sound/oss/dmasound/tas_common.c

   1 #include <linux/module.h>
   2 #include <linux/slab.h>
   3 #include <linux/proc_fs.h>
   4 #include <linux/ioport.h>
   5 #include <linux/sysctl.h>
   6 #include <linux/types.h>
   7 #include <linux/i2c.h>
   8 #include <linux/init.h>
   9 #include <linux/soundcard.h>
  10 #include <asm/uaccess.h>
  11 #include <asm/errno.h>
  12 #include <asm/io.h>
  13 #include <asm/prom.h>
  14
  15 #include "tas_common.h"
  16
  17 #define CALL0(proc)                                                             \
  18         do {                                                                    \
  19                 struct tas_data_t *self;                                        \
  20                 if (!tas_client || driver_hooks == NULL)                        \
  21                         return -1;                                              \
  22                 self = dev_get_drvdata(&tas_client->dev);                       \
  23                 if (driver_hooks->proc)                                         \
  24                         return driver_hooks->proc(self);                        \
  25                 else                                                            \
  26                         return -EINVAL;                                         \
  27         } while (0)
  28
  29 #define CALL(proc,arg...)                                                       \
  30         do {                                                                    \
  31                 struct tas_data_t *self;                                        \
  32                 if (!tas_client || driver_hooks == NULL)                        \
  33                         return -1;                                              \
  34                 self = dev_get_drvdata(&tas_client->dev);                       \
  35                 if (driver_hooks->proc)                                         \
  36                         return driver_hooks->proc(self, ## arg);                \
  37                 else                                                            \
  38                         return -EINVAL;                                         \
  39         } while (0)
  40
  41
  42 static u8 tas_i2c_address = 0x34;
  43 static struct i2c_client *tas_client;
  44
  45 static int tas_attach_adapter(struct i2c_adapter *);
  46 static int tas_detach_client(struct i2c_client *);
  47
  48 struct i2c_driver tas_driver = {
  49         .driver = {
  50                 .name   = "tas",
  51         },
  52         .attach_adapter = tas_attach_adapter,
  53         .detach_client  = tas_detach_client,
  54 };
  55
  56 struct tas_driver_hooks_t *driver_hooks;
  57
  58 int
  59 tas_register_driver(struct tas_driver_hooks_t *hooks)
  60 {
  61         driver_hooks = hooks;
  62         return 0;
  63 }
  64
  65 int
  66 tas_get_mixer_level(int mixer, uint *level)
  67 {
  68         CALL(get_mixer_level,mixer,level);
  69 }
  70
  71 int
  72 tas_set_mixer_level(int mixer,uint level)
  73 {
  74         CALL(set_mixer_level,mixer,level);
  75 }
  76
  77 int
  78 tas_enter_sleep(void)
  79 {
  80         CALL0(enter_sleep);
  81 }
  82
  83 int
  84 tas_leave_sleep(void)
  85 {
  86         CALL0(leave_sleep);
  87 }
  88
  89 int
  90 tas_supported_mixers(void)
  91 {
  92         CALL0(supported_mixers);
  93 }
  94
  95 int
  96 tas_mixer_is_stereo(int mixer)
  97 {
  98         CALL(mixer_is_stereo,mixer);
  99 }
 100
 101 int
 102 tas_stereo_mixers(void)
 103 {
 104         CALL0(stereo_mixers);
 105 }
 106
 107 int
 108 tas_output_device_change(int device_id,int layout_id,int speaker_id)
 109 {
 110         CALL(output_device_change,device_id,layout_id,speaker_id);
 111 }
 112
 113 int
 114 tas_device_ioctl(u_int cmd, u_long arg)
 115 {
 116         CALL(device_ioctl,cmd,arg);
 117 }
 118
 119 int
 120 tas_post_init(void)
 121 {
 122         CALL0(post_init);
 123 }
 124
 125 static int
 126 tas_detect_client(struct i2c_adapter *adapter, int address)
 127 {
 128         static const char *client_name = "tas Digital Equalizer";
 129         struct i2c_client *new_client;
 130         int rc = -ENODEV;
 131
 132         if (!driver_hooks) {
 133                 printk(KERN_ERR "tas_detect_client called with no hooks !\n");
 134                 return -ENODEV;
 135         }
 136
 137         new_client = kzalloc(sizeof(*new_client), GFP_KERNEL);
 138         if (!new_client)
 139                 return -ENOMEM;
 140
 141         new_client->addr = address;
 142         new_client->adapter = adapter;
 143         new_client->driver = &tas_driver;
 144         strlcpy(new_client->name, client_name, DEVICE_NAME_SIZE);
 145
 146         if (driver_hooks->init(new_client))
 147                 goto bail;
 148
 149         /* Tell the i2c layer a new client has arrived */
 150         if (i2c_attach_client(new_client)) {
 151                 driver_hooks->uninit(dev_get_drvdata(&new_client->dev));
 152                 goto bail;
 153         }
 154
 155         tas_client = new_client;
 156         return 0;
 157  bail:
 158         tas_client = NULL;
 159         kfree(new_client);
 160         return rc;
 161 }
 162
 163 static int
 164 tas_attach_adapter(struct i2c_adapter *adapter)
 165 {
 166         if (!strncmp(adapter->name, "mac-io", 6))
 167                 return tas_detect_client(adapter, tas_i2c_address);
 168         return 0;
 169 }
 170
 171 static int
 172 tas_detach_client(struct i2c_client *client)
 173 {
 174         if (client == tas_client) {
 175                 driver_hooks->uninit(dev_get_drvdata(&client->dev));
 176
 177                 i2c_detach_client(client);
 178                 kfree(client);
 179         }
 180         return 0;
 181 }
 182
 183 void
 184 tas_cleanup(void)
 185 {
 186         i2c_del_driver(&tas_driver);
 187 }
 188
 189 int __init
 190 tas_init(int driver_id, const char *driver_name)
 191 {
 192         const u32* paddr;
 193         struct device_node *tas_node;
 194
 195         printk(KERN_INFO "tas driver [%s])\n", driver_name);
 196
 197 #ifndef CONFIG_I2C_POWERMAC
 198         request_module("i2c-powermac");
 199 #endif
 200         tas_node = of_find_node_by_name("deq");
 201         if (tas_node == NULL)
 202                 return -ENODEV;
 203         paddr = of_get_property(tas_node, "i2c-address", NULL);
 204         if (paddr) {
 205                 tas_i2c_address = (*paddr) >> 1;
 206                 printk(KERN_INFO "using i2c address: 0x%x from device-tree\n",
 207                                 tas_i2c_address);
 208         } else
 209                 printk(KERN_INFO "using i2c address: 0x%x (default)\n",
 210                                 tas_i2c_address);
 211         of_node_put(tas_node);
 212
 213         return i2c_add_driver(&tas_driver);
 214 }