diff options
| -rw-r--r-- | drivers/mfd/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/mfd/Makefile | 2 | ||||
| -rw-r--r-- | drivers/mfd/mfd-core.c | 114 | ||||
| -rw-r--r-- | include/linux/mfd/core.h | 55 |
4 files changed, 175 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 1a1ac262fc8..8ebc0be1095 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -5,6 +5,10 @@ menu "Multifunction device drivers" depends on HAS_IOMEM +config MFD_CORE + tristate + default n + config MFD_SM501 tristate "Support for Silicon Motion SM501" ---help--- diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index b4168442d53..33daa2f45dd 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -10,6 +10,8 @@ obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o +obj-$(CONFIG_MFD_CORE) += mfd-core.o + obj-$(CONFIG_MCP) += mcp-core.o obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c new file mode 100644 index 00000000000..d7d88ce053a --- /dev/null +++ b/drivers/mfd/mfd-core.c @@ -0,0 +1,114 @@ +/* + * drivers/mfd/mfd-core.c + * + * core MFD support + * Copyright (c) 2006 Ian Molton + * Copyright (c) 2007,2008 Dmitry Baryshkov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/mfd/core.h> + +static int mfd_add_device(struct platform_device *parent, + const struct mfd_cell *cell, + struct resource *mem_base, + int irq_base) +{ + struct resource res[cell->num_resources]; + struct platform_device *pdev; + int ret = -ENOMEM; + int r; + + pdev = platform_device_alloc(cell->name, parent->id); + if (!pdev) + goto fail_alloc; + + pdev->dev.parent = &parent->dev; + + ret = platform_device_add_data(pdev, + cell, sizeof(struct mfd_cell)); + if (ret) + goto fail_device; + + memzero(res, sizeof(res)); + for (r = 0; r < cell->num_resources; r++) { + res[r].name = cell->resources[r].name; + res[r].flags = cell->resources[r].flags; + + /* Find out base to use */ + if (cell->resources[r].flags & IORESOURCE_MEM) { + res[r].parent = mem_base; + res[r].start = mem_base->start + + cell->resources[r].start; + res[r].end = mem_base->start + + cell->resources[r].end; + } else if (cell->resources[r].flags & IORESOURCE_IRQ) { + res[r].start = irq_base + + cell->resources[r].start; + res[r].end = irq_base + + cell->resources[r].end; + } else { + res[r].parent = cell->resources[r].parent; + res[r].start = cell->resources[r].start; + res[r].end = cell->resources[r].end; + } + } + + platform_device_add_resources(pdev, res, cell->num_resources); + + ret = platform_device_add(pdev); + if (ret) + goto fail_device; + + return 0; + +/* platform_device_del(pdev); */ +fail_device: + platform_device_put(pdev); +fail_alloc: + return ret; +} + +int mfd_add_devices( + struct platform_device *parent, + const struct mfd_cell *cells, int n_devs, + struct resource *mem_base, + int irq_base) +{ + int i; + int ret = 0; + + for (i = 0; i < n_devs; i++) { + ret = mfd_add_device(parent, cells + i, mem_base, irq_base); + if (ret) + break; + } + + if (ret) + mfd_remove_devices(parent); + + return ret; +} +EXPORT_SYMBOL(mfd_add_devices); + +static int mfd_remove_devices_fn(struct device *dev, void *unused) +{ + platform_device_unregister( + container_of(dev, struct platform_device, dev)); + return 0; +} + +void mfd_remove_devices(struct platform_device *parent) +{ + device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn); +} +EXPORT_SYMBOL(mfd_remove_devices); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h new file mode 100644 index 00000000000..bb3dd054592 --- /dev/null +++ b/include/linux/mfd/core.h @@ -0,0 +1,55 @@ +#ifndef MFD_CORE_H +#define MFD_CORE_H +/* + * drivers/mfd/mfd-core.h + * + * core MFD support + * Copyright (c) 2006 Ian Molton + * Copyright (c) 2007 Dmitry Baryshkov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/platform_device.h> + +/* + * This struct describes the MFD part ("cell"). + * After registration the copy of this structure will become the platform data + * of the resulting platform_device + */ +struct mfd_cell { + const char *name; + + int (*enable)(struct platform_device *dev); + int (*disable)(struct platform_device *dev); + int (*suspend)(struct platform_device *dev); + int (*resume)(struct platform_device *dev); + + void *driver_data; /* driver-specific data */ + + /* + * This resources can be specified relatievly to the parent device. + * For accessing device you should use resources from device + */ + int num_resources; + const struct resource *resources; +}; + +static inline struct mfd_cell * +mfd_get_cell(struct platform_device *pdev) +{ + return (struct mfd_cell *)pdev->dev.platform_data; +} + +extern int mfd_add_devices( + struct platform_device *parent, + const struct mfd_cell *cells, int n_devs, + struct resource *mem_base, + int irq_base); + +extern void mfd_remove_devices(struct platform_device *parent); + +#endif |