fbmem: don't allow too huge resolutions
[linux-2.6-microblaze.git] / sound / ppc / keywest.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * common keywest i2c layer
4  *
5  * Copyright (c) by Takashi Iwai <tiwai@suse.de>
6  */
7
8
9 #include <linux/init.h>
10 #include <linux/i2c.h>
11 #include <linux/delay.h>
12 #include <linux/module.h>
13 #include <sound/core.h>
14 #include "pmac.h"
15
16 static struct pmac_keywest *keywest_ctx;
17 static bool keywest_probed;
18
19 static int keywest_probe(struct i2c_client *client,
20                          const struct i2c_device_id *id)
21 {
22         keywest_probed = true;
23         /* If instantiated via i2c-powermac, we still need to set the client */
24         if (!keywest_ctx->client)
25                 keywest_ctx->client = client;
26         i2c_set_clientdata(client, keywest_ctx);
27         return 0;
28 }
29
30 /*
31  * This is kind of a hack, best would be to turn powermac to fixed i2c
32  * bus numbers and declare the sound device as part of platform
33  * initialization
34  */
35 static int keywest_attach_adapter(struct i2c_adapter *adapter)
36 {
37         struct i2c_board_info info;
38         struct i2c_client *client;
39
40         if (! keywest_ctx)
41                 return -EINVAL;
42
43         if (strncmp(adapter->name, "mac-io", 6))
44                 return -EINVAL; /* ignored */
45
46         memset(&info, 0, sizeof(struct i2c_board_info));
47         strscpy(info.type, "keywest", I2C_NAME_SIZE);
48         info.addr = keywest_ctx->addr;
49         client = i2c_new_client_device(adapter, &info);
50         if (IS_ERR(client))
51                 return PTR_ERR(client);
52         keywest_ctx->client = client;
53
54         /*
55          * We know the driver is already loaded, so the device should be
56          * already bound. If not it means binding failed, and then there
57          * is no point in keeping the device instantiated.
58          */
59         if (!keywest_ctx->client->dev.driver) {
60                 i2c_unregister_device(keywest_ctx->client);
61                 keywest_ctx->client = NULL;
62                 return -ENODEV;
63         }
64         
65         /*
66          * Let i2c-core delete that device on driver removal.
67          * This is safe because i2c-core holds the core_lock mutex for us.
68          */
69         list_add_tail(&keywest_ctx->client->detected,
70                       &to_i2c_driver(keywest_ctx->client->dev.driver)->clients);
71         return 0;
72 }
73
74 static int keywest_remove(struct i2c_client *client)
75 {
76         if (! keywest_ctx)
77                 return 0;
78         if (client == keywest_ctx->client)
79                 keywest_ctx->client = NULL;
80
81         return 0;
82 }
83
84
85 static const struct i2c_device_id keywest_i2c_id[] = {
86         { "MAC,tas3004", 0 },           /* instantiated by i2c-powermac */
87         { "keywest", 0 },               /* instantiated by us if needed */
88         { }
89 };
90 MODULE_DEVICE_TABLE(i2c, keywest_i2c_id);
91
92 static struct i2c_driver keywest_driver = {
93         .driver = {
94                 .name = "PMac Keywest Audio",
95         },
96         .probe = keywest_probe,
97         .remove = keywest_remove,
98         .id_table = keywest_i2c_id,
99 };
100
101 /* exported */
102 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
103 {
104         if (keywest_ctx && keywest_ctx == i2c) {
105                 i2c_del_driver(&keywest_driver);
106                 keywest_ctx = NULL;
107         }
108 }
109
110 int snd_pmac_tumbler_post_init(void)
111 {
112         int err;
113         
114         if (!keywest_ctx || !keywest_ctx->client)
115                 return -ENXIO;
116
117         err = keywest_ctx->init_client(keywest_ctx);
118         if (err < 0) {
119                 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
120                 return err;
121         }
122         return 0;
123 }
124
125 /* exported */
126 int snd_pmac_keywest_init(struct pmac_keywest *i2c)
127 {
128         struct i2c_adapter *adap;
129         int err, i = 0;
130
131         if (keywest_ctx)
132                 return -EBUSY;
133
134         adap = i2c_get_adapter(0);
135         if (!adap)
136                 return -EPROBE_DEFER;
137
138         keywest_ctx = i2c;
139
140         err = i2c_add_driver(&keywest_driver);
141         if (err) {
142                 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
143                 i2c_put_adapter(adap);
144                 return err;
145         }
146
147         /* There was already a device from i2c-powermac. Great, let's return */
148         if (keywest_probed)
149                 return 0;
150
151         /* We assume Macs have consecutive I2C bus numbers starting at 0 */
152         while (adap) {
153                 /* Scan for devices to be bound to */
154                 err = keywest_attach_adapter(adap);
155                 if (!err)
156                         return 0;
157                 i2c_put_adapter(adap);
158                 adap = i2c_get_adapter(++i);
159         }
160
161         return -ENODEV;
162 }