174 lines
4.0 KiB
C
174 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2011, NVIDIA Corporation.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/rfkill.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/gpio/consumer.h>
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struct rfkill_gpio_data {
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const char *name;
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enum rfkill_type type;
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struct gpio_desc *reset_gpio;
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struct gpio_desc *shutdown_gpio;
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struct rfkill *rfkill_dev;
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struct clk *clk;
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bool clk_enabled;
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};
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static int rfkill_gpio_set_power(void *data, bool blocked)
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{
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struct rfkill_gpio_data *rfkill = data;
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if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
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clk_enable(rfkill->clk);
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gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
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gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
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if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
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clk_disable(rfkill->clk);
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rfkill->clk_enabled = !blocked;
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return 0;
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}
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static const struct rfkill_ops rfkill_gpio_ops = {
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.set_block = rfkill_gpio_set_power,
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};
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static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
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static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
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static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
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{ "reset-gpios", &reset_gpios, 1 },
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{ "shutdown-gpios", &shutdown_gpios, 1 },
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{ },
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};
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static int rfkill_gpio_acpi_probe(struct device *dev,
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struct rfkill_gpio_data *rfkill)
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{
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const struct acpi_device_id *id;
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id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!id)
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return -ENODEV;
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rfkill->type = (unsigned)id->driver_data;
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return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios);
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}
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static int rfkill_gpio_probe(struct platform_device *pdev)
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{
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struct rfkill_gpio_data *rfkill;
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struct gpio_desc *gpio;
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const char *type_name;
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int ret;
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rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
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if (!rfkill)
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return -ENOMEM;
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device_property_read_string(&pdev->dev, "name", &rfkill->name);
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device_property_read_string(&pdev->dev, "type", &type_name);
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if (!rfkill->name)
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rfkill->name = dev_name(&pdev->dev);
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rfkill->type = rfkill_find_type(type_name);
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if (ACPI_HANDLE(&pdev->dev)) {
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ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
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if (ret)
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return ret;
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}
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rfkill->clk = devm_clk_get(&pdev->dev, NULL);
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gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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rfkill->reset_gpio = gpio;
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gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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rfkill->shutdown_gpio = gpio;
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/* Make sure at-least one GPIO is defined for this instance */
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if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
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dev_err(&pdev->dev, "invalid platform data\n");
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return -EINVAL;
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}
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rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
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rfkill->type, &rfkill_gpio_ops,
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rfkill);
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if (!rfkill->rfkill_dev)
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return -ENOMEM;
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ret = rfkill_register(rfkill->rfkill_dev);
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if (ret < 0)
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goto err_destroy;
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platform_set_drvdata(pdev, rfkill);
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dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
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return 0;
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err_destroy:
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rfkill_destroy(rfkill->rfkill_dev);
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return ret;
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}
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static int rfkill_gpio_remove(struct platform_device *pdev)
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{
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struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
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rfkill_unregister(rfkill->rfkill_dev);
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rfkill_destroy(rfkill->rfkill_dev);
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return 0;
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}
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id rfkill_acpi_match[] = {
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{ "BCM4752", RFKILL_TYPE_GPS },
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{ "LNV4752", RFKILL_TYPE_GPS },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
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#endif
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static struct platform_driver rfkill_gpio_driver = {
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.probe = rfkill_gpio_probe,
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.remove = rfkill_gpio_remove,
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.driver = {
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.name = "rfkill_gpio",
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.acpi_match_table = ACPI_PTR(rfkill_acpi_match),
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},
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};
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module_platform_driver(rfkill_gpio_driver);
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MODULE_DESCRIPTION("gpio rfkill");
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MODULE_AUTHOR("NVIDIA");
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MODULE_LICENSE("GPL");
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