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95 lines
2.7 KiB
95 lines
2.7 KiB
/* |
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* Simple Power-Managed Bus Driver |
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* |
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* Copyright (C) 2014-2015 Glider bvba |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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static int simple_pm_bus_probe(struct platform_device *pdev) |
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{ |
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const struct device *dev = &pdev->dev; |
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const struct of_dev_auxdata *lookup = dev_get_platdata(dev); |
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struct device_node *np = dev->of_node; |
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const struct of_device_id *match; |
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/* |
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* Allow user to use driver_override to bind this driver to a |
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* transparent bus device which has a different compatible string |
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* that's not listed in simple_pm_bus_of_match. We don't want to do any |
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* of the simple-pm-bus tasks for these devices, so return early. |
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*/ |
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if (pdev->driver_override) |
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return 0; |
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match = of_match_device(dev->driver->of_match_table, dev); |
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/* |
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* These are transparent bus devices (not simple-pm-bus matches) that |
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* have their child nodes populated automatically. So, don't need to |
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* do anything more. We only match with the device if this driver is |
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* the most specific match because we don't want to incorrectly bind to |
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* a device that has a more specific driver. |
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*/ |
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if (match && match->data) { |
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if (of_property_match_string(np, "compatible", match->compatible) == 0) |
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return 0; |
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else |
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return -ENODEV; |
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} |
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dev_dbg(&pdev->dev, "%s\n", __func__); |
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pm_runtime_enable(&pdev->dev); |
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if (np) |
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of_platform_populate(np, NULL, lookup, &pdev->dev); |
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return 0; |
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} |
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static int simple_pm_bus_remove(struct platform_device *pdev) |
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{ |
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const void *data = of_device_get_match_data(&pdev->dev); |
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if (pdev->driver_override || data) |
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return 0; |
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dev_dbg(&pdev->dev, "%s\n", __func__); |
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pm_runtime_disable(&pdev->dev); |
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return 0; |
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} |
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#define ONLY_BUS ((void *) 1) /* Match if the device is only a bus. */ |
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static const struct of_device_id simple_pm_bus_of_match[] = { |
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{ .compatible = "simple-pm-bus", }, |
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{ .compatible = "simple-bus", .data = ONLY_BUS }, |
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{ .compatible = "simple-mfd", .data = ONLY_BUS }, |
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{ .compatible = "isa", .data = ONLY_BUS }, |
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{ .compatible = "arm,amba-bus", .data = ONLY_BUS }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match); |
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static struct platform_driver simple_pm_bus_driver = { |
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.probe = simple_pm_bus_probe, |
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.remove = simple_pm_bus_remove, |
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.driver = { |
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.name = "simple-pm-bus", |
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.of_match_table = simple_pm_bus_of_match, |
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}, |
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}; |
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module_platform_driver(simple_pm_bus_driver); |
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MODULE_DESCRIPTION("Simple Power-Managed Bus Driver"); |
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MODULE_AUTHOR("Geert Uytterhoeven <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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