diff options
Diffstat (limited to 'sound/oss/dmasound/dac3550a.c')
| -rw-r--r-- | sound/oss/dmasound/dac3550a.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/sound/oss/dmasound/dac3550a.c b/sound/oss/dmasound/dac3550a.c new file mode 100644 index 00000000000..533895eba0e --- /dev/null +++ b/sound/oss/dmasound/dac3550a.c @@ -0,0 +1,210 @@ +/* + * Driver for the i2c/i2s based DAC3550a sound chip used + * on some Apple iBooks. Also known as "DACA". + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/proc_fs.h> +#include <linux/ioport.h> +#include <linux/sysctl.h> +#include <linux/types.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <asm/uaccess.h> +#include <asm/errno.h> +#include <asm/io.h> + +#include "dmasound.h" + +/* FYI: This code was derived from the tas3001c.c Texas/Tumbler mixer + * control code, as well as info derived from the AppleDACAAudio driver + * from Darwin CVS (main thing I derived being register numbers and + * values, as well as when to make the calls). */ + +#define I2C_DRIVERID_DACA (0xFDCB) + +#define DACA_VERSION "0.1" +#define DACA_DATE "20010930" + +static int cur_left_vol; +static int cur_right_vol; +static struct i2c_client *daca_client; + +static int daca_attach_adapter(struct i2c_adapter *adapter); +static int daca_detect_client(struct i2c_adapter *adapter, int address); +static int daca_detach_client(struct i2c_client *client); + +struct i2c_driver daca_driver = { + .owner = THIS_MODULE, + .name = "DAC3550A driver V " DACA_VERSION, + .id = I2C_DRIVERID_DACA, + .flags = I2C_DF_NOTIFY, + .attach_adapter = daca_attach_adapter, + .detach_client = daca_detach_client, +}; + +#define VOL_MAX ((1<<20) - 1) + +void daca_get_volume(uint * left_vol, uint *right_vol) +{ + *left_vol = cur_left_vol >> 5; + *right_vol = cur_right_vol >> 5; +} + +int daca_set_volume(uint left_vol, uint right_vol) +{ + unsigned short voldata; + + if (!daca_client) + return -1; + + /* Derived from experience, not from any specific values */ + left_vol <<= 5; + right_vol <<= 5; + + if (left_vol > VOL_MAX) + left_vol = VOL_MAX; + if (right_vol > VOL_MAX) + right_vol = VOL_MAX; + + voldata = ((left_vol >> 14) & 0x3f) << 8; + voldata |= (right_vol >> 14) & 0x3f; + + if (i2c_smbus_write_word_data(daca_client, 2, voldata) < 0) { + printk("daca: failed to set volume \n"); + return -1; + } + + cur_left_vol = left_vol; + cur_right_vol = right_vol; + + return 0; +} + +int daca_leave_sleep(void) +{ + if (!daca_client) + return -1; + + /* Do a short sleep, just to make sure I2C bus is awake and paying + * attention to us + */ + msleep(20); + /* Write the sample rate reg the value it needs */ + i2c_smbus_write_byte_data(daca_client, 1, 8); + daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5); + /* Another short delay, just to make sure the other I2C bus writes + * have taken... + */ + msleep(20); + /* Write the global config reg - invert right power amp, + * DAC on, use 5-volt mode */ + i2c_smbus_write_byte_data(daca_client, 3, 0x45); + + return 0; +} + +int daca_enter_sleep(void) +{ + if (!daca_client) + return -1; + + i2c_smbus_write_byte_data(daca_client, 1, 8); + daca_set_volume(cur_left_vol >> 5, cur_right_vol >> 5); + + /* Write the global config reg - invert right power amp, + * DAC on, enter low-power mode, use 5-volt mode + */ + i2c_smbus_write_byte_data(daca_client, 3, 0x65); + + return 0; +} + +static int daca_attach_adapter(struct i2c_adapter *adapter) +{ + if (!strncmp(adapter->name, "mac-io", 6)) + daca_detect_client(adapter, 0x4d); + return 0; +} + +static int daca_init_client(struct i2c_client * new_client) +{ + /* + * Probe is not working with the current i2c-keywest + * driver. We try to use addr 0x4d on each adapters + * instead, by setting the format register. + * + * FIXME: I'm sure that can be obtained from the + * device-tree. --BenH. + */ + + /* Write the global config reg - invert right power amp, + * DAC on, use 5-volt mode + */ + if (i2c_smbus_write_byte_data(new_client, 3, 0x45)) + return -1; + + i2c_smbus_write_byte_data(new_client, 1, 8); + daca_client = new_client; + daca_set_volume(15000, 15000); + + return 0; +} + +static int daca_detect_client(struct i2c_adapter *adapter, int address) +{ + const char *client_name = "DAC 3550A Digital Equalizer"; + struct i2c_client *new_client; + int rc = -ENODEV; + + new_client = kmalloc(sizeof(*new_client), GFP_KERNEL); + if (!new_client) + return -ENOMEM; + memset(new_client, 0, sizeof(*new_client)); + + new_client->addr = address; + new_client->adapter = adapter; + new_client->driver = &daca_driver; + new_client->flags = 0; + strcpy(new_client->name, client_name); + + if (daca_init_client(new_client)) + goto bail; + + /* Tell the i2c layer a new client has arrived */ + if (i2c_attach_client(new_client)) + goto bail; + + return 0; + bail: + kfree(new_client); + return rc; +} + + +static int daca_detach_client(struct i2c_client *client) +{ + if (client == daca_client) + daca_client = NULL; + + i2c_detach_client(client); + kfree(client); + return 0; +} + +void daca_cleanup(void) +{ + i2c_del_driver(&daca_driver); +} + +int daca_init(void) +{ + printk("dac3550a driver version %s (%s)\n",DACA_VERSION,DACA_DATE); + return i2c_add_driver(&daca_driver); +} |