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/slab.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 != sizeof(i2cmsg)) 122 return err < 0 ? err : -EIO; 123 124 state->freq = f->frequency; 125 return 0; 126 } 127 128 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 129 { 130 struct tef6862_state *state = to_state(sd); 131 132 if (f->tuner != 0) 133 return -EINVAL; 134 f->type = V4L2_TUNER_RADIO; 135 f->frequency = state->freq; 136 return 0; 137 } 138 139 static int tef6862_g_chip_ident(struct v4l2_subdev *sd, 140 struct v4l2_dbg_chip_ident *chip) 141 { 142 struct i2c_client *client = v4l2_get_subdevdata(sd); 143 144 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0); 145 } 146 147 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 148 .g_tuner = tef6862_g_tuner, 149 .s_tuner = tef6862_s_tuner, 150 .s_frequency = tef6862_s_frequency, 151 .g_frequency = tef6862_g_frequency, 152 }; 153 154 static const struct v4l2_subdev_core_ops tef6862_core_ops = { 155 .g_chip_ident = tef6862_g_chip_ident, 156 }; 157 158 static const struct v4l2_subdev_ops tef6862_ops = { 159 .core = &tef6862_core_ops, 160 .tuner = &tef6862_tuner_ops, 161 }; 162 163 /* 164 * Generic i2c probe 165 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 166 */ 167 168 static int tef6862_probe(struct i2c_client *client, 169 const struct i2c_device_id *id) 170 { 171 struct tef6862_state *state; 172 struct v4l2_subdev *sd; 173 174 /* Check if the adapter supports the needed features */ 175 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 176 return -EIO; 177 178 v4l_info(client, "chip found @ 0x%02x (%s)\n", 179 client->addr << 1, client->adapter->name); 180 181 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL); 182 if (state == NULL) 183 return -ENOMEM; 184 state->freq = TEF6862_LO_FREQ; 185 186 sd = &state->sd; 187 v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 188 189 return 0; 190 } 191 192 static int tef6862_remove(struct i2c_client *client) 193 { 194 struct v4l2_subdev *sd = i2c_get_clientdata(client); 195 196 v4l2_device_unregister_subdev(sd); 197 kfree(to_state(sd)); 198 return 0; 199 } 200 201 static const struct i2c_device_id tef6862_id[] = { 202 {DRIVER_NAME, 0}, 203 {}, 204 }; 205 206 MODULE_DEVICE_TABLE(i2c, tef6862_id); 207 208 static struct i2c_driver tef6862_driver = { 209 .driver = { 210 .owner = THIS_MODULE, 211 .name = DRIVER_NAME, 212 }, 213 .probe = tef6862_probe, 214 .remove = tef6862_remove, 215 .id_table = tef6862_id, 216 }; 217 218 module_i2c_driver(tef6862_driver); 219 220 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 221 MODULE_AUTHOR("Mocean Laboratories"); 222 MODULE_LICENSE("GPL v2"); 223