From: Florian Lobmaier <[email protected]>
Added multi-function device driver support for ams AS3722 PMIC
Includes modules gpio, regulator, rtc, and watchdog
Signed-off-by: Florian Lobmaier <[email protected]>
---
diff -uprN -X Documentation/dontdiff ../kernel_3.8.8/linux-kernel/drivers/gpio/gpio-as3722.c ./drivers/gpio/gpio-as3722.c
--- ../kernel_3.8.8/linux-kernel/drivers/gpio/gpio-as3722.c 1970-01-01 01:00:00.000000000 +0100
+++ ./drivers/gpio/gpio-as3722.c 2013-05-23 13:12:36.000000000 +0200
@@ -0,0 +1,320 @@
+/*
+ * as3722-gpio.c - gpiolib support for ams AS3722 PMICs
+ *
+ * Copyright (C) 2013 ams AG
+ *
+ * Author: Florian Lobmaier <[email protected]>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/as3722-reg.h>
+#include <linux/mfd/as3722-plat.h>
+
+struct as3722_gpio {
+ struct as3722 *as3722;
+ struct gpio_chip gpio_chip;
+};
+
+static inline struct as3722_gpio *to_as3722_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct as3722_gpio, gpio_chip);
+}
+
+static int as3722_gpio_direction_in(struct gpio_chip *chip, unsigned
+ offset)
+{
+ struct as3722_gpio *as3722_gpio = to_as3722_gpio(chip);
+ struct as3722 *as3722 = as3722_gpio->as3722;
+
+ return as3722_set_bits(as3722, AS3722_GPIO0_CONTROL_REG + offset,
+ AS3722_GPIO_MODE_MASK,
+ AS3722_GPIO_MODE_INPUT);
+}
+
+static int as3722_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct as3722_gpio *as3722_gpio = to_as3722_gpio(chip);
+ struct as3722 *as3722 = as3722_gpio->as3722;
+ int ret;
+ u32 val;
+
+ ret = as3722_reg_read(as3722, AS3722_GPIO_SIGNAL_IN_REG, &val);
+ if (ret < 0)
+ return ret;
+
+ if (val & (AS3722_GPIO1_SIGNAL_MASK << offset))
+ return 1;
+ else
+ return 0;
+}
+
+static int as3722_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct as3722_gpio *as3722_gpio = to_as3722_gpio(chip);
+ struct as3722 *as3722 = as3722_gpio->as3722;
+
+ return as3722_set_bits(as3722, AS3722_GPIO0_CONTROL_REG + offset,
+ AS3722_GPIO_MODE_MASK,
+ AS3722_GPIO_MODE_OUTPUT_VDDH);
+}
+
+static void as3722_gpio_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct as3722_gpio *as3722_gpio = to_as3722_gpio(chip);
+ struct as3722 *as3722 = as3722_gpio->as3722;
+
+ as3722_set_bits(as3722, AS3722_GPIO_SIGNAL_OUT_REG, 1 << offset,
+ value << offset);
+}
+
+static int as3722_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct as3722_gpio *as3722_gpio = to_as3722_gpio(chip);
+ struct as3722 *as3722 = as3722_gpio->as3722;
+
+ return regmap_irq_get_virq(as3722->irq_data, AS3722_IRQ_GPIO1 + offset);
+}
+
+static int as3722_gpio_set_config(struct as3722_gpio *as3722_gpio,
+ struct as3722_gpio_config *gpio_cfg)
+{
+ int ret = 0;
+ u8 val = 0;
+ int gpio = gpio_cfg->gpio;
+ struct as3722 *as3722 = as3722_gpio->as3722;
+ if ((gpio < AS3722_GPIO0) || (gpio > AS3722_GPIO7))
+ return -EINVAL;
+
+ /* .invert + .iosf + .mode */
+ /* set up write of the GPIOX control register */
+ val = (gpio_cfg->iosf & AS3722_GPIO_IOSF_MASK) +
+ (gpio_cfg->mode & AS3722_GPIO_MODE_MASK);
+ if (gpio_cfg->invert)
+ val += (AS3722_GPIO_INV & AS3722_GPIO_INV_MASK);
+
+ ret = as3722_reg_write(as3722, AS3722_GPIO0_CONTROL_REG + gpio, val);
+ if (ret != 0) {
+ dev_err(as3722->dev, "AS3722_GPIO%d_CTRL_REG write err,
+ ret: %d\n",
+ gpio, ret);
+ return ret;
+ }
+
+ /* if GPIO is configured as an output, set initial output state */
+ if ((gpio_cfg->mode == AS3722_GPIO_MODE_OUTPUT_VDDH) ||
+ (gpio_cfg->mode == AS3722_GPIO_MODE_OUTPUT_VDDL)) {
+ /*GPIO0 -> bit 0, ..., GPIO7 -> bit 7, output_state = 0 or 1*/
+ val = (gpio_cfg->output_state ^ gpio_cfg->invert) << gpio;
+ ret = as3722_set_bits(as3722, AS3722_GPIO_SIGNAL_OUT_REG,
+ 1 << gpio, val);
+ }
+
+ return ret;
+}
+
+static int as3722_gpio_init_regs(struct as3722_gpio *as3722_gpio,
+ struct as3722_platform_data *pdata)
+{
+ int ret;
+ int i;
+ for (i = 0; i < pdata->num_gpio_cfgs; i++) {
+ ret = as3722_gpio_set_config(as3722_gpio,
+ &pdata->gpio_cfgs[i]);
+ if (ret < 0) {
+ dev_err(as3722_gpio->as3722->dev,
+ "Failed to set gpio config\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void as3722_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ struct as3722_gpio *as3722_gpio = to_as3722_gpio(chip);
+ struct as3722 *as3722 = as3722_gpio->as3722;
+ int i;
+
+ for (i = 0; i < chip->ngpio; i++) {
+ int gpio = i + chip->base;
+ u32 reg;
+ int ret;
+ const char *label, *pull, *direction;
+
+ /* We report the GPIO even if it's not requested since
+ * we're also reporting things like alternate
+ * functions which apply even when the GPIO is not in
+ * use as a GPIO.
+ */
+ label = gpiochip_is_requested(chip, i);
+ if (!label)
+ label = "Unrequested";
+
+ seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
+
+ ret = as3722_reg_read(as3722,
+ AS3722_GPIO0_CONTROL_REG + i, ®);
+ if (ret < 0) {
+ dev_err(as3722->dev,
+ "GPIO control %d read failed: %d\n",
+ gpio, ret);
+ seq_printf(s, "\n");
+ continue;
+ }
+
+ switch (reg & AS3722_GPIO_MODE_MASK) {
+ case AS3722_GPIO_MODE_INPUT:
+ direction = "in";
+ pull = "nopull";
+ break;
+ case AS3722_GPIO_MODE_OUTPUT_VDDH:
+ direction = "out";
+ pull = "push and pull";
+ break;
+ case AS3722_GPIO_MODE_IO_OPEN_DRAIN:
+ direction = "io";
+ pull = "nopull";
+ break;
+ case AS3722_GPIO_MODE_INPUT_W_PULLUP:
+ direction = "in";
+ pull = "pullup";
+ break;
+ case AS3722_GPIO_MODE_INPUT_W_PULLDOWN:
+ direction = "in";
+ pull = "pulldown";
+ break;
+ case AS3722_GPIO_MODE_IO_OPEN_DRAIN_PULLUP:
+ direction = "io";
+ pull = "pullup";
+ break;
+ case AS3722_GPIO_MODE_OUTPUT_VDDL:
+ direction = "out";
+ pull = "push and pull";
+ break;
+ default:
+ direction = "INVALID DIRECTION/MODE";
+ pull = "INVALID PULL";
+ break;
+ }
+
+ seq_printf(s, " %s %s %s\n"
+ " %s (0x%4x)\n",
+ direction,
+ as3722_gpio_get(chip, i) ? "high" : "low",
+ pull,
+ reg & AS3722_GPIO_INV_MASK ? " inverted" : "",
+ reg);
+ }
+}
+#else
+#define as3722_gpio_dbg_show NULL
+#endif
+
+static struct gpio_chip as3722_gpio_chip = {
+ .label = "as3722",
+ .owner = THIS_MODULE,
+ .direction_input = as3722_gpio_direction_in,
+ .get = as3722_gpio_get,
+ .direction_output = as3722_gpio_direction_out,
+ .set = as3722_gpio_set,
+ .to_irq = as3722_gpio_to_irq,
+ .dbg_show = as3722_gpio_dbg_show,
+ .can_sleep = 1,
+};
+
+static int as3722_gpio_probe(struct platform_device *pdev)
+{
+ struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
+ struct as3722_platform_data *pdata = dev_get_platdata(pdev->dev.parent);
+ struct as3722_gpio *as3722_gpio;
+ int ret;
+
+ as3722_gpio = devm_kzalloc(&pdev->dev,
+ sizeof(*as3722_gpio), GFP_KERNEL);
+ if (as3722_gpio == NULL) {
+ dev_err(&pdev->dev, "Memory allocaiton failure\n");
+ return -ENOMEM;
+ }
+
+ as3722_gpio->as3722 = as3722;
+ as3722_gpio->gpio_chip = as3722_gpio_chip;
+ as3722_gpio->gpio_chip.ngpio = AS3722_NUM_GPIO;
+ as3722_gpio->gpio_chip.dev = &pdev->dev;
+ if (pdata && pdata->gpio_base)
+ as3722_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ as3722_gpio->gpio_chip.base = -1;
+
+ platform_set_drvdata(pdev, as3722_gpio);
+
+ ret = as3722_gpio_init_regs(as3722_gpio, pdata);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "gpio_init_regs failed\n");
+ return ret;
+ }
+
+ ret = gpiochip_add(&as3722_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+ ret);
+ return ret;
+ }
+ return 0;
+}
+
+static int as3722_gpio_remove(struct platform_device *pdev)
+{
+ struct as3722_gpio *as3722_gpio = platform_get_drvdata(pdev);
+
+ return gpiochip_remove(&as3722_gpio->gpio_chip);
+}
+
+static struct platform_driver as3722_gpio_driver = {
+ .driver.name = "as3722-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = as3722_gpio_probe,
+ .remove = as3722_gpio_remove,
+};
+
+static int __init as3722_gpio_init(void)
+{
+ return platform_driver_register(&as3722_gpio_driver);
+}
+subsys_initcall(as3722_gpio_init);
+
+static void __exit as3722_gpio_exit(void)
+{
+ platform_driver_unregister(&as3722_gpio_driver);
+}
+module_exit(as3722_gpio_exit);
+
+MODULE_AUTHOR("Florian Lobmaier <[email protected]>");
+MODULE_DESCRIPTION("GPIO interface for AS3722 PMICs");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:as3722-gpio");
diff -uprN -X Documentation/dontdiff ../kernel_3.8.8/linux-kernel/drivers/gpio/Kconfig ./drivers/gpio/Kconfig
--- ../kernel_3.8.8/linux-kernel/drivers/gpio/Kconfig 2013-05-15 14:55:53.000000000 +0200
+++ ./drivers/gpio/Kconfig 2013-05-23 13:12:36.000000000 +0200
@@ -306,6 +306,15 @@ config GPIO_ARIZONA
help
Support for GPIOs on Wolfson Arizona class devices.
+config GPIO_AS3722
+ tristate "ams AS3722 GPIO support"
+ depends on MFD_AS3722
+ help
+ This option enables support for on-chip GPIOs found on
+ AS3722 PMIC from ams.
+ To compile this driver as a module, choose M here: the module will
+ be called as3722-gpio.
+
config GPIO_MAX7300
tristate "Maxim MAX7300 GPIO expander"
depends on I2C
diff -uprN -X Documentation/dontdiff ../kernel_3.8.8/linux-kernel/drivers/gpio/Makefile ./drivers/gpio/Makefile
--- ../kernel_3.8.8/linux-kernel/drivers/gpio/Makefile 2013-05-15 14:55:53.000000000 +0200
+++ ./drivers/gpio/Makefile 2013-05-23 13:12:36.000000000 +0200
@@ -16,6 +16,7 @@ obj-$(CONFIG_GPIO_ADP5520) += gpio-adp55
obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
+onj-$(CONFIG_GPIO_AS3722) += gpio-as3722.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o