/* * 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 #include #include #include #include #include #include #include #include #include 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 acpi_dev_add_driver_gpios(ACPI_COMPANION(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) 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); acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->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"); only
authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 12:38:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 12:38:43 -0800
commit0263d4ebd94b36280608e296cba39b924b6e832b (patch)
tree6e21b4b3d8e8fb12cdfcfd185d46992487265a9b /sound/pci/es1938.c
parent19ca2c8fecb1592d623fe5e82d6796f8d446268d (diff)
parent7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b (diff)
Merge tag 'platform-drivers-x86-v4.10-4' of git://git.infradead.org/linux-platform-drivers-x86
Pull x86 platform-driver fixes from Andy Shevchenko: "This is my first pull request since I become a co-maintainer of Platform Drivers x86 subsystem. It's a bit bigger than usual due to material collected for almost two weeks in a row. MAINTAINERS: - Add myself to X86 PLATFORM DRIVERS as a co-maintainer ideapad-laptop: - handle ACPI event 1 intel_mid_powerbtn: - Set IRQ_ONESHOT surface3-wmi: - fix uninitialized symbol - Shut up unused-function warning mlx-platform: - free first dev on error" * tag 'platform-drivers-x86-v4.10-4' of git://git.infradead.org/linux-platform-drivers-x86: MAINTAINERS: Add myself to X86 PLATFORM DRIVERS as a co-maintainer platform/x86: ideapad-laptop: handle ACPI event 1 platform/x86: intel_mid_powerbtn: Set IRQ_ONESHOT platform/x86: surface3-wmi: fix uninitialized symbol platform/x86: surface3-wmi: Shut up unused-function warning platform/x86: mlx-platform: free first dev on error
Diffstat (limited to 'sound/pci/es1938.c')