Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-arizona.c b/drivers/gpio/gpio-arizona.c
new file mode 100644
index 000000000..c6cf27003
--- /dev/null
+++ b/drivers/gpio/gpio-arizona.c
@@ -0,0 +1,218 @@
+/*
+ * gpiolib support for Wolfson Arizona class devices
+ *
+ * Copyright 2012 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/arizona/core.h>
+#include <linux/mfd/arizona/pdata.h>
+#include <linux/mfd/arizona/registers.h>
+
+struct arizona_gpio {
+	struct arizona *arizona;
+	struct gpio_chip gpio_chip;
+};
+
+static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
+	struct arizona *arizona = arizona_gpio->arizona;
+	bool persistent = gpiochip_line_is_persistent(chip, offset);
+	bool change;
+	int ret;
+
+	ret = regmap_update_bits_check(arizona->regmap,
+				       ARIZONA_GPIO1_CTRL + offset,
+				       ARIZONA_GPN_DIR, ARIZONA_GPN_DIR,
+				       &change);
+	if (ret < 0)
+		return ret;
+
+	if (change && persistent) {
+		pm_runtime_mark_last_busy(chip->parent);
+		pm_runtime_put_autosuspend(chip->parent);
+	}
+
+	return 0;
+}
+
+static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
+	struct arizona *arizona = arizona_gpio->arizona;
+	unsigned int reg, val;
+	int ret;
+
+	reg = ARIZONA_GPIO1_CTRL + offset;
+	ret = regmap_read(arizona->regmap, reg, &val);
+	if (ret < 0)
+		return ret;
+
+	/* Resume to read actual registers for input pins */
+	if (val & ARIZONA_GPN_DIR) {
+		ret = pm_runtime_get_sync(chip->parent);
+		if (ret < 0) {
+			dev_err(chip->parent, "Failed to resume: %d\n", ret);
+			pm_runtime_put_autosuspend(chip->parent);
+			return ret;
+		}
+
+		/* Register is cached, drop it to ensure a physical read */
+		ret = regcache_drop_region(arizona->regmap, reg, reg);
+		if (ret < 0) {
+			dev_err(chip->parent, "Failed to drop cache: %d\n",
+				ret);
+			pm_runtime_put_autosuspend(chip->parent);
+			return ret;
+		}
+
+		ret = regmap_read(arizona->regmap, reg, &val);
+		if (ret < 0) {
+			pm_runtime_put_autosuspend(chip->parent);
+			return ret;
+		}
+
+		pm_runtime_mark_last_busy(chip->parent);
+		pm_runtime_put_autosuspend(chip->parent);
+	}
+
+	if (val & ARIZONA_GPN_LVL)
+		return 1;
+	else
+		return 0;
+}
+
+static int arizona_gpio_direction_out(struct gpio_chip *chip,
+				     unsigned offset, int value)
+{
+	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
+	struct arizona *arizona = arizona_gpio->arizona;
+	bool persistent = gpiochip_line_is_persistent(chip, offset);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
+	if (ret < 0)
+		return ret;
+
+	if ((val & ARIZONA_GPN_DIR) && persistent) {
+		ret = pm_runtime_get_sync(chip->parent);
+		if (ret < 0) {
+			dev_err(chip->parent, "Failed to resume: %d\n", ret);
+			pm_runtime_put(chip->parent);
+			return ret;
+		}
+	}
+
+	if (value)
+		value = ARIZONA_GPN_LVL;
+
+	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+				  ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
+}
+
+static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
+	struct arizona *arizona = arizona_gpio->arizona;
+
+	if (value)
+		value = ARIZONA_GPN_LVL;
+
+	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+			   ARIZONA_GPN_LVL, value);
+}
+
+static const struct gpio_chip template_chip = {
+	.label			= "arizona",
+	.owner			= THIS_MODULE,
+	.direction_input	= arizona_gpio_direction_in,
+	.get			= arizona_gpio_get,
+	.direction_output	= arizona_gpio_direction_out,
+	.set			= arizona_gpio_set,
+	.can_sleep		= true,
+};
+
+static int arizona_gpio_probe(struct platform_device *pdev)
+{
+	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
+	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
+	struct arizona_gpio *arizona_gpio;
+	int ret;
+
+	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
+				    GFP_KERNEL);
+	if (!arizona_gpio)
+		return -ENOMEM;
+
+	arizona_gpio->arizona = arizona;
+	arizona_gpio->gpio_chip = template_chip;
+	arizona_gpio->gpio_chip.parent = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
+#endif
+
+	switch (arizona->type) {
+	case WM5102:
+	case WM5110:
+	case WM8280:
+	case WM8997:
+	case WM8998:
+	case WM1814:
+		arizona_gpio->gpio_chip.ngpio = 5;
+		break;
+	case WM1831:
+	case CS47L24:
+		arizona_gpio->gpio_chip.ngpio = 2;
+		break;
+	default:
+		dev_err(&pdev->dev, "Unknown chip variant %d\n",
+			arizona->type);
+		return -EINVAL;
+	}
+
+	if (pdata && pdata->gpio_base)
+		arizona_gpio->gpio_chip.base = pdata->gpio_base;
+	else
+		arizona_gpio->gpio_chip.base = -1;
+
+	pm_runtime_enable(&pdev->dev);
+
+	ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
+				     arizona_gpio);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver arizona_gpio_driver = {
+	.driver.name	= "arizona-gpio",
+	.probe		= arizona_gpio_probe,
+};
+
+module_platform_driver(arizona_gpio_driver);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("GPIO interface for Arizona devices");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:arizona-gpio");