1eea85b0aSRichard Röjfors /* 2eea85b0aSRichard Röjfors * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner 3eea85b0aSRichard Röjfors * Copyright (c) 2009 Intel Corporation 4eea85b0aSRichard Röjfors * 5eea85b0aSRichard Röjfors * This program is free software; you can redistribute it and/or modify 6eea85b0aSRichard Röjfors * it under the terms of the GNU General Public License version 2 as 7eea85b0aSRichard Röjfors * published by the Free Software Foundation. 8eea85b0aSRichard Röjfors * 9eea85b0aSRichard Röjfors * This program is distributed in the hope that it will be useful, 10eea85b0aSRichard Röjfors * but WITHOUT ANY WARRANTY; without even the implied warranty of 11eea85b0aSRichard Röjfors * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12eea85b0aSRichard Röjfors * GNU General Public License for more details. 13eea85b0aSRichard Röjfors */ 14eea85b0aSRichard Röjfors 15eea85b0aSRichard Röjfors #include <linux/module.h> 16eea85b0aSRichard Röjfors #include <linux/init.h> 17eea85b0aSRichard Röjfors #include <linux/errno.h> 18eea85b0aSRichard Röjfors #include <linux/kernel.h> 19eea85b0aSRichard Röjfors #include <linux/interrupt.h> 20eea85b0aSRichard Röjfors #include <linux/i2c.h> 215a0e3ad6STejun Heo #include <linux/slab.h> 22eea85b0aSRichard Röjfors #include <media/v4l2-ioctl.h> 23eea85b0aSRichard Röjfors #include <media/v4l2-device.h> 24eea85b0aSRichard Röjfors 25eea85b0aSRichard Röjfors #define DRIVER_NAME "tef6862" 26eea85b0aSRichard Röjfors 27eea85b0aSRichard Röjfors #define FREQ_MUL 16000 28eea85b0aSRichard Röjfors 29fa915996SHans Verkuil #define TEF6862_LO_FREQ (875U * FREQ_MUL / 10) 30fa915996SHans Verkuil #define TEF6862_HI_FREQ (108U * FREQ_MUL) 31eea85b0aSRichard Röjfors 32eea85b0aSRichard Röjfors /* Write mode sub addresses */ 33eea85b0aSRichard Röjfors #define WM_SUB_BANDWIDTH 0x0 34eea85b0aSRichard Röjfors #define WM_SUB_PLLM 0x1 35eea85b0aSRichard Röjfors #define WM_SUB_PLLL 0x2 36eea85b0aSRichard Röjfors #define WM_SUB_DAA 0x3 37eea85b0aSRichard Röjfors #define WM_SUB_AGC 0x4 38eea85b0aSRichard Röjfors #define WM_SUB_BAND 0x5 39eea85b0aSRichard Röjfors #define WM_SUB_CONTROL 0x6 40eea85b0aSRichard Röjfors #define WM_SUB_LEVEL 0x7 41eea85b0aSRichard Röjfors #define WM_SUB_IFCF 0x8 42eea85b0aSRichard Röjfors #define WM_SUB_IFCAP 0x9 43eea85b0aSRichard Röjfors #define WM_SUB_ACD 0xA 44eea85b0aSRichard Röjfors #define WM_SUB_TEST 0xF 45eea85b0aSRichard Röjfors 46eea85b0aSRichard Röjfors /* Different modes of the MSA register */ 475f27ca41SMauro Carvalho Chehab #define MSA_MODE_BUFFER 0x0 485f27ca41SMauro Carvalho Chehab #define MSA_MODE_PRESET 0x1 495f27ca41SMauro Carvalho Chehab #define MSA_MODE_SEARCH 0x2 505f27ca41SMauro Carvalho Chehab #define MSA_MODE_AF_UPDATE 0x3 515f27ca41SMauro Carvalho Chehab #define MSA_MODE_JUMP 0x4 525f27ca41SMauro Carvalho Chehab #define MSA_MODE_CHECK 0x5 535f27ca41SMauro Carvalho Chehab #define MSA_MODE_LOAD 0x6 545f27ca41SMauro Carvalho Chehab #define MSA_MODE_END 0x7 555f27ca41SMauro Carvalho Chehab #define MSA_MODE_SHIFT 5 56eea85b0aSRichard Röjfors 57eea85b0aSRichard Röjfors struct tef6862_state { 58eea85b0aSRichard Röjfors struct v4l2_subdev sd; 59eea85b0aSRichard Röjfors unsigned long freq; 60eea85b0aSRichard Röjfors }; 61eea85b0aSRichard Röjfors 62eea85b0aSRichard Röjfors static inline struct tef6862_state *to_state(struct v4l2_subdev *sd) 63eea85b0aSRichard Röjfors { 64eea85b0aSRichard Röjfors return container_of(sd, struct tef6862_state, sd); 65eea85b0aSRichard Röjfors } 66eea85b0aSRichard Röjfors 67eea85b0aSRichard Röjfors static u16 tef6862_sigstr(struct i2c_client *client) 68eea85b0aSRichard Röjfors { 69eea85b0aSRichard Röjfors u8 buf[4]; 70eea85b0aSRichard Röjfors int err = i2c_master_recv(client, buf, sizeof(buf)); 71eea85b0aSRichard Röjfors if (err == sizeof(buf)) 72eea85b0aSRichard Röjfors return buf[3] << 8; 73eea85b0aSRichard Röjfors return 0; 74eea85b0aSRichard Röjfors } 75eea85b0aSRichard Röjfors 76eea85b0aSRichard Röjfors static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) 77eea85b0aSRichard Röjfors { 78eea85b0aSRichard Röjfors if (v->index > 0) 79eea85b0aSRichard Röjfors return -EINVAL; 80eea85b0aSRichard Röjfors 81eea85b0aSRichard Röjfors /* only support FM for now */ 82c0decac1SMauro Carvalho Chehab strscpy(v->name, "FM", sizeof(v->name)); 83eea85b0aSRichard Röjfors v->type = V4L2_TUNER_RADIO; 84eea85b0aSRichard Röjfors v->rangelow = TEF6862_LO_FREQ; 85eea85b0aSRichard Röjfors v->rangehigh = TEF6862_HI_FREQ; 86eea85b0aSRichard Röjfors v->rxsubchans = V4L2_TUNER_SUB_MONO; 87eea85b0aSRichard Röjfors v->capability = V4L2_TUNER_CAP_LOW; 88eea85b0aSRichard Röjfors v->audmode = V4L2_TUNER_MODE_STEREO; 89eea85b0aSRichard Röjfors v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd)); 90eea85b0aSRichard Röjfors 91eea85b0aSRichard Röjfors return 0; 92eea85b0aSRichard Röjfors } 93eea85b0aSRichard Röjfors 942f73c7c5SHans Verkuil static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v) 95eea85b0aSRichard Röjfors { 96eea85b0aSRichard Röjfors return v->index ? -EINVAL : 0; 97eea85b0aSRichard Röjfors } 98eea85b0aSRichard Röjfors 99b530a447SHans Verkuil static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f) 100eea85b0aSRichard Röjfors { 101eea85b0aSRichard Röjfors struct tef6862_state *state = to_state(sd); 102eea85b0aSRichard Röjfors struct i2c_client *client = v4l2_get_subdevdata(sd); 103fa915996SHans Verkuil unsigned freq = f->frequency; 104eea85b0aSRichard Röjfors u16 pll; 105eea85b0aSRichard Röjfors u8 i2cmsg[3]; 106eea85b0aSRichard Röjfors int err; 107eea85b0aSRichard Röjfors 108eea85b0aSRichard Röjfors if (f->tuner != 0) 109eea85b0aSRichard Röjfors return -EINVAL; 110eea85b0aSRichard Röjfors 1119ba6a91fSHans Verkuil freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ); 112fa915996SHans Verkuil pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL; 1135f27ca41SMauro Carvalho Chehab i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM; 114eea85b0aSRichard Röjfors i2cmsg[1] = (pll >> 8) & 0xff; 115eea85b0aSRichard Röjfors i2cmsg[2] = pll & 0xff; 116eea85b0aSRichard Röjfors 117eea85b0aSRichard Röjfors err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg)); 118bd93b3adSAxel Lin if (err != sizeof(i2cmsg)) 119bd93b3adSAxel Lin return err < 0 ? err : -EIO; 120bd93b3adSAxel Lin 121fa915996SHans Verkuil state->freq = freq; 122bd93b3adSAxel Lin return 0; 123eea85b0aSRichard Röjfors } 124eea85b0aSRichard Röjfors 125eea85b0aSRichard Röjfors static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 126eea85b0aSRichard Röjfors { 127eea85b0aSRichard Röjfors struct tef6862_state *state = to_state(sd); 128eea85b0aSRichard Röjfors 129eea85b0aSRichard Röjfors if (f->tuner != 0) 130eea85b0aSRichard Röjfors return -EINVAL; 131eea85b0aSRichard Röjfors f->type = V4L2_TUNER_RADIO; 132eea85b0aSRichard Röjfors f->frequency = state->freq; 133eea85b0aSRichard Röjfors return 0; 134eea85b0aSRichard Röjfors } 135eea85b0aSRichard Röjfors 136eea85b0aSRichard Röjfors static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 137eea85b0aSRichard Röjfors .g_tuner = tef6862_g_tuner, 138eea85b0aSRichard Röjfors .s_tuner = tef6862_s_tuner, 139eea85b0aSRichard Röjfors .s_frequency = tef6862_s_frequency, 140eea85b0aSRichard Röjfors .g_frequency = tef6862_g_frequency, 141eea85b0aSRichard Röjfors }; 142eea85b0aSRichard Röjfors 143eea85b0aSRichard Röjfors static const struct v4l2_subdev_ops tef6862_ops = { 144eea85b0aSRichard Röjfors .tuner = &tef6862_tuner_ops, 145eea85b0aSRichard Röjfors }; 146eea85b0aSRichard Röjfors 147eea85b0aSRichard Röjfors /* 148eea85b0aSRichard Röjfors * Generic i2c probe 149eea85b0aSRichard Röjfors * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 150eea85b0aSRichard Röjfors */ 151eea85b0aSRichard Röjfors 1524c62e976SGreg Kroah-Hartman static int tef6862_probe(struct i2c_client *client, 153eea85b0aSRichard Röjfors const struct i2c_device_id *id) 154eea85b0aSRichard Röjfors { 155eea85b0aSRichard Röjfors struct tef6862_state *state; 156eea85b0aSRichard Röjfors struct v4l2_subdev *sd; 157eea85b0aSRichard Röjfors 158eea85b0aSRichard Röjfors /* Check if the adapter supports the needed features */ 159eea85b0aSRichard Röjfors if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 160eea85b0aSRichard Röjfors return -EIO; 161eea85b0aSRichard Röjfors 162eea85b0aSRichard Röjfors v4l_info(client, "chip found @ 0x%02x (%s)\n", 163eea85b0aSRichard Röjfors client->addr << 1, client->adapter->name); 164eea85b0aSRichard Röjfors 16580845a33SHerton Ronaldo Krzesinski state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL); 166eea85b0aSRichard Röjfors if (state == NULL) 167eea85b0aSRichard Röjfors return -ENOMEM; 168eea85b0aSRichard Röjfors state->freq = TEF6862_LO_FREQ; 169eea85b0aSRichard Röjfors 170eea85b0aSRichard Röjfors sd = &state->sd; 171eea85b0aSRichard Röjfors v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 172eea85b0aSRichard Röjfors 173eea85b0aSRichard Röjfors return 0; 174eea85b0aSRichard Röjfors } 175eea85b0aSRichard Röjfors 1764c62e976SGreg Kroah-Hartman static int tef6862_remove(struct i2c_client *client) 177eea85b0aSRichard Röjfors { 178eea85b0aSRichard Röjfors struct v4l2_subdev *sd = i2c_get_clientdata(client); 179eea85b0aSRichard Röjfors 180eea85b0aSRichard Röjfors v4l2_device_unregister_subdev(sd); 181eea85b0aSRichard Röjfors kfree(to_state(sd)); 182eea85b0aSRichard Röjfors return 0; 183eea85b0aSRichard Röjfors } 184eea85b0aSRichard Röjfors 185eea85b0aSRichard Röjfors static const struct i2c_device_id tef6862_id[] = { 186eea85b0aSRichard Röjfors {DRIVER_NAME, 0}, 187eea85b0aSRichard Röjfors {}, 188eea85b0aSRichard Röjfors }; 189eea85b0aSRichard Röjfors 190eea85b0aSRichard Röjfors MODULE_DEVICE_TABLE(i2c, tef6862_id); 191eea85b0aSRichard Röjfors 192eea85b0aSRichard Röjfors static struct i2c_driver tef6862_driver = { 193eea85b0aSRichard Röjfors .driver = { 194eea85b0aSRichard Röjfors .name = DRIVER_NAME, 195eea85b0aSRichard Röjfors }, 196eea85b0aSRichard Röjfors .probe = tef6862_probe, 1974c62e976SGreg Kroah-Hartman .remove = tef6862_remove, 198eea85b0aSRichard Röjfors .id_table = tef6862_id, 199eea85b0aSRichard Röjfors }; 200eea85b0aSRichard Röjfors 201c6e8d86fSAxel Lin module_i2c_driver(tef6862_driver); 202eea85b0aSRichard Röjfors 203eea85b0aSRichard Röjfors MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 204eea85b0aSRichard Röjfors MODULE_AUTHOR("Mocean Laboratories"); 205eea85b0aSRichard Röjfors MODULE_LICENSE("GPL v2"); 206