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/pm_runtime.h> 19 #include <linux/slab.h> 20 21 static int mfd_add_device(struct device *parent, int id, 22 const struct mfd_cell *cell, 23 struct resource *mem_base, 24 int irq_base) 25 { 26 struct resource *res; 27 struct platform_device *pdev; 28 int ret = -ENOMEM; 29 int r; 30 31 pdev = platform_device_alloc(cell->name, id + cell->id); 32 if (!pdev) 33 goto fail_alloc; 34 35 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 36 if (!res) 37 goto fail_device; 38 39 pdev->dev.parent = parent; 40 platform_set_drvdata(pdev, cell->driver_data); 41 42 if (cell->data_size) { 43 ret = platform_device_add_data(pdev, 44 cell->platform_data, cell->data_size); 45 if (ret) 46 goto fail_res; 47 } 48 49 for (r = 0; r < cell->num_resources; r++) { 50 res[r].name = cell->resources[r].name; 51 res[r].flags = cell->resources[r].flags; 52 53 /* Find out base to use */ 54 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 55 res[r].parent = mem_base; 56 res[r].start = mem_base->start + 57 cell->resources[r].start; 58 res[r].end = mem_base->start + 59 cell->resources[r].end; 60 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 61 res[r].start = irq_base + 62 cell->resources[r].start; 63 res[r].end = irq_base + 64 cell->resources[r].end; 65 } else { 66 res[r].parent = cell->resources[r].parent; 67 res[r].start = cell->resources[r].start; 68 res[r].end = cell->resources[r].end; 69 } 70 71 if (!cell->ignore_resource_conflicts) { 72 ret = acpi_check_resource_conflict(res); 73 if (ret) 74 goto fail_res; 75 } 76 } 77 78 ret = platform_device_add_resources(pdev, res, cell->num_resources); 79 if (ret) 80 goto fail_res; 81 82 ret = platform_device_add(pdev); 83 if (ret) 84 goto fail_res; 85 86 if (cell->pm_runtime_no_callbacks) 87 pm_runtime_no_callbacks(&pdev->dev); 88 89 kfree(res); 90 91 return 0; 92 93 /* platform_device_del(pdev); */ 94 fail_res: 95 kfree(res); 96 fail_device: 97 platform_device_put(pdev); 98 fail_alloc: 99 return ret; 100 } 101 102 int mfd_add_devices(struct device *parent, int id, 103 const struct mfd_cell *cells, int n_devs, 104 struct resource *mem_base, 105 int irq_base) 106 { 107 int i; 108 int ret = 0; 109 110 for (i = 0; i < n_devs; i++) { 111 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 112 if (ret) 113 break; 114 } 115 116 if (ret) 117 mfd_remove_devices(parent); 118 119 return ret; 120 } 121 EXPORT_SYMBOL(mfd_add_devices); 122 123 static int mfd_remove_devices_fn(struct device *dev, void *unused) 124 { 125 platform_device_unregister(to_platform_device(dev)); 126 return 0; 127 } 128 129 void mfd_remove_devices(struct device *parent) 130 { 131 device_for_each_child(parent, NULL, mfd_remove_devices_fn); 132 } 133 EXPORT_SYMBOL(mfd_remove_devices); 134 135 MODULE_LICENSE("GPL"); 136 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 137