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Commit | Line | Data |
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aa613de6 DES |
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> | |
91fedede | 16 | #include <linux/acpi.h> |
aa613de6 | 17 | #include <linux/mfd/core.h> |
4c90aa94 | 18 | #include <linux/pm_runtime.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
aa613de6 | 20 | |
f77289ac | 21 | int mfd_cell_enable(struct platform_device *pdev) |
1e29af62 AS |
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 | } | |
f77289ac | 36 | EXPORT_SYMBOL(mfd_cell_enable); |
1e29af62 | 37 | |
f77289ac | 38 | int mfd_cell_disable(struct platform_device *pdev) |
1e29af62 AS |
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 | } | |
f77289ac | 56 | EXPORT_SYMBOL(mfd_cell_disable); |
1e29af62 | 57 | |
e710d7d5 SO |
58 | static 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 | ||
424f525a | 71 | static int mfd_add_device(struct device *parent, int id, |
7f71ac93 BD |
72 | const struct mfd_cell *cell, |
73 | struct resource *mem_base, | |
74 | int irq_base) | |
aa613de6 | 75 | { |
a87903f3 | 76 | struct resource *res; |
aa613de6 DES |
77 | struct platform_device *pdev; |
78 | int ret = -ENOMEM; | |
79 | int r; | |
80 | ||
3bed6e41 | 81 | pdev = platform_device_alloc(cell->name, id + cell->id); |
aa613de6 DES |
82 | if (!pdev) |
83 | goto fail_alloc; | |
84 | ||
a87903f3 IM |
85 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
86 | if (!res) | |
87 | goto fail_device; | |
88 | ||
424f525a | 89 | pdev->dev.parent = parent; |
aa613de6 | 90 | |
eb895607 SO |
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 | ||
e710d7d5 | 98 | ret = mfd_platform_add_cell(pdev, cell); |
fe891a00 AS |
99 | if (ret) |
100 | goto fail_res; | |
aa613de6 | 101 | |
aa613de6 DES |
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 */ | |
f03cfcbc | 107 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DES |
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 | } | |
91fedede | 123 | |
5f2545fa DD |
124 | if (!cell->ignore_resource_conflicts) { |
125 | ret = acpi_check_resource_conflict(res); | |
126 | if (ret) | |
127 | goto fail_res; | |
128 | } | |
aa613de6 DES |
129 | } |
130 | ||
8af5fe3b AL |
131 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
132 | if (ret) | |
133 | goto fail_res; | |
aa613de6 DES |
134 | |
135 | ret = platform_device_add(pdev); | |
136 | if (ret) | |
a87903f3 IM |
137 | goto fail_res; |
138 | ||
4c90aa94 MB |
139 | if (cell->pm_runtime_no_callbacks) |
140 | pm_runtime_no_callbacks(&pdev->dev); | |
141 | ||
a87903f3 | 142 | kfree(res); |
aa613de6 DES |
143 | |
144 | return 0; | |
145 | ||
a87903f3 IM |
146 | fail_res: |
147 | kfree(res); | |
aa613de6 DES |
148 | fail_device: |
149 | platform_device_put(pdev); | |
150 | fail_alloc: | |
151 | return ret; | |
152 | } | |
153 | ||
424f525a | 154 | int mfd_add_devices(struct device *parent, int id, |
1e29af62 | 155 | struct mfd_cell *cells, int n_devs, |
7f71ac93 BD |
156 | struct resource *mem_base, |
157 | int irq_base) | |
aa613de6 DES |
158 | { |
159 | int i; | |
160 | int ret = 0; | |
1e29af62 AS |
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; | |
aa613de6 DES |
167 | |
168 | for (i = 0; i < n_devs; i++) { | |
1e29af62 AS |
169 | atomic_set(&cnts[i], 0); |
170 | cells[i].usage_count = &cnts[i]; | |
424f525a | 171 | ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); |
aa613de6 DES |
172 | if (ret) |
173 | break; | |
174 | } | |
175 | ||
176 | if (ret) | |
177 | mfd_remove_devices(parent); | |
178 | ||
179 | return ret; | |
180 | } | |
181 | EXPORT_SYMBOL(mfd_add_devices); | |
182 | ||
1e29af62 | 183 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 184 | { |
1e29af62 AS |
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); | |
aa613de6 DES |
194 | return 0; |
195 | } | |
196 | ||
424f525a | 197 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 198 | { |
1e29af62 AS |
199 | atomic_t *cnts = NULL; |
200 | ||
201 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); | |
202 | kfree(cnts); | |
aa613de6 DES |
203 | } |
204 | EXPORT_SYMBOL(mfd_remove_devices); | |
205 | ||
fa1df691 | 206 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
a9bbba99 AS |
207 | { |
208 | struct mfd_cell cell_entry; | |
209 | struct device *dev; | |
210 | struct platform_device *pdev; | |
fa1df691 | 211 | int i; |
a9bbba99 AS |
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 | ||
fa1df691 AS |
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 | } | |
a9bbba99 | 231 | |
fa1df691 | 232 | return 0; |
a9bbba99 | 233 | } |
fa1df691 | 234 | EXPORT_SYMBOL(mfd_clone_cell); |
a9bbba99 | 235 | |
aa613de6 DES |
236 | MODULE_LICENSE("GPL"); |
237 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |