1aa613de6SDmitry Baryshkov /* 2aa613de6SDmitry Baryshkov * drivers/mfd/mfd-core.c 3aa613de6SDmitry Baryshkov * 4aa613de6SDmitry Baryshkov * core MFD support 5aa613de6SDmitry Baryshkov * Copyright (c) 2006 Ian Molton 6aa613de6SDmitry Baryshkov * Copyright (c) 2007,2008 Dmitry Baryshkov 7aa613de6SDmitry Baryshkov * 8aa613de6SDmitry Baryshkov * This program is free software; you can redistribute it and/or modify 9aa613de6SDmitry Baryshkov * it under the terms of the GNU General Public License version 2 as 10aa613de6SDmitry Baryshkov * published by the Free Software Foundation. 11aa613de6SDmitry Baryshkov * 12aa613de6SDmitry Baryshkov */ 13aa613de6SDmitry Baryshkov 14aa613de6SDmitry Baryshkov #include <linux/kernel.h> 15aa613de6SDmitry Baryshkov #include <linux/platform_device.h> 1691fededeSSamuel Ortiz #include <linux/acpi.h> 17aa613de6SDmitry Baryshkov #include <linux/mfd/core.h> 184c90aa94SMark Brown #include <linux/pm_runtime.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 20aa613de6SDmitry Baryshkov 211e29af62SAndres Salomon int mfd_shared_cell_enable(struct platform_device *pdev) 221e29af62SAndres Salomon { 231e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 241e29af62SAndres Salomon int err = 0; 251e29af62SAndres Salomon 261e29af62SAndres Salomon /* only call enable hook if the cell wasn't previously enabled */ 271e29af62SAndres Salomon if (atomic_inc_return(cell->usage_count) == 1) 281e29af62SAndres Salomon err = cell->enable(pdev); 291e29af62SAndres Salomon 301e29af62SAndres Salomon /* if the enable hook failed, decrement counter to allow retries */ 311e29af62SAndres Salomon if (err) 321e29af62SAndres Salomon atomic_dec(cell->usage_count); 331e29af62SAndres Salomon 341e29af62SAndres Salomon return err; 351e29af62SAndres Salomon } 361e29af62SAndres Salomon EXPORT_SYMBOL(mfd_shared_cell_enable); 371e29af62SAndres Salomon 381e29af62SAndres Salomon int mfd_shared_cell_disable(struct platform_device *pdev) 391e29af62SAndres Salomon { 401e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 411e29af62SAndres Salomon int err = 0; 421e29af62SAndres Salomon 431e29af62SAndres Salomon /* only disable if no other clients are using it */ 441e29af62SAndres Salomon if (atomic_dec_return(cell->usage_count) == 0) 451e29af62SAndres Salomon err = cell->disable(pdev); 461e29af62SAndres Salomon 471e29af62SAndres Salomon /* if the disable hook failed, increment to allow retries */ 481e29af62SAndres Salomon if (err) 491e29af62SAndres Salomon atomic_inc(cell->usage_count); 501e29af62SAndres Salomon 511e29af62SAndres Salomon /* sanity check; did someone call disable too many times? */ 521e29af62SAndres Salomon WARN_ON(atomic_read(cell->usage_count) < 0); 531e29af62SAndres Salomon 541e29af62SAndres Salomon return err; 551e29af62SAndres Salomon } 561e29af62SAndres Salomon EXPORT_SYMBOL(mfd_shared_cell_disable); 571e29af62SAndres Salomon 58424f525aSDmitry Baryshkov static int mfd_add_device(struct device *parent, int id, 59aa613de6SDmitry Baryshkov const struct mfd_cell *cell, 60aa613de6SDmitry Baryshkov struct resource *mem_base, 61aa613de6SDmitry Baryshkov int irq_base) 62aa613de6SDmitry Baryshkov { 63a87903f3SIan Molton struct resource *res; 64aa613de6SDmitry Baryshkov struct platform_device *pdev; 65aa613de6SDmitry Baryshkov int ret = -ENOMEM; 66aa613de6SDmitry Baryshkov int r; 67aa613de6SDmitry Baryshkov 683bed6e41SMark Brown pdev = platform_device_alloc(cell->name, id + cell->id); 69aa613de6SDmitry Baryshkov if (!pdev) 70aa613de6SDmitry Baryshkov goto fail_alloc; 71aa613de6SDmitry Baryshkov 72a87903f3SIan Molton res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 73a87903f3SIan Molton if (!res) 74a87903f3SIan Molton goto fail_device; 75a87903f3SIan Molton 76424f525aSDmitry Baryshkov pdev->dev.parent = parent; 77aa613de6SDmitry Baryshkov 78fe891a00SAndres Salomon ret = platform_device_add_data(pdev, cell, sizeof(*cell)); 79aa613de6SDmitry Baryshkov if (ret) 80a87903f3SIan Molton goto fail_res; 81aa613de6SDmitry Baryshkov 82aa613de6SDmitry Baryshkov for (r = 0; r < cell->num_resources; r++) { 83aa613de6SDmitry Baryshkov res[r].name = cell->resources[r].name; 84aa613de6SDmitry Baryshkov res[r].flags = cell->resources[r].flags; 85aa613de6SDmitry Baryshkov 86aa613de6SDmitry Baryshkov /* Find out base to use */ 87f03cfcbcSSamuel Ortiz if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 88aa613de6SDmitry Baryshkov res[r].parent = mem_base; 89aa613de6SDmitry Baryshkov res[r].start = mem_base->start + 90aa613de6SDmitry Baryshkov cell->resources[r].start; 91aa613de6SDmitry Baryshkov res[r].end = mem_base->start + 92aa613de6SDmitry Baryshkov cell->resources[r].end; 93aa613de6SDmitry Baryshkov } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 94aa613de6SDmitry Baryshkov res[r].start = irq_base + 95aa613de6SDmitry Baryshkov cell->resources[r].start; 96aa613de6SDmitry Baryshkov res[r].end = irq_base + 97aa613de6SDmitry Baryshkov cell->resources[r].end; 98aa613de6SDmitry Baryshkov } else { 99aa613de6SDmitry Baryshkov res[r].parent = cell->resources[r].parent; 100aa613de6SDmitry Baryshkov res[r].start = cell->resources[r].start; 101aa613de6SDmitry Baryshkov res[r].end = cell->resources[r].end; 102aa613de6SDmitry Baryshkov } 10391fededeSSamuel Ortiz 1045f2545faSDaniel Drake if (!cell->ignore_resource_conflicts) { 10591fededeSSamuel Ortiz ret = acpi_check_resource_conflict(res); 10691fededeSSamuel Ortiz if (ret) 10791fededeSSamuel Ortiz goto fail_res; 108aa613de6SDmitry Baryshkov } 1095f2545faSDaniel Drake } 110aa613de6SDmitry Baryshkov 1118af5fe3bSAxel Lin ret = platform_device_add_resources(pdev, res, cell->num_resources); 1128af5fe3bSAxel Lin if (ret) 1138af5fe3bSAxel Lin goto fail_res; 114aa613de6SDmitry Baryshkov 115aa613de6SDmitry Baryshkov ret = platform_device_add(pdev); 116aa613de6SDmitry Baryshkov if (ret) 117a87903f3SIan Molton goto fail_res; 118a87903f3SIan Molton 1194c90aa94SMark Brown if (cell->pm_runtime_no_callbacks) 1204c90aa94SMark Brown pm_runtime_no_callbacks(&pdev->dev); 1214c90aa94SMark Brown 122a87903f3SIan Molton kfree(res); 123aa613de6SDmitry Baryshkov 124aa613de6SDmitry Baryshkov return 0; 125aa613de6SDmitry Baryshkov 126aa613de6SDmitry Baryshkov /* platform_device_del(pdev); */ 127a87903f3SIan Molton fail_res: 128a87903f3SIan Molton kfree(res); 129aa613de6SDmitry Baryshkov fail_device: 130aa613de6SDmitry Baryshkov platform_device_put(pdev); 131aa613de6SDmitry Baryshkov fail_alloc: 132aa613de6SDmitry Baryshkov return ret; 133aa613de6SDmitry Baryshkov } 134aa613de6SDmitry Baryshkov 135424f525aSDmitry Baryshkov int mfd_add_devices(struct device *parent, int id, 1361e29af62SAndres Salomon struct mfd_cell *cells, int n_devs, 137aa613de6SDmitry Baryshkov struct resource *mem_base, 138aa613de6SDmitry Baryshkov int irq_base) 139aa613de6SDmitry Baryshkov { 140aa613de6SDmitry Baryshkov int i; 141aa613de6SDmitry Baryshkov int ret = 0; 1421e29af62SAndres Salomon atomic_t *cnts; 1431e29af62SAndres Salomon 1441e29af62SAndres Salomon /* initialize reference counting for all cells */ 1451e29af62SAndres Salomon cnts = kcalloc(sizeof(*cnts), n_devs, GFP_KERNEL); 1461e29af62SAndres Salomon if (!cnts) 1471e29af62SAndres Salomon return -ENOMEM; 148aa613de6SDmitry Baryshkov 149aa613de6SDmitry Baryshkov for (i = 0; i < n_devs; i++) { 1501e29af62SAndres Salomon atomic_set(&cnts[i], 0); 1511e29af62SAndres Salomon cells[i].usage_count = &cnts[i]; 152424f525aSDmitry Baryshkov ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 153aa613de6SDmitry Baryshkov if (ret) 154aa613de6SDmitry Baryshkov break; 155aa613de6SDmitry Baryshkov } 156aa613de6SDmitry Baryshkov 157aa613de6SDmitry Baryshkov if (ret) 158aa613de6SDmitry Baryshkov mfd_remove_devices(parent); 159aa613de6SDmitry Baryshkov 160aa613de6SDmitry Baryshkov return ret; 161aa613de6SDmitry Baryshkov } 162aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_add_devices); 163aa613de6SDmitry Baryshkov 1641e29af62SAndres Salomon static int mfd_remove_devices_fn(struct device *dev, void *c) 165aa613de6SDmitry Baryshkov { 1661e29af62SAndres Salomon struct platform_device *pdev = to_platform_device(dev); 1671e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 1681e29af62SAndres Salomon atomic_t **usage_count = c; 1691e29af62SAndres Salomon 1701e29af62SAndres Salomon /* find the base address of usage_count pointers (for freeing) */ 1711e29af62SAndres Salomon if (!*usage_count || (cell->usage_count < *usage_count)) 1721e29af62SAndres Salomon *usage_count = cell->usage_count; 1731e29af62SAndres Salomon 1741e29af62SAndres Salomon platform_device_unregister(pdev); 175aa613de6SDmitry Baryshkov return 0; 176aa613de6SDmitry Baryshkov } 177aa613de6SDmitry Baryshkov 178424f525aSDmitry Baryshkov void mfd_remove_devices(struct device *parent) 179aa613de6SDmitry Baryshkov { 1801e29af62SAndres Salomon atomic_t *cnts = NULL; 1811e29af62SAndres Salomon 1821e29af62SAndres Salomon device_for_each_child(parent, &cnts, mfd_remove_devices_fn); 1831e29af62SAndres Salomon kfree(cnts); 184aa613de6SDmitry Baryshkov } 185aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_remove_devices); 186aa613de6SDmitry Baryshkov 187a9bbba99SAndres Salomon static int add_shared_platform_device(const char *cell, const char *name) 188a9bbba99SAndres Salomon { 189a9bbba99SAndres Salomon struct mfd_cell cell_entry; 190a9bbba99SAndres Salomon struct device *dev; 191a9bbba99SAndres Salomon struct platform_device *pdev; 192a9bbba99SAndres Salomon int err; 193a9bbba99SAndres Salomon 194a9bbba99SAndres Salomon /* check if we've already registered a device (don't fail if we have) */ 195a9bbba99SAndres Salomon if (bus_find_device_by_name(&platform_bus_type, NULL, name)) 196a9bbba99SAndres Salomon return 0; 197a9bbba99SAndres Salomon 198a9bbba99SAndres Salomon /* fetch the parent cell's device (should already be registered!) */ 199a9bbba99SAndres Salomon dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); 200a9bbba99SAndres Salomon if (!dev) { 201a9bbba99SAndres Salomon printk(KERN_ERR "failed to find device for cell %s\n", cell); 202a9bbba99SAndres Salomon return -ENODEV; 203a9bbba99SAndres Salomon } 204a9bbba99SAndres Salomon pdev = to_platform_device(dev); 205a9bbba99SAndres Salomon memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); 206a9bbba99SAndres Salomon 207a9bbba99SAndres Salomon WARN_ON(!cell_entry.enable); 208a9bbba99SAndres Salomon 209a9bbba99SAndres Salomon cell_entry.name = name; 210a9bbba99SAndres Salomon err = mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0); 211a9bbba99SAndres Salomon if (err) 212a9bbba99SAndres Salomon dev_err(dev, "MFD add devices failed: %d\n", err); 213a9bbba99SAndres Salomon return err; 214a9bbba99SAndres Salomon } 215a9bbba99SAndres Salomon 216a9bbba99SAndres Salomon int mfd_shared_platform_driver_register(struct platform_driver *drv, 217a9bbba99SAndres Salomon const char *cellname) 218a9bbba99SAndres Salomon { 219a9bbba99SAndres Salomon int err; 220a9bbba99SAndres Salomon 221a9bbba99SAndres Salomon err = add_shared_platform_device(cellname, drv->driver.name); 222a9bbba99SAndres Salomon if (err) 223a9bbba99SAndres Salomon printk(KERN_ERR "failed to add platform device %s\n", 224a9bbba99SAndres Salomon drv->driver.name); 225a9bbba99SAndres Salomon 226a9bbba99SAndres Salomon err = platform_driver_register(drv); 227a9bbba99SAndres Salomon if (err) 228a9bbba99SAndres Salomon printk(KERN_ERR "failed to add platform driver %s\n", 229a9bbba99SAndres Salomon drv->driver.name); 230a9bbba99SAndres Salomon 231a9bbba99SAndres Salomon return err; 232a9bbba99SAndres Salomon } 233a9bbba99SAndres Salomon EXPORT_SYMBOL(mfd_shared_platform_driver_register); 234a9bbba99SAndres Salomon 235a9bbba99SAndres Salomon void mfd_shared_platform_driver_unregister(struct platform_driver *drv) 236a9bbba99SAndres Salomon { 237a9bbba99SAndres Salomon struct device *dev; 238a9bbba99SAndres Salomon 239a9bbba99SAndres Salomon dev = bus_find_device_by_name(&platform_bus_type, NULL, 240a9bbba99SAndres Salomon drv->driver.name); 241a9bbba99SAndres Salomon if (dev) 242a9bbba99SAndres Salomon platform_device_unregister(to_platform_device(dev)); 243a9bbba99SAndres Salomon 244a9bbba99SAndres Salomon platform_driver_unregister(drv); 245a9bbba99SAndres Salomon } 246a9bbba99SAndres Salomon EXPORT_SYMBOL(mfd_shared_platform_driver_unregister); 247a9bbba99SAndres Salomon 248aa613de6SDmitry Baryshkov MODULE_LICENSE("GPL"); 249aa613de6SDmitry Baryshkov MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 250