--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPIO support for Cirrus Logic Madera codecs
+ *
+ * Copyright (C) 2015-2018 Cirrus Logic
+ *
+ * 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; version 2.
+ */
+
+#include <linux/gpio/driver.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;
+ /* storage space for the gpio_chip we're using */
+ 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 reg_offset = 2 * offset;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
+ &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & MADERA_GP1_DIR_MASK);
+}
+
+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;
+ unsigned int reg_offset = 2 * offset;
+
+ return regmap_update_bits(madera->regmap,
+ MADERA_GPIO1_CTRL_2 + reg_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 reg_offset = 2 * offset;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_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 reg_offset = 2 * offset;
+ unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
+ int ret;
+
+ ret = regmap_update_bits(madera->regmap,
+ MADERA_GPIO1_CTRL_2 + reg_offset,
+ MADERA_GP1_DIR_MASK, 0);
+ if (ret < 0)
+ return ret;
+
+ return regmap_update_bits(madera->regmap,
+ MADERA_GPIO1_CTRL_1 + reg_offset,
+ MADERA_GP1_LVL_MASK, reg_val);
+}
+
+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 reg_offset = 2 * offset;
+ unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
+ int ret;
+
+ ret = regmap_update_bits(madera->regmap,
+ MADERA_GPIO1_CTRL_1 + reg_offset,
+ MADERA_GP1_LVL_MASK, reg_val);
+
+ /* set() doesn't return an error so log a warning */
+ if (ret)
+ dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
+ MADERA_GPIO1_CTRL_1 + reg_offset, ret);
+}
+
+static struct gpio_chip madera_gpio_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;
+
+ /* Construct suitable gpio_chip from the template in madera_gpio_chip */
+ madera_gpio->gpio_chip = madera_gpio_chip;
+ madera_gpio->gpio_chip.parent = pdev->dev.parent;
+
+ 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;
+ }
+
+ /* We want to be usable on systems that don't use devicetree or acpi */
+ 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_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * This is part of a composite MFD device which can only be used with
+ * the corresponding pinctrl driver. On all supported silicon the GPIO
+ * to pinctrl mapping is fixed in the silicon, so we register it
+ * explicitly instead of requiring a redundant gpio-ranges in the
+ * devicetree.
+ * In any case we also want to work on systems that don't use devicetree
+ * or acpi.
+ */
+ ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
+ 0, 0, madera_gpio->gpio_chip.ngpio);
+ if (ret) {
+ dev_dbg(&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",
+ },
+ .probe = madera_gpio_probe,
+};
+
+module_platform_driver(madera_gpio_driver);
+
+MODULE_SOFTDEP("pre: pinctrl-madera");
+MODULE_DESCRIPTION("GPIO interface for Madera codecs");
+MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
+MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:madera-gpio");
projects / openwrt / staging / blogic.git / commitdiff