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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (c) 2011, NVIDIA Corporation. */
#include <linux/dmi.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/rfkill.h>#include <linux/of.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) { int ret = clk_enable(rfkill->clk);
if (ret) return ret; }
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);}
/* List of DMI matches for devices on which rfkill-gpio should not load, * to avoid firmware bugs. */static const struct dmi_system_id rfkill_gpio_deny_table[] = { { /* Lenovo Yoga Tab 3 Pro YT3-X90, bogus "BCM4752" device in DSDT */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"), }, }, { }};
static int rfkill_gpio_probe(struct platform_device *pdev){ struct rfkill_gpio_data *rfkill; const char *type_name = NULL; const char *name_property; const char *type_property; struct gpio_desc *gpio; int ret;
if (dmi_check_system(rfkill_gpio_deny_table)) return -ENODEV;
rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); if (!rfkill) return -ENOMEM;
if (dev_of_node(&pdev->dev)) { name_property = "label"; type_property = "radio-type"; } else { name_property = "name"; type_property = "type"; } device_property_read_string(&pdev->dev, name_property, &rfkill->name); device_property_read_string(&pdev->dev, type_property, &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_ASIS); if (IS_ERR(gpio)) return PTR_ERR(gpio);
rfkill->reset_gpio = gpio;
gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_ASIS); 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; }
ret = gpiod_direction_output(rfkill->reset_gpio, true); if (ret) return ret;
ret = gpiod_direction_output(rfkill->shutdown_gpio, true); if (ret) return ret;
rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, rfkill->type, &rfkill_gpio_ops, rfkill); if (!rfkill->rfkill_dev) return -ENOMEM;
if (device_property_present(&pdev->dev, "default-blocked")) rfkill_init_sw_state(rfkill->rfkill_dev, true);
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 void 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);}
#ifdef CONFIG_ACPIstatic 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 const struct of_device_id rfkill_of_match[] __maybe_unused = { { .compatible = "rfkill-gpio", }, { },};MODULE_DEVICE_TABLE(of, rfkill_of_match);
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), .of_match_table = of_match_ptr(rfkill_of_match), },};
module_platform_driver(rfkill_gpio_driver);
MODULE_DESCRIPTION("gpio rfkill");MODULE_AUTHOR("NVIDIA");MODULE_LICENSE("GPL");