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 21f77289acSAndres Salomon int mfd_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 } 36f77289acSAndres Salomon EXPORT_SYMBOL(mfd_cell_enable); 371e29af62SAndres Salomon 38f77289acSAndres Salomon int mfd_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 } 56f77289acSAndres Salomon EXPORT_SYMBOL(mfd_cell_disable); 571e29af62SAndres Salomon 58e710d7d5SSamuel Ortiz static int mfd_platform_add_cell(struct platform_device *pdev, 59e710d7d5SSamuel Ortiz const struct mfd_cell *cell) 60e710d7d5SSamuel Ortiz { 61e710d7d5SSamuel Ortiz if (!cell) 62e710d7d5SSamuel Ortiz return 0; 63e710d7d5SSamuel Ortiz 64e710d7d5SSamuel Ortiz pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); 65e710d7d5SSamuel Ortiz if (!pdev->mfd_cell) 66e710d7d5SSamuel Ortiz return -ENOMEM; 67e710d7d5SSamuel Ortiz 68e710d7d5SSamuel Ortiz return 0; 69e710d7d5SSamuel Ortiz } 70e710d7d5SSamuel Ortiz 71424f525aSDmitry Baryshkov static int mfd_add_device(struct device *parent, int id, 72aa613de6SDmitry Baryshkov const struct mfd_cell *cell, 73aa613de6SDmitry Baryshkov struct resource *mem_base, 74aa613de6SDmitry Baryshkov int irq_base) 75aa613de6SDmitry Baryshkov { 76a87903f3SIan Molton struct resource *res; 77aa613de6SDmitry Baryshkov struct platform_device *pdev; 78aa613de6SDmitry Baryshkov int ret = -ENOMEM; 79aa613de6SDmitry Baryshkov int r; 80aa613de6SDmitry Baryshkov 813bed6e41SMark Brown pdev = platform_device_alloc(cell->name, id + cell->id); 82aa613de6SDmitry Baryshkov if (!pdev) 83aa613de6SDmitry Baryshkov goto fail_alloc; 84aa613de6SDmitry Baryshkov 85a87903f3SIan Molton res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 86a87903f3SIan Molton if (!res) 87a87903f3SIan Molton goto fail_device; 88a87903f3SIan Molton 89424f525aSDmitry Baryshkov pdev->dev.parent = parent; 90aa613de6SDmitry Baryshkov 91eb895607SSamuel Ortiz if (cell->pdata_size) { 92eb895607SSamuel Ortiz ret = platform_device_add_data(pdev, 93eb895607SSamuel Ortiz cell->platform_data, cell->pdata_size); 94eb895607SSamuel Ortiz if (ret) 95eb895607SSamuel Ortiz goto fail_res; 96eb895607SSamuel Ortiz } 97eb895607SSamuel Ortiz 98e710d7d5SSamuel Ortiz ret = mfd_platform_add_cell(pdev, cell); 99aa613de6SDmitry Baryshkov if (ret) 100a87903f3SIan Molton goto fail_res; 101aa613de6SDmitry Baryshkov 102aa613de6SDmitry Baryshkov for (r = 0; r < cell->num_resources; r++) { 103aa613de6SDmitry Baryshkov res[r].name = cell->resources[r].name; 104aa613de6SDmitry Baryshkov res[r].flags = cell->resources[r].flags; 105aa613de6SDmitry Baryshkov 106aa613de6SDmitry Baryshkov /* Find out base to use */ 107f03cfcbcSSamuel Ortiz if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 108aa613de6SDmitry Baryshkov res[r].parent = mem_base; 109aa613de6SDmitry Baryshkov res[r].start = mem_base->start + 110aa613de6SDmitry Baryshkov cell->resources[r].start; 111aa613de6SDmitry Baryshkov res[r].end = mem_base->start + 112aa613de6SDmitry Baryshkov cell->resources[r].end; 113aa613de6SDmitry Baryshkov } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 114aa613de6SDmitry Baryshkov res[r].start = irq_base + 115aa613de6SDmitry Baryshkov cell->resources[r].start; 116aa613de6SDmitry Baryshkov res[r].end = irq_base + 117aa613de6SDmitry Baryshkov cell->resources[r].end; 118aa613de6SDmitry Baryshkov } else { 119aa613de6SDmitry Baryshkov res[r].parent = cell->resources[r].parent; 120aa613de6SDmitry Baryshkov res[r].start = cell->resources[r].start; 121aa613de6SDmitry Baryshkov res[r].end = cell->resources[r].end; 122aa613de6SDmitry Baryshkov } 12391fededeSSamuel Ortiz 1245f2545faSDaniel Drake if (!cell->ignore_resource_conflicts) { 12591fededeSSamuel Ortiz ret = acpi_check_resource_conflict(res); 12691fededeSSamuel Ortiz if (ret) 12791fededeSSamuel Ortiz goto fail_res; 128aa613de6SDmitry Baryshkov } 1295f2545faSDaniel Drake } 130aa613de6SDmitry Baryshkov 1318af5fe3bSAxel Lin ret = platform_device_add_resources(pdev, res, cell->num_resources); 1328af5fe3bSAxel Lin if (ret) 1338af5fe3bSAxel Lin goto fail_res; 134aa613de6SDmitry Baryshkov 135aa613de6SDmitry Baryshkov ret = platform_device_add(pdev); 136aa613de6SDmitry Baryshkov if (ret) 137a87903f3SIan Molton goto fail_res; 138a87903f3SIan Molton 1394c90aa94SMark Brown if (cell->pm_runtime_no_callbacks) 1404c90aa94SMark Brown pm_runtime_no_callbacks(&pdev->dev); 1414c90aa94SMark Brown 142a87903f3SIan Molton kfree(res); 143aa613de6SDmitry Baryshkov 144aa613de6SDmitry Baryshkov return 0; 145aa613de6SDmitry Baryshkov 146a87903f3SIan Molton fail_res: 147a87903f3SIan Molton kfree(res); 148aa613de6SDmitry Baryshkov fail_device: 149aa613de6SDmitry Baryshkov platform_device_put(pdev); 150aa613de6SDmitry Baryshkov fail_alloc: 151aa613de6SDmitry Baryshkov return ret; 152aa613de6SDmitry Baryshkov } 153aa613de6SDmitry Baryshkov 154424f525aSDmitry Baryshkov int mfd_add_devices(struct device *parent, int id, 1551e29af62SAndres Salomon struct mfd_cell *cells, int n_devs, 156aa613de6SDmitry Baryshkov struct resource *mem_base, 157aa613de6SDmitry Baryshkov int irq_base) 158aa613de6SDmitry Baryshkov { 159aa613de6SDmitry Baryshkov int i; 160aa613de6SDmitry Baryshkov int ret = 0; 1611e29af62SAndres Salomon atomic_t *cnts; 1621e29af62SAndres Salomon 1631e29af62SAndres Salomon /* initialize reference counting for all cells */ 1641e29af62SAndres Salomon cnts = kcalloc(sizeof(*cnts), n_devs, GFP_KERNEL); 1651e29af62SAndres Salomon if (!cnts) 1661e29af62SAndres Salomon return -ENOMEM; 167aa613de6SDmitry Baryshkov 168aa613de6SDmitry Baryshkov for (i = 0; i < n_devs; i++) { 1691e29af62SAndres Salomon atomic_set(&cnts[i], 0); 1701e29af62SAndres Salomon cells[i].usage_count = &cnts[i]; 171424f525aSDmitry Baryshkov ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); 172aa613de6SDmitry Baryshkov if (ret) 173aa613de6SDmitry Baryshkov break; 174aa613de6SDmitry Baryshkov } 175aa613de6SDmitry Baryshkov 176aa613de6SDmitry Baryshkov if (ret) 177aa613de6SDmitry Baryshkov mfd_remove_devices(parent); 178aa613de6SDmitry Baryshkov 179aa613de6SDmitry Baryshkov return ret; 180aa613de6SDmitry Baryshkov } 181aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_add_devices); 182aa613de6SDmitry Baryshkov 1831e29af62SAndres Salomon static int mfd_remove_devices_fn(struct device *dev, void *c) 184aa613de6SDmitry Baryshkov { 1851e29af62SAndres Salomon struct platform_device *pdev = to_platform_device(dev); 1861e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 1871e29af62SAndres Salomon atomic_t **usage_count = c; 1881e29af62SAndres Salomon 1891e29af62SAndres Salomon /* find the base address of usage_count pointers (for freeing) */ 1901e29af62SAndres Salomon if (!*usage_count || (cell->usage_count < *usage_count)) 1911e29af62SAndres Salomon *usage_count = cell->usage_count; 1921e29af62SAndres Salomon 1931e29af62SAndres Salomon platform_device_unregister(pdev); 194aa613de6SDmitry Baryshkov return 0; 195aa613de6SDmitry Baryshkov } 196aa613de6SDmitry Baryshkov 197424f525aSDmitry Baryshkov void mfd_remove_devices(struct device *parent) 198aa613de6SDmitry Baryshkov { 1991e29af62SAndres Salomon atomic_t *cnts = NULL; 2001e29af62SAndres Salomon 2011e29af62SAndres Salomon device_for_each_child(parent, &cnts, mfd_remove_devices_fn); 2021e29af62SAndres Salomon kfree(cnts); 203aa613de6SDmitry Baryshkov } 204aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_remove_devices); 205aa613de6SDmitry Baryshkov 206fa1df691SAndres Salomon int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) 207a9bbba99SAndres Salomon { 208a9bbba99SAndres Salomon struct mfd_cell cell_entry; 209a9bbba99SAndres Salomon struct device *dev; 210a9bbba99SAndres Salomon struct platform_device *pdev; 211fa1df691SAndres Salomon int i; 212a9bbba99SAndres Salomon 213a9bbba99SAndres Salomon /* fetch the parent cell's device (should already be registered!) */ 214a9bbba99SAndres Salomon dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); 215a9bbba99SAndres Salomon if (!dev) { 216a9bbba99SAndres Salomon printk(KERN_ERR "failed to find device for cell %s\n", cell); 217a9bbba99SAndres Salomon return -ENODEV; 218a9bbba99SAndres Salomon } 219a9bbba99SAndres Salomon pdev = to_platform_device(dev); 220a9bbba99SAndres Salomon memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); 221a9bbba99SAndres Salomon 222a9bbba99SAndres Salomon WARN_ON(!cell_entry.enable); 223a9bbba99SAndres Salomon 224fa1df691SAndres Salomon for (i = 0; i < n_clones; i++) { 225fa1df691SAndres Salomon cell_entry.name = clones[i]; 226fa1df691SAndres Salomon /* don't give up if a single call fails; just report error */ 227fa1df691SAndres Salomon if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0)) 228fa1df691SAndres Salomon dev_err(dev, "failed to create platform device '%s'\n", 229fa1df691SAndres Salomon clones[i]); 230a9bbba99SAndres Salomon } 231a9bbba99SAndres Salomon 232fa1df691SAndres Salomon return 0; 233a9bbba99SAndres Salomon } 234fa1df691SAndres Salomon EXPORT_SYMBOL(mfd_clone_cell); 235a9bbba99SAndres Salomon 236aa613de6SDmitry Baryshkov MODULE_LICENSE("GPL"); 237aa613de6SDmitry Baryshkov MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 238