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 19 static int mfd_add_device(struct device *parent, int id, 20 const struct mfd_cell *cell, 21 struct resource *mem_base, 22 int irq_base) 23 { 24 struct resource *res; 25 struct platform_device *pdev; 26 int ret = -ENOMEM; 27 int r; 28 29 pdev = platform_device_alloc(cell->name, id + cell->id); 30 if (!pdev) 31 goto fail_alloc; 32 33 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 34 if (!res) 35 goto fail_device; 36 37 pdev->dev.parent = parent; 38 platform_set_drvdata(pdev, cell->driver_data); 39 40 ret = platform_device_add_data(pdev, 41 cell->platform_data, cell->data_size); 42 if (ret) 43 goto fail_res; 44 45 for (r = 0; r < cell->num_resources; r++) { 46 res[r].name = cell->resources[r].name; 47 res[r].flags = cell->resources[r].flags; 48 49 /* Find out base to use */ 50 if (cell->resources[r].flags & IORESOURCE_MEM) { 51 res[r].parent = mem_base; 52 res[r].start = mem_base->start + 53 cell->resources[r].start; 54 res[r].end = mem_base->start + 55 cell->resources[r].end; 56 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 57 res[r].start = irq_base + 58 cell->resources[r].start; 59 res[r].end = irq_base + 60 cell->resources[r].end; 61 } else { 62 res[r].parent = cell->resources[r].parent; 63 res[r].start = cell->resources[r].start; 64 res[r].end = cell->resources[r].end; 65 } 66 67 ret = acpi_check_resource_conflict(res); 68 if (ret) 69 goto fail_res; 70 } 71 72 platform_device_add_resources(pdev, res, cell->num_resources); 73 74 ret = platform_device_add(pdev); 75 if (ret) 76 goto fail_res; 77 78 kfree(res); 79 80 return 0; 81 82 /* platform_device_del(pdev); */ 83 fail_res: 84 kfree(res); 85 fail_device: 86 platform_device_put(pdev); 87 fail_alloc: 88 return ret; 89 } 90 91 int mfd_add_devices(struct device *parent, int id, 92 const struct mfd_cell *cells, int n_devs, 93 struct resource *mem_base, 94 int irq_base) 95 { 96 int i; 97 int ret = 0; 98 99 for (i = 0; i < n_devs; i++) { 100 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 101 if (ret) 102 break; 103 } 104 105 if (ret) 106 mfd_remove_devices(parent); 107 108 return ret; 109 } 110 EXPORT_SYMBOL(mfd_add_devices); 111 112 static int mfd_remove_devices_fn(struct device *dev, void *unused) 113 { 114 platform_device_unregister(to_platform_device(dev)); 115 return 0; 116 } 117 118 void mfd_remove_devices(struct device *parent) 119 { 120 device_for_each_child(parent, NULL, mfd_remove_devices_fn); 121 } 122 EXPORT_SYMBOL(mfd_remove_devices); 123 124 MODULE_LICENSE("GPL"); 125 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 126