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
tua6100_release(struct dvb_frontend * fe)33 static void tua6100_release(struct dvb_frontend *fe)
34 {
35 kfree(fe->tuner_priv);
36 fe->tuner_priv = NULL;
37 }
38
tua6100_sleep(struct dvb_frontend * fe)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 (priv->i2c, &msg, 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
tua6100_set_params(struct dvb_frontend * fe)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(priv->i2c, &msg0, 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(priv->i2c, &msg2, 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(priv->i2c, &msg1, 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
tua6100_get_frequency(struct dvb_frontend * fe,u32 * frequency)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
tua6100_attach(struct dvb_frontend * fe,int addr,struct i2c_adapter * i2c)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 (i2c, msg, 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(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(tua6100_attach);
190
191 MODULE_DESCRIPTION("DVB tua6100 driver");
192 MODULE_AUTHOR("Andrew de Quincey");
193 MODULE_LICENSE("GPL");
194