Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-idio-16.c b/drivers/gpio/gpio-idio-16.c
new file mode 100644
index 000000000..53b1eb876
--- /dev/null
+++ b/drivers/gpio/gpio-idio-16.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPIO library for the ACCES IDIO-16 family
+ * Copyright (C) 2022 William Breathitt Gray
+ */
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/gpio/regmap.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+#include "gpio-idio-16.h"
+
+#define DEFAULT_SYMBOL_NAMESPACE GPIO_IDIO_16
+
+#define IDIO_16_DAT_BASE 0x0
+#define IDIO_16_OUT_BASE IDIO_16_DAT_BASE
+#define IDIO_16_IN_BASE (IDIO_16_DAT_BASE + 1)
+#define IDIO_16_CLEAR_INTERRUPT 0x1
+#define IDIO_16_ENABLE_IRQ 0x2
+#define IDIO_16_DEACTIVATE_INPUT_FILTERS 0x3
+#define IDIO_16_DISABLE_IRQ IDIO_16_ENABLE_IRQ
+#define IDIO_16_INTERRUPT_STATUS 0x6
+
+#define IDIO_16_NGPIO 32
+#define IDIO_16_NGPIO_PER_REG 8
+#define IDIO_16_REG_STRIDE 4
+
+struct idio_16_data {
+	struct regmap *map;
+	unsigned int irq_mask;
+};
+
+static int idio_16_handle_mask_sync(const int index, const unsigned int mask_buf_def,
+				    const unsigned int mask_buf, void *const irq_drv_data)
+{
+	struct idio_16_data *const data = irq_drv_data;
+	const unsigned int prev_mask = data->irq_mask;
+	int err;
+	unsigned int val;
+
+	/* exit early if no change since the previous mask */
+	if (mask_buf == prev_mask)
+		return 0;
+
+	/* remember the current mask for the next mask sync */
+	data->irq_mask = mask_buf;
+
+	/* if all previously masked, enable interrupts when unmasking */
+	if (prev_mask == mask_buf_def) {
+		err = regmap_write(data->map, IDIO_16_CLEAR_INTERRUPT, 0x00);
+		if (err)
+			return err;
+		return regmap_read(data->map, IDIO_16_ENABLE_IRQ, &val);
+	}
+
+	/* if all are currently masked, disable interrupts */
+	if (mask_buf == mask_buf_def)
+		return regmap_write(data->map, IDIO_16_DISABLE_IRQ, 0x00);
+
+	return 0;
+}
+
+static int idio_16_reg_mask_xlate(struct gpio_regmap *const gpio, const unsigned int base,
+				  const unsigned int offset, unsigned int *const reg,
+				  unsigned int *const mask)
+{
+	unsigned int stride;
+
+	/* Input lines start at GPIO 16 */
+	if (offset < 16) {
+		stride = offset / IDIO_16_NGPIO_PER_REG;
+		*reg = IDIO_16_OUT_BASE + stride * IDIO_16_REG_STRIDE;
+	} else {
+		stride = (offset - 16) / IDIO_16_NGPIO_PER_REG;
+		*reg = IDIO_16_IN_BASE + stride * IDIO_16_REG_STRIDE;
+	}
+
+	*mask = BIT(offset % IDIO_16_NGPIO_PER_REG);
+
+	return 0;
+}
+
+static const char *idio_16_names[IDIO_16_NGPIO] = {
+	"OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
+	"OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
+	"IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
+	"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15",
+};
+
+/**
+ * devm_idio_16_regmap_register - Register an IDIO-16 GPIO device
+ * @dev:	device that is registering this IDIO-16 GPIO device
+ * @config:	configuration for idio_16_regmap_config
+ *
+ * Registers an IDIO-16 GPIO device. Returns 0 on success and negative error number on failure.
+ */
+int devm_idio_16_regmap_register(struct device *const dev,
+				 const struct idio_16_regmap_config *const config)
+{
+	struct gpio_regmap_config gpio_config = {};
+	int err;
+	struct idio_16_data *data;
+	struct regmap_irq_chip *chip;
+	struct regmap_irq_chip_data *chip_data;
+
+	if (!config->parent)
+		return -EINVAL;
+
+	if (!config->map)
+		return -EINVAL;
+
+	if (!config->regmap_irqs)
+		return -EINVAL;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	data->map = config->map;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->name = dev_name(dev);
+	chip->status_base = IDIO_16_INTERRUPT_STATUS;
+	chip->mask_base = IDIO_16_ENABLE_IRQ;
+	chip->ack_base = IDIO_16_CLEAR_INTERRUPT;
+	chip->no_status = config->no_status;
+	chip->num_regs = 1;
+	chip->irqs = config->regmap_irqs;
+	chip->num_irqs = config->num_regmap_irqs;
+	chip->handle_mask_sync = idio_16_handle_mask_sync;
+	chip->irq_drv_data = data;
+
+	/* Disable IRQ to prevent spurious interrupts before we're ready */
+	err = regmap_write(data->map, IDIO_16_DISABLE_IRQ, 0x00);
+	if (err)
+		return err;
+
+	err = devm_regmap_add_irq_chip(dev, data->map, config->irq, 0, 0, chip, &chip_data);
+	if (err)
+		return dev_err_probe(dev, err, "IRQ registration failed\n");
+
+	if (config->filters) {
+		/* Deactivate input filters */
+		err = regmap_write(data->map, IDIO_16_DEACTIVATE_INPUT_FILTERS, 0x00);
+		if (err)
+			return err;
+	}
+
+	gpio_config.parent = config->parent;
+	gpio_config.regmap = data->map;
+	gpio_config.ngpio = IDIO_16_NGPIO;
+	gpio_config.names = idio_16_names;
+	gpio_config.reg_dat_base = GPIO_REGMAP_ADDR(IDIO_16_DAT_BASE);
+	gpio_config.reg_set_base = GPIO_REGMAP_ADDR(IDIO_16_DAT_BASE);
+	gpio_config.ngpio_per_reg = IDIO_16_NGPIO_PER_REG;
+	gpio_config.reg_stride = IDIO_16_REG_STRIDE;
+	gpio_config.irq_domain = regmap_irq_get_domain(chip_data);
+	gpio_config.reg_mask_xlate = idio_16_reg_mask_xlate;
+
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config));
+}
+EXPORT_SYMBOL_GPL(devm_idio_16_regmap_register);
+
+MODULE_AUTHOR("William Breathitt Gray");
+MODULE_DESCRIPTION("ACCES IDIO-16 GPIO Library");
+MODULE_LICENSE("GPL");