summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-pisosr.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpio/gpio-pisosr.c')
-rw-r--r--drivers/gpio/gpio-pisosr.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-pisosr.c b/drivers/gpio/gpio-pisosr.c
new file mode 100644
index 0000000000..e3013e778e
--- /dev/null
+++ b/drivers/gpio/gpio-pisosr.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
+ * Andrew Davis <afd@ti.com>
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/spi/spi.h>
+
+#define DEFAULT_NGPIO 8
+
+/**
+ * struct pisosr_gpio - GPIO driver data
+ * @chip: GPIO controller chip
+ * @spi: SPI device pointer
+ * @buffer: Buffer for device reads
+ * @buffer_size: Size of buffer
+ * @load_gpio: GPIO pin used to load input into device
+ * @lock: Protects read sequences
+ */
+struct pisosr_gpio {
+ struct gpio_chip chip;
+ struct spi_device *spi;
+ u8 *buffer;
+ size_t buffer_size;
+ struct gpio_desc *load_gpio;
+ struct mutex lock;
+};
+
+static int pisosr_gpio_refresh(struct pisosr_gpio *gpio)
+{
+ int ret;
+
+ mutex_lock(&gpio->lock);
+
+ if (gpio->load_gpio) {
+ gpiod_set_value_cansleep(gpio->load_gpio, 1);
+ udelay(1); /* registers load time (~10ns) */
+ gpiod_set_value_cansleep(gpio->load_gpio, 0);
+ udelay(1); /* registers recovery time (~5ns) */
+ }
+
+ ret = spi_read(gpio->spi, gpio->buffer, gpio->buffer_size);
+
+ mutex_unlock(&gpio->lock);
+
+ return ret;
+}
+
+static int pisosr_gpio_get_direction(struct gpio_chip *chip,
+ unsigned offset)
+{
+ /* This device always input */
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int pisosr_gpio_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ /* This device always input */
+ return 0;
+}
+
+static int pisosr_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ /* This device is input only */
+ return -EINVAL;
+}
+
+static int pisosr_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct pisosr_gpio *gpio = gpiochip_get_data(chip);
+
+ /* Refresh may not always be needed */
+ pisosr_gpio_refresh(gpio);
+
+ return (gpio->buffer[offset / 8] >> (offset % 8)) & 0x1;
+}
+
+static int pisosr_gpio_get_multiple(struct gpio_chip *chip,
+ unsigned long *mask, unsigned long *bits)
+{
+ struct pisosr_gpio *gpio = gpiochip_get_data(chip);
+ unsigned long offset;
+ unsigned long gpio_mask;
+ unsigned long buffer_state;
+
+ pisosr_gpio_refresh(gpio);
+
+ bitmap_zero(bits, chip->ngpio);
+ for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
+ buffer_state = gpio->buffer[offset / 8] & gpio_mask;
+ bitmap_set_value8(bits, buffer_state, offset);
+ }
+
+ return 0;
+}
+
+static const struct gpio_chip template_chip = {
+ .label = "pisosr-gpio",
+ .owner = THIS_MODULE,
+ .get_direction = pisosr_gpio_get_direction,
+ .direction_input = pisosr_gpio_direction_input,
+ .direction_output = pisosr_gpio_direction_output,
+ .get = pisosr_gpio_get,
+ .get_multiple = pisosr_gpio_get_multiple,
+ .base = -1,
+ .ngpio = DEFAULT_NGPIO,
+ .can_sleep = true,
+};
+
+static void pisosr_mutex_destroy(void *lock)
+{
+ mutex_destroy(lock);
+}
+
+static int pisosr_gpio_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct pisosr_gpio *gpio;
+ int ret;
+
+ gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->chip = template_chip;
+ gpio->chip.parent = dev;
+ of_property_read_u16(dev->of_node, "ngpios", &gpio->chip.ngpio);
+
+ gpio->spi = spi;
+
+ gpio->buffer_size = DIV_ROUND_UP(gpio->chip.ngpio, 8);
+ gpio->buffer = devm_kzalloc(dev, gpio->buffer_size, GFP_KERNEL);
+ if (!gpio->buffer)
+ return -ENOMEM;
+
+ gpio->load_gpio = devm_gpiod_get_optional(dev, "load", GPIOD_OUT_LOW);
+ if (IS_ERR(gpio->load_gpio))
+ return dev_err_probe(dev, PTR_ERR(gpio->load_gpio),
+ "Unable to allocate load GPIO\n");
+
+ mutex_init(&gpio->lock);
+ ret = devm_add_action_or_reset(dev, pisosr_mutex_destroy, &gpio->lock);
+ if (ret)
+ return ret;
+
+ ret = devm_gpiochip_add_data(dev, &gpio->chip, gpio);
+ if (ret < 0) {
+ dev_err(dev, "Unable to register gpiochip\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct spi_device_id pisosr_gpio_id_table[] = {
+ { "pisosr-gpio", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(spi, pisosr_gpio_id_table);
+
+static const struct of_device_id pisosr_gpio_of_match_table[] = {
+ { .compatible = "pisosr-gpio", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pisosr_gpio_of_match_table);
+
+static struct spi_driver pisosr_gpio_driver = {
+ .driver = {
+ .name = "pisosr-gpio",
+ .of_match_table = pisosr_gpio_of_match_table,
+ },
+ .probe = pisosr_gpio_probe,
+ .id_table = pisosr_gpio_id_table,
+};
+module_spi_driver(pisosr_gpio_driver);
+
+MODULE_AUTHOR("Andrew Davis <afd@ti.com>");
+MODULE_DESCRIPTION("SPI Compatible PISO Shift Register GPIO Driver");
+MODULE_LICENSE("GPL v2");