drivers/mfd/mfd-core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * drivers/mfd/mfd-core.c
   4  *
   5  * core MFD support
   6  * Copyright (c) 2006 Ian Molton
   7  * Copyright (c) 2007,2008 Dmitry Baryshkov
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/acpi.h>
  13 #include <linux/property.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/irqdomain.h>
  19 #include <linux/of.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 static struct device_type mfd_dev_type = {
  23         .name   = "mfd_device",
  24 };
  25
  26 int mfd_cell_enable(struct platform_device *pdev)
  27 {
  28         const struct mfd_cell *cell = mfd_get_cell(pdev);
  29
  30         if (!cell->enable) {
  31                 dev_dbg(&pdev->dev, "No .enable() call-back registered\n");
  32                 return 0;
  33         }
  34
  35         return cell->enable(pdev);
  36 }
  37 EXPORT_SYMBOL(mfd_cell_enable);
  38
  39 int mfd_cell_disable(struct platform_device *pdev)
  40 {
  41         const struct mfd_cell *cell = mfd_get_cell(pdev);
  42
  43         if (!cell->disable) {
  44                 dev_dbg(&pdev->dev, "No .disable() call-back registered\n");
  45                 return 0;
  46         }
  47
  48         return cell->disable(pdev);
  49 }
  50 EXPORT_SYMBOL(mfd_cell_disable);
  51
  52 #if IS_ENABLED(CONFIG_ACPI)
  53 static void mfd_acpi_add_device(const struct mfd_cell *cell,
  54                                 struct platform_device *pdev)
  55 {
  56         const struct mfd_cell_acpi_match *match = cell->acpi_match;
  57         struct acpi_device *parent, *child;
  58         struct acpi_device *adev;
  59
  60         parent = ACPI_COMPANION(pdev->dev.parent);
  61         if (!parent)
  62                 return;
  63
  64         /*
  65          * MFD child device gets its ACPI handle either from the ACPI device
  66          * directly under the parent that matches the either _HID or _CID, or
  67          * _ADR or it will use the parent handle if is no ID is given.
  68          *
  69          * Note that use of _ADR is a grey area in the ACPI specification,
  70          * though Intel Galileo Gen2 is using it to distinguish the children
  71          * devices.
  72          */
  73         adev = parent;
  74         if (match) {
  75                 if (match->pnpid) {
  76                         struct acpi_device_id ids[2] = {};
  77
  78                         strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
  79                         list_for_each_entry(child, &parent->children, node) {
  80                                 if (!acpi_match_device_ids(child, ids)) {
  81                                         adev = child;
  82                                         break;
  83                                 }
  84                         }
  85                 } else {
  86                         unsigned long long adr;
  87                         acpi_status status;
  88
  89                         list_for_each_entry(child, &parent->children, node) {
  90                                 status = acpi_evaluate_integer(child->handle,
  91                                                                "_ADR", NULL,
  92                                                                &adr);
  93                                 if (ACPI_SUCCESS(status) && match->adr == adr) {
  94                                         adev = child;
  95                                         break;
  96                                 }
  97                         }
  98                 }
  99         }
 100
 101         ACPI_COMPANION_SET(&pdev->dev, adev);
 102 }
 103 #else
 104 static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
 105                                        struct platform_device *pdev)
 106 {
 107 }
 108 #endif
 109
 110 static int mfd_add_device(struct device *parent, int id,
 111                           const struct mfd_cell *cell,
 112                           struct resource *mem_base,
 113                           int irq_base, struct irq_domain *domain)
 114 {
 115         struct resource *res;
 116         struct platform_device *pdev;
 117         struct device_node *np = NULL;
 118         int ret = -ENOMEM;
 119         int platform_id;
 120         int r;
 121
 122         if (id == PLATFORM_DEVID_AUTO)
 123                 platform_id = id;
 124         else
 125                 platform_id = id + cell->id;
 126
 127         pdev = platform_device_alloc(cell->name, platform_id);
 128         if (!pdev)
 129                 goto fail_alloc;
 130
 131         pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
 132         if (!pdev->mfd_cell)
 133                 goto fail_device;
 134
 135         res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
 136         if (!res)
 137                 goto fail_device;
 138
 139         pdev->dev.parent = parent;
 140         pdev->dev.type = &mfd_dev_type;
 141         pdev->dev.dma_mask = parent->dma_mask;
 142         pdev->dev.dma_parms = parent->dma_parms;
 143         pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
 144
 145         ret = regulator_bulk_register_supply_alias(
 146                         &pdev->dev, cell->parent_supplies,
 147                         parent, cell->parent_supplies,
 148                         cell->num_parent_supplies);
 149         if (ret < 0)
 150                 goto fail_res;
 151
 152         if (parent->of_node && cell->of_compatible) {
 153                 for_each_child_of_node(parent->of_node, np) {
 154                         if (of_device_is_compatible(np, cell->of_compatible)) {
 155                                 if (!of_device_is_available(np)) {
 156                                         /* Ignore disabled devices error free */
 157                                         ret = 0;
 158                                         goto fail_alias;
 159                                 }
 160                                 pdev->dev.of_node = np;
 161                                 pdev->dev.fwnode = &np->fwnode;
 162                                 break;
 163                         }
 164                 }
 165         }
 166
 167         mfd_acpi_add_device(cell, pdev);
 168
 169         if (cell->pdata_size) {
 170                 ret = platform_device_add_data(pdev,
 171                                         cell->platform_data, cell->pdata_size);
 172                 if (ret)
 173                         goto fail_alias;
 174         }
 175
 176         if (cell->properties) {
 177                 ret = platform_device_add_properties(pdev, cell->properties);
 178                 if (ret)
 179                         goto fail_alias;
 180         }
 181
 182         for (r = 0; r < cell->num_resources; r++) {
 183                 res[r].name = cell->resources[r].name;
 184                 res[r].flags = cell->resources[r].flags;
 185
 186                 /* Find out base to use */
 187                 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
 188                         res[r].parent = mem_base;
 189                         res[r].start = mem_base->start +
 190                                 cell->resources[r].start;
 191                         res[r].end = mem_base->start +
 192                                 cell->resources[r].end;
 193                 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
 194                         if (domain) {
 195                                 /* Unable to create mappings for IRQ ranges. */
 196                                 WARN_ON(cell->resources[r].start !=
 197                                         cell->resources[r].end);
 198                                 res[r].start = res[r].end = irq_create_mapping(
 199                                         domain, cell->resources[r].start);
 200                         } else {
 201                                 res[r].start = irq_base +
 202                                         cell->resources[r].start;
 203                                 res[r].end   = irq_base +
 204                                         cell->resources[r].end;
 205                         }
 206                 } else {
 207                         res[r].parent = cell->resources[r].parent;
 208                         res[r].start = cell->resources[r].start;
 209                         res[r].end   = cell->resources[r].end;
 210                 }
 211
 212                 if (!cell->ignore_resource_conflicts) {
 213                         if (has_acpi_companion(&pdev->dev)) {
 214                                 ret = acpi_check_resource_conflict(&res[r]);
 215                                 if (ret)
 216                                         goto fail_alias;
 217                         }
 218                 }
 219         }
 220
 221         ret = platform_device_add_resources(pdev, res, cell->num_resources);
 222         if (ret)
 223                 goto fail_alias;
 224
 225         ret = platform_device_add(pdev);
 226         if (ret)
 227                 goto fail_alias;
 228
 229         if (cell->pm_runtime_no_callbacks)
 230                 pm_runtime_no_callbacks(&pdev->dev);
 231
 232         kfree(res);
 233
 234         return 0;
 235
 236 fail_alias:
 237         regulator_bulk_unregister_supply_alias(&pdev->dev,
 238                                                cell->parent_supplies,
 239                                                cell->num_parent_supplies);
 240 fail_res:
 241         kfree(res);
 242 fail_device:
 243         platform_device_put(pdev);
 244 fail_alloc:
 245         return ret;
 246 }
 247
 248 /**
 249  * mfd_add_devices - register child devices
 250  *
 251  * @parent:     Pointer to parent device.
 252  * @id:         Can be PLATFORM_DEVID_AUTO to let the Platform API take care
 253  *              of device numbering, or will be added to a device's cell_id.
 254  * @cells:      Array of (struct mfd_cell)s describing child devices.
 255  * @n_devs:     Number of child devices to register.
 256  * @mem_base:   Parent register range resource for child devices.
 257  * @irq_base:   Base of the range of virtual interrupt numbers allocated for
 258  *              this MFD device. Unused if @domain is specified.
 259  * @domain:     Interrupt domain to create mappings for hardware interrupts.
 260  */
 261 int mfd_add_devices(struct device *parent, int id,
 262                     const struct mfd_cell *cells, int n_devs,
 263                     struct resource *mem_base,
 264                     int irq_base, struct irq_domain *domain)
 265 {
 266         int i;
 267         int ret;
 268
 269         for (i = 0; i < n_devs; i++) {
 270                 ret = mfd_add_device(parent, id, cells + i, mem_base,
 271                                      irq_base, domain);
 272                 if (ret)
 273                         goto fail;
 274         }
 275
 276         return 0;
 277
 278 fail:
 279         if (i)
 280                 mfd_remove_devices(parent);
 281
 282         return ret;
 283 }
 284 EXPORT_SYMBOL(mfd_add_devices);
 285
 286 static int mfd_remove_devices_fn(struct device *dev, void *data)
 287 {
 288         struct platform_device *pdev;
 289         const struct mfd_cell *cell;
 290
 291         if (dev->type != &mfd_dev_type)
 292                 return 0;
 293
 294         pdev = to_platform_device(dev);
 295         cell = mfd_get_cell(pdev);
 296
 297         regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
 298                                                cell->num_parent_supplies);
 299
 300         platform_device_unregister(pdev);
 301         return 0;
 302 }
 303
 304 void mfd_remove_devices(struct device *parent)
 305 {
 306         device_for_each_child_reverse(parent, NULL, mfd_remove_devices_fn);
 307 }
 308 EXPORT_SYMBOL(mfd_remove_devices);
 309
 310 static void devm_mfd_dev_release(struct device *dev, void *res)
 311 {
 312         mfd_remove_devices(dev);
 313 }
 314
 315 /**
 316  * devm_mfd_add_devices - Resource managed version of mfd_add_devices()
 317  *
 318  * Returns 0 on success or an appropriate negative error number on failure.
 319  * All child-devices of the MFD will automatically be removed when it gets
 320  * unbinded.
 321  */
 322 int devm_mfd_add_devices(struct device *dev, int id,
 323                          const struct mfd_cell *cells, int n_devs,
 324                          struct resource *mem_base,
 325                          int irq_base, struct irq_domain *domain)
 326 {
 327         struct device **ptr;
 328         int ret;
 329
 330         ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
 331         if (!ptr)
 332                 return -ENOMEM;
 333
 334         ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
 335                               irq_base, domain);
 336         if (ret < 0) {
 337                 devres_free(ptr);
 338                 return ret;
 339         }
 340
 341         *ptr = dev;
 342         devres_add(dev, ptr);
 343
 344         return ret;
 345 }
 346 EXPORT_SYMBOL(devm_mfd_add_devices);
 347
 348 MODULE_LICENSE("GPL");
 349 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");