1 /* 2 * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner 3 * Copyright (c) 2009 Intel Corporation 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/errno.h> 18 #include <linux/kernel.h> 19 #include <linux/interrupt.h> 20 #include <linux/i2c.h> 21 #include <linux/slab.h> 22 #include <media/v4l2-ioctl.h> 23 #include <media/v4l2-device.h> 24 25 #define DRIVER_NAME "tef6862" 26 27 #define FREQ_MUL 16000 28 29 #define TEF6862_LO_FREQ (875U * FREQ_MUL / 10) 30 #define TEF6862_HI_FREQ (108U * FREQ_MUL) 31 32 /* Write mode sub addresses */ 33 #define WM_SUB_BANDWIDTH 0x0 34 #define WM_SUB_PLLM 0x1 35 #define WM_SUB_PLLL 0x2 36 #define WM_SUB_DAA 0x3 37 #define WM_SUB_AGC 0x4 38 #define WM_SUB_BAND 0x5 39 #define WM_SUB_CONTROL 0x6 40 #define WM_SUB_LEVEL 0x7 41 #define WM_SUB_IFCF 0x8 42 #define WM_SUB_IFCAP 0x9 43 #define WM_SUB_ACD 0xA 44 #define WM_SUB_TEST 0xF 45 46 /* Different modes of the MSA register */ 47 #define MSA_MODE_BUFFER 0x0 48 #define MSA_MODE_PRESET 0x1 49 #define MSA_MODE_SEARCH 0x2 50 #define MSA_MODE_AF_UPDATE 0x3 51 #define MSA_MODE_JUMP 0x4 52 #define MSA_MODE_CHECK 0x5 53 #define MSA_MODE_LOAD 0x6 54 #define MSA_MODE_END 0x7 55 #define MSA_MODE_SHIFT 5 56 57 struct tef6862_state { 58 struct v4l2_subdev sd; 59 unsigned long freq; 60 }; 61 62 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd) 63 { 64 return container_of(sd, struct tef6862_state, sd); 65 } 66 67 static u16 tef6862_sigstr(struct i2c_client *client) 68 { 69 u8 buf[4]; 70 int err = i2c_master_recv(client, buf, sizeof(buf)); 71 if (err == sizeof(buf)) 72 return buf[3] << 8; 73 return 0; 74 } 75 76 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) 77 { 78 if (v->index > 0) 79 return -EINVAL; 80 81 /* only support FM for now */ 82 strlcpy(v->name, "FM", sizeof(v->name)); 83 v->type = V4L2_TUNER_RADIO; 84 v->rangelow = TEF6862_LO_FREQ; 85 v->rangehigh = TEF6862_HI_FREQ; 86 v->rxsubchans = V4L2_TUNER_SUB_MONO; 87 v->capability = V4L2_TUNER_CAP_LOW; 88 v->audmode = V4L2_TUNER_MODE_STEREO; 89 v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd)); 90 91 return 0; 92 } 93 94 static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v) 95 { 96 return v->index ? -EINVAL : 0; 97 } 98 99 static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f) 100 { 101 struct tef6862_state *state = to_state(sd); 102 struct i2c_client *client = v4l2_get_subdevdata(sd); 103 unsigned freq = f->frequency; 104 u16 pll; 105 u8 i2cmsg[3]; 106 int err; 107 108 if (f->tuner != 0) 109 return -EINVAL; 110 111 freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ); 112 pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL; 113 i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM; 114 i2cmsg[1] = (pll >> 8) & 0xff; 115 i2cmsg[2] = pll & 0xff; 116 117 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg)); 118 if (err != sizeof(i2cmsg)) 119 return err < 0 ? err : -EIO; 120 121 state->freq = freq; 122 return 0; 123 } 124 125 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 126 { 127 struct tef6862_state *state = to_state(sd); 128 129 if (f->tuner != 0) 130 return -EINVAL; 131 f->type = V4L2_TUNER_RADIO; 132 f->frequency = state->freq; 133 return 0; 134 } 135 136 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 137 .g_tuner = tef6862_g_tuner, 138 .s_tuner = tef6862_s_tuner, 139 .s_frequency = tef6862_s_frequency, 140 .g_frequency = tef6862_g_frequency, 141 }; 142 143 static const struct v4l2_subdev_ops tef6862_ops = { 144 .tuner = &tef6862_tuner_ops, 145 }; 146 147 /* 148 * Generic i2c probe 149 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 150 */ 151 152 static int tef6862_probe(struct i2c_client *client, 153 const struct i2c_device_id *id) 154 { 155 struct tef6862_state *state; 156 struct v4l2_subdev *sd; 157 158 /* Check if the adapter supports the needed features */ 159 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 160 return -EIO; 161 162 v4l_info(client, "chip found @ 0x%02x (%s)\n", 163 client->addr << 1, client->adapter->name); 164 165 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL); 166 if (state == NULL) 167 return -ENOMEM; 168 state->freq = TEF6862_LO_FREQ; 169 170 sd = &state->sd; 171 v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 172 173 return 0; 174 } 175 176 static int tef6862_remove(struct i2c_client *client) 177 { 178 struct v4l2_subdev *sd = i2c_get_clientdata(client); 179 180 v4l2_device_unregister_subdev(sd); 181 kfree(to_state(sd)); 182 return 0; 183 } 184 185 static const struct i2c_device_id tef6862_id[] = { 186 {DRIVER_NAME, 0}, 187 {}, 188 }; 189 190 MODULE_DEVICE_TABLE(i2c, tef6862_id); 191 192 static struct i2c_driver tef6862_driver = { 193 .driver = { 194 .name = DRIVER_NAME, 195 }, 196 .probe = tef6862_probe, 197 .remove = tef6862_remove, 198 .id_table = tef6862_id, 199 }; 200 201 module_i2c_driver(tef6862_driver); 202 203 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 204 MODULE_AUTHOR("Mocean Laboratories"); 205 MODULE_LICENSE("GPL v2"); 206