211 lines
5.2 KiB
C
Executable File
211 lines
5.2 KiB
C
Executable File
/*
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* tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
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* Copyright (c) 2009 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-device.h>
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#define DRIVER_NAME "tef6862"
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#define FREQ_MUL 16000
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#define TEF6862_LO_FREQ (875U * FREQ_MUL / 10)
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#define TEF6862_HI_FREQ (108U * FREQ_MUL)
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/* Write mode sub addresses */
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#define WM_SUB_BANDWIDTH 0x0
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#define WM_SUB_PLLM 0x1
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#define WM_SUB_PLLL 0x2
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#define WM_SUB_DAA 0x3
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#define WM_SUB_AGC 0x4
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#define WM_SUB_BAND 0x5
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#define WM_SUB_CONTROL 0x6
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#define WM_SUB_LEVEL 0x7
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#define WM_SUB_IFCF 0x8
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#define WM_SUB_IFCAP 0x9
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#define WM_SUB_ACD 0xA
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#define WM_SUB_TEST 0xF
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/* Different modes of the MSA register */
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#define MSA_MODE_BUFFER 0x0
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#define MSA_MODE_PRESET 0x1
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#define MSA_MODE_SEARCH 0x2
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#define MSA_MODE_AF_UPDATE 0x3
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#define MSA_MODE_JUMP 0x4
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#define MSA_MODE_CHECK 0x5
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#define MSA_MODE_LOAD 0x6
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#define MSA_MODE_END 0x7
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#define MSA_MODE_SHIFT 5
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struct tef6862_state {
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struct v4l2_subdev sd;
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unsigned long freq;
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};
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static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct tef6862_state, sd);
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}
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static u16 tef6862_sigstr(struct i2c_client *client)
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{
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u8 buf[4];
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int err = i2c_master_recv(client, buf, sizeof(buf));
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if (err == sizeof(buf))
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return buf[3] << 8;
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return 0;
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}
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static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
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{
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if (v->index > 0)
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return -EINVAL;
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/* only support FM for now */
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strlcpy(v->name, "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = TEF6862_LO_FREQ;
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v->rangehigh = TEF6862_HI_FREQ;
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v->rxsubchans = V4L2_TUNER_SUB_MONO;
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v->capability = V4L2_TUNER_CAP_LOW;
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v->audmode = V4L2_TUNER_MODE_STEREO;
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v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
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return 0;
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}
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static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v)
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{
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return v->index ? -EINVAL : 0;
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}
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static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f)
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{
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struct tef6862_state *state = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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unsigned freq = f->frequency;
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u16 pll;
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u8 i2cmsg[3];
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int err;
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if (f->tuner != 0)
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return -EINVAL;
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freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ);
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pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
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i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM;
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i2cmsg[1] = (pll >> 8) & 0xff;
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i2cmsg[2] = pll & 0xff;
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err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
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if (err != sizeof(i2cmsg))
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return err < 0 ? err : -EIO;
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state->freq = freq;
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return 0;
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}
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static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
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{
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struct tef6862_state *state = to_state(sd);
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if (f->tuner != 0)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = state->freq;
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return 0;
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}
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static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
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.g_tuner = tef6862_g_tuner,
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.s_tuner = tef6862_s_tuner,
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.s_frequency = tef6862_s_frequency,
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.g_frequency = tef6862_g_frequency,
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};
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static const struct v4l2_subdev_ops tef6862_ops = {
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.tuner = &tef6862_tuner_ops,
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};
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/*
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* Generic i2c probe
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* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
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*/
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static int tef6862_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tef6862_state *state;
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struct v4l2_subdev *sd;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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state->freq = TEF6862_LO_FREQ;
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sd = &state->sd;
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v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
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return 0;
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}
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static int tef6862_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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kfree(to_state(sd));
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return 0;
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}
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static const struct i2c_device_id tef6862_id[] = {
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{DRIVER_NAME, 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, tef6862_id);
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static struct i2c_driver tef6862_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = DRIVER_NAME,
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},
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.probe = tef6862_probe,
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.remove = tef6862_remove,
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.id_table = tef6862_id,
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};
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module_i2c_driver(tef6862_driver);
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MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
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MODULE_AUTHOR("Mocean Laboratories");
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MODULE_LICENSE("GPL v2");
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