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- /*
- * Copyright (c) 2011, NVIDIA Corporation.
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include <linux/gpio.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/rfkill.h>
- #include <linux/platform_device.h>
- #include <linux/clk.h>
- #include <linux/slab.h>
- #include <linux/acpi.h>
- #include <linux/gpio/consumer.h>
- struct rfkill_gpio_data {
- const char *name;
- enum rfkill_type type;
- struct gpio_desc *reset_gpio;
- struct gpio_desc *shutdown_gpio;
- struct rfkill *rfkill_dev;
- struct clk *clk;
- bool clk_enabled;
- };
- static int rfkill_gpio_set_power(void *data, bool blocked)
- {
- struct rfkill_gpio_data *rfkill = data;
- if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
- clk_enable(rfkill->clk);
- gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
- gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
- if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
- clk_disable(rfkill->clk);
- rfkill->clk_enabled = !blocked;
- return 0;
- }
- static const struct rfkill_ops rfkill_gpio_ops = {
- .set_block = rfkill_gpio_set_power,
- };
- static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
- static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
- static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
- { "reset-gpios", &reset_gpios, 1 },
- { "shutdown-gpios", &shutdown_gpios, 1 },
- { },
- };
- static int rfkill_gpio_acpi_probe(struct device *dev,
- struct rfkill_gpio_data *rfkill)
- {
- const struct acpi_device_id *id;
- id = acpi_match_device(dev->driver->acpi_match_table, dev);
- if (!id)
- return -ENODEV;
- rfkill->type = (unsigned)id->driver_data;
- return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios);
- }
- static int rfkill_gpio_probe(struct platform_device *pdev)
- {
- struct rfkill_gpio_data *rfkill;
- struct gpio_desc *gpio;
- const char *type_name;
- int ret;
- rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
- if (!rfkill)
- return -ENOMEM;
- device_property_read_string(&pdev->dev, "name", &rfkill->name);
- device_property_read_string(&pdev->dev, "type", &type_name);
- if (!rfkill->name)
- rfkill->name = dev_name(&pdev->dev);
- rfkill->type = rfkill_find_type(type_name);
- if (ACPI_HANDLE(&pdev->dev)) {
- ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
- if (ret)
- return ret;
- }
- rfkill->clk = devm_clk_get(&pdev->dev, NULL);
- gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
- if (IS_ERR(gpio))
- return PTR_ERR(gpio);
- rfkill->reset_gpio = gpio;
- gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW);
- if (IS_ERR(gpio))
- return PTR_ERR(gpio);
- rfkill->shutdown_gpio = gpio;
- /* Make sure at-least one GPIO is defined for this instance */
- if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
- dev_err(&pdev->dev, "invalid platform data\n");
- return -EINVAL;
- }
- rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
- rfkill->type, &rfkill_gpio_ops,
- rfkill);
- if (!rfkill->rfkill_dev)
- return -ENOMEM;
- ret = rfkill_register(rfkill->rfkill_dev);
- if (ret < 0)
- goto err_destroy;
- platform_set_drvdata(pdev, rfkill);
- dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
- return 0;
- err_destroy:
- rfkill_destroy(rfkill->rfkill_dev);
- return ret;
- }
- static int rfkill_gpio_remove(struct platform_device *pdev)
- {
- struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
- rfkill_unregister(rfkill->rfkill_dev);
- rfkill_destroy(rfkill->rfkill_dev);
- return 0;
- }
- #ifdef CONFIG_ACPI
- static const struct acpi_device_id rfkill_acpi_match[] = {
- { "BCM4752", RFKILL_TYPE_GPS },
- { "LNV4752", RFKILL_TYPE_GPS },
- { },
- };
- MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
- #endif
- static struct platform_driver rfkill_gpio_driver = {
- .probe = rfkill_gpio_probe,
- .remove = rfkill_gpio_remove,
- .driver = {
- .name = "rfkill_gpio",
- .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
- },
- };
- module_platform_driver(rfkill_gpio_driver);
- MODULE_DESCRIPTION("gpio rfkill");
- MODULE_AUTHOR("NVIDIA");
- MODULE_LICENSE("GPL");
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