Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Driver for the i2c/i2s based DAC3550a sound chip used | |
3 | * on some Apple iBooks. Also known as "DACA". | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file COPYING in the main directory of this archive | |
7 | * for more details. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/proc_fs.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/sysctl.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/init.h> | |
19 | #include <asm/uaccess.h> | |
20 | #include <asm/errno.h> | |
21 | #include <asm/io.h> | |
22 | ||
23 | #include "dmasound.h" | |
24 | ||
25 | /* FYI: This code was derived from the tas3001c.c Texas/Tumbler mixer | |
26 | * control code, as well as info derived from the AppleDACAAudio driver | |
27 | * from Darwin CVS (main thing I derived being register numbers and | |
28 | * values, as well as when to make the calls). */ | |
29 | ||
30 | #define I2C_DRIVERID_DACA (0xFDCB) | |
31 | ||
32 | #define DACA_VERSION "0.1" | |
33 | #define DACA_DATE "20010930" | |
34 | ||
35 | static int cur_left_vol; | |
36 | static int cur_right_vol; | |
37 | static struct i2c_client *daca_client; | |
38 | ||
39 | static int daca_attach_adapter(struct i2c_adapter *adapter); | |
40 | static int daca_detect_client(struct i2c_adapter *adapter, int address); | |
41 | static int daca_detach_client(struct i2c_client *client); | |
42 | ||
43 | struct i2c_driver daca_driver = { | |
d74cdab1 | 44 | .driver = { |
d74cdab1 LR |
45 | .name = "DAC3550A driver V " DACA_VERSION, |
46 | }, | |
1da177e4 | 47 | .id = I2C_DRIVERID_DACA, |
1da177e4 LT |
48 | .attach_adapter = daca_attach_adapter, |
49 | .detach_client = daca_detach_client, | |
50 | }; | |
51 | ||
52 | #define VOL_MAX ((1<<20) - 1) | |
53 | ||
54 | void daca_get_volume(uint * left_vol, uint *right_vol) | |
55 | { | |
56 | *left_vol = cur_left_vol >> 5; | |
57 | *right_vol = cur_right_vol >> 5; | |
58 | } | |
59 | ||
60 | int daca_set_volume(uint left_vol, uint right_vol) | |
61 | { | |
62 | unsigned short voldata; | |
63 | ||
64 | if (!daca_client) | |
65 | return -1; | |
66 | ||
67 | /* Derived from experience, not from any specific values */ | |
68 | left_vol <<= 5; | |
69 | right_vol <<= 5; | |
70 | ||
71 | if (left_vol > VOL_MAX) | |
72 | left_vol = VOL_MAX; | |
73 | if (right_vol > VOL_MAX) | |
74 | right_vol = VOL_MAX; | |
75 | ||
76 | voldata = ((left_vol >> 14) & 0x3f) << 8; | |
77 | voldata |= (right_vol >> 14) & 0x3f; | |
78 | ||
79 | if (i2c_smbus_write_word_data(daca_client, 2, voldata) < 0) { | |
80 | printk("daca: failed to set volume \n"); | |
81 | return -1; | |
82 | } | |
83 | ||
84 | cur_left_vol = left_vol; | |
85 | cur_right_vol = right_vol; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | int daca_leave_sleep(void) | |
91 | { | |
92 | if (!daca_client) | |
93 | return -1; | |
94 | ||
95 | /* Do a short sleep, just to make sure I2C bus is awake and paying | |
96 | * attention to us | |
97 | */ | |
98 | msleep(20); | |
99 | /* Write the sample rate reg the value it needs */ | |
100 | i2c_smbus_write_byte_data(daca_client, 1, 8); | |
101 | daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5); | |
102 | /* Another short delay, just to make sure the other I2C bus writes | |
103 | * have taken... | |
104 | */ | |
105 | msleep(20); | |
106 | /* Write the global config reg - invert right power amp, | |
107 | * DAC on, use 5-volt mode */ | |
108 | i2c_smbus_write_byte_data(daca_client, 3, 0x45); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | int daca_enter_sleep(void) | |
114 | { | |
115 | if (!daca_client) | |
116 | return -1; | |
117 | ||
118 | i2c_smbus_write_byte_data(daca_client, 1, 8); | |
119 | daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5); | |
120 | ||
121 | /* Write the global config reg - invert right power amp, | |
122 | * DAC on, enter low-power mode, use 5-volt mode | |
123 | */ | |
124 | i2c_smbus_write_byte_data(daca_client, 3, 0x65); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static int daca_attach_adapter(struct i2c_adapter *adapter) | |
130 | { | |
131 | if (!strncmp(adapter->name, "mac-io", 6)) | |
132 | daca_detect_client(adapter, 0x4d); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static int daca_init_client(struct i2c_client * new_client) | |
137 | { | |
138 | /* | |
139 | * Probe is not working with the current i2c-keywest | |
140 | * driver. We try to use addr 0x4d on each adapters | |
141 | * instead, by setting the format register. | |
142 | * | |
143 | * FIXME: I'm sure that can be obtained from the | |
144 | * device-tree. --BenH. | |
145 | */ | |
146 | ||
147 | /* Write the global config reg - invert right power amp, | |
148 | * DAC on, use 5-volt mode | |
149 | */ | |
150 | if (i2c_smbus_write_byte_data(new_client, 3, 0x45)) | |
151 | return -1; | |
152 | ||
153 | i2c_smbus_write_byte_data(new_client, 1, 8); | |
154 | daca_client = new_client; | |
155 | daca_set_volume(15000, 15000); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int daca_detect_client(struct i2c_adapter *adapter, int address) | |
161 | { | |
162 | const char *client_name = "DAC 3550A Digital Equalizer"; | |
163 | struct i2c_client *new_client; | |
164 | int rc = -ENODEV; | |
165 | ||
166 | new_client = kmalloc(sizeof(*new_client), GFP_KERNEL); | |
167 | if (!new_client) | |
168 | return -ENOMEM; | |
169 | memset(new_client, 0, sizeof(*new_client)); | |
170 | ||
171 | new_client->addr = address; | |
172 | new_client->adapter = adapter; | |
173 | new_client->driver = &daca_driver; | |
174 | new_client->flags = 0; | |
175 | strcpy(new_client->name, client_name); | |
176 | ||
177 | if (daca_init_client(new_client)) | |
178 | goto bail; | |
179 | ||
180 | /* Tell the i2c layer a new client has arrived */ | |
181 | if (i2c_attach_client(new_client)) | |
182 | goto bail; | |
183 | ||
184 | return 0; | |
185 | bail: | |
186 | kfree(new_client); | |
187 | return rc; | |
188 | } | |
189 | ||
190 | ||
191 | static int daca_detach_client(struct i2c_client *client) | |
192 | { | |
193 | if (client == daca_client) | |
194 | daca_client = NULL; | |
195 | ||
196 | i2c_detach_client(client); | |
197 | kfree(client); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | void daca_cleanup(void) | |
202 | { | |
203 | i2c_del_driver(&daca_driver); | |
204 | } | |
205 | ||
206 | int daca_init(void) | |
207 | { | |
208 | printk("dac3550a driver version %s (%s)\n",DACA_VERSION,DACA_DATE); | |
209 | return i2c_add_driver(&daca_driver); | |
210 | } |