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Dmitry Baryshkovaa613de2008-06-27 10:37:19 +01001/*
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>
Samuel Ortiz91feded2010-02-19 11:07:59 +010016#include <linux/acpi.h>
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010017#include <linux/mfd/core.h>
Mark Brown4c90aa92010-11-26 17:19:34 +000018#include <linux/pm_runtime.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Paul Gortmaker4e36dd32011-07-03 15:13:27 -040020#include <linux/module.h>
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010021
Andres Salomonf77289a2011-03-03 09:51:58 -080022int mfd_cell_enable(struct platform_device *pdev)
Andres Salomon1e29af62011-02-17 19:07:34 -080023{
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}
Andres Salomonf77289a2011-03-03 09:51:58 -080037EXPORT_SYMBOL(mfd_cell_enable);
Andres Salomon1e29af62011-02-17 19:07:34 -080038
Andres Salomonf77289a2011-03-03 09:51:58 -080039int mfd_cell_disable(struct platform_device *pdev)
Andres Salomon1e29af62011-02-17 19:07:34 -080040{
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}
Andres Salomonf77289a2011-03-03 09:51:58 -080057EXPORT_SYMBOL(mfd_cell_disable);
Andres Salomon1e29af62011-02-17 19:07:34 -080058
Samuel Ortize710d7d2011-04-08 00:43:01 +020059static 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
Dmitry Baryshkov424f5252008-07-29 01:30:26 +020072static int mfd_add_device(struct device *parent, int id,
Ben Dooks7f71ac92008-07-28 18:29:09 +020073 const struct mfd_cell *cell,
74 struct resource *mem_base,
75 int irq_base)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010076{
Ian Moltona87903f2008-07-25 22:59:29 +010077 struct resource *res;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010078 struct platform_device *pdev;
79 int ret = -ENOMEM;
80 int r;
81
Mark Brown3bed6e42009-07-27 14:45:51 +010082 pdev = platform_device_alloc(cell->name, id + cell->id);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010083 if (!pdev)
84 goto fail_alloc;
85
Ian Moltona87903f2008-07-25 22:59:29 +010086 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
87 if (!res)
88 goto fail_device;
89
Dmitry Baryshkov424f5252008-07-29 01:30:26 +020090 pdev->dev.parent = parent;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010091
Samuel Ortizeb895602011-04-06 16:52:52 +020092 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
Samuel Ortize710d7d2011-04-08 00:43:01 +020099 ret = mfd_platform_add_cell(pdev, cell);
Andres Salomonfe891a02011-02-17 19:07:09 -0800100 if (ret)
101 goto fail_res;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100102
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100103 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 */
Samuel Ortizf03cfcb2010-03-26 01:09:04 +0100108 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100109 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 }
Samuel Ortiz91feded2010-02-19 11:07:59 +0100124
Daniel Drake5f2545f2010-09-30 21:55:36 +0100125 if (!cell->ignore_resource_conflicts) {
Jean Delvare855cc452012-02-18 17:54:23 +0100126 ret = acpi_check_resource_conflict(&res[r]);
Daniel Drake5f2545f2010-09-30 21:55:36 +0100127 if (ret)
128 goto fail_res;
129 }
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100130 }
131
Axel Lin8af5fe32010-05-31 17:30:55 +0800132 ret = platform_device_add_resources(pdev, res, cell->num_resources);
133 if (ret)
134 goto fail_res;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100135
136 ret = platform_device_add(pdev);
137 if (ret)
Ian Moltona87903f2008-07-25 22:59:29 +0100138 goto fail_res;
139
Mark Brown4c90aa92010-11-26 17:19:34 +0000140 if (cell->pm_runtime_no_callbacks)
141 pm_runtime_no_callbacks(&pdev->dev);
142
Ian Moltona87903f2008-07-25 22:59:29 +0100143 kfree(res);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100144
145 return 0;
146
Ian Moltona87903f2008-07-25 22:59:29 +0100147fail_res:
148 kfree(res);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100149fail_device:
150 platform_device_put(pdev);
151fail_alloc:
152 return ret;
153}
154
Dmitry Baryshkov424f5252008-07-29 01:30:26 +0200155int mfd_add_devices(struct device *parent, int id,
Andres Salomon1e29af62011-02-17 19:07:34 -0800156 struct mfd_cell *cells, int n_devs,
Ben Dooks7f71ac92008-07-28 18:29:09 +0200157 struct resource *mem_base,
158 int irq_base)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100159{
160 int i;
161 int ret = 0;
Andres Salomon1e29af62011-02-17 19:07:34 -0800162 atomic_t *cnts;
163
164 /* initialize reference counting for all cells */
Axel Lind1b5c5e2012-02-12 17:43:22 +0800165 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
Andres Salomon1e29af62011-02-17 19:07:34 -0800166 if (!cnts)
167 return -ENOMEM;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100168
169 for (i = 0; i < n_devs; i++) {
Andres Salomon1e29af62011-02-17 19:07:34 -0800170 atomic_set(&cnts[i], 0);
171 cells[i].usage_count = &cnts[i];
Dmitry Baryshkov424f5252008-07-29 01:30:26 +0200172 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100173 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
Andres Salomon1e29af62011-02-17 19:07:34 -0800184static int mfd_remove_devices_fn(struct device *dev, void *c)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100185{
Andres Salomon1e29af62011-02-17 19:07:34 -0800186 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);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100195 return 0;
196}
197
Dmitry Baryshkov424f5252008-07-29 01:30:26 +0200198void mfd_remove_devices(struct device *parent)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100199{
Andres Salomon1e29af62011-02-17 19:07:34 -0800200 atomic_t *cnts = NULL;
201
202 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
203 kfree(cnts);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100204}
205EXPORT_SYMBOL(mfd_remove_devices);
206
Andres Salomonfa1df692011-03-21 19:19:35 -0700207int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
Andres Salomona9bbba92011-02-17 19:07:35 -0800208{
209 struct mfd_cell cell_entry;
210 struct device *dev;
211 struct platform_device *pdev;
Andres Salomonfa1df692011-03-21 19:19:35 -0700212 int i;
Andres Salomona9bbba92011-02-17 19:07:35 -0800213
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
Andres Salomonfa1df692011-03-21 19:19:35 -0700225 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;
Andres Salomona9bbba92011-02-17 19:07:35 -0800234}
Andres Salomonfa1df692011-03-21 19:19:35 -0700235EXPORT_SYMBOL(mfd_clone_cell);
Andres Salomona9bbba92011-02-17 19:07:35 -0800236
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100237MODULE_LICENSE("GPL");
238MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");