1/* 2 * drivers/mfd/mfd-core.c 3 * 4 * core MFD support 5 * Copyright (c) 2006 Ian Molton 6 * Copyright (c) 2007,2008 Dmitry Baryshkov 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 */ 13 14#include <linux/kernel.h> 15#include <linux/platform_device.h> 16#include <linux/acpi.h> 17#include <linux/mfd/core.h> 18#include <linux/slab.h> 19 20static int mfd_add_device(struct device *parent, int id, 21 const struct mfd_cell *cell, 22 struct resource *mem_base, 23 int irq_base) 24{ 25 struct resource *res; 26 struct platform_device *pdev; 27 int ret = -ENOMEM; 28 int r; 29 30 pdev = platform_device_alloc(cell->name, id + cell->id); 31 if (!pdev) 32 goto fail_alloc; 33 34 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 35 if (!res) 36 goto fail_device; 37 38 pdev->dev.parent = parent; 39 platform_set_drvdata(pdev, cell->driver_data); 40 41 ret = platform_device_add_data(pdev, 42 cell->platform_data, cell->data_size); 43 if (ret) 44 goto fail_res; 45 46 for (r = 0; r < cell->num_resources; r++) { 47 res[r].name = cell->resources[r].name; 48 res[r].flags = cell->resources[r].flags; 49 50 /* Find out base to use */ 51 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 52 res[r].parent = mem_base; 53 res[r].start = mem_base->start + 54 cell->resources[r].start; 55 res[r].end = mem_base->start + 56 cell->resources[r].end; 57 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 58 res[r].start = irq_base + 59 cell->resources[r].start; 60 res[r].end = irq_base + 61 cell->resources[r].end; 62 } else { 63 res[r].parent = cell->resources[r].parent; 64 res[r].start = cell->resources[r].start; 65 res[r].end = cell->resources[r].end; 66 } 67 68 ret = acpi_check_resource_conflict(res); 69 if (ret) 70 goto fail_res; 71 } 72 73 ret = platform_device_add_resources(pdev, res, cell->num_resources); 74 if (ret) 75 goto fail_res; 76 77 ret = platform_device_add(pdev); 78 if (ret) 79 goto fail_res; 80 81 kfree(res); 82 83 return 0; 84 85/* platform_device_del(pdev); */ 86fail_res: 87 kfree(res); 88fail_device: 89 platform_device_put(pdev); 90fail_alloc: 91 return ret; 92} 93 94int mfd_add_devices(struct device *parent, int id, 95 const struct mfd_cell *cells, int n_devs, 96 struct resource *mem_base, 97 int irq_base) 98{ 99 int i; 100 int ret = 0; 101 102 for (i = 0; i < n_devs; i++) { 103 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 104 if (ret) 105 break; 106 } 107 108 if (ret) 109 mfd_remove_devices(parent); 110 111 return ret; 112} 113EXPORT_SYMBOL(mfd_add_devices); 114 115static int mfd_remove_devices_fn(struct device *dev, void *unused) 116{ 117 platform_device_unregister(to_platform_device(dev)); 118 return 0; 119} 120 121void mfd_remove_devices(struct device *parent) 122{ 123 device_for_each_child(parent, NULL, mfd_remove_devices_fn); 124} 125EXPORT_SYMBOL(mfd_remove_devices); 126 127MODULE_LICENSE("GPL"); 128MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 129