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 29 #define DRIVER_NAME "tef6862" 30 31 #define FREQ_MUL 16000 32 33 #define TEF6862_LO_FREQ (875 * FREQ_MUL / 10) 34 #define TEF6862_HI_FREQ (108 * FREQ_MUL) 35 36 /* Write mode sub addresses */ 37 #define WM_SUB_BANDWIDTH 0x0 38 #define WM_SUB_PLLM 0x1 39 #define WM_SUB_PLLL 0x2 40 #define WM_SUB_DAA 0x3 41 #define WM_SUB_AGC 0x4 42 #define WM_SUB_BAND 0x5 43 #define WM_SUB_CONTROL 0x6 44 #define WM_SUB_LEVEL 0x7 45 #define WM_SUB_IFCF 0x8 46 #define WM_SUB_IFCAP 0x9 47 #define WM_SUB_ACD 0xA 48 #define WM_SUB_TEST 0xF 49 50 /* Different modes of the MSA register */ 51 #define MODE_BUFFER 0x0 52 #define MODE_PRESET 0x1 53 #define MODE_SEARCH 0x2 54 #define MODE_AF_UPDATE 0x3 55 #define MODE_JUMP 0x4 56 #define MODE_CHECK 0x5 57 #define MODE_LOAD 0x6 58 #define MODE_END 0x7 59 #define MODE_SHIFT 5 60 61 struct tef6862_state { 62 struct v4l2_subdev sd; 63 unsigned long freq; 64 }; 65 66 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd) 67 { 68 return container_of(sd, struct tef6862_state, sd); 69 } 70 71 static u16 tef6862_sigstr(struct i2c_client *client) 72 { 73 u8 buf[4]; 74 int err = i2c_master_recv(client, buf, sizeof(buf)); 75 if (err == sizeof(buf)) 76 return buf[3] << 8; 77 return 0; 78 } 79 80 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) 81 { 82 if (v->index > 0) 83 return -EINVAL; 84 85 /* only support FM for now */ 86 strlcpy(v->name, "FM", sizeof(v->name)); 87 v->type = V4L2_TUNER_RADIO; 88 v->rangelow = TEF6862_LO_FREQ; 89 v->rangehigh = TEF6862_HI_FREQ; 90 v->rxsubchans = V4L2_TUNER_SUB_MONO; 91 v->capability = V4L2_TUNER_CAP_LOW; 92 v->audmode = V4L2_TUNER_MODE_STEREO; 93 v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd)); 94 95 return 0; 96 } 97 98 static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v) 99 { 100 return v->index ? -EINVAL : 0; 101 } 102 103 static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f) 104 { 105 struct tef6862_state *state = to_state(sd); 106 struct i2c_client *client = v4l2_get_subdevdata(sd); 107 u16 pll; 108 u8 i2cmsg[3]; 109 int err; 110 111 if (f->tuner != 0) 112 return -EINVAL; 113 114 pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL; 115 i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM; 116 i2cmsg[1] = (pll >> 8) & 0xff; 117 i2cmsg[2] = pll & 0xff; 118 119 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg)); 120 if (err != sizeof(i2cmsg)) 121 return err < 0 ? err : -EIO; 122 123 state->freq = f->frequency; 124 return 0; 125 } 126 127 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 128 { 129 struct tef6862_state *state = to_state(sd); 130 131 if (f->tuner != 0) 132 return -EINVAL; 133 f->type = V4L2_TUNER_RADIO; 134 f->frequency = state->freq; 135 return 0; 136 } 137 138 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 139 .g_tuner = tef6862_g_tuner, 140 .s_tuner = tef6862_s_tuner, 141 .s_frequency = tef6862_s_frequency, 142 .g_frequency = tef6862_g_frequency, 143 }; 144 145 static const struct v4l2_subdev_ops tef6862_ops = { 146 .tuner = &tef6862_tuner_ops, 147 }; 148 149 /* 150 * Generic i2c probe 151 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 152 */ 153 154 static int tef6862_probe(struct i2c_client *client, 155 const struct i2c_device_id *id) 156 { 157 struct tef6862_state *state; 158 struct v4l2_subdev *sd; 159 160 /* Check if the adapter supports the needed features */ 161 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 162 return -EIO; 163 164 v4l_info(client, "chip found @ 0x%02x (%s)\n", 165 client->addr << 1, client->adapter->name); 166 167 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL); 168 if (state == NULL) 169 return -ENOMEM; 170 state->freq = TEF6862_LO_FREQ; 171 172 sd = &state->sd; 173 v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 174 175 return 0; 176 } 177 178 static int tef6862_remove(struct i2c_client *client) 179 { 180 struct v4l2_subdev *sd = i2c_get_clientdata(client); 181 182 v4l2_device_unregister_subdev(sd); 183 kfree(to_state(sd)); 184 return 0; 185 } 186 187 static const struct i2c_device_id tef6862_id[] = { 188 {DRIVER_NAME, 0}, 189 {}, 190 }; 191 192 MODULE_DEVICE_TABLE(i2c, tef6862_id); 193 194 static struct i2c_driver tef6862_driver = { 195 .driver = { 196 .owner = THIS_MODULE, 197 .name = DRIVER_NAME, 198 }, 199 .probe = tef6862_probe, 200 .remove = tef6862_remove, 201 .id_table = tef6862_id, 202 }; 203 204 module_i2c_driver(tef6862_driver); 205 206 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 207 MODULE_AUTHOR("Mocean Laboratories"); 208 MODULE_LICENSE("GPL v2"); 209