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 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/errno.h> 22 #include <linux/kernel.h> 23 #include <linux/interrupt.h> 24 #include <linux/i2c.h> 25 #include <linux/i2c-id.h> 26 #include <media/v4l2-ioctl.h> 27 #include <media/v4l2-device.h> 28 #include <media/v4l2-chip-ident.h> 29 30 #define DRIVER_NAME "tef6862" 31 32 #define FREQ_MUL 16000 33 34 #define TEF6862_LO_FREQ (875 * FREQ_MUL / 10) 35 #define TEF6862_HI_FREQ (108 * FREQ_MUL) 36 37 /* Write mode sub addresses */ 38 #define WM_SUB_BANDWIDTH 0x0 39 #define WM_SUB_PLLM 0x1 40 #define WM_SUB_PLLL 0x2 41 #define WM_SUB_DAA 0x3 42 #define WM_SUB_AGC 0x4 43 #define WM_SUB_BAND 0x5 44 #define WM_SUB_CONTROL 0x6 45 #define WM_SUB_LEVEL 0x7 46 #define WM_SUB_IFCF 0x8 47 #define WM_SUB_IFCAP 0x9 48 #define WM_SUB_ACD 0xA 49 #define WM_SUB_TEST 0xF 50 51 /* Different modes of the MSA register */ 52 #define MODE_BUFFER 0x0 53 #define MODE_PRESET 0x1 54 #define MODE_SEARCH 0x2 55 #define MODE_AF_UPDATE 0x3 56 #define MODE_JUMP 0x4 57 #define MODE_CHECK 0x5 58 #define MODE_LOAD 0x6 59 #define MODE_END 0x7 60 #define MODE_SHIFT 5 61 62 struct tef6862_state { 63 struct v4l2_subdev sd; 64 unsigned long freq; 65 }; 66 67 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd) 68 { 69 return container_of(sd, struct tef6862_state, sd); 70 } 71 72 static u16 tef6862_sigstr(struct i2c_client *client) 73 { 74 u8 buf[4]; 75 int err = i2c_master_recv(client, buf, sizeof(buf)); 76 if (err == sizeof(buf)) 77 return buf[3] << 8; 78 return 0; 79 } 80 81 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) 82 { 83 if (v->index > 0) 84 return -EINVAL; 85 86 /* only support FM for now */ 87 strlcpy(v->name, "FM", sizeof(v->name)); 88 v->type = V4L2_TUNER_RADIO; 89 v->rangelow = TEF6862_LO_FREQ; 90 v->rangehigh = TEF6862_HI_FREQ; 91 v->rxsubchans = V4L2_TUNER_SUB_MONO; 92 v->capability = V4L2_TUNER_CAP_LOW; 93 v->audmode = V4L2_TUNER_MODE_STEREO; 94 v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd)); 95 96 return 0; 97 } 98 99 static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) 100 { 101 return v->index ? -EINVAL : 0; 102 } 103 104 static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 105 { 106 struct tef6862_state *state = to_state(sd); 107 struct i2c_client *client = v4l2_get_subdevdata(sd); 108 u16 pll; 109 u8 i2cmsg[3]; 110 int err; 111 112 if (f->tuner != 0) 113 return -EINVAL; 114 115 pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL; 116 i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM; 117 i2cmsg[1] = (pll >> 8) & 0xff; 118 i2cmsg[2] = pll & 0xff; 119 120 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg)); 121 if (!err) 122 state->freq = f->frequency; 123 return err; 124 } 125 126 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 127 { 128 struct tef6862_state *state = to_state(sd); 129 130 if (f->tuner != 0) 131 return -EINVAL; 132 f->type = V4L2_TUNER_RADIO; 133 f->frequency = state->freq; 134 return 0; 135 } 136 137 static int tef6862_g_chip_ident(struct v4l2_subdev *sd, 138 struct v4l2_dbg_chip_ident *chip) 139 { 140 struct i2c_client *client = v4l2_get_subdevdata(sd); 141 142 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0); 143 } 144 145 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 146 .g_tuner = tef6862_g_tuner, 147 .s_tuner = tef6862_s_tuner, 148 .s_frequency = tef6862_s_frequency, 149 .g_frequency = tef6862_g_frequency, 150 }; 151 152 static const struct v4l2_subdev_core_ops tef6862_core_ops = { 153 .g_chip_ident = tef6862_g_chip_ident, 154 }; 155 156 static const struct v4l2_subdev_ops tef6862_ops = { 157 .core = &tef6862_core_ops, 158 .tuner = &tef6862_tuner_ops, 159 }; 160 161 /* 162 * Generic i2c probe 163 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 164 */ 165 166 static int __devinit tef6862_probe(struct i2c_client *client, 167 const struct i2c_device_id *id) 168 { 169 struct tef6862_state *state; 170 struct v4l2_subdev *sd; 171 172 /* Check if the adapter supports the needed features */ 173 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 174 return -EIO; 175 176 v4l_info(client, "chip found @ 0x%02x (%s)\n", 177 client->addr << 1, client->adapter->name); 178 179 state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL); 180 if (state == NULL) 181 return -ENOMEM; 182 state->freq = TEF6862_LO_FREQ; 183 184 sd = &state->sd; 185 v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 186 187 return 0; 188 } 189 190 static int __devexit tef6862_remove(struct i2c_client *client) 191 { 192 struct v4l2_subdev *sd = i2c_get_clientdata(client); 193 194 v4l2_device_unregister_subdev(sd); 195 kfree(to_state(sd)); 196 return 0; 197 } 198 199 static const struct i2c_device_id tef6862_id[] = { 200 {DRIVER_NAME, 0}, 201 {}, 202 }; 203 204 MODULE_DEVICE_TABLE(i2c, tef6862_id); 205 206 static struct i2c_driver tef6862_driver = { 207 .driver = { 208 .owner = THIS_MODULE, 209 .name = DRIVER_NAME, 210 }, 211 .probe = tef6862_probe, 212 .remove = tef6862_remove, 213 .id_table = tef6862_id, 214 }; 215 216 static __init int tef6862_init(void) 217 { 218 return i2c_add_driver(&tef6862_driver); 219 } 220 221 static __exit void tef6862_exit(void) 222 { 223 i2c_del_driver(&tef6862_driver); 224 } 225 226 module_init(tef6862_init); 227 module_exit(tef6862_exit); 228 229 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 230 MODULE_AUTHOR("Mocean Laboratories"); 231 MODULE_LICENSE("GPL v2"); 232 233