1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner 4 * Copyright (c) 2009 Intel Corporation 5 */ 6 7 #include <linux/module.h> 8 #include <linux/init.h> 9 #include <linux/errno.h> 10 #include <linux/kernel.h> 11 #include <linux/interrupt.h> 12 #include <linux/i2c.h> 13 #include <linux/slab.h> 14 #include <media/v4l2-ioctl.h> 15 #include <media/v4l2-device.h> 16 17 #define DRIVER_NAME "tef6862" 18 19 #define FREQ_MUL 16000 20 21 #define TEF6862_LO_FREQ (875U * FREQ_MUL / 10) 22 #define TEF6862_HI_FREQ (108U * FREQ_MUL) 23 24 /* Write mode sub addresses */ 25 #define WM_SUB_BANDWIDTH 0x0 26 #define WM_SUB_PLLM 0x1 27 #define WM_SUB_PLLL 0x2 28 #define WM_SUB_DAA 0x3 29 #define WM_SUB_AGC 0x4 30 #define WM_SUB_BAND 0x5 31 #define WM_SUB_CONTROL 0x6 32 #define WM_SUB_LEVEL 0x7 33 #define WM_SUB_IFCF 0x8 34 #define WM_SUB_IFCAP 0x9 35 #define WM_SUB_ACD 0xA 36 #define WM_SUB_TEST 0xF 37 38 /* Different modes of the MSA register */ 39 #define MSA_MODE_BUFFER 0x0 40 #define MSA_MODE_PRESET 0x1 41 #define MSA_MODE_SEARCH 0x2 42 #define MSA_MODE_AF_UPDATE 0x3 43 #define MSA_MODE_JUMP 0x4 44 #define MSA_MODE_CHECK 0x5 45 #define MSA_MODE_LOAD 0x6 46 #define MSA_MODE_END 0x7 47 #define MSA_MODE_SHIFT 5 48 49 struct tef6862_state { 50 struct v4l2_subdev sd; 51 unsigned long freq; 52 }; 53 54 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd) 55 { 56 return container_of(sd, struct tef6862_state, sd); 57 } 58 59 static u16 tef6862_sigstr(struct i2c_client *client) 60 { 61 u8 buf[4]; 62 int err = i2c_master_recv(client, buf, sizeof(buf)); 63 if (err == sizeof(buf)) 64 return buf[3] << 8; 65 return 0; 66 } 67 68 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) 69 { 70 if (v->index > 0) 71 return -EINVAL; 72 73 /* only support FM for now */ 74 strscpy(v->name, "FM", sizeof(v->name)); 75 v->type = V4L2_TUNER_RADIO; 76 v->rangelow = TEF6862_LO_FREQ; 77 v->rangehigh = TEF6862_HI_FREQ; 78 v->rxsubchans = V4L2_TUNER_SUB_MONO; 79 v->capability = V4L2_TUNER_CAP_LOW; 80 v->audmode = V4L2_TUNER_MODE_STEREO; 81 v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd)); 82 83 return 0; 84 } 85 86 static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v) 87 { 88 return v->index ? -EINVAL : 0; 89 } 90 91 static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f) 92 { 93 struct tef6862_state *state = to_state(sd); 94 struct i2c_client *client = v4l2_get_subdevdata(sd); 95 unsigned freq = f->frequency; 96 u16 pll; 97 u8 i2cmsg[3]; 98 int err; 99 100 if (f->tuner != 0) 101 return -EINVAL; 102 103 freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ); 104 pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL; 105 i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM; 106 i2cmsg[1] = (pll >> 8) & 0xff; 107 i2cmsg[2] = pll & 0xff; 108 109 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg)); 110 if (err != sizeof(i2cmsg)) 111 return err < 0 ? err : -EIO; 112 113 state->freq = freq; 114 return 0; 115 } 116 117 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f) 118 { 119 struct tef6862_state *state = to_state(sd); 120 121 if (f->tuner != 0) 122 return -EINVAL; 123 f->type = V4L2_TUNER_RADIO; 124 f->frequency = state->freq; 125 return 0; 126 } 127 128 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = { 129 .g_tuner = tef6862_g_tuner, 130 .s_tuner = tef6862_s_tuner, 131 .s_frequency = tef6862_s_frequency, 132 .g_frequency = tef6862_g_frequency, 133 }; 134 135 static const struct v4l2_subdev_ops tef6862_ops = { 136 .tuner = &tef6862_tuner_ops, 137 }; 138 139 /* 140 * Generic i2c probe 141 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 142 */ 143 144 static int tef6862_probe(struct i2c_client *client) 145 { 146 struct tef6862_state *state; 147 struct v4l2_subdev *sd; 148 149 /* Check if the adapter supports the needed features */ 150 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 151 return -EIO; 152 153 v4l_info(client, "chip found @ 0x%02x (%s)\n", 154 client->addr << 1, client->adapter->name); 155 156 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL); 157 if (state == NULL) 158 return -ENOMEM; 159 state->freq = TEF6862_LO_FREQ; 160 161 sd = &state->sd; 162 v4l2_i2c_subdev_init(sd, client, &tef6862_ops); 163 164 return 0; 165 } 166 167 static void tef6862_remove(struct i2c_client *client) 168 { 169 struct v4l2_subdev *sd = i2c_get_clientdata(client); 170 171 v4l2_device_unregister_subdev(sd); 172 kfree(to_state(sd)); 173 } 174 175 static const struct i2c_device_id tef6862_id[] = { 176 {DRIVER_NAME, 0}, 177 {}, 178 }; 179 180 MODULE_DEVICE_TABLE(i2c, tef6862_id); 181 182 static struct i2c_driver tef6862_driver = { 183 .driver = { 184 .name = DRIVER_NAME, 185 }, 186 .probe = tef6862_probe, 187 .remove = tef6862_remove, 188 .id_table = tef6862_id, 189 }; 190 191 module_i2c_driver(tef6862_driver); 192 193 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner"); 194 MODULE_AUTHOR("Mocean Laboratories"); 195 MODULE_LICENSE("GPL v2"); 196