diff options
Diffstat (limited to 'drivers/media/video/wm8775.c')
| -rw-r--r-- | drivers/media/video/wm8775.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/media/video/wm8775.c b/drivers/media/video/wm8775.c new file mode 100644 index 000000000000..22f286222004 --- /dev/null +++ b/drivers/media/video/wm8775.c @@ -0,0 +1,254 @@ +/* + * wm8775 - driver version 0.0.1 + * + * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to> + * + * Based on saa7115 driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/ioctl.h> +#include <asm/uaccess.h> +#include <linux/i2c.h> +#include <linux/i2c-id.h> +#include <linux/videodev.h> +#include <media/audiochip.h> + +MODULE_DESCRIPTION("wm8775 driver"); +MODULE_AUTHOR("Ulf Eklund"); +MODULE_LICENSE("GPL"); + +#define wm8775_err(fmt, arg...) do { \ + printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->name, \ + i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0) +#define wm8775_info(fmt, arg...) do { \ + printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->name, \ + i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0) + + +static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END }; + + +I2C_CLIENT_INSMOD; + +/* ----------------------------------------------------------------------- */ + +enum { + R7 = 7, R11 = 11, + R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23, + TOT_REGS +}; + +struct wm8775_state { + u8 input; /* Last selected input (0-0xf) */ + u8 muted; +}; + +static int wm8775_write(struct i2c_client *client, int reg, u16 val) +{ + int i; + + if (reg < 0 || reg >= TOT_REGS) { + wm8775_err("Invalid register R%d\n", reg); + return -1; + } + + for (i = 0; i < 3; i++) { + if (i2c_smbus_write_byte_data(client, (reg << 1) | + (val >> 8), val & 0xff) == 0) { + return 0; + } + } + wm8775_err("I2C: cannot write %03x to register R%d\n", val, reg); + return -1; +} + +static int wm8775_command(struct i2c_client *client, unsigned int cmd, + void *arg) +{ + struct wm8775_state *state = i2c_get_clientdata(client); + int *input = arg; + + switch (cmd) { + case AUDC_SET_INPUT: + wm8775_write(client, R21, 0x0c0); + wm8775_write(client, R14, 0x1d4); + wm8775_write(client, R15, 0x1d4); + + if (*input == AUDIO_RADIO) { + wm8775_write(client, R21, 0x108); + state->input = 8; + state->muted = 0; + break; + } + if (*input == AUDIO_MUTE) { + state->muted = 1; + break; + } + if (*input == AUDIO_UNMUTE) { + wm8775_write(client, R21, 0x100 + state->input); + state->muted = 0; + break; + } + /* All other inputs... */ + wm8775_write(client, R21, 0x102); + state->input = 2; + state->muted = 0; + break; + + case VIDIOC_LOG_STATUS: + wm8775_info("Input: %s%s\n", + state->input == 8 ? "radio" : "default", + state->muted ? " (muted)" : ""); + break; + + case VIDIOC_S_FREQUENCY: + /* If I remove this, then it can happen that I have no + sound the first time I tune from static to a valid channel. + It's difficult to reproduce and is almost certainly related + to the zero cross detect circuit. */ + wm8775_write(client, R21, 0x0c0); + wm8775_write(client, R14, 0x1d4); + wm8775_write(client, R15, 0x1d4); + wm8775_write(client, R21, 0x100 + state->input); + break; + + default: + return -EINVAL; + } + return 0; +} + +/* ----------------------------------------------------------------------- */ + +/* i2c implementation */ + +/* + * Generic i2c probe + * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' + */ + +static struct i2c_driver i2c_driver; + +static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind) +{ + struct i2c_client *client; + struct wm8775_state *state; + + /* Check if the adapter supports the needed features */ + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return 0; + + client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); + if (client == 0) + return -ENOMEM; + + memset(client, 0, sizeof(struct i2c_client)); + client->addr = address; + client->adapter = adapter; + client->driver = &i2c_driver; + client->flags = I2C_CLIENT_ALLOW_USE; + snprintf(client->name, sizeof(client->name) - 1, "wm8775"); + + wm8775_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name); + + state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL); + if (state == NULL) { + kfree(client); + return -ENOMEM; + } + state->input = 2; + state->muted = 0; + i2c_set_clientdata(client, state); + + /* initialize wm8775 */ + wm8775_write(client, R23, 0x000); /* RESET */ + wm8775_write(client, R7, 0x000); /* Disable zero cross detect timeout */ + wm8775_write(client, R11, 0x021); /* Left justified, 24-bit mode */ + wm8775_write(client, R12, 0x102); /* Master mode, clock ratio 256fs */ + wm8775_write(client, R13, 0x000); /* Powered up */ + wm8775_write(client, R14, 0x1d4); /* ADC gain +2.5dB, enable zero cross */ + wm8775_write(client, R15, 0x1d4); /* ADC gain +2.5dB, enable zero cross */ + wm8775_write(client, R16, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */ + /* max gain +8dB */ + wm8775_write(client, R17, 0x185); /* Enable gain control, use zero cross */ + /* detection, ALC hold time 42.6 ms */ + wm8775_write(client, R18, 0x0a2); /* ALC gain ramp up delay 34 s, */ + /* ALC gain ramp down delay 33 ms */ + wm8775_write(client, R19, 0x005); /* Enable noise gate, threshold -72dBfs */ + wm8775_write(client, R20, 0x07a); /* Transient window 4ms, lower PGA gain */ + /* limit -1dB */ + wm8775_write(client, R21, 0x102); /* LRBOTH = 1, use input 2. */ + i2c_attach_client(client); + + return 0; +} + +static int wm8775_probe(struct i2c_adapter *adapter) +{ +#ifdef I2C_CLASS_TV_ANALOG + if (adapter->class & I2C_CLASS_TV_ANALOG) +#else + if (adapter->id == I2C_HW_B_BT848) +#endif + return i2c_probe(adapter, &addr_data, wm8775_attach); + return 0; +} + +static int wm8775_detach(struct i2c_client *client) +{ + int err; + + err = i2c_detach_client(client); + if (err) { + return err; + } + kfree(client); + + return 0; +} + +/* ----------------------------------------------------------------------- */ + +/* i2c implementation */ +static struct i2c_driver i2c_driver = { + .name = "wm8775", + + .id = I2C_DRIVERID_WM8775, + .flags = I2C_DF_NOTIFY, + + .attach_adapter = wm8775_probe, + .detach_client = wm8775_detach, + .command = wm8775_command, + .owner = THIS_MODULE, +}; + + +static int __init wm8775_init_module(void) +{ + return i2c_add_driver(&i2c_driver); +} + +static void __exit wm8775_cleanup_module(void) +{ + i2c_del_driver(&i2c_driver); +} + +module_init(wm8775_init_module); +module_exit(wm8775_cleanup_module); |
