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