2 * Driver for the i2c/i2s based DAC3550a sound chip used
3 * on some Apple iBooks. Also known as "DACA".
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
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>
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). */
30 #define I2C_DRIVERID_DACA (0xFDCB)
32 #define DACA_VERSION "0.1"
33 #define DACA_DATE "20010930"
35 static int cur_left_vol;
36 static int cur_right_vol;
37 static struct i2c_client *daca_client;
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);
43 struct i2c_driver daca_driver = {
45 .name = "DAC3550A driver V " DACA_VERSION,
46 .id = I2C_DRIVERID_DACA,
47 .flags = I2C_DF_NOTIFY,
48 .attach_adapter = daca_attach_adapter,
49 .detach_client = daca_detach_client,
52 #define VOL_MAX ((1<<20) - 1)
54 void daca_get_volume(uint * left_vol, uint *right_vol)
56 *left_vol = cur_left_vol >> 5;
57 *right_vol = cur_right_vol >> 5;
60 int daca_set_volume(uint left_vol, uint right_vol)
62 unsigned short voldata;
67 /* Derived from experience, not from any specific values */
71 if (left_vol > VOL_MAX)
73 if (right_vol > VOL_MAX)
76 voldata = ((left_vol >> 14) & 0x3f) << 8;
77 voldata |= (right_vol >> 14) & 0x3f;
79 if (i2c_smbus_write_word_data(daca_client, 2, voldata) < 0) {
80 printk("daca: failed to set volume \n");
84 cur_left_vol = left_vol;
85 cur_right_vol = right_vol;
90 int daca_leave_sleep(void)
95 /* Do a short sleep, just to make sure I2C bus is awake and paying
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
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);
113 int daca_enter_sleep(void)
118 i2c_smbus_write_byte_data(daca_client, 1, 8);
119 daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5);
121 /* Write the global config reg - invert right power amp,
122 * DAC on, enter low-power mode, use 5-volt mode
124 i2c_smbus_write_byte_data(daca_client, 3, 0x65);
129 static int daca_attach_adapter(struct i2c_adapter *adapter)
131 if (!strncmp(adapter->name, "mac-io", 6))
132 daca_detect_client(adapter, 0x4d);
136 static int daca_init_client(struct i2c_client * new_client)
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.
143 * FIXME: I'm sure that can be obtained from the
144 * device-tree. --BenH.
147 /* Write the global config reg - invert right power amp,
148 * DAC on, use 5-volt mode
150 if (i2c_smbus_write_byte_data(new_client, 3, 0x45))
153 i2c_smbus_write_byte_data(new_client, 1, 8);
154 daca_client = new_client;
155 daca_set_volume(15000, 15000);
160 static int daca_detect_client(struct i2c_adapter *adapter, int address)
162 const char *client_name = "DAC 3550A Digital Equalizer";
163 struct i2c_client *new_client;
166 new_client = kmalloc(sizeof(*new_client), GFP_KERNEL);
169 memset(new_client, 0, sizeof(*new_client));
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);
177 if (daca_init_client(new_client))
180 /* Tell the i2c layer a new client has arrived */
181 if (i2c_attach_client(new_client))
191 static int daca_detach_client(struct i2c_client *client)
193 if (client == daca_client)
196 i2c_detach_client(client);
201 void daca_cleanup(void)
203 i2c_del_driver(&daca_driver);
208 printk("dac3550a driver version %s (%s)\n",DACA_VERSION,DACA_DATE);
209 return i2c_add_driver(&daca_driver);