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| 1 | /* |
| 2 | * ISA bus. |
| 3 | */ |
| 4 | |
| 5 | #include <linux/device.h> |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/dma-mapping.h> |
| 11 | #include <linux/isa.h> |
| 12 | |
| 13 | static struct device isa_bus = { |
| 14 | .init_name = "isa" |
| 15 | }; |
| 16 | |
| 17 | struct isa_dev { |
| 18 | struct device dev; |
| 19 | struct device *next; |
| 20 | unsigned int id; |
| 21 | }; |
| 22 | |
| 23 | #define to_isa_dev(x) container_of((x), struct isa_dev, dev) |
| 24 | |
| 25 | static int isa_bus_match(struct device *dev, struct device_driver *driver) |
| 26 | { |
| 27 | struct isa_driver *isa_driver = to_isa_driver(driver); |
| 28 | |
| 29 | if (dev->platform_data == isa_driver) { |
| 30 | if (!isa_driver->match || |
| 31 | isa_driver->match(dev, to_isa_dev(dev)->id)) |
| 32 | return 1; |
| 33 | dev->platform_data = NULL; |
| 34 | } |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | static int isa_bus_probe(struct device *dev) |
| 39 | { |
| 40 | struct isa_driver *isa_driver = dev->platform_data; |
| 41 | |
| 42 | if (isa_driver->probe) |
| 43 | return isa_driver->probe(dev, to_isa_dev(dev)->id); |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static int isa_bus_remove(struct device *dev) |
| 49 | { |
| 50 | struct isa_driver *isa_driver = dev->platform_data; |
| 51 | |
| 52 | if (isa_driver->remove) |
| 53 | return isa_driver->remove(dev, to_isa_dev(dev)->id); |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | static void isa_bus_shutdown(struct device *dev) |
| 59 | { |
| 60 | struct isa_driver *isa_driver = dev->platform_data; |
| 61 | |
| 62 | if (isa_driver->shutdown) |
| 63 | isa_driver->shutdown(dev, to_isa_dev(dev)->id); |
| 64 | } |
| 65 | |
| 66 | static int isa_bus_suspend(struct device *dev, pm_message_t state) |
| 67 | { |
| 68 | struct isa_driver *isa_driver = dev->platform_data; |
| 69 | |
| 70 | if (isa_driver->suspend) |
| 71 | return isa_driver->suspend(dev, to_isa_dev(dev)->id, state); |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static int isa_bus_resume(struct device *dev) |
| 77 | { |
| 78 | struct isa_driver *isa_driver = dev->platform_data; |
| 79 | |
| 80 | if (isa_driver->resume) |
| 81 | return isa_driver->resume(dev, to_isa_dev(dev)->id); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static struct bus_type isa_bus_type = { |
| 87 | .name = "isa", |
| 88 | .match = isa_bus_match, |
| 89 | .probe = isa_bus_probe, |
| 90 | .remove = isa_bus_remove, |
| 91 | .shutdown = isa_bus_shutdown, |
| 92 | .suspend = isa_bus_suspend, |
| 93 | .resume = isa_bus_resume |
| 94 | }; |
| 95 | |
| 96 | static void isa_dev_release(struct device *dev) |
| 97 | { |
| 98 | kfree(to_isa_dev(dev)); |
| 99 | } |
| 100 | |
| 101 | void isa_unregister_driver(struct isa_driver *isa_driver) |
| 102 | { |
| 103 | struct device *dev = isa_driver->devices; |
| 104 | |
| 105 | while (dev) { |
| 106 | struct device *tmp = to_isa_dev(dev)->next; |
| 107 | device_unregister(dev); |
| 108 | dev = tmp; |
| 109 | } |
| 110 | driver_unregister(&isa_driver->driver); |
| 111 | } |
| 112 | EXPORT_SYMBOL_GPL(isa_unregister_driver); |
| 113 | |
| 114 | int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev) |
| 115 | { |
| 116 | int error; |
| 117 | unsigned int id; |
| 118 | |
| 119 | isa_driver->driver.bus = &isa_bus_type; |
| 120 | isa_driver->devices = NULL; |
| 121 | |
| 122 | error = driver_register(&isa_driver->driver); |
| 123 | if (error) |
| 124 | return error; |
| 125 | |
| 126 | for (id = 0; id < ndev; id++) { |
| 127 | struct isa_dev *isa_dev; |
| 128 | |
| 129 | isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL); |
| 130 | if (!isa_dev) { |
| 131 | error = -ENOMEM; |
| 132 | break; |
| 133 | } |
| 134 | |
| 135 | isa_dev->dev.parent = &isa_bus; |
| 136 | isa_dev->dev.bus = &isa_bus_type; |
| 137 | |
| 138 | dev_set_name(&isa_dev->dev, "%s.%u", |
| 139 | isa_driver->driver.name, id); |
| 140 | isa_dev->dev.platform_data = isa_driver; |
| 141 | isa_dev->dev.release = isa_dev_release; |
| 142 | isa_dev->id = id; |
| 143 | |
| 144 | isa_dev->dev.coherent_dma_mask = DMA_BIT_MASK(24); |
| 145 | isa_dev->dev.dma_mask = &isa_dev->dev.coherent_dma_mask; |
| 146 | |
| 147 | error = device_register(&isa_dev->dev); |
| 148 | if (error) { |
| 149 | put_device(&isa_dev->dev); |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | if (isa_dev->dev.platform_data) { |
| 154 | isa_dev->next = isa_driver->devices; |
| 155 | isa_driver->devices = &isa_dev->dev; |
| 156 | } else |
| 157 | device_unregister(&isa_dev->dev); |
| 158 | } |
| 159 | |
| 160 | if (!error && !isa_driver->devices) |
| 161 | error = -ENODEV; |
| 162 | |
| 163 | if (error) |
| 164 | isa_unregister_driver(isa_driver); |
| 165 | |
| 166 | return error; |
| 167 | } |
| 168 | EXPORT_SYMBOL_GPL(isa_register_driver); |
| 169 | |
| 170 | static int __init isa_bus_init(void) |
| 171 | { |
| 172 | int error; |
| 173 | |
| 174 | error = bus_register(&isa_bus_type); |
| 175 | if (!error) { |
| 176 | error = device_register(&isa_bus); |
| 177 | if (error) |
| 178 | bus_unregister(&isa_bus_type); |
| 179 | } |
| 180 | return error; |
| 181 | } |
| 182 | |
| 183 | device_initcall(isa_bus_init); |
| 184 |
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Tags:
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