1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Driver for Infineon tua6100 pll. |
4 | * |
5 | * (c) 2006 Andrew de Quincey |
6 | * |
7 | * Based on code found in budget-av.c, which has the following: |
8 | * Compiled from various sources by Michael Hunold <michael@mihu.de> |
9 | * |
10 | * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> & |
11 | * Andrew de Quincey <adq_dvb@lidskialf.net> |
12 | * |
13 | * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de> |
14 | * |
15 | * Copyright (C) 1999-2002 Ralph Metzler |
16 | * & Marcus Metzler for convergence integrated media GmbH |
17 | */ |
18 | |
19 | #include <linux/slab.h> |
20 | #include <linux/module.h> |
21 | #include <linux/dvb/frontend.h> |
22 | #include <asm/types.h> |
23 | |
24 | #include "tua6100.h" |
25 | |
26 | struct tua6100_priv { |
27 | /* i2c details */ |
28 | int i2c_address; |
29 | struct i2c_adapter *i2c; |
30 | u32 frequency; |
31 | }; |
32 | |
33 | static void tua6100_release(struct dvb_frontend *fe) |
34 | { |
35 | kfree(objp: fe->tuner_priv); |
36 | fe->tuner_priv = NULL; |
37 | } |
38 | |
39 | static int tua6100_sleep(struct dvb_frontend *fe) |
40 | { |
41 | struct tua6100_priv *priv = fe->tuner_priv; |
42 | int ret; |
43 | u8 reg0[] = { 0x00, 0x00 }; |
44 | struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; |
45 | |
46 | if (fe->ops.i2c_gate_ctrl) |
47 | fe->ops.i2c_gate_ctrl(fe, 1); |
48 | if ((ret = i2c_transfer (adap: priv->i2c, msgs: &msg, num: 1)) != 1) { |
49 | printk("%s: i2c error\n" , __func__); |
50 | } |
51 | if (fe->ops.i2c_gate_ctrl) |
52 | fe->ops.i2c_gate_ctrl(fe, 0); |
53 | |
54 | return (ret == 1) ? 0 : ret; |
55 | } |
56 | |
57 | static int tua6100_set_params(struct dvb_frontend *fe) |
58 | { |
59 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
60 | struct tua6100_priv *priv = fe->tuner_priv; |
61 | u32 div; |
62 | u32 prediv; |
63 | u8 reg0[] = { 0x00, 0x00 }; |
64 | u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 }; |
65 | u8 reg2[] = { 0x02, 0x00, 0x00 }; |
66 | struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; |
67 | struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 }; |
68 | struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 }; |
69 | |
70 | #define _R_VAL 4 |
71 | #define _P_VAL 32 |
72 | #define _ri 4000000 |
73 | |
74 | // setup register 0 |
75 | if (c->frequency < 2000000) |
76 | reg0[1] = 0x03; |
77 | else |
78 | reg0[1] = 0x07; |
79 | |
80 | // setup register 1 |
81 | if (c->frequency < 1630000) |
82 | reg1[1] = 0x2c; |
83 | else |
84 | reg1[1] = 0x0c; |
85 | |
86 | if (_P_VAL == 64) |
87 | reg1[1] |= 0x40; |
88 | if (c->frequency >= 1525000) |
89 | reg1[1] |= 0x80; |
90 | |
91 | // register 2 |
92 | reg2[1] = (_R_VAL >> 8) & 0x03; |
93 | reg2[2] = _R_VAL; |
94 | if (c->frequency < 1455000) |
95 | reg2[1] |= 0x1c; |
96 | else if (c->frequency < 1630000) |
97 | reg2[1] |= 0x0c; |
98 | else |
99 | reg2[1] |= 0x1c; |
100 | |
101 | /* |
102 | * The N divisor ratio (note: c->frequency is in kHz, but we |
103 | * need it in Hz) |
104 | */ |
105 | prediv = (c->frequency * _R_VAL) / (_ri / 1000); |
106 | div = prediv / _P_VAL; |
107 | reg1[1] |= (div >> 9) & 0x03; |
108 | reg1[2] = div >> 1; |
109 | reg1[3] = (div << 7); |
110 | priv->frequency = ((div * _P_VAL) * (_ri / 1000)) / _R_VAL; |
111 | |
112 | // Finally, calculate and store the value for A |
113 | reg1[3] |= (prediv - (div*_P_VAL)) & 0x7f; |
114 | |
115 | #undef _R_VAL |
116 | #undef _P_VAL |
117 | #undef _ri |
118 | |
119 | if (fe->ops.i2c_gate_ctrl) |
120 | fe->ops.i2c_gate_ctrl(fe, 1); |
121 | if (i2c_transfer(adap: priv->i2c, msgs: &msg0, num: 1) != 1) |
122 | return -EIO; |
123 | |
124 | if (fe->ops.i2c_gate_ctrl) |
125 | fe->ops.i2c_gate_ctrl(fe, 1); |
126 | if (i2c_transfer(adap: priv->i2c, msgs: &msg2, num: 1) != 1) |
127 | return -EIO; |
128 | |
129 | if (fe->ops.i2c_gate_ctrl) |
130 | fe->ops.i2c_gate_ctrl(fe, 1); |
131 | if (i2c_transfer(adap: priv->i2c, msgs: &msg1, num: 1) != 1) |
132 | return -EIO; |
133 | |
134 | if (fe->ops.i2c_gate_ctrl) |
135 | fe->ops.i2c_gate_ctrl(fe, 0); |
136 | |
137 | return 0; |
138 | } |
139 | |
140 | static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
141 | { |
142 | struct tua6100_priv *priv = fe->tuner_priv; |
143 | *frequency = priv->frequency; |
144 | return 0; |
145 | } |
146 | |
147 | static const struct dvb_tuner_ops tua6100_tuner_ops = { |
148 | .info = { |
149 | .name = "Infineon TUA6100" , |
150 | .frequency_min_hz = 950 * MHz, |
151 | .frequency_max_hz = 2150 * MHz, |
152 | .frequency_step_hz = 1 * MHz, |
153 | }, |
154 | .release = tua6100_release, |
155 | .sleep = tua6100_sleep, |
156 | .set_params = tua6100_set_params, |
157 | .get_frequency = tua6100_get_frequency, |
158 | }; |
159 | |
160 | struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c) |
161 | { |
162 | struct tua6100_priv *priv = NULL; |
163 | u8 b1 [] = { 0x80 }; |
164 | u8 b2 [] = { 0x00 }; |
165 | struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 }, |
166 | { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } }; |
167 | int ret; |
168 | |
169 | if (fe->ops.i2c_gate_ctrl) |
170 | fe->ops.i2c_gate_ctrl(fe, 1); |
171 | ret = i2c_transfer (adap: i2c, msgs: msg, num: 2); |
172 | if (fe->ops.i2c_gate_ctrl) |
173 | fe->ops.i2c_gate_ctrl(fe, 0); |
174 | |
175 | if (ret != 2) |
176 | return NULL; |
177 | |
178 | priv = kzalloc(size: sizeof(struct tua6100_priv), GFP_KERNEL); |
179 | if (priv == NULL) |
180 | return NULL; |
181 | |
182 | priv->i2c_address = addr; |
183 | priv->i2c = i2c; |
184 | |
185 | memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops)); |
186 | fe->tuner_priv = priv; |
187 | return fe; |
188 | } |
189 | EXPORT_SYMBOL_GPL(tua6100_attach); |
190 | |
191 | MODULE_DESCRIPTION("DVB tua6100 driver" ); |
192 | MODULE_AUTHOR("Andrew de Quincey" ); |
193 | MODULE_LICENSE("GPL" ); |
194 | |