/* * 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> #include <linux/rfkill-gpio.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 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->name = dev_name(dev); rfkill->type = (unsigned)id->driver_data; return 0; } static int rfkill_gpio_probe(struct platform_device *pdev) { struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; struct rfkill_gpio_data *rfkill; struct gpio_desc *gpio; int ret; rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); if (!rfkill) return -ENOMEM; if (ACPI_HANDLE(&pdev->dev)) { ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); if (ret) return ret; } else if (pdata) { rfkill->name = pdata->name; rfkill->type = pdata->type; } else { return -ENODEV; } rfkill->clk = devm_clk_get(&pdev->dev, NULL); gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0); if (!IS_ERR(gpio)) { ret = gpiod_direction_output(gpio, 0); if (ret) return ret; rfkill->reset_gpio = gpio; } gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1); if (!IS_ERR(gpio)) { ret = gpiod_direction_output(gpio, 0); if (ret) return ret; rfkill->shutdown_gpio = gpio; } /* Make sure at-least one of the GPIO is defined and that * a name is specified for this instance */ if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) { 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) return ret; platform_set_drvdata(pdev, rfkill); dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); return 0; } 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[] = { { "BCM2E1A", RFKILL_TYPE_BLUETOOTH }, { "BCM2E39", RFKILL_TYPE_BLUETOOTH }, { "BCM2E3D", RFKILL_TYPE_BLUETOOTH }, { "BCM4752", RFKILL_TYPE_GPS }, { "LNV4752", RFKILL_TYPE_GPS }, { }, }; #endif static struct platform_driver rfkill_gpio_driver = { .probe = rfkill_gpio_probe, .remove = rfkill_gpio_remove, .driver = { .name = "rfkill_gpio", .owner = THIS_MODULE, .acpi_match_table = ACPI_PTR(rfkill_acpi_match), }, }; module_platform_driver(rfkill_gpio_driver); MODULE_DESCRIPTION("gpio rfkill"); MODULE_AUTHOR("NVIDIA"); MODULE_LICENSE("GPL");