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path: root/drivers/gpio/gpio-tps6586x.c
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Diffstat (limited to 'drivers/gpio/gpio-tps6586x.c')
-rw-r--r--drivers/gpio/gpio-tps6586x.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-tps6586x.c b/drivers/gpio/gpio-tps6586x.c
new file mode 100644
index 000000000..c5713524b
--- /dev/null
+++ b/drivers/gpio/gpio-tps6586x.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TI TPS6586x GPIO driver
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ * Author: Laxman dewangan <ldewangan@nvidia.com>
+ *
+ * Based on tps6586x.c
+ * Copyright (c) 2010 CompuLab Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ */
+
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mfd/tps6586x.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+/* GPIO control registers */
+#define TPS6586X_GPIOSET1 0x5d
+#define TPS6586X_GPIOSET2 0x5e
+
+struct tps6586x_gpio {
+ struct gpio_chip gpio_chip;
+ struct device *parent;
+};
+
+static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
+ uint8_t val;
+ int ret;
+
+ ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
+ if (ret)
+ return ret;
+
+ return !!(val & (1 << offset));
+}
+
+static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
+
+ tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
+ value << offset, 1 << offset);
+}
+
+static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
+ uint8_t val, mask;
+
+ tps6586x_gpio_set(gc, offset, value);
+
+ val = 0x1 << (offset * 2);
+ mask = 0x3 << (offset * 2);
+
+ return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
+ val, mask);
+}
+
+static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
+
+ return tps6586x_irq_get_virq(tps6586x_gpio->parent,
+ TPS6586X_INT_PLDO_0 + offset);
+}
+
+static int tps6586x_gpio_probe(struct platform_device *pdev)
+{
+ struct tps6586x_platform_data *pdata;
+ struct tps6586x_gpio *tps6586x_gpio;
+
+ device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
+
+ pdata = dev_get_platdata(pdev->dev.parent);
+ tps6586x_gpio = devm_kzalloc(&pdev->dev,
+ sizeof(*tps6586x_gpio), GFP_KERNEL);
+ if (!tps6586x_gpio)
+ return -ENOMEM;
+
+ tps6586x_gpio->parent = pdev->dev.parent;
+
+ tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
+ tps6586x_gpio->gpio_chip.label = pdev->name;
+ tps6586x_gpio->gpio_chip.parent = &pdev->dev;
+ tps6586x_gpio->gpio_chip.ngpio = 4;
+ tps6586x_gpio->gpio_chip.can_sleep = true;
+
+ /* FIXME: add handling of GPIOs as dedicated inputs */
+ tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
+ tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
+ tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
+ tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
+
+ if (pdata && pdata->gpio_base)
+ tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ tps6586x_gpio->gpio_chip.base = -1;
+
+ return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
+ tps6586x_gpio);
+}
+
+static struct platform_driver tps6586x_gpio_driver = {
+ .driver.name = "tps6586x-gpio",
+ .probe = tps6586x_gpio_probe,
+};
+
+static int __init tps6586x_gpio_init(void)
+{
+ return platform_driver_register(&tps6586x_gpio_driver);
+}
+subsys_initcall(tps6586x_gpio_init);