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