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-rw-r--r--drivers/mfd/Kconfig4
-rw-r--r--drivers/mfd/Makefile2
-rw-r--r--drivers/mfd/mfd-core.c114
-rw-r--r--include/linux/mfd/core.h55
4 files changed, 175 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1a1ac262fc87..8ebc0be10953 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -5,6 +5,10 @@
5menu "Multifunction device drivers" 5menu "Multifunction device drivers"
6 depends on HAS_IOMEM 6 depends on HAS_IOMEM
7 7
8config MFD_CORE
9 tristate
10 default n
11
8config MFD_SM501 12config MFD_SM501
9 tristate "Support for Silicon Motion SM501" 13 tristate "Support for Silicon Motion SM501"
10 ---help--- 14 ---help---
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b4168442d53c..33daa2f45dd8 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -10,6 +10,8 @@ obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
10 10
11obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o 11obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o
12 12
13obj-$(CONFIG_MFD_CORE) += mfd-core.o
14
13obj-$(CONFIG_MCP) += mcp-core.o 15obj-$(CONFIG_MCP) += mcp-core.o
14obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o 16obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o
15obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o 17obj-$(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 000000000000..d7d88ce053a6
--- /dev/null
+++ b/drivers/mfd/mfd-core.c
@@ -0,0 +1,114 @@
1/*
2 * drivers/mfd/mfd-core.c
3 *
4 * core MFD support
5 * Copyright (c) 2006 Ian Molton
6 * Copyright (c) 2007,2008 Dmitry Baryshkov
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/platform_device.h>
16#include <linux/mfd/core.h>
17
18static int mfd_add_device(struct platform_device *parent,
19 const struct mfd_cell *cell,
20 struct resource *mem_base,
21 int irq_base)
22{
23 struct resource res[cell->num_resources];
24 struct platform_device *pdev;
25 int ret = -ENOMEM;
26 int r;
27
28 pdev = platform_device_alloc(cell->name, parent->id);
29 if (!pdev)
30 goto fail_alloc;
31
32 pdev->dev.parent = &parent->dev;
33
34 ret = platform_device_add_data(pdev,
35 cell, sizeof(struct mfd_cell));
36 if (ret)
37 goto fail_device;
38
39 memzero(res, sizeof(res));
40 for (r = 0; r < cell->num_resources; r++) {
41 res[r].name = cell->resources[r].name;
42 res[r].flags = cell->resources[r].flags;
43
44 /* Find out base to use */
45 if (cell->resources[r].flags & IORESOURCE_MEM) {
46 res[r].parent = mem_base;
47 res[r].start = mem_base->start +
48 cell->resources[r].start;
49 res[r].end = mem_base->start +
50 cell->resources[r].end;
51 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
52 res[r].start = irq_base +
53 cell->resources[r].start;
54 res[r].end = irq_base +
55 cell->resources[r].end;
56 } else {
57 res[r].parent = cell->resources[r].parent;
58 res[r].start = cell->resources[r].start;
59 res[r].end = cell->resources[r].end;
60 }
61 }
62
63 platform_device_add_resources(pdev, res, cell->num_resources);
64
65 ret = platform_device_add(pdev);
66 if (ret)
67 goto fail_device;
68
69 return 0;
70
71/* platform_device_del(pdev); */
72fail_device:
73 platform_device_put(pdev);
74fail_alloc:
75 return ret;
76}
77
78int mfd_add_devices(
79 struct platform_device *parent,
80 const struct mfd_cell *cells, int n_devs,
81 struct resource *mem_base,
82 int irq_base)
83{
84 int i;
85 int ret = 0;
86
87 for (i = 0; i < n_devs; i++) {
88 ret = mfd_add_device(parent, cells + i, mem_base, irq_base);
89 if (ret)
90 break;
91 }
92
93 if (ret)
94 mfd_remove_devices(parent);
95
96 return ret;
97}
98EXPORT_SYMBOL(mfd_add_devices);
99
100static int mfd_remove_devices_fn(struct device *dev, void *unused)
101{
102 platform_device_unregister(
103 container_of(dev, struct platform_device, dev));
104 return 0;
105}
106
107void mfd_remove_devices(struct platform_device *parent)
108{
109 device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn);
110}
111EXPORT_SYMBOL(mfd_remove_devices);
112
113MODULE_LICENSE("GPL");
114MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
new file mode 100644
index 000000000000..bb3dd0545928
--- /dev/null
+++ b/include/linux/mfd/core.h
@@ -0,0 +1,55 @@
1#ifndef MFD_CORE_H
2#define MFD_CORE_H
3/*
4 * drivers/mfd/mfd-core.h
5 *
6 * core MFD support
7 * Copyright (c) 2006 Ian Molton
8 * Copyright (c) 2007 Dmitry Baryshkov
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15
16#include <linux/platform_device.h>
17
18/*
19 * This struct describes the MFD part ("cell").
20 * After registration the copy of this structure will become the platform data
21 * of the resulting platform_device
22 */
23struct mfd_cell {
24 const char *name;
25
26 int (*enable)(struct platform_device *dev);
27 int (*disable)(struct platform_device *dev);
28 int (*suspend)(struct platform_device *dev);
29 int (*resume)(struct platform_device *dev);
30
31 void *driver_data; /* driver-specific data */
32
33 /*
34 * This resources can be specified relatievly to the parent device.
35 * For accessing device you should use resources from device
36 */
37 int num_resources;
38 const struct resource *resources;
39};
40
41static inline struct mfd_cell *
42mfd_get_cell(struct platform_device *pdev)
43{
44 return (struct mfd_cell *)pdev->dev.platform_data;
45}
46
47extern int mfd_add_devices(
48 struct platform_device *parent,
49 const struct mfd_cell *cells, int n_devs,
50 struct resource *mem_base,
51 int irq_base);
52
53extern void mfd_remove_devices(struct platform_device *parent);
54
55#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 05:16:42 -0500