1 #include <linux/module.h> 2 #include <linux/interrupt.h> 3 #include <linux/device.h> 4 #include <linux/gfp.h> 5 #include <linux/irq.h> 6 7 #include "internals.h" 8 9 /* 10 * Device resource management aware IRQ request/free implementation. 11 */ 12 struct irq_devres { 13 unsigned int irq; 14 void *dev_id; 15 }; 16 17 static void devm_irq_release(struct device *dev, void *res) 18 { 19 struct irq_devres *this = res; 20 21 free_irq(this->irq, this->dev_id); 22 } 23 24 static int devm_irq_match(struct device *dev, void *res, void *data) 25 { 26 struct irq_devres *this = res, *match = data; 27 28 return this->irq == match->irq && this->dev_id == match->dev_id; 29 } 30 31 /** 32 * devm_request_threaded_irq - allocate an interrupt line for a managed device 33 * @dev: device to request interrupt for 34 * @irq: Interrupt line to allocate 35 * @handler: Function to be called when the IRQ occurs 36 * @thread_fn: function to be called in a threaded interrupt context. NULL 37 * for devices which handle everything in @handler 38 * @irqflags: Interrupt type flags 39 * @devname: An ascii name for the claiming device, dev_name(dev) if NULL 40 * @dev_id: A cookie passed back to the handler function 41 * 42 * Except for the extra @dev argument, this function takes the 43 * same arguments and performs the same function as 44 * request_threaded_irq(). IRQs requested with this function will be 45 * automatically freed on driver detach. 46 * 47 * If an IRQ allocated with this function needs to be freed 48 * separately, devm_free_irq() must be used. 49 */ 50 int devm_request_threaded_irq(struct device *dev, unsigned int irq, 51 irq_handler_t handler, irq_handler_t thread_fn, 52 unsigned long irqflags, const char *devname, 53 void *dev_id) 54 { 55 struct irq_devres *dr; 56 int rc; 57 58 dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres), 59 GFP_KERNEL); 60 if (!dr) 61 return -ENOMEM; 62 63 if (!devname) 64 devname = dev_name(dev); 65 66 rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname, 67 dev_id); 68 if (rc) { 69 devres_free(dr); 70 return rc; 71 } 72 73 dr->irq = irq; 74 dr->dev_id = dev_id; 75 devres_add(dev, dr); 76 77 return 0; 78 } 79 EXPORT_SYMBOL(devm_request_threaded_irq); 80 81 /** 82 * devm_request_any_context_irq - allocate an interrupt line for a managed device 83 * @dev: device to request interrupt for 84 * @irq: Interrupt line to allocate 85 * @handler: Function to be called when the IRQ occurs 86 * @thread_fn: function to be called in a threaded interrupt context. NULL 87 * for devices which handle everything in @handler 88 * @irqflags: Interrupt type flags 89 * @devname: An ascii name for the claiming device, dev_name(dev) if NULL 90 * @dev_id: A cookie passed back to the handler function 91 * 92 * Except for the extra @dev argument, this function takes the 93 * same arguments and performs the same function as 94 * request_any_context_irq(). IRQs requested with this function will be 95 * automatically freed on driver detach. 96 * 97 * If an IRQ allocated with this function needs to be freed 98 * separately, devm_free_irq() must be used. 99 */ 100 int devm_request_any_context_irq(struct device *dev, unsigned int irq, 101 irq_handler_t handler, unsigned long irqflags, 102 const char *devname, void *dev_id) 103 { 104 struct irq_devres *dr; 105 int rc; 106 107 dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres), 108 GFP_KERNEL); 109 if (!dr) 110 return -ENOMEM; 111 112 if (!devname) 113 devname = dev_name(dev); 114 115 rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id); 116 if (rc < 0) { 117 devres_free(dr); 118 return rc; 119 } 120 121 dr->irq = irq; 122 dr->dev_id = dev_id; 123 devres_add(dev, dr); 124 125 return rc; 126 } 127 EXPORT_SYMBOL(devm_request_any_context_irq); 128 129 /** 130 * devm_free_irq - free an interrupt 131 * @dev: device to free interrupt for 132 * @irq: Interrupt line to free 133 * @dev_id: Device identity to free 134 * 135 * Except for the extra @dev argument, this function takes the 136 * same arguments and performs the same function as free_irq(). 137 * This function instead of free_irq() should be used to manually 138 * free IRQs allocated with devm_request_irq(). 139 */ 140 void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id) 141 { 142 struct irq_devres match_data = { irq, dev_id }; 143 144 WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match, 145 &match_data)); 146 free_irq(irq, dev_id); 147 } 148 EXPORT_SYMBOL(devm_free_irq); 149 150 struct irq_desc_devres { 151 unsigned int from; 152 unsigned int cnt; 153 }; 154 155 static void devm_irq_desc_release(struct device *dev, void *res) 156 { 157 struct irq_desc_devres *this = res; 158 159 irq_free_descs(this->from, this->cnt); 160 } 161 162 /** 163 * __devm_irq_alloc_descs - Allocate and initialize a range of irq descriptors 164 * for a managed device 165 * @dev: Device to allocate the descriptors for 166 * @irq: Allocate for specific irq number if irq >= 0 167 * @from: Start the search from this irq number 168 * @cnt: Number of consecutive irqs to allocate 169 * @node: Preferred node on which the irq descriptor should be allocated 170 * @owner: Owning module (can be NULL) 171 * @affinity: Optional pointer to an affinity mask array of size @cnt 172 * which hints where the irq descriptors should be allocated 173 * and which default affinities to use 174 * 175 * Returns the first irq number or error code. 176 * 177 * Note: Use the provided wrappers (devm_irq_alloc_desc*) for simplicity. 178 */ 179 int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from, 180 unsigned int cnt, int node, struct module *owner, 181 const struct cpumask *affinity) 182 { 183 struct irq_desc_devres *dr; 184 int base; 185 186 dr = devres_alloc(devm_irq_desc_release, sizeof(*dr), GFP_KERNEL); 187 if (!dr) 188 return -ENOMEM; 189 190 base = __irq_alloc_descs(irq, from, cnt, node, owner, affinity); 191 if (base < 0) { 192 devres_free(dr); 193 return base; 194 } 195 196 dr->from = base; 197 dr->cnt = cnt; 198 devres_add(dev, dr); 199 200 return base; 201 } 202 EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs); 203 204 #ifdef CONFIG_GENERIC_IRQ_CHIP 205 /** 206 * devm_irq_alloc_generic_chip - Allocate and initialize a generic chip 207 * for a managed device 208 * @dev: Device to allocate the generic chip for 209 * @name: Name of the irq chip 210 * @num_ct: Number of irq_chip_type instances associated with this 211 * @irq_base: Interrupt base nr for this chip 212 * @reg_base: Register base address (virtual) 213 * @handler: Default flow handler associated with this chip 214 * 215 * Returns an initialized irq_chip_generic structure. The chip defaults 216 * to the primary (index 0) irq_chip_type and @handler 217 */ 218 struct irq_chip_generic * 219 devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct, 220 unsigned int irq_base, void __iomem *reg_base, 221 irq_flow_handler_t handler) 222 { 223 struct irq_chip_generic *gc; 224 unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type); 225 226 gc = devm_kzalloc(dev, sz, GFP_KERNEL); 227 if (gc) 228 irq_init_generic_chip(gc, name, num_ct, 229 irq_base, reg_base, handler); 230 231 return gc; 232 } 233 EXPORT_SYMBOL_GPL(devm_irq_alloc_generic_chip); 234 235 struct irq_generic_chip_devres { 236 struct irq_chip_generic *gc; 237 u32 msk; 238 unsigned int clr; 239 unsigned int set; 240 }; 241 242 static void devm_irq_remove_generic_chip(struct device *dev, void *res) 243 { 244 struct irq_generic_chip_devres *this = res; 245 246 irq_remove_generic_chip(this->gc, this->msk, this->clr, this->set); 247 } 248 249 /** 250 * devm_irq_setup_generic_chip - Setup a range of interrupts with a generic 251 * chip for a managed device 252 * 253 * @dev: Device to setup the generic chip for 254 * @gc: Generic irq chip holding all data 255 * @msk: Bitmask holding the irqs to initialize relative to gc->irq_base 256 * @flags: Flags for initialization 257 * @clr: IRQ_* bits to clear 258 * @set: IRQ_* bits to set 259 * 260 * Set up max. 32 interrupts starting from gc->irq_base. Note, this 261 * initializes all interrupts to the primary irq_chip_type and its 262 * associated handler. 263 */ 264 int devm_irq_setup_generic_chip(struct device *dev, struct irq_chip_generic *gc, 265 u32 msk, enum irq_gc_flags flags, 266 unsigned int clr, unsigned int set) 267 { 268 struct irq_generic_chip_devres *dr; 269 270 dr = devres_alloc(devm_irq_remove_generic_chip, 271 sizeof(*dr), GFP_KERNEL); 272 if (!dr) 273 return -ENOMEM; 274 275 irq_setup_generic_chip(gc, msk, flags, clr, set); 276 277 dr->gc = gc; 278 dr->msk = msk; 279 dr->clr = clr; 280 dr->set = set; 281 devres_add(dev, dr); 282 283 return 0; 284 } 285 EXPORT_SYMBOL_GPL(devm_irq_setup_generic_chip); 286 #endif /* CONFIG_GENERIC_IRQ_CHIP */ 287