : "low level")),
+ kempld_gpio_get_ien(chip, i)
+ ? "enabled" : "disabled",
+ kempld_gpio_get_nmien(chip, i)
+ ? "enabled" : "disabled");
+ }
+}
+#else
+#define kempld_gpio_dbg_show NULL
+#endif
+
+static int kempld_gpio_setup_event(struct kempld_gpio_data *gpio)
+{
+ struct kempld_device_data *pld = gpio->pld;
+ struct gpio_chip *chip = &gpio->chip;
+ int irq;
+
+ irq = gpio->irq;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_IRQ_GPIO);
+ irq = kempld_read8(pld, KEMPLD_IRQ_GPIO);
+
+ /* Leave if interrupts are not supported by the GPIO core */
+ if ((irq & 0xf0) == 0xf0)
+ return 0;
+
+ gpio->irq = irq & 0x0f;
+
+ if (gpioien & !gpio->mask) {
+ dev_err(chip->dev, "gpioien parameter is invalid");
+ gpio->irq = 0;
+ }
+
+ if (gpionmien & !gpio->mask) {
+ dev_err(chip->dev, "gpionmien parameter is invalid");
+ gpio->irq = 0;
+ }
+
+ if ((gpioevt_lvl_edge & !gpio->mask) && (gpioevt_lvl_edge != -1)) {
+ dev_err(chip->dev, "gpioevt_lvl_edge parameter is invalid");
+ gpio->irq = 0;
+ }
+
+ if ((gpioevt_low_high & !gpio->mask) && (gpioevt_low_high != -1)) {
+ dev_err(chip->dev, "gpioevt_low_high parameter is invalid");
+ gpio->irq = 0;
+ }
+
+ if (!gpio->irq)
+ return -EIO;
+
+ if (gpioevt_lvl_edge != -1)
+ kempld_write8(pld, KEMPLD_GPIO_EVT_LVL_EDGE, gpioevt_lvl_edge);
+
+ if (gpioevt_low_high != -1)
+ kempld_write8(pld, KEMPLD_GPIO_EVT_LOW_HIGH, gpioevt_low_high);
+
+ kempld_write8(pld, KEMPLD_GPIO_NMIEN, gpionmien);
+ kempld_write8(pld, KEMPLD_GPIO_IEN, gpioien);
+
+ kempld_release_mutex(pld);
+
+ return 0;
+}
+
+
+static int kempld_gpio_detect(struct kempld_gpio_data *gpio)
+{
+ struct kempld_device_data *pld = gpio->pld;
+ struct gpio_chip *chip = &gpio->chip;
+ u16 evt, evt_back;
+ int i;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_GPIO_IEN);
+
+ /* Backup event register as it might be already initialized */
+ evt_back = kempld_read16(pld, KEMPLD_GPIO_EVT_LVL_EDGE);
+
+ /* Disable interrupt enables and set event register to zero */
+ kempld_write16(pld, KEMPLD_GPIO_IEN, 0x0000);
+ kempld_write16(pld, KEMPLD_GPIO_NMIEN, 0x0000);
+ kempld_write16(pld, KEMPLD_GPIO_EVT_LVL_EDGE, 0x0000);
+
+ /* Read back event register */
+ evt = kempld_read16(pld, KEMPLD_GPIO_EVT_LVL_EDGE);
+
+ /* Restore event register */
+ kempld_write16(pld, KEMPLD_GPIO_EVT_LVL_EDGE, evt_back);
+
+ kempld_release_mutex(pld);
+
+ gpio->mask = ~evt;
+
+ /* Now check how many GPIO pins we have */
+ for (i = 0; i < KEMPLD_GPIO_MAX_NUM; i++) {
+ if (evt & 0x1)
+ break;
+ evt >>= 1;
+ }
+
+ chip->ngpio = i;
+
+ return 0;
+}
+
+static int kempld_gpio_probe(struct platform_device *pdev)
+{
+ struct kempld_device_data *pld;
+ struct kempld_gpio_data *gpio;
+ struct gpio_chip *chip;
+ int ret;
+
+ pld = dev_get_drvdata(pdev->dev.parent);
+
+ if (pld->info.spec_major < 2) {
+ dev_err(&pdev->dev,
+ "driver only supports GPIO devices "
+ "compatible to PLD spec. rev. 2.0 or higher\n");
+ ret = -ENXIO;
+ goto err_check_rev;
+ }
+
+ gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
+ if (gpio == NULL) {
+ dev_err(&pdev->dev, "unable to get memory for device data\n");
+ ret = -ENOMEM;
+ goto err_alloc_dev_data;
+ }
+
+ gpio->pld = pld;
+
+ platform_set_drvdata(pdev, gpio);
+
+ chip = &gpio->chip;
+ chip->label = "kempld-gpio";
+ chip->owner = THIS_MODULE;
+ chip->dev = &pdev->dev;
+ chip->can_sleep = 1;
+ chip->base = gpiobase;
+ chip->ngpio = KEMPLD_GPIO_MAX_NUM;
+
+ if (kempld_gpio_detect(gpio))
+ dev_err(&pdev->dev, "GPIO detection failed\n");
+ if (kempld_gpio_setup_event(gpio))
+ dev_err(&pdev->dev, "Initializing events failed\n");
+
+ chip->direction_input = kempld_gpio_direction_input;
+ chip->direction_output = kempld_gpio_direction_output;
+ chip->get = kempld_gpio_get;
+ chip->set = kempld_gpio_set;
+ chip->dbg_show = kempld_gpio_dbg_show;
+ if (gpio->irq)
+ chip->to_irq = kempld_gpio_to_irq;
+
+ ret = gpiochip_add(chip);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register GPIO chip\n");
+ goto err_gpiochip_add;
+ }
+
+ dev_info(&pdev->dev,
+ "GPIO functionality initialized with %d IOs mask (0x%04x)\n",
+ chip->ngpio, gpio->mask);
+
+ return 0;
+
+err_gpiochip_add:
+ kfree(gpio);
+err_alloc_dev_data:
+err_check_rev:
+
+ return ret;
+}
+
+static int kempld_gpio_remove(struct platform_device *pdev)
+{
+ struct kempld_gpio_data *gpio = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = gpiochip_remove(&gpio->chip);
+ if (ret == 0) {
+ kfree(gpio);
+ platform_set_drvdata(pdev, NULL);
+ }
+
+ return ret;
+}
+
+static struct platform_driver kempld_gpio_driver = {
+ .driver = {
+ .name = "kempld-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = kempld_gpio_probe,
+ .remove = kempld_gpio_remove,
+};
+
+static int __init kempld_gpio_init(void)
+{
+ return platform_driver_register(&kempld_gpio_driver);
+}
+
+static void __exit kempld_gpio_exit(void)
+{
+ platform_driver_unregister(&kempld_gpio_driver);
+}
+
+module_init(kempld_gpio_init);
+module_exit(kempld_gpio_exit);
+
+module_param(gpiobase, int, 0444);
+module_param(gpioien, int, 0444);
+module_param(gpioevt_lvl_edge, int, 0444);
+module_param(gpioevt_low_high, int, 0444);
+module_param(gpionmien, int, 0444);
+
+MODULE_DESCRIPTION("KEM PLD GPIO Driver");
+MODULE_AUTHOR("Michael Brunner <michael.brunner@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:kempld_gpio");
+MODULE_PARM_DESC(gpiobase, "Set GPIO base (default -1=dynamic)");
+MODULE_PARM_DESC(gpioien, "Set GPIO IEN register (default 0x00)");
+MODULE_PARM_DESC(gpioevt_lvl_edge,
+ "Set GPIO EVT_LVL_EDGE register (default -1=no change)");
+MODULE_PARM_DESC(gpioevt_low_high,
+ "Set GPIO EVT_LOW_HIGH register (default -1=no change)");
+MODULE_PARM_DESC(gpionmien, "Set GPIO NMIEN register (default 0x00)");
+
diff --git a/drivers/gpio/gpio-kempld.h b/drivers/gpio/gpio-kempld.h
new file mode 100644
index 0000000..173932c
--- /dev/null
+++ b/drivers/gpio/gpio-kempld.h
@@ -0,0 +1,50 @@
+/*
+ * kempld_gpio.h - Kontron PLD GPIO driver definitions
+ *
+ * Copyright (c) 2010-2012 Kontron Europe GmbH
+ * Author: Michael Brunner <michael.brunner@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _KEMPLD_GPIO_H_
+#define _KEMPLD_GPIO_H_
+
+#define KEMPLD_GPIO_MAX_NUM 16
+
+#define KEMPLD_GPIO_MASK(x) (1<<(x%8))
+
+#define KEMPLD_GPIO_DIR 0x40
+#define KEMPLD_GPIO_DIR_NUM(x) (0x40+x/8)
+#define KEMPLD_GPIO_LVL 0x42
+#define KEMPLD_GPIO_LVL_NUM(x) (0x42+x/8)
+#define KEMPLD_GPIO_STS 0x44
+#define KEMPLD_GPIO_STS_NUM(x) (0x44+x/8)
+#define KEMPLD_GPIO_EVT_LVL_EDGE 0x46
+#define KEMPLD_GPIO_EVT_LVL_EDGE_NUM(x) (0x46+x/8)
+#define KEMPLD_GPIO_EVT_LOW_HIGH 0x48
+#define KEMPLD_GPIO_EVT_LOW_HIGH_NUM(x) (0x48+x/8)
+#define KEMPLD_GPIO_IEN 0x4A
+#define KEMPLD_GPIO_IEN_NUM(x) (0x4A+x/8)
+#define KEMPLD_GPIO_NMIEN 0x4C
+#define KEMPLD_GPIO_NMIEN_NUM(x) (0x4C+x/8)
+
+struct kempld_gpio_data {
+ struct gpio_chip chip;
+ int irq;
+ struct kempld_device_data *pld;
+ uint16_t mask;
+};
+
+#endif /* _KEMPLD_GPIO_H_ */
diff --git a/drivers/gpio/gpio-kempld_now1.c b/drivers/gpio/gpio-kempld_now1.c
new file mode 100644
index 0000000..50ebd67
--- /dev/null
+++ b/drivers/gpio/gpio-kempld_now1.c
@@ -0,0 +1,280 @@
+/*
+ * kempld_now1_gpio.c - Kontron PLD GPIO driver for COMe-mSP1
+ *
+ * Copyright (c) 2011-2012 Kontron Europe GmbH
+ * Author: Michael Brunner <michael.brunner@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/mfd/kempld.h>
+#include <linux/seq_file.h>
+
+#include "gpio-kempld.h"
+
+#define KEMPLD_NOW1_GPIO_MAX_NUM 8
+
+#define KEMPLD_NOW1_FUNCTION 0x70
+#define KEMPLD_NOW1_FUNCTION_ALF_SDIO 0x01
+#define KEMPLD_NOW1_FUNCTION_USBCC 0x02
+#define KEMPLD_NOW1_GPIO_DIR 0xA0
+#define KEMPLD_NOW1_GPIO_LVL 0xA1
+
+static int kempld_now1_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct kempld_device_data *pld;
+ int status;
+
+ pld = dev_get_drvdata(chip->dev->parent);
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_GPIO_LVL);
+
+ status = kempld_read8(pld, KEMPLD_NOW1_GPIO_LVL);
+
+ kempld_release_mutex(pld);
+
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ return status ? 1 : 0;
+}
+
+static void kempld_now1_gpio_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct kempld_device_data *pld;
+ int status;
+
+ pld = dev_get_drvdata(chip->dev->parent);
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_GPIO_LVL);
+
+ status = kempld_read8(pld, KEMPLD_NOW1_GPIO_LVL);
+ if (value)
+ status |= KEMPLD_GPIO_MASK(offset);
+ else
+ status &= ~KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_NOW1_GPIO_LVL, status);
+
+ kempld_release_mutex(pld);
+}
+
+static int kempld_now1_gpio_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct kempld_device_data *pld;
+ int status;
+
+ pld = dev_get_drvdata(chip->dev->parent);
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_GPIO_DIR);
+
+ status = kempld_read8(pld, KEMPLD_NOW1_GPIO_DIR);
+ status &= ~KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_NOW1_GPIO_DIR, status);
+
+ kempld_release_mutex(pld);
+
+ return 0;
+}
+
+static int kempld_now1_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct kempld_device_data *pld;
+ int status;
+
+ pld = dev_get_drvdata(chip->dev->parent);
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_GPIO_DIR);
+
+ status = kempld_read8(pld, KEMPLD_NOW1_GPIO_LVL);
+ if (value)
+ status |= KEMPLD_GPIO_MASK(offset);
+ else
+ status &= ~KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_NOW1_GPIO_LVL, status);
+
+ status = kempld_read8(pld, KEMPLD_NOW1_GPIO_DIR);
+ status |= KEMPLD_GPIO_MASK(offset);
+ kempld_write8(pld, KEMPLD_NOW1_GPIO_DIR, status);
+
+ kempld_release_mutex(pld);
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int kempld_now1_gpio_get_direction(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct kempld_device_data *pld;
+ int status;
+
+ pld = dev_get_drvdata(chip->dev->parent);
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_GPIO_DIR);
+
+ status = kempld_read8(pld, KEMPLD_NOW1_GPIO_DIR);
+
+ kempld_release_mutex(pld);
+
+ status &= KEMPLD_GPIO_MASK(offset);
+
+ return status ? 1 : 0;
+}
+
+static void kempld_now1_gpio_dbg_show(struct seq_file *s,
+ struct gpio_chip *chip)
+{
+ struct kempld_device_data *pld;
+ int function;
+ int i;
+
+ pld = dev_get_drvdata(chip->dev->parent);
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_FUNCTION);
+
+ function = kempld_read8(pld, KEMPLD_NOW1_FUNCTION);
+
+ kempld_release_mutex(pld);
+
+ for (i = 0; i < chip->ngpio; i++) {
+ int gpio = i + chip->base;
+
+ seq_printf(s, " gpio-%-3d %s %s %s\n", gpio,
+ kempld_now1_gpio_get_direction(chip, i)
+ ? "out" : "in",
+ kempld_now1_gpio_get(chip, i)
+ ? "hi" : "lo",
+ function & KEMPLD_NOW1_FUNCTION_ALF_SDIO
+ ? "sdio" :
+ ((function & KEMPLD_NOW1_FUNCTION_USBCC)
+ && (i == 0))
+ ? "usbcc" : "gpio");
+ }
+}
+#else
+#define kempld_now1_gpio_dbg_show NULL
+#endif
+
+static int kempld_now1_gpio_probe(struct platform_device *pdev)
+{
+ struct kempld_device_data *pld;
+ struct gpio_chip *chip;
+ int function;
+ int ret;
+
+ pld = dev_get_drvdata(pdev->dev.parent);
+
+ chip = kzalloc(sizeof(struct gpio_chip), GFP_KERNEL);
+ if (chip == NULL) {
+ dev_err(&pdev->dev, "unable to get memory for device data\n");
+ ret = -ENOMEM;
+ goto err_alloc_dev_data;
+ }
+
+ chip->label = "kempld_now1-gpio";
+ chip->owner = THIS_MODULE;
+ chip->can_sleep = 1;
+ chip->dev = &pdev->dev;
+ chip->base = -1;
+ chip->ngpio = KEMPLD_NOW1_GPIO_MAX_NUM;
+
+ chip->direction_input = kempld_now1_gpio_direction_input;
+ chip->direction_output = kempld_now1_gpio_direction_output;
+ chip->get = kempld_now1_gpio_get;
+ chip->set = kempld_now1_gpio_set;
+ chip->dbg_show = kempld_now1_gpio_dbg_show;
+
+ kempld_get_mutex_set_index(pld, KEMPLD_NOW1_FUNCTION);
+
+ function = kempld_read8(pld, KEMPLD_NOW1_FUNCTION);
+
+ kempld_release_mutex(pld);
+
+ if (function & KEMPLD_NOW1_FUNCTION_ALF_SDIO)
+ dev_warn(&pdev->dev, "GPIO pins are used for SDIO\n");
+ if (function & KEMPLD_NOW1_FUNCTION_USBCC) {
+ dev_info(&pdev->dev,
+ "GPI[0] is forwarded to USB cable connect\n");
+ }
+
+ platform_set_drvdata(pdev, chip);
+
+ ret = gpiochip_add(chip);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register GPIO chip\n");
+ goto err_gpiochip_add;
+ }
+
+ dev_info(&pdev->dev, "GPIO functionality initialized\n");
+
+ return 0;
+
+err_gpiochip_add:
+ kfree(chip);
+err_alloc_dev_data:
+
+ return ret;
+}
+
+static int kempld_now1_gpio_remove(struct platform_device *pdev)
+{
+ struct gpio_chip *chip = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = gpiochip_remove(chip);
+ if (ret == 0) {
+ kfree(chip);
+ platform_set_drvdata(pdev, NULL);
+ }
+
+ return ret;
+}
+
+static struct platform_driver kempld_now1_gpio_driver = {
+ .driver = {
+ .name = "kempld_now1-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = kempld_now1_gpio_probe,
+ .remove = kempld_now1_gpio_remove,
+};
+
+static int __init kempld_now1_gpio_init(void)
+{
+ return platform_driver_register(&kempld_now1_gpio_driver);
+}
+
+static void __exit kempld_now1_gpio_exit(void)
+{
+ platform_driver_unregister(&kempld_now1_gpio_driver);
+}
+
+module_init(kempld_now1_gpio_init);
+module_exit(kempld_now1_gpio_exit);
+
+MODULE_DESCRIPTION("KEM PLD nanoETXexpress-SP GPIO Driver");
+MODULE_AUTHOR("Michael Brunner <michael.brunner@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:kempld_now1-gpio");
--
1.7.9.5
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