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 platform_set_drvdata(pdev, cell->driver_data); 38 39 ret = platform_device_add_data(pdev, 40 cell->platform_data, cell->data_size); 41 if (ret) 42 goto fail_res; 43 44 for (r = 0; r < cell->num_resources; r++) { 45 res[r].name = cell->resources[r].name; 46 res[r].flags = cell->resources[r].flags; 47 48 /* Find out base to use */ 49 if (cell->resources[r].flags & IORESOURCE_MEM) { 50 res[r].parent = mem_base; 51 res[r].start = mem_base->start + 52 cell->resources[r].start; 53 res[r].end = mem_base->start + 54 cell->resources[r].end; 55 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 56 res[r].start = irq_base + 57 cell->resources[r].start; 58 res[r].end = irq_base + 59 cell->resources[r].end; 60 } else { 61 res[r].parent = cell->resources[r].parent; 62 res[r].start = cell->resources[r].start; 63 res[r].end = cell->resources[r].end; 64 } 65 } 66 67 platform_device_add_resources(pdev, res, cell->num_resources); 68 69 ret = platform_device_add(pdev); 70 if (ret) 71 goto fail_res; 72 73 kfree(res); 74 75 return 0; 76 77 /* platform_device_del(pdev); */ 78 fail_res: 79 kfree(res); 80 fail_device: 81 platform_device_put(pdev); 82 fail_alloc: 83 return ret; 84 } 85 86 int mfd_add_devices(struct device *parent, int id, 87 const struct mfd_cell *cells, int n_devs, 88 struct resource *mem_base, 89 int irq_base) 90 { 91 int i; 92 int ret = 0; 93 94 for (i = 0; i < n_devs; i++) { 95 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 96 if (ret) 97 break; 98 } 99 100 if (ret) 101 mfd_remove_devices(parent); 102 103 return ret; 104 } 105 EXPORT_SYMBOL(mfd_add_devices); 106 107 static int mfd_remove_devices_fn(struct device *dev, void *unused) 108 { 109 platform_device_unregister(to_platform_device(dev)); 110 return 0; 111 } 112 113 void mfd_remove_devices(struct device *parent) 114 { 115 device_for_each_child(parent, NULL, mfd_remove_devices_fn); 116 } 117 EXPORT_SYMBOL(mfd_remove_devices); 118 119 MODULE_LICENSE("GPL"); 120 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 121