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/mfd/core.h> 17 18 static int mfd_add_device(struct device *parent, int id, 19 const struct mfd_cell *cell, 20 struct resource *mem_base, 21 int irq_base) 22 { 23 struct resource *res; 24 struct platform_device *pdev; 25 int ret = -ENOMEM; 26 int r; 27 28 pdev = platform_device_alloc(cell->name, id); 29 if (!pdev) 30 goto fail_alloc; 31 32 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 33 if (!res) 34 goto fail_device; 35 36 pdev->dev.parent = parent; 37 38 ret = platform_device_add_data(pdev, 39 cell->platform_data, cell->data_size); 40 if (ret) 41 goto fail_res; 42 43 for (r = 0; r < cell->num_resources; r++) { 44 res[r].name = cell->resources[r].name; 45 res[r].flags = cell->resources[r].flags; 46 47 /* Find out base to use */ 48 if (cell->resources[r].flags & IORESOURCE_MEM) { 49 res[r].parent = mem_base; 50 res[r].start = mem_base->start + 51 cell->resources[r].start; 52 res[r].end = mem_base->start + 53 cell->resources[r].end; 54 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 55 res[r].start = irq_base + 56 cell->resources[r].start; 57 res[r].end = irq_base + 58 cell->resources[r].end; 59 } else { 60 res[r].parent = cell->resources[r].parent; 61 res[r].start = cell->resources[r].start; 62 res[r].end = cell->resources[r].end; 63 } 64 } 65 66 platform_device_add_resources(pdev, res, cell->num_resources); 67 68 ret = platform_device_add(pdev); 69 if (ret) 70 goto fail_res; 71 72 kfree(res); 73 74 return 0; 75 76 /* platform_device_del(pdev); */ 77 fail_res: 78 kfree(res); 79 fail_device: 80 platform_device_put(pdev); 81 fail_alloc: 82 return ret; 83 } 84 85 int mfd_add_devices(struct device *parent, int id, 86 const struct mfd_cell *cells, int n_devs, 87 struct resource *mem_base, 88 int irq_base) 89 { 90 int i; 91 int ret = 0; 92 93 for (i = 0; i < n_devs; i++) { 94 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 95 if (ret) 96 break; 97 } 98 99 if (ret) 100 mfd_remove_devices(parent); 101 102 return ret; 103 } 104 EXPORT_SYMBOL(mfd_add_devices); 105 106 static int mfd_remove_devices_fn(struct device *dev, void *unused) 107 { 108 platform_device_unregister(to_platform_device(dev)); 109 return 0; 110 } 111 112 void mfd_remove_devices(struct device *parent) 113 { 114 device_for_each_child(parent, NULL, mfd_remove_devices_fn); 115 } 116 EXPORT_SYMBOL(mfd_remove_devices); 117 118 MODULE_LICENSE("GPL"); 119 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 120