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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/acpi.h>
17#include <linux/mfd/core.h>
18#include <linux/pm_runtime.h>
19#include <linux/slab.h>
20
21int mfd_cell_enable(struct platform_device *pdev)
22{
23 const struct mfd_cell *cell = mfd_get_cell(pdev);
24 int err = 0;
25
26 /* only call enable hook if the cell wasn't previously enabled */
27 if (atomic_inc_return(cell->usage_count) == 1)
28 err = cell->enable(pdev);
29
30 /* if the enable hook failed, decrement counter to allow retries */
31 if (err)
32 atomic_dec(cell->usage_count);
33
34 return err;
35}
36EXPORT_SYMBOL(mfd_cell_enable);
37
38int mfd_cell_disable(struct platform_device *pdev)
39{
40 const struct mfd_cell *cell = mfd_get_cell(pdev);
41 int err = 0;
42
43 /* only disable if no other clients are using it */
44 if (atomic_dec_return(cell->usage_count) == 0)
45 err = cell->disable(pdev);
46
47 /* if the disable hook failed, increment to allow retries */
48 if (err)
49 atomic_inc(cell->usage_count);
50
51 /* sanity check; did someone call disable too many times? */
52 WARN_ON(atomic_read(cell->usage_count) < 0);
53
54 return err;
55}
56EXPORT_SYMBOL(mfd_cell_disable);
57
58static int mfd_platform_add_cell(struct platform_device *pdev,
59 const struct mfd_cell *cell)
60{
61 if (!cell)
62 return 0;
63
64 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
65 if (!pdev->mfd_cell)
66 return -ENOMEM;
67
68 return 0;
69}
70
71static int mfd_add_device(struct device *parent, int id,
72 const struct mfd_cell *cell,
73 struct resource *mem_base,
74 int irq_base)
75{
76 struct resource *res;
77 struct platform_device *pdev;
78 int ret = -ENOMEM;
79 int r;
80
81 pdev = platform_device_alloc(cell->name, id + cell->id);
82 if (!pdev)
83 goto fail_alloc;
84
85 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
86 if (!res)
87 goto fail_device;
88
89 pdev->dev.parent = parent;
90
91 if (cell->pdata_size) {
92 ret = platform_device_add_data(pdev,
93 cell->platform_data, cell->pdata_size);
94 if (ret)
95 goto fail_res;
96 }
97
98 ret = mfd_platform_add_cell(pdev, cell);
99 if (ret)
100 goto fail_res;
101
102 for (r = 0; r < cell->num_resources; r++) {
103 res[r].name = cell->resources[r].name;
104 res[r].flags = cell->resources[r].flags;
105
106 /* Find out base to use */
107 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
108 res[r].parent = mem_base;
109 res[r].start = mem_base->start +
110 cell->resources[r].start;
111 res[r].end = mem_base->start +
112 cell->resources[r].end;
113 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
114 res[r].start = irq_base +
115 cell->resources[r].start;
116 res[r].end = irq_base +
117 cell->resources[r].end;
118 } else {
119 res[r].parent = cell->resources[r].parent;
120 res[r].start = cell->resources[r].start;
121 res[r].end = cell->resources[r].end;
122 }
123
124 if (!cell->ignore_resource_conflicts) {
125 ret = acpi_check_resource_conflict(res);
126 if (ret)
127 goto fail_res;
128 }
129 }
130
131 ret = platform_device_add_resources(pdev, res, cell->num_resources);
132 if (ret)
133 goto fail_res;
134
135 ret = platform_device_add(pdev);
136 if (ret)
137 goto fail_res;
138
139 if (cell->pm_runtime_no_callbacks)
140 pm_runtime_no_callbacks(&pdev->dev);
141
142 kfree(res);
143
144 return 0;
145
146fail_res:
147 kfree(res);
148fail_device:
149 platform_device_put(pdev);
150fail_alloc:
151 return ret;
152}
153
154int mfd_add_devices(struct device *parent, int id,
155 struct mfd_cell *cells, int n_devs,
156 struct resource *mem_base,
157 int irq_base)
158{
159 int i;
160 int ret = 0;
161 atomic_t *cnts;
162
163 /* initialize reference counting for all cells */
164 cnts = kcalloc(sizeof(*cnts), n_devs, GFP_KERNEL);
165 if (!cnts)
166 return -ENOMEM;
167
168 for (i = 0; i < n_devs; i++) {
169 atomic_set(&cnts[i], 0);
170 cells[i].usage_count = &cnts[i];
171 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
172 if (ret)
173 break;
174 }
175
176 if (ret)
177 mfd_remove_devices(parent);
178
179 return ret;
180}
181EXPORT_SYMBOL(mfd_add_devices);
182
183static int mfd_remove_devices_fn(struct device *dev, void *c)
184{
185 struct platform_device *pdev = to_platform_device(dev);
186 const struct mfd_cell *cell = mfd_get_cell(pdev);
187 atomic_t **usage_count = c;
188
189 /* find the base address of usage_count pointers (for freeing) */
190 if (!*usage_count || (cell->usage_count < *usage_count))
191 *usage_count = cell->usage_count;
192
193 platform_device_unregister(pdev);
194 return 0;
195}
196
197void mfd_remove_devices(struct device *parent)
198{
199 atomic_t *cnts = NULL;
200
201 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
202 kfree(cnts);
203}
204EXPORT_SYMBOL(mfd_remove_devices);
205
206int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
207{
208 struct mfd_cell cell_entry;
209 struct device *dev;
210 struct platform_device *pdev;
211 int i;
212
213 /* fetch the parent cell's device (should already be registered!) */
214 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
215 if (!dev) {
216 printk(KERN_ERR "failed to find device for cell %s\n", cell);
217 return -ENODEV;
218 }
219 pdev = to_platform_device(dev);
220 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
221
222 WARN_ON(!cell_entry.enable);
223
224 for (i = 0; i < n_clones; i++) {
225 cell_entry.name = clones[i];
226 /* don't give up if a single call fails; just report error */
227 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0))
228 dev_err(dev, "failed to create platform device '%s'\n",
229 clones[i]);
230 }
231
232 return 0;
233}
234EXPORT_SYMBOL(mfd_clone_cell);
235
236MODULE_LICENSE("GPL");
237MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
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/acpi.h>
17#include <linux/mfd/core.h>
18#include <linux/pm_runtime.h>
19#include <linux/slab.h>
20#include <linux/module.h>
21
22int mfd_cell_enable(struct platform_device *pdev)
23{
24 const struct mfd_cell *cell = mfd_get_cell(pdev);
25 int err = 0;
26
27 /* only call enable hook if the cell wasn't previously enabled */
28 if (atomic_inc_return(cell->usage_count) == 1)
29 err = cell->enable(pdev);
30
31 /* if the enable hook failed, decrement counter to allow retries */
32 if (err)
33 atomic_dec(cell->usage_count);
34
35 return err;
36}
37EXPORT_SYMBOL(mfd_cell_enable);
38
39int mfd_cell_disable(struct platform_device *pdev)
40{
41 const struct mfd_cell *cell = mfd_get_cell(pdev);
42 int err = 0;
43
44 /* only disable if no other clients are using it */
45 if (atomic_dec_return(cell->usage_count) == 0)
46 err = cell->disable(pdev);
47
48 /* if the disable hook failed, increment to allow retries */
49 if (err)
50 atomic_inc(cell->usage_count);
51
52 /* sanity check; did someone call disable too many times? */
53 WARN_ON(atomic_read(cell->usage_count) < 0);
54
55 return err;
56}
57EXPORT_SYMBOL(mfd_cell_disable);
58
59static int mfd_platform_add_cell(struct platform_device *pdev,
60 const struct mfd_cell *cell)
61{
62 if (!cell)
63 return 0;
64
65 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
66 if (!pdev->mfd_cell)
67 return -ENOMEM;
68
69 return 0;
70}
71
72static int mfd_add_device(struct device *parent, int id,
73 const struct mfd_cell *cell,
74 struct resource *mem_base,
75 int irq_base)
76{
77 struct resource *res;
78 struct platform_device *pdev;
79 int ret = -ENOMEM;
80 int r;
81
82 pdev = platform_device_alloc(cell->name, id + cell->id);
83 if (!pdev)
84 goto fail_alloc;
85
86 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
87 if (!res)
88 goto fail_device;
89
90 pdev->dev.parent = parent;
91
92 if (cell->pdata_size) {
93 ret = platform_device_add_data(pdev,
94 cell->platform_data, cell->pdata_size);
95 if (ret)
96 goto fail_res;
97 }
98
99 ret = mfd_platform_add_cell(pdev, cell);
100 if (ret)
101 goto fail_res;
102
103 for (r = 0; r < cell->num_resources; r++) {
104 res[r].name = cell->resources[r].name;
105 res[r].flags = cell->resources[r].flags;
106
107 /* Find out base to use */
108 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
109 res[r].parent = mem_base;
110 res[r].start = mem_base->start +
111 cell->resources[r].start;
112 res[r].end = mem_base->start +
113 cell->resources[r].end;
114 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
115 res[r].start = irq_base +
116 cell->resources[r].start;
117 res[r].end = irq_base +
118 cell->resources[r].end;
119 } else {
120 res[r].parent = cell->resources[r].parent;
121 res[r].start = cell->resources[r].start;
122 res[r].end = cell->resources[r].end;
123 }
124
125 if (!cell->ignore_resource_conflicts) {
126 ret = acpi_check_resource_conflict(&res[r]);
127 if (ret)
128 goto fail_res;
129 }
130 }
131
132 ret = platform_device_add_resources(pdev, res, cell->num_resources);
133 if (ret)
134 goto fail_res;
135
136 ret = platform_device_add(pdev);
137 if (ret)
138 goto fail_res;
139
140 if (cell->pm_runtime_no_callbacks)
141 pm_runtime_no_callbacks(&pdev->dev);
142
143 kfree(res);
144
145 return 0;
146
147fail_res:
148 kfree(res);
149fail_device:
150 platform_device_put(pdev);
151fail_alloc:
152 return ret;
153}
154
155int mfd_add_devices(struct device *parent, int id,
156 struct mfd_cell *cells, int n_devs,
157 struct resource *mem_base,
158 int irq_base)
159{
160 int i;
161 int ret = 0;
162 atomic_t *cnts;
163
164 /* initialize reference counting for all cells */
165 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
166 if (!cnts)
167 return -ENOMEM;
168
169 for (i = 0; i < n_devs; i++) {
170 atomic_set(&cnts[i], 0);
171 cells[i].usage_count = &cnts[i];
172 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
173 if (ret)
174 break;
175 }
176
177 if (ret)
178 mfd_remove_devices(parent);
179
180 return ret;
181}
182EXPORT_SYMBOL(mfd_add_devices);
183
184static int mfd_remove_devices_fn(struct device *dev, void *c)
185{
186 struct platform_device *pdev = to_platform_device(dev);
187 const struct mfd_cell *cell = mfd_get_cell(pdev);
188 atomic_t **usage_count = c;
189
190 /* find the base address of usage_count pointers (for freeing) */
191 if (!*usage_count || (cell->usage_count < *usage_count))
192 *usage_count = cell->usage_count;
193
194 platform_device_unregister(pdev);
195 return 0;
196}
197
198void mfd_remove_devices(struct device *parent)
199{
200 atomic_t *cnts = NULL;
201
202 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
203 kfree(cnts);
204}
205EXPORT_SYMBOL(mfd_remove_devices);
206
207int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
208{
209 struct mfd_cell cell_entry;
210 struct device *dev;
211 struct platform_device *pdev;
212 int i;
213
214 /* fetch the parent cell's device (should already be registered!) */
215 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
216 if (!dev) {
217 printk(KERN_ERR "failed to find device for cell %s\n", cell);
218 return -ENODEV;
219 }
220 pdev = to_platform_device(dev);
221 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
222
223 WARN_ON(!cell_entry.enable);
224
225 for (i = 0; i < n_clones; i++) {
226 cell_entry.name = clones[i];
227 /* don't give up if a single call fails; just report error */
228 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0))
229 dev_err(dev, "failed to create platform device '%s'\n",
230 clones[i]);
231 }
232
233 return 0;
234}
235EXPORT_SYMBOL(mfd_clone_cell);
236
237MODULE_LICENSE("GPL");
238MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");