Commit | Line | Data |
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aa613de6 DB |
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 | |
424f525a | 58 | static int mfd_add_device(struct device *parent, int id, |
7f71ac93 BD |
59 | const struct mfd_cell *cell, |
60 | struct resource *mem_base, | |
61 | int irq_base) | |
aa613de6 | 62 | { |
a87903f3 | 63 | struct resource *res; |
aa613de6 DB |
64 | struct platform_device *pdev; |
65 | int ret = -ENOMEM; | |
66 | int r; | |
67 | ||
3bed6e41 | 68 | pdev = platform_device_alloc(cell->name, id + cell->id); |
aa613de6 DB |
69 | if (!pdev) |
70 | goto fail_alloc; | |
71 | ||
a87903f3 IM |
72 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
73 | if (!res) | |
74 | goto fail_device; | |
75 | ||
424f525a | 76 | pdev->dev.parent = parent; |
aa613de6 | 77 | |
fe891a00 AS |
78 | ret = platform_device_add_data(pdev, cell, sizeof(*cell)); |
79 | if (ret) | |
80 | goto fail_res; | |
aa613de6 | 81 | |
aa613de6 DB |
82 | for (r = 0; r < cell->num_resources; r++) { |
83 | res[r].name = cell->resources[r].name; | |
84 | res[r].flags = cell->resources[r].flags; | |
85 | ||
86 | /* Find out base to use */ | |
f03cfcbc | 87 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DB |
88 | res[r].parent = mem_base; |
89 | res[r].start = mem_base->start + | |
90 | cell->resources[r].start; | |
91 | res[r].end = mem_base->start + | |
92 | cell->resources[r].end; | |
93 | } else if (cell->resources[r].flags & IORESOURCE_IRQ) { | |
94 | res[r].start = irq_base + | |
95 | cell->resources[r].start; | |
96 | res[r].end = irq_base + | |
97 | cell->resources[r].end; | |
98 | } else { | |
99 | res[r].parent = cell->resources[r].parent; | |
100 | res[r].start = cell->resources[r].start; | |
101 | res[r].end = cell->resources[r].end; | |
102 | } | |
91fedede | 103 | |
5f2545fa DD |
104 | if (!cell->ignore_resource_conflicts) { |
105 | ret = acpi_check_resource_conflict(res); | |
106 | if (ret) | |
107 | goto fail_res; | |
108 | } | |
aa613de6 DB |
109 | } |
110 | ||
8af5fe3b AL |
111 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
112 | if (ret) | |
113 | goto fail_res; | |
aa613de6 DB |
114 | |
115 | ret = platform_device_add(pdev); | |
116 | if (ret) | |
a87903f3 IM |
117 | goto fail_res; |
118 | ||
4c90aa94 MB |
119 | if (cell->pm_runtime_no_callbacks) |
120 | pm_runtime_no_callbacks(&pdev->dev); | |
121 | ||
a87903f3 | 122 | kfree(res); |
aa613de6 DB |
123 | |
124 | return 0; | |
125 | ||
126 | /* platform_device_del(pdev); */ | |
a87903f3 IM |
127 | fail_res: |
128 | kfree(res); | |
aa613de6 DB |
129 | fail_device: |
130 | platform_device_put(pdev); | |
131 | fail_alloc: | |
132 | return ret; | |
133 | } | |
134 | ||
424f525a | 135 | int mfd_add_devices(struct device *parent, int id, |
1e29af62 | 136 | struct mfd_cell *cells, int n_devs, |
7f71ac93 BD |
137 | struct resource *mem_base, |
138 | int irq_base) | |
aa613de6 DB |
139 | { |
140 | int i; | |
141 | int ret = 0; | |
1e29af62 AS |
142 | atomic_t *cnts; |
143 | ||
144 | /* initialize reference counting for all cells */ | |
145 | cnts = kcalloc(sizeof(*cnts), n_devs, GFP_KERNEL); | |
146 | if (!cnts) | |
147 | return -ENOMEM; | |
aa613de6 DB |
148 | |
149 | for (i = 0; i < n_devs; i++) { | |
1e29af62 AS |
150 | atomic_set(&cnts[i], 0); |
151 | cells[i].usage_count = &cnts[i]; | |
424f525a | 152 | ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); |
aa613de6 DB |
153 | if (ret) |
154 | break; | |
155 | } | |
156 | ||
157 | if (ret) | |
158 | mfd_remove_devices(parent); | |
159 | ||
160 | return ret; | |
161 | } | |
162 | EXPORT_SYMBOL(mfd_add_devices); | |
163 | ||
1e29af62 | 164 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 165 | { |
1e29af62 AS |
166 | struct platform_device *pdev = to_platform_device(dev); |
167 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
168 | atomic_t **usage_count = c; | |
169 | ||
170 | /* find the base address of usage_count pointers (for freeing) */ | |
171 | if (!*usage_count || (cell->usage_count < *usage_count)) | |
172 | *usage_count = cell->usage_count; | |
173 | ||
174 | platform_device_unregister(pdev); | |
aa613de6 DB |
175 | return 0; |
176 | } | |
177 | ||
424f525a | 178 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 179 | { |
1e29af62 AS |
180 | atomic_t *cnts = NULL; |
181 | ||
182 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); | |
183 | kfree(cnts); | |
aa613de6 DB |
184 | } |
185 | EXPORT_SYMBOL(mfd_remove_devices); | |
186 | ||
a9bbba99 AS |
187 | static int add_shared_platform_device(const char *cell, const char *name) |
188 | { | |
189 | struct mfd_cell cell_entry; | |
190 | struct device *dev; | |
191 | struct platform_device *pdev; | |
192 | int err; | |
193 | ||
194 | /* check if we've already registered a device (don't fail if we have) */ | |
195 | if (bus_find_device_by_name(&platform_bus_type, NULL, name)) | |
196 | return 0; | |
197 | ||
198 | /* fetch the parent cell's device (should already be registered!) */ | |
199 | dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); | |
200 | if (!dev) { | |
201 | printk(KERN_ERR "failed to find device for cell %s\n", cell); | |
202 | return -ENODEV; | |
203 | } | |
204 | pdev = to_platform_device(dev); | |
205 | memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); | |
206 | ||
207 | WARN_ON(!cell_entry.enable); | |
208 | ||
209 | cell_entry.name = name; | |
210 | err = mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0); | |
211 | if (err) | |
212 | dev_err(dev, "MFD add devices failed: %d\n", err); | |
213 | return err; | |
214 | } | |
215 | ||
216 | int mfd_shared_platform_driver_register(struct platform_driver *drv, | |
217 | const char *cellname) | |
218 | { | |
219 | int err; | |
220 | ||
221 | err = add_shared_platform_device(cellname, drv->driver.name); | |
222 | if (err) | |
223 | printk(KERN_ERR "failed to add platform device %s\n", | |
224 | drv->driver.name); | |
225 | ||
226 | err = platform_driver_register(drv); | |
227 | if (err) | |
228 | printk(KERN_ERR "failed to add platform driver %s\n", | |
229 | drv->driver.name); | |
230 | ||
231 | return err; | |
232 | } | |
233 | EXPORT_SYMBOL(mfd_shared_platform_driver_register); | |
234 | ||
235 | void mfd_shared_platform_driver_unregister(struct platform_driver *drv) | |
236 | { | |
237 | struct device *dev; | |
238 | ||
239 | dev = bus_find_device_by_name(&platform_bus_type, NULL, | |
240 | drv->driver.name); | |
241 | if (dev) | |
242 | platform_device_unregister(to_platform_device(dev)); | |
243 | ||
244 | platform_driver_unregister(drv); | |
245 | } | |
246 | EXPORT_SYMBOL(mfd_shared_platform_driver_unregister); | |
247 | ||
aa613de6 DB |
248 | MODULE_LICENSE("GPL"); |
249 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |