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 20 static 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 if (cell->data_size) { 42 ret = platform_device_add_data(pdev, 43 cell->platform_data, cell->data_size); 44 if (ret) 45 goto fail_res; 46 } 47 48 for (r = 0; r < cell->num_resources; r++) { 49 res[r].name = cell->resources[r].name; 50 res[r].flags = cell->resources[r].flags; 51 52 /* Find out base to use */ 53 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 54 res[r].parent = mem_base; 55 res[r].start = mem_base->start + 56 cell->resources[r].start; 57 res[r].end = mem_base->start + 58 cell->resources[r].end; 59 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 60 res[r].start = irq_base + 61 cell->resources[r].start; 62 res[r].end = irq_base + 63 cell->resources[r].end; 64 } else { 65 res[r].parent = cell->resources[r].parent; 66 res[r].start = cell->resources[r].start; 67 res[r].end = cell->resources[r].end; 68 } 69 70 if (!cell->ignore_resource_conflicts) { 71 ret = acpi_check_resource_conflict(res); 72 if (ret) 73 goto fail_res; 74 } 75 } 76 77 ret = platform_device_add_resources(pdev, res, cell->num_resources); 78 if (ret) 79 goto fail_res; 80 81 ret = platform_device_add(pdev); 82 if (ret) 83 goto fail_res; 84 85 kfree(res); 86 87 return 0; 88 89 /* platform_device_del(pdev); */ 90 fail_res: 91 kfree(res); 92 fail_device: 93 platform_device_put(pdev); 94 fail_alloc: 95 return ret; 96 } 97 98 int mfd_add_devices(struct device *parent, int id, 99 const struct mfd_cell *cells, int n_devs, 100 struct resource *mem_base, 101 int irq_base) 102 { 103 int i; 104 int ret = 0; 105 106 for (i = 0; i < n_devs; i++) { 107 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 108 if (ret) 109 break; 110 } 111 112 if (ret) 113 mfd_remove_devices(parent); 114 115 return ret; 116 } 117 EXPORT_SYMBOL(mfd_add_devices); 118 119 static int mfd_remove_devices_fn(struct device *dev, void *unused) 120 { 121 platform_device_unregister(to_platform_device(dev)); 122 return 0; 123 } 124 125 void mfd_remove_devices(struct device *parent) 126 { 127 device_for_each_child(parent, NULL, mfd_remove_devices_fn); 128 } 129 EXPORT_SYMBOL(mfd_remove_devices); 130 131 MODULE_LICENSE("GPL"); 132 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 133