1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * lnbp21.c - driver for lnb supply and control ic lnbp21
4  *
5  * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
6  * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
7  *
8  * the project's page is at https://linuxtv.org
9  */
10 #include <linux/delay.h>
11 #include <linux/errno.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/string.h>
16 #include <linux/slab.h>
17 
18 #include <media/dvb_frontend.h>
19 #include "lnbp21.h"
20 #include "lnbh24.h"
21 
22 struct lnbp21 {
23 	u8			config;
24 	u8			override_or;
25 	u8			override_and;
26 	struct i2c_adapter	*i2c;
27 	u8			i2c_addr;
28 };
29 
30 static int lnbp21_set_voltage(struct dvb_frontend *fe,
31 			      enum fe_sec_voltage voltage)
32 {
33 	struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
34 	struct i2c_msg msg = {	.addr = lnbp21->i2c_addr, .flags = 0,
35 				.buf = &lnbp21->config,
36 				.len = sizeof(lnbp21->config) };
37 
38 	lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
39 
40 	switch(voltage) {
41 	case SEC_VOLTAGE_OFF:
42 		break;
43 	case SEC_VOLTAGE_13:
44 		lnbp21->config |= LNBP21_EN;
45 		break;
46 	case SEC_VOLTAGE_18:
47 		lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
48 		break;
49 	default:
50 		return -EINVAL;
51 	}
52 
53 	lnbp21->config |= lnbp21->override_or;
54 	lnbp21->config &= lnbp21->override_and;
55 
56 	return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
57 }
58 
59 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
60 {
61 	struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
62 	struct i2c_msg msg = {	.addr = lnbp21->i2c_addr, .flags = 0,
63 				.buf = &lnbp21->config,
64 				.len = sizeof(lnbp21->config) };
65 
66 	if (arg)
67 		lnbp21->config |= LNBP21_LLC;
68 	else
69 		lnbp21->config &= ~LNBP21_LLC;
70 
71 	lnbp21->config |= lnbp21->override_or;
72 	lnbp21->config &= lnbp21->override_and;
73 
74 	return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
75 }
76 
77 static int lnbp21_set_tone(struct dvb_frontend *fe,
78 			   enum fe_sec_tone_mode tone)
79 {
80 	struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
81 	struct i2c_msg msg = {	.addr = lnbp21->i2c_addr, .flags = 0,
82 				.buf = &lnbp21->config,
83 				.len = sizeof(lnbp21->config) };
84 
85 	switch (tone) {
86 	case SEC_TONE_OFF:
87 		lnbp21->config &= ~LNBP21_TEN;
88 		break;
89 	case SEC_TONE_ON:
90 		lnbp21->config |= LNBP21_TEN;
91 		break;
92 	default:
93 		return -EINVAL;
94 	}
95 
96 	lnbp21->config |= lnbp21->override_or;
97 	lnbp21->config &= lnbp21->override_and;
98 
99 	return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
100 }
101 
102 static void lnbp21_release(struct dvb_frontend *fe)
103 {
104 	/* LNBP power off */
105 	lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
106 
107 	/* free data */
108 	kfree(fe->sec_priv);
109 	fe->sec_priv = NULL;
110 }
111 
112 static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
113 				struct i2c_adapter *i2c, u8 override_set,
114 				u8 override_clear, u8 i2c_addr, u8 config)
115 {
116 	struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
117 	if (!lnbp21)
118 		return NULL;
119 
120 	/* default configuration */
121 	lnbp21->config = config;
122 	lnbp21->i2c = i2c;
123 	lnbp21->i2c_addr = i2c_addr;
124 	fe->sec_priv = lnbp21;
125 
126 	/* bits which should be forced to '1' */
127 	lnbp21->override_or = override_set;
128 
129 	/* bits which should be forced to '0' */
130 	lnbp21->override_and = ~override_clear;
131 
132 	/* detect if it is present or not */
133 	if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
134 		kfree(lnbp21);
135 		return NULL;
136 	}
137 
138 	/* install release callback */
139 	fe->ops.release_sec = lnbp21_release;
140 
141 	/* override frontend ops */
142 	fe->ops.set_voltage = lnbp21_set_voltage;
143 	fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
144 	if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
145 		fe->ops.set_tone = lnbp21_set_tone;
146 	printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
147 
148 	return fe;
149 }
150 
151 struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
152 				struct i2c_adapter *i2c, u8 override_set,
153 				u8 override_clear, u8 i2c_addr)
154 {
155 	return lnbx2x_attach(fe, i2c, override_set, override_clear,
156 							i2c_addr, LNBH24_TTX);
157 }
158 EXPORT_SYMBOL_GPL(lnbh24_attach);
159 
160 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
161 				struct i2c_adapter *i2c, u8 override_set,
162 				u8 override_clear)
163 {
164 	return lnbx2x_attach(fe, i2c, override_set, override_clear,
165 							0x08, LNBP21_ISEL);
166 }
167 EXPORT_SYMBOL_GPL(lnbp21_attach);
168 
169 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
170 MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
171 MODULE_LICENSE("GPL");
172