1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | Driver for Philips tda8262/tda8263 DVBS Silicon tuners |
4 | |
5 | (c) 2006 Andrew de Quincey |
6 | |
7 | |
8 | */ |
9 | |
10 | #include <linux/slab.h> |
11 | #include <linux/module.h> |
12 | #include <linux/dvb/frontend.h> |
13 | #include <asm/types.h> |
14 | |
15 | #include "tda826x.h" |
16 | |
17 | static int debug; |
18 | #define dprintk(args...) \ |
19 | do { \ |
20 | if (debug) printk(KERN_DEBUG "tda826x: " args); \ |
21 | } while (0) |
22 | |
23 | struct tda826x_priv { |
24 | /* i2c details */ |
25 | int i2c_address; |
26 | struct i2c_adapter *i2c; |
27 | u8 has_loopthrough:1; |
28 | u32 frequency; |
29 | }; |
30 | |
31 | static void tda826x_release(struct dvb_frontend *fe) |
32 | { |
33 | kfree(objp: fe->tuner_priv); |
34 | fe->tuner_priv = NULL; |
35 | } |
36 | |
37 | static int tda826x_sleep(struct dvb_frontend *fe) |
38 | { |
39 | struct tda826x_priv *priv = fe->tuner_priv; |
40 | int ret; |
41 | u8 buf [] = { 0x00, 0x8d }; |
42 | struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 }; |
43 | |
44 | dprintk("%s:\n" , __func__); |
45 | |
46 | if (!priv->has_loopthrough) |
47 | buf[1] = 0xad; |
48 | |
49 | if (fe->ops.i2c_gate_ctrl) |
50 | fe->ops.i2c_gate_ctrl(fe, 1); |
51 | if ((ret = i2c_transfer (adap: priv->i2c, msgs: &msg, num: 1)) != 1) { |
52 | dprintk("%s: i2c error\n" , __func__); |
53 | } |
54 | if (fe->ops.i2c_gate_ctrl) |
55 | fe->ops.i2c_gate_ctrl(fe, 0); |
56 | |
57 | return (ret == 1) ? 0 : ret; |
58 | } |
59 | |
60 | static int tda826x_set_params(struct dvb_frontend *fe) |
61 | { |
62 | struct dtv_frontend_properties *p = &fe->dtv_property_cache; |
63 | struct tda826x_priv *priv = fe->tuner_priv; |
64 | int ret; |
65 | u32 div; |
66 | u32 ksyms; |
67 | u32 bandwidth; |
68 | u8 buf [11]; |
69 | struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 }; |
70 | |
71 | dprintk("%s:\n" , __func__); |
72 | |
73 | div = (p->frequency + (1000-1)) / 1000; |
74 | |
75 | /* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */ |
76 | /* with R0 = 0.35 and some transformations: */ |
77 | ksyms = p->symbol_rate / 1000; |
78 | bandwidth = (878 * ksyms + 6500000) / 1000000 + 1; |
79 | if (bandwidth < 5) |
80 | bandwidth = 5; |
81 | else if (bandwidth > 36) |
82 | bandwidth = 36; |
83 | |
84 | buf[0] = 0x00; // subaddress |
85 | buf[1] = 0x09; // powerdown RSSI + the magic value 1 |
86 | if (!priv->has_loopthrough) |
87 | buf[1] |= 0x20; // power down loopthrough if not needed |
88 | buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO |
89 | buf[3] = div >> 7; |
90 | buf[4] = div << 1; |
91 | buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */ |
92 | buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation |
93 | buf[7] = 0x83; // charge pumps at high, tests off |
94 | buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports. |
95 | buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL |
96 | buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on |
97 | |
98 | if (fe->ops.i2c_gate_ctrl) |
99 | fe->ops.i2c_gate_ctrl(fe, 1); |
100 | if ((ret = i2c_transfer (adap: priv->i2c, msgs: &msg, num: 1)) != 1) { |
101 | dprintk("%s: i2c error\n" , __func__); |
102 | } |
103 | if (fe->ops.i2c_gate_ctrl) |
104 | fe->ops.i2c_gate_ctrl(fe, 0); |
105 | |
106 | priv->frequency = div * 1000; |
107 | |
108 | return (ret == 1) ? 0 : ret; |
109 | } |
110 | |
111 | static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
112 | { |
113 | struct tda826x_priv *priv = fe->tuner_priv; |
114 | *frequency = priv->frequency; |
115 | return 0; |
116 | } |
117 | |
118 | static const struct dvb_tuner_ops tda826x_tuner_ops = { |
119 | .info = { |
120 | .name = "Philips TDA826X" , |
121 | .frequency_min_hz = 950 * MHz, |
122 | .frequency_max_hz = 2175 * MHz |
123 | }, |
124 | .release = tda826x_release, |
125 | .sleep = tda826x_sleep, |
126 | .set_params = tda826x_set_params, |
127 | .get_frequency = tda826x_get_frequency, |
128 | }; |
129 | |
130 | struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough) |
131 | { |
132 | struct tda826x_priv *priv = NULL; |
133 | u8 b1 [] = { 0, 0 }; |
134 | struct i2c_msg msg[2] = { |
135 | { .addr = addr, .flags = 0, .buf = NULL, .len = 0 }, |
136 | { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 } |
137 | }; |
138 | int ret; |
139 | |
140 | dprintk("%s:\n" , __func__); |
141 | |
142 | if (fe->ops.i2c_gate_ctrl) |
143 | fe->ops.i2c_gate_ctrl(fe, 1); |
144 | ret = i2c_transfer (adap: i2c, msgs: msg, num: 2); |
145 | if (fe->ops.i2c_gate_ctrl) |
146 | fe->ops.i2c_gate_ctrl(fe, 0); |
147 | |
148 | if (ret != 2) |
149 | return NULL; |
150 | if (!(b1[1] & 0x80)) |
151 | return NULL; |
152 | |
153 | priv = kzalloc(size: sizeof(struct tda826x_priv), GFP_KERNEL); |
154 | if (priv == NULL) |
155 | return NULL; |
156 | |
157 | priv->i2c_address = addr; |
158 | priv->i2c = i2c; |
159 | priv->has_loopthrough = has_loopthrough; |
160 | |
161 | memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops)); |
162 | |
163 | fe->tuner_priv = priv; |
164 | |
165 | return fe; |
166 | } |
167 | EXPORT_SYMBOL_GPL(tda826x_attach); |
168 | |
169 | module_param(debug, int, 0644); |
170 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)." ); |
171 | |
172 | MODULE_DESCRIPTION("DVB TDA826x driver" ); |
173 | MODULE_AUTHOR("Andrew de Quincey" ); |
174 | MODULE_LICENSE("GPL" ); |
175 | |