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// SPDX-License-Identifier: GPL-2.0-only
/*
* tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
* Copyright (c) 2009 Intel Corporation
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#define DRIVER_NAME "tef6862"
#define FREQ_MUL 16000
#define TEF6862_LO_FREQ (875U * FREQ_MUL / 10)
#define TEF6862_HI_FREQ (108U * FREQ_MUL)
/* Write mode sub addresses */
#define WM_SUB_BANDWIDTH 0x0
#define WM_SUB_PLLM 0x1
#define WM_SUB_PLLL 0x2
#define WM_SUB_DAA 0x3
#define WM_SUB_AGC 0x4
#define WM_SUB_BAND 0x5
#define WM_SUB_CONTROL 0x6
#define WM_SUB_LEVEL 0x7
#define WM_SUB_IFCF 0x8
#define WM_SUB_IFCAP 0x9
#define WM_SUB_ACD 0xA
#define WM_SUB_TEST 0xF
/* Different modes of the MSA register */
#define MSA_MODE_BUFFER 0x0
#define MSA_MODE_PRESET 0x1
#define MSA_MODE_SEARCH 0x2
#define MSA_MODE_AF_UPDATE 0x3
#define MSA_MODE_JUMP 0x4
#define MSA_MODE_CHECK 0x5
#define MSA_MODE_LOAD 0x6
#define MSA_MODE_END 0x7
#define MSA_MODE_SHIFT 5
struct tef6862_state {
struct v4l2_subdev sd;
unsigned long freq;
};
static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct tef6862_state, sd);
}
static u16 tef6862_sigstr(struct i2c_client *client)
{
u8 buf[4];
int err = i2c_master_recv(client, buf, sizeof(buf));
if (err == sizeof(buf))
return buf[3] << 8;
return 0;
}
static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
{
if (v->index > 0)
return -EINVAL;
/* only support FM for now */
strscpy(v->name, "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->rangelow = TEF6862_LO_FREQ;
v->rangehigh = TEF6862_HI_FREQ;
v->rxsubchans = V4L2_TUNER_SUB_MONO;
v->capability = V4L2_TUNER_CAP_LOW;
v->audmode = V4L2_TUNER_MODE_STEREO;
v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
return 0;
}
static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v)
{
return v->index ? -EINVAL : 0;
}
static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f)
{
struct tef6862_state *state = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
unsigned freq = f->frequency;
u16 pll;
u8 i2cmsg[3];
int err;
if (f->tuner != 0)
return -EINVAL;
freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ);
pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM;
i2cmsg[1] = (pll >> 8) & 0xff;
i2cmsg[2] = pll & 0xff;
err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
if (err != sizeof(i2cmsg))
return err < 0 ? err : -EIO;
state->freq = freq;
return 0;
}
static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
{
struct tef6862_state *state = to_state(sd);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = state->freq;
return 0;
}
static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
.g_tuner = tef6862_g_tuner,
.s_tuner = tef6862_s_tuner,
.s_frequency = tef6862_s_frequency,
.g_frequency = tef6862_g_frequency,
};
static const struct v4l2_subdev_ops tef6862_ops = {
.tuner = &tef6862_tuner_ops,
};
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static int tef6862_probe(struct i2c_client *client)
{
struct tef6862_state *state;
struct v4l2_subdev *sd;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
if (state == NULL)
return -ENOMEM;
state->freq = TEF6862_LO_FREQ;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
return 0;
}
static void tef6862_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(to_state(sd));
}
static const struct i2c_device_id tef6862_id[] = {
{DRIVER_NAME, 0},
{},
};
MODULE_DEVICE_TABLE(i2c, tef6862_id);
static struct i2c_driver tef6862_driver = {
.driver = {
.name = DRIVER_NAME,
},
.probe_new = tef6862_probe,
.remove = tef6862_remove,
.id_table = tef6862_id,
};
module_i2c_driver(tef6862_driver);
MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
MODULE_AUTHOR("Mocean Laboratories");
MODULE_LICENSE("GPL v2");
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