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path: root/drivers/gpio/gpio-altera-a10sr.c
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Diffstat (limited to 'drivers/gpio/gpio-altera-a10sr.c')
-rw-r--r--drivers/gpio/gpio-altera-a10sr.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-altera-a10sr.c b/drivers/gpio/gpio-altera-a10sr.c
new file mode 100644
index 0000000000..11edf1fe6c
--- /dev/null
+++ b/drivers/gpio/gpio-altera-a10sr.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
+ *
+ * GPIO driver for Altera Arria10 MAX5 System Resource Chip
+ *
+ * Adapted from gpio-tps65910.c
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/mfd/altera-a10sr.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+
+/**
+ * struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure
+ * @gp: : instance of the gpio_chip
+ * @regmap: the regmap from the parent device.
+ */
+struct altr_a10sr_gpio {
+ struct gpio_chip gp;
+ struct regmap *regmap;
+};
+
+static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT));
+}
+
+static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
+
+ regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG,
+ BIT(ALTR_A10SR_LED_VALID_SHIFT + offset),
+ value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset)
+ : 0);
+}
+
+static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int nr)
+{
+ if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int nr, int value)
+{
+ if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))
+ return -EINVAL;
+
+ altr_a10sr_gpio_set(gc, nr, value);
+ return 0;
+}
+
+static const struct gpio_chip altr_a10sr_gc = {
+ .label = "altr_a10sr_gpio",
+ .owner = THIS_MODULE,
+ .get = altr_a10sr_gpio_get,
+ .set = altr_a10sr_gpio_set,
+ .direction_input = altr_a10sr_gpio_direction_input,
+ .direction_output = altr_a10sr_gpio_direction_output,
+ .can_sleep = true,
+ .ngpio = 12,
+ .base = -1,
+};
+
+static int altr_a10sr_gpio_probe(struct platform_device *pdev)
+{
+ struct altr_a10sr_gpio *gpio;
+ struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->regmap = a10sr->regmap;
+
+ gpio->gp = altr_a10sr_gc;
+ gpio->gp.parent = pdev->dev.parent;
+ gpio->gp.fwnode = dev_fwnode(&pdev->dev);
+
+ return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
+}
+
+static const struct of_device_id altr_a10sr_gpio_of_match[] = {
+ { .compatible = "altr,a10sr-gpio" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);
+
+static struct platform_driver altr_a10sr_gpio_driver = {
+ .probe = altr_a10sr_gpio_probe,
+ .driver = {
+ .name = "altr_a10sr_gpio",
+ .of_match_table = altr_a10sr_gpio_of_match,
+ },
+};
+module_platform_driver(altr_a10sr_gpio_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
+MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");