--- /dev/null
+/*
+ * TI TPS6591x GPIO driver
+ *
+ * Copyright 2010 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
+ *
+ * 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; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/tps65910.h>
+#include <linux/of_device.h>
+
+struct tps65910_gpio {
+ struct gpio_chip gpio_chip;
+ struct tps65910 *tps65910;
+};
+
+static inline struct tps65910_gpio *to_tps65910_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct tps65910_gpio, gpio_chip);
+}
+
+static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
+ struct tps65910 *tps65910 = tps65910_gpio->tps65910;
+ unsigned int val;
+
+ tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);
+
+ if (val & GPIO_STS_MASK)
+ return 1;
+
+ return 0;
+}
+
+static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
+ struct tps65910 *tps65910 = tps65910_gpio->tps65910;
+
+ if (value)
+ tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
+ GPIO_SET_MASK);
+ else
+ tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
+ GPIO_SET_MASK);
+}
+
+static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
+ struct tps65910 *tps65910 = tps65910_gpio->tps65910;
+
+ /* Set the initial value */
+ tps65910_gpio_set(gc, offset, value);
+
+ return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
+ GPIO_CFG_MASK);
+}
+
+static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
+ struct tps65910 *tps65910 = tps65910_gpio->tps65910;
+
+ return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
+ GPIO_CFG_MASK);
+}
+
+#ifdef CONFIG_OF
+static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
+ struct tps65910 *tps65910, int chip_ngpio)
+{
+ struct tps65910_board *tps65910_board = tps65910->of_plat_data;
+ unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
+ int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
+ int ret;
+ int idx;
+
+ tps65910_board->gpio_base = -1;
+ ret = of_property_read_u32_array(tps65910->dev->of_node,
+ "ti,en-gpio-sleep", prop_array, ngpio);
+ if (ret < 0) {
+ dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
+ return tps65910_board;
+ }
+
+ for (idx = 0; idx < ngpio; idx++)
+ tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
+
+ return tps65910_board;
+}
+#else
+static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
+ struct tps65910 *tps65910, int chip_ngpio)
+{
+ return NULL;
+}
+#endif
+
+static int tps65910_gpio_probe(struct platform_device *pdev)
+{
+ struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
+ struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
+ struct tps65910_gpio *tps65910_gpio;
+ int ret;
+ int i;
+
+ tps65910_gpio = devm_kzalloc(&pdev->dev,
+ sizeof(*tps65910_gpio), GFP_KERNEL);
+ if (!tps65910_gpio)
+ return -ENOMEM;
+
+ tps65910_gpio->tps65910 = tps65910;
+
+ tps65910_gpio->gpio_chip.owner = THIS_MODULE;
+ tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
+
+ switch (tps65910_chip_id(tps65910)) {
+ case TPS65910:
+ tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
+ break;
+ case TPS65911:
+ tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
+ break;
+ default:
+ return -EINVAL;
+ }
+ tps65910_gpio->gpio_chip.can_sleep = true;
+ tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
+ tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
+ tps65910_gpio->gpio_chip.set = tps65910_gpio_set;
+ tps65910_gpio->gpio_chip.get = tps65910_gpio_get;
+ tps65910_gpio->gpio_chip.dev = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+ tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
+#endif
+ if (pdata && pdata->gpio_base)
+ tps65910_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ tps65910_gpio->gpio_chip.base = -1;
+
+ if (!pdata && tps65910->dev->of_node)
+ pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
+ tps65910_gpio->gpio_chip.ngpio);
+
+ if (!pdata)
+ goto skip_init;
+
+ /* Configure sleep control for gpios if provided */
+ for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
+ if (!pdata->en_gpio_sleep[i])
+ continue;
+
+ ret = tps65910_reg_set_bits(tps65910,
+ TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
+ if (ret < 0)
+ dev_warn(tps65910->dev,
+ "GPIO Sleep setting failed with err %d\n", ret);
+ }
+
+skip_init:
+ ret = gpiochip_add(&tps65910_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, tps65910_gpio);
+
+ return ret;
+}
+
+static int tps65910_gpio_remove(struct platform_device *pdev)
+{
+ struct tps65910_gpio *tps65910_gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&tps65910_gpio->gpio_chip);
+ return 0;
+}
+
+static struct platform_driver tps65910_gpio_driver = {
+ .driver.name = "tps65910-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = tps65910_gpio_probe,
+ .remove = tps65910_gpio_remove,
+};
+
+static int __init tps65910_gpio_init(void)
+{
+ return platform_driver_register(&tps65910_gpio_driver);
+}
+subsys_initcall(tps65910_gpio_init);
+
+static void __exit tps65910_gpio_exit(void)
+{
+ platform_driver_unregister(&tps65910_gpio_driver);
+}
+module_exit(tps65910_gpio_exit);
+
+MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
+MODULE_AUTHOR("Jorge Eduardo Candelaria jedu@slimlogic.co.uk>");
+MODULE_DESCRIPTION("GPIO interface for TPS65910/TPS6511 PMICs");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tps65910-gpio");
Code Review / kvmfornfv.git / blobdiff