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 (875U * FREQ_MUL / 10) 34 #define TEF6862_HI_FREQ (108U * 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 MSA_MODE_BUFFER 0x0 52 #define MSA_MODE_PRESET 0x1 53 #define MSA_MODE_SEARCH 0x2 54 #define MSA_MODE_AF_UPDATE 0x3 55 #define MSA_MODE_JUMP 0x4 56 #define MSA_MODE_CHECK 0x5 57 #define MSA_MODE_LOAD 0x6 58 #define MSA_MODE_END 0x7 59 #define MSA_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 unsigned freq = f->frequency; 108 u16 pll; 109 u8 i2cmsg[3]; 110 int err; 111 112 if (f->tuner != 0) 113 return -EINVAL; 114 115 freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ); 116 pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL; 117 i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM; 118 i2cmsg[1] = (pll >> 8) & 0xff; 119 i2cmsg[2] = pll & 0xff; 120 121 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg)); 122 if (err != sizeof(i2cmsg)) 123 return err < 0 ? err : -EIO; 124 125 state->freq = freq; 126 return 0; 127 } 128 129 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 130 { 131 struct tef6862_state *state = to_state(sd); 132 133 if (f->tuner != 0) 134 return -EINVAL; 135 f->type = V4L2_TUNER_RADIO; 136 f->frequency = state->freq; 137 return 0; 138 } 139 140 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 141 .g_tuner = tef6862_g_tuner, 142 .s_tuner = tef6862_s_tuner, 143 .s_frequency = tef6862_s_frequency, 144 .g_frequency = tef6862_g_frequency, 145 }; 146 147 static const struct v4l2_subdev_ops tef6862_ops = { 148 .tuner = &tef6862_tuner_ops, 149 }; 150 151 /* 152 * Generic i2c probe 153 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 154 */ 155 156 static int tef6862_probe(struct i2c_client *client, 157 const struct i2c_device_id *id) 158 { 159 struct tef6862_state *state; 160 struct v4l2_subdev *sd; 161 162 /* Check if the adapter supports the needed features */ 163 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 164 return -EIO; 165 166 v4l_info(client, "chip found @ 0x%02x (%s)\n", 167 client->addr << 1, client->adapter->name); 168 169 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL); 170 if (state == NULL) 171 return -ENOMEM; 172 state->freq = TEF6862_LO_FREQ; 173 174 sd = &state->sd; 175 v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 176 177 return 0; 178 } 179 180 static int tef6862_remove(struct i2c_client *client) 181 { 182 struct v4l2_subdev *sd = i2c_get_clientdata(client); 183 184 v4l2_device_unregister_subdev(sd); 185 kfree(to_state(sd)); 186 return 0; 187 } 188 189 static const struct i2c_device_id tef6862_id[] = { 190 {DRIVER_NAME, 0}, 191 {}, 192 }; 193 194 MODULE_DEVICE_TABLE(i2c, tef6862_id); 195 196 static struct i2c_driver tef6862_driver = { 197 .driver = { 198 .name = DRIVER_NAME, 199 }, 200 .probe = tef6862_probe, 201 .remove = tef6862_remove, 202 .id_table = tef6862_id, 203 }; 204 205 module_i2c_driver(tef6862_driver); 206 207 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 208 MODULE_AUTHOR("Mocean Laboratories"); 209 MODULE_LICENSE("GPL v2"); 210