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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
198 lines
4.6 KiB
C
198 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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strscpy(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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.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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