1 /* 2 * linux/drivers/mmc/core/sdio_bus.c 3 * 4 * Copyright 2007 Pierre Ossman 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or (at 9 * your option) any later version. 10 * 11 * SDIO function driver model 12 */ 13 14 #include <linux/device.h> 15 #include <linux/err.h> 16 17 #include <linux/mmc/card.h> 18 #include <linux/mmc/sdio_func.h> 19 20 #include "sdio_cis.h" 21 #include "sdio_bus.h" 22 23 /* show configuration fields */ 24 #define sdio_config_attr(field, format_string) \ 25 static ssize_t \ 26 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 27 { \ 28 struct sdio_func *func; \ 29 \ 30 func = dev_to_sdio_func (dev); \ 31 return sprintf (buf, format_string, func->field); \ 32 } 33 34 sdio_config_attr(class, "0x%02x\n"); 35 sdio_config_attr(vendor, "0x%04x\n"); 36 sdio_config_attr(device, "0x%04x\n"); 37 38 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 39 { 40 struct sdio_func *func = dev_to_sdio_func (dev); 41 42 return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n", 43 func->class, func->vendor, func->device); 44 } 45 46 static struct device_attribute sdio_dev_attrs[] = { 47 __ATTR_RO(class), 48 __ATTR_RO(vendor), 49 __ATTR_RO(device), 50 __ATTR_RO(modalias), 51 __ATTR_NULL, 52 }; 53 54 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func, 55 const struct sdio_device_id *id) 56 { 57 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class) 58 return NULL; 59 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor) 60 return NULL; 61 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device) 62 return NULL; 63 return id; 64 } 65 66 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func, 67 struct sdio_driver *sdrv) 68 { 69 const struct sdio_device_id *ids; 70 71 ids = sdrv->id_table; 72 73 if (ids) { 74 while (ids->class || ids->vendor || ids->device) { 75 if (sdio_match_one(func, ids)) 76 return ids; 77 ids++; 78 } 79 } 80 81 return NULL; 82 } 83 84 static int sdio_bus_match(struct device *dev, struct device_driver *drv) 85 { 86 struct sdio_func *func = dev_to_sdio_func(dev); 87 struct sdio_driver *sdrv = to_sdio_driver(drv); 88 89 if (sdio_match_device(func, sdrv)) 90 return 1; 91 92 return 0; 93 } 94 95 static int 96 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 97 { 98 struct sdio_func *func = dev_to_sdio_func(dev); 99 100 if (add_uevent_var(env, 101 "SDIO_CLASS=%02X", func->class)) 102 return -ENOMEM; 103 104 if (add_uevent_var(env, 105 "SDIO_ID=%04X:%04X", func->vendor, func->device)) 106 return -ENOMEM; 107 108 if (add_uevent_var(env, 109 "MODALIAS=sdio:c%02Xv%04Xd%04X", 110 func->class, func->vendor, func->device)) 111 return -ENOMEM; 112 113 return 0; 114 } 115 116 static int sdio_bus_probe(struct device *dev) 117 { 118 struct sdio_driver *drv = to_sdio_driver(dev->driver); 119 struct sdio_func *func = dev_to_sdio_func(dev); 120 const struct sdio_device_id *id; 121 int ret; 122 123 id = sdio_match_device(func, drv); 124 if (!id) 125 return -ENODEV; 126 127 /* Set the default block size so the driver is sure it's something 128 * sensible. */ 129 sdio_claim_host(func); 130 ret = sdio_set_block_size(func, 0); 131 sdio_release_host(func); 132 if (ret) 133 return ret; 134 135 return drv->probe(func, id); 136 } 137 138 static int sdio_bus_remove(struct device *dev) 139 { 140 struct sdio_driver *drv = to_sdio_driver(dev->driver); 141 struct sdio_func *func = dev_to_sdio_func(dev); 142 143 drv->remove(func); 144 145 if (func->irq_handler) { 146 printk(KERN_WARNING "WARNING: driver %s did not remove " 147 "its interrupt handler!\n", drv->name); 148 sdio_claim_host(func); 149 sdio_release_irq(func); 150 sdio_release_host(func); 151 } 152 153 return 0; 154 } 155 156 static struct bus_type sdio_bus_type = { 157 .name = "sdio", 158 .dev_attrs = sdio_dev_attrs, 159 .match = sdio_bus_match, 160 .uevent = sdio_bus_uevent, 161 .probe = sdio_bus_probe, 162 .remove = sdio_bus_remove, 163 }; 164 165 int sdio_register_bus(void) 166 { 167 return bus_register(&sdio_bus_type); 168 } 169 170 void sdio_unregister_bus(void) 171 { 172 bus_unregister(&sdio_bus_type); 173 } 174 175 /** 176 * sdio_register_driver - register a function driver 177 * @drv: SDIO function driver 178 */ 179 int sdio_register_driver(struct sdio_driver *drv) 180 { 181 drv->drv.name = drv->name; 182 drv->drv.bus = &sdio_bus_type; 183 return driver_register(&drv->drv); 184 } 185 EXPORT_SYMBOL_GPL(sdio_register_driver); 186 187 /** 188 * sdio_unregister_driver - unregister a function driver 189 * @drv: SDIO function driver 190 */ 191 void sdio_unregister_driver(struct sdio_driver *drv) 192 { 193 drv->drv.bus = &sdio_bus_type; 194 driver_unregister(&drv->drv); 195 } 196 EXPORT_SYMBOL_GPL(sdio_unregister_driver); 197 198 static void sdio_release_func(struct device *dev) 199 { 200 struct sdio_func *func = dev_to_sdio_func(dev); 201 202 sdio_free_func_cis(func); 203 204 if (func->info) 205 kfree(func->info); 206 207 kfree(func); 208 } 209 210 /* 211 * Allocate and initialise a new SDIO function structure. 212 */ 213 struct sdio_func *sdio_alloc_func(struct mmc_card *card) 214 { 215 struct sdio_func *func; 216 217 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL); 218 if (!func) 219 return ERR_PTR(-ENOMEM); 220 221 func->card = card; 222 223 device_initialize(&func->dev); 224 225 func->dev.parent = &card->dev; 226 func->dev.bus = &sdio_bus_type; 227 func->dev.release = sdio_release_func; 228 229 return func; 230 } 231 232 /* 233 * Register a new SDIO function with the driver model. 234 */ 235 int sdio_add_func(struct sdio_func *func) 236 { 237 int ret; 238 239 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num); 240 241 ret = device_add(&func->dev); 242 if (ret == 0) 243 sdio_func_set_present(func); 244 245 return ret; 246 } 247 248 /* 249 * Unregister a SDIO function with the driver model, and 250 * (eventually) free it. 251 * This function can be called through error paths where sdio_add_func() was 252 * never executed (because a failure occurred at an earlier point). 253 */ 254 void sdio_remove_func(struct sdio_func *func) 255 { 256 if (!sdio_func_present(func)) 257 return; 258 259 device_del(&func->dev); 260 put_device(&func->dev); 261 } 262 263