1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * lnbh25.c
4 *
5 * Driver for LNB supply and control IC LNBH25
6 *
7 * Copyright (C) 2014 NetUP Inc.
8 * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
9 * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/string.h>
15 #include <linux/slab.h>
16
17 #include <media/dvb_frontend.h>
18 #include "lnbh25.h"
19
20 /**
21 * struct lnbh25_priv - LNBH25 driver private data
22 * @i2c: pointer to the I2C adapter structure
23 * @i2c_address: I2C address of LNBH25 SEC chip
24 * @config: Registers configuration:
25 * offset 0: 1st register address, always 0x02 (DATA1)
26 * offset 1: DATA1 register value
27 * offset 2: DATA2 register value
28 */
29 struct lnbh25_priv {
30 struct i2c_adapter *i2c;
31 u8 i2c_address;
32 u8 config[3];
33 };
34
35 #define LNBH25_STATUS_OFL 0x1
36 #define LNBH25_STATUS_VMON 0x4
37 #define LNBH25_VSEL_13 0x03
38 #define LNBH25_VSEL_18 0x0a
39
lnbh25_read_vmon(struct lnbh25_priv * priv)40 static int lnbh25_read_vmon(struct lnbh25_priv *priv)
41 {
42 int i, ret;
43 u8 addr = 0x00;
44 u8 status[6];
45 struct i2c_msg msg[2] = {
46 {
47 .addr = priv->i2c_address,
48 .flags = 0,
49 .len = 1,
50 .buf = &addr
51 }, {
52 .addr = priv->i2c_address,
53 .flags = I2C_M_RD,
54 .len = sizeof(status),
55 .buf = status
56 }
57 };
58
59 for (i = 0; i < 2; i++) {
60 ret = i2c_transfer(priv->i2c, &msg[i], 1);
61 if (ret >= 0 && ret != 1)
62 ret = -EIO;
63 if (ret < 0) {
64 dev_dbg(&priv->i2c->dev,
65 "%s(): I2C transfer %d failed (%d)\n",
66 __func__, i, ret);
67 return ret;
68 }
69 }
70 dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
71 __func__, (int) sizeof(status), status);
72 if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
73 dev_err(&priv->i2c->dev,
74 "%s(): voltage in failure state, status reg 0x%x\n",
75 __func__, status[0]);
76 return -EIO;
77 }
78 return 0;
79 }
80
lnbh25_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)81 static int lnbh25_set_voltage(struct dvb_frontend *fe,
82 enum fe_sec_voltage voltage)
83 {
84 int ret;
85 u8 data1_reg;
86 const char *vsel;
87 struct lnbh25_priv *priv = fe->sec_priv;
88 struct i2c_msg msg = {
89 .addr = priv->i2c_address,
90 .flags = 0,
91 .len = sizeof(priv->config),
92 .buf = priv->config
93 };
94
95 switch (voltage) {
96 case SEC_VOLTAGE_OFF:
97 data1_reg = 0x00;
98 vsel = "Off";
99 break;
100 case SEC_VOLTAGE_13:
101 data1_reg = LNBH25_VSEL_13;
102 vsel = "13V";
103 break;
104 case SEC_VOLTAGE_18:
105 data1_reg = LNBH25_VSEL_18;
106 vsel = "18V";
107 break;
108 default:
109 return -EINVAL;
110 }
111 priv->config[1] = data1_reg;
112 dev_dbg(&priv->i2c->dev,
113 "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
114 __func__, vsel, priv->i2c_address,
115 priv->config[0], priv->config[1], priv->config[2]);
116 ret = i2c_transfer(priv->i2c, &msg, 1);
117 if (ret >= 0 && ret != 1)
118 ret = -EIO;
119 if (ret < 0) {
120 dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
121 __func__, ret);
122 return ret;
123 }
124 if (voltage != SEC_VOLTAGE_OFF) {
125 msleep(120);
126 ret = lnbh25_read_vmon(priv);
127 } else {
128 msleep(20);
129 ret = 0;
130 }
131 return ret;
132 }
133
lnbh25_release(struct dvb_frontend * fe)134 static void lnbh25_release(struct dvb_frontend *fe)
135 {
136 struct lnbh25_priv *priv = fe->sec_priv;
137
138 dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
139 lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
140 kfree(fe->sec_priv);
141 fe->sec_priv = NULL;
142 }
143
lnbh25_attach(struct dvb_frontend * fe,struct lnbh25_config * cfg,struct i2c_adapter * i2c)144 struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
145 struct lnbh25_config *cfg,
146 struct i2c_adapter *i2c)
147 {
148 struct lnbh25_priv *priv;
149
150 dev_dbg(&i2c->dev, "%s()\n", __func__);
151 priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
152 if (!priv)
153 return NULL;
154 priv->i2c_address = (cfg->i2c_address >> 1);
155 priv->i2c = i2c;
156 priv->config[0] = 0x02;
157 priv->config[1] = 0x00;
158 priv->config[2] = cfg->data2_config;
159 fe->sec_priv = priv;
160 if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
161 dev_err(&i2c->dev,
162 "%s(): no LNBH25 found at I2C addr 0x%02x\n",
163 __func__, priv->i2c_address);
164 kfree(priv);
165 fe->sec_priv = NULL;
166 return NULL;
167 }
168
169 fe->ops.release_sec = lnbh25_release;
170 fe->ops.set_voltage = lnbh25_set_voltage;
171
172 dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
173 __func__, priv->i2c_address);
174 return fe;
175 }
176 EXPORT_SYMBOL_GPL(lnbh25_attach);
177
178 MODULE_DESCRIPTION("ST LNBH25 driver");
179 MODULE_AUTHOR("info@netup.ru");
180 MODULE_LICENSE("GPL");
181