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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#include <linux/irqdomain.h>
22#include <linux/of.h>
23#include <linux/regulator/consumer.h>
24
25static struct device_type mfd_dev_type = {
26 .name = "mfd_device",
27};
28
29int mfd_cell_enable(struct platform_device *pdev)
30{
31 const struct mfd_cell *cell = mfd_get_cell(pdev);
32 int err = 0;
33
34 /* only call enable hook if the cell wasn't previously enabled */
35 if (atomic_inc_return(cell->usage_count) == 1)
36 err = cell->enable(pdev);
37
38 /* if the enable hook failed, decrement counter to allow retries */
39 if (err)
40 atomic_dec(cell->usage_count);
41
42 return err;
43}
44EXPORT_SYMBOL(mfd_cell_enable);
45
46int mfd_cell_disable(struct platform_device *pdev)
47{
48 const struct mfd_cell *cell = mfd_get_cell(pdev);
49 int err = 0;
50
51 /* only disable if no other clients are using it */
52 if (atomic_dec_return(cell->usage_count) == 0)
53 err = cell->disable(pdev);
54
55 /* if the disable hook failed, increment to allow retries */
56 if (err)
57 atomic_inc(cell->usage_count);
58
59 /* sanity check; did someone call disable too many times? */
60 WARN_ON(atomic_read(cell->usage_count) < 0);
61
62 return err;
63}
64EXPORT_SYMBOL(mfd_cell_disable);
65
66static int mfd_platform_add_cell(struct platform_device *pdev,
67 const struct mfd_cell *cell,
68 atomic_t *usage_count)
69{
70 if (!cell)
71 return 0;
72
73 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
74 if (!pdev->mfd_cell)
75 return -ENOMEM;
76
77 pdev->mfd_cell->usage_count = usage_count;
78 return 0;
79}
80
81static int mfd_add_device(struct device *parent, int id,
82 const struct mfd_cell *cell, atomic_t *usage_count,
83 struct resource *mem_base,
84 int irq_base, struct irq_domain *domain)
85{
86 struct resource *res;
87 struct platform_device *pdev;
88 struct device_node *np = NULL;
89 int ret = -ENOMEM;
90 int r;
91
92 pdev = platform_device_alloc(cell->name, id + cell->id);
93 if (!pdev)
94 goto fail_alloc;
95
96 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
97 if (!res)
98 goto fail_device;
99
100 pdev->dev.parent = parent;
101 pdev->dev.type = &mfd_dev_type;
102 pdev->dev.dma_mask = parent->dma_mask;
103 pdev->dev.dma_parms = parent->dma_parms;
104
105 ret = devm_regulator_bulk_register_supply_alias(
106 &pdev->dev, cell->parent_supplies,
107 parent, cell->parent_supplies,
108 cell->num_parent_supplies);
109 if (ret < 0)
110 goto fail_res;
111
112 if (parent->of_node && cell->of_compatible) {
113 for_each_child_of_node(parent->of_node, np) {
114 if (of_device_is_compatible(np, cell->of_compatible)) {
115 pdev->dev.of_node = np;
116 break;
117 }
118 }
119 }
120
121 if (cell->pdata_size) {
122 ret = platform_device_add_data(pdev,
123 cell->platform_data, cell->pdata_size);
124 if (ret)
125 goto fail_alias;
126 }
127
128 ret = mfd_platform_add_cell(pdev, cell, usage_count);
129 if (ret)
130 goto fail_alias;
131
132 for (r = 0; r < cell->num_resources; r++) {
133 res[r].name = cell->resources[r].name;
134 res[r].flags = cell->resources[r].flags;
135
136 /* Find out base to use */
137 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
138 res[r].parent = mem_base;
139 res[r].start = mem_base->start +
140 cell->resources[r].start;
141 res[r].end = mem_base->start +
142 cell->resources[r].end;
143 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
144 if (domain) {
145 /* Unable to create mappings for IRQ ranges. */
146 WARN_ON(cell->resources[r].start !=
147 cell->resources[r].end);
148 res[r].start = res[r].end = irq_create_mapping(
149 domain, cell->resources[r].start);
150 } else {
151 res[r].start = irq_base +
152 cell->resources[r].start;
153 res[r].end = irq_base +
154 cell->resources[r].end;
155 }
156 } else {
157 res[r].parent = cell->resources[r].parent;
158 res[r].start = cell->resources[r].start;
159 res[r].end = cell->resources[r].end;
160 }
161
162 if (!cell->ignore_resource_conflicts) {
163 ret = acpi_check_resource_conflict(&res[r]);
164 if (ret)
165 goto fail_alias;
166 }
167 }
168
169 ret = platform_device_add_resources(pdev, res, cell->num_resources);
170 if (ret)
171 goto fail_alias;
172
173 ret = platform_device_add(pdev);
174 if (ret)
175 goto fail_alias;
176
177 if (cell->pm_runtime_no_callbacks)
178 pm_runtime_no_callbacks(&pdev->dev);
179
180 kfree(res);
181
182 return 0;
183
184fail_alias:
185 devm_regulator_bulk_unregister_supply_alias(&pdev->dev,
186 cell->parent_supplies,
187 cell->num_parent_supplies);
188fail_res:
189 kfree(res);
190fail_device:
191 platform_device_put(pdev);
192fail_alloc:
193 return ret;
194}
195
196int mfd_add_devices(struct device *parent, int id,
197 const struct mfd_cell *cells, int n_devs,
198 struct resource *mem_base,
199 int irq_base, struct irq_domain *domain)
200{
201 int i;
202 int ret;
203 atomic_t *cnts;
204
205 /* initialize reference counting for all cells */
206 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
207 if (!cnts)
208 return -ENOMEM;
209
210 for (i = 0; i < n_devs; i++) {
211 atomic_set(&cnts[i], 0);
212 ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
213 irq_base, domain);
214 if (ret)
215 goto fail;
216 }
217
218 return 0;
219
220fail:
221 if (i)
222 mfd_remove_devices(parent);
223 else
224 kfree(cnts);
225 return ret;
226}
227EXPORT_SYMBOL(mfd_add_devices);
228
229static int mfd_remove_devices_fn(struct device *dev, void *c)
230{
231 struct platform_device *pdev;
232 const struct mfd_cell *cell;
233 atomic_t **usage_count = c;
234
235 if (dev->type != &mfd_dev_type)
236 return 0;
237
238 pdev = to_platform_device(dev);
239 cell = mfd_get_cell(pdev);
240
241 /* find the base address of usage_count pointers (for freeing) */
242 if (!*usage_count || (cell->usage_count < *usage_count))
243 *usage_count = cell->usage_count;
244
245 platform_device_unregister(pdev);
246 return 0;
247}
248
249void mfd_remove_devices(struct device *parent)
250{
251 atomic_t *cnts = NULL;
252
253 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
254 kfree(cnts);
255}
256EXPORT_SYMBOL(mfd_remove_devices);
257
258int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
259{
260 struct mfd_cell cell_entry;
261 struct device *dev;
262 struct platform_device *pdev;
263 int i;
264
265 /* fetch the parent cell's device (should already be registered!) */
266 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
267 if (!dev) {
268 printk(KERN_ERR "failed to find device for cell %s\n", cell);
269 return -ENODEV;
270 }
271 pdev = to_platform_device(dev);
272 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
273
274 WARN_ON(!cell_entry.enable);
275
276 for (i = 0; i < n_clones; i++) {
277 cell_entry.name = clones[i];
278 /* don't give up if a single call fails; just report error */
279 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
280 cell_entry.usage_count, NULL, 0, NULL))
281 dev_err(dev, "failed to create platform device '%s'\n",
282 clones[i]);
283 }
284
285 return 0;
286}
287EXPORT_SYMBOL(mfd_clone_cell);
288
289MODULE_LICENSE("GPL");
290MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");