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