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1 | /* |
2 | * lnbh25.c | |
3 | * | |
4 | * Driver for LNB supply and control IC LNBH25 | |
5 | * | |
6 | * Copyright (C) 2014 NetUP Inc. | |
7 | * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru> | |
8 | * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/slab.h> | |
25 | ||
fada1935 | 26 | #include <media/dvb_frontend.h> |
e025273b KS |
27 | #include "lnbh25.h" |
28 | ||
29 | /** | |
30 | * struct lnbh25_priv - LNBH25 driver private data | |
31 | * @i2c: pointer to the I2C adapter structure | |
32 | * @i2c_address: I2C address of LNBH25 SEC chip | |
33 | * @config: Registers configuration: | |
34 | * offset 0: 1st register address, always 0x02 (DATA1) | |
35 | * offset 1: DATA1 register value | |
36 | * offset 2: DATA2 register value | |
37 | */ | |
38 | struct lnbh25_priv { | |
39 | struct i2c_adapter *i2c; | |
40 | u8 i2c_address; | |
41 | u8 config[3]; | |
42 | }; | |
43 | ||
44 | #define LNBH25_STATUS_OFL 0x1 | |
45 | #define LNBH25_STATUS_VMON 0x4 | |
46 | #define LNBH25_VSEL_13 0x03 | |
47 | #define LNBH25_VSEL_18 0x0a | |
48 | ||
49 | static int lnbh25_read_vmon(struct lnbh25_priv *priv) | |
50 | { | |
51 | int i, ret; | |
52 | u8 addr = 0x00; | |
53 | u8 status[6]; | |
54 | struct i2c_msg msg[2] = { | |
55 | { | |
56 | .addr = priv->i2c_address, | |
57 | .flags = 0, | |
58 | .len = 1, | |
59 | .buf = &addr | |
60 | }, { | |
61 | .addr = priv->i2c_address, | |
62 | .flags = I2C_M_RD, | |
63 | .len = sizeof(status), | |
64 | .buf = status | |
65 | } | |
66 | }; | |
67 | ||
68 | for (i = 0; i < 2; i++) { | |
69 | ret = i2c_transfer(priv->i2c, &msg[i], 1); | |
70 | if (ret >= 0 && ret != 1) | |
71 | ret = -EIO; | |
72 | if (ret < 0) { | |
73 | dev_dbg(&priv->i2c->dev, | |
74 | "%s(): I2C transfer %d failed (%d)\n", | |
75 | __func__, i, ret); | |
76 | return ret; | |
77 | } | |
78 | } | |
e1bdf024 DS |
79 | dev_dbg(&priv->i2c->dev, "%s(): %*ph\n", |
80 | __func__, (int) sizeof(status), status); | |
e025273b KS |
81 | if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) { |
82 | dev_err(&priv->i2c->dev, | |
83 | "%s(): voltage in failure state, status reg 0x%x\n", | |
84 | __func__, status[0]); | |
85 | return -EIO; | |
86 | } | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static int lnbh25_set_voltage(struct dvb_frontend *fe, | |
91 | enum fe_sec_voltage voltage) | |
92 | { | |
93 | int ret; | |
94 | u8 data1_reg; | |
95 | const char *vsel; | |
96 | struct lnbh25_priv *priv = fe->sec_priv; | |
97 | struct i2c_msg msg = { | |
98 | .addr = priv->i2c_address, | |
99 | .flags = 0, | |
100 | .len = sizeof(priv->config), | |
101 | .buf = priv->config | |
102 | }; | |
103 | ||
104 | switch (voltage) { | |
105 | case SEC_VOLTAGE_OFF: | |
106 | data1_reg = 0x00; | |
107 | vsel = "Off"; | |
108 | break; | |
109 | case SEC_VOLTAGE_13: | |
110 | data1_reg = LNBH25_VSEL_13; | |
111 | vsel = "13V"; | |
112 | break; | |
113 | case SEC_VOLTAGE_18: | |
114 | data1_reg = LNBH25_VSEL_18; | |
115 | vsel = "18V"; | |
116 | break; | |
117 | default: | |
118 | return -EINVAL; | |
119 | } | |
120 | priv->config[1] = data1_reg; | |
121 | dev_dbg(&priv->i2c->dev, | |
122 | "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n", | |
123 | __func__, vsel, priv->i2c_address, | |
124 | priv->config[0], priv->config[1], priv->config[2]); | |
125 | ret = i2c_transfer(priv->i2c, &msg, 1); | |
126 | if (ret >= 0 && ret != 1) | |
127 | ret = -EIO; | |
128 | if (ret < 0) { | |
129 | dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n", | |
130 | __func__, ret); | |
131 | return ret; | |
132 | } | |
133 | if (voltage != SEC_VOLTAGE_OFF) { | |
134 | msleep(120); | |
135 | ret = lnbh25_read_vmon(priv); | |
136 | } else { | |
137 | msleep(20); | |
138 | ret = 0; | |
139 | } | |
140 | return ret; | |
141 | } | |
142 | ||
143 | static void lnbh25_release(struct dvb_frontend *fe) | |
144 | { | |
145 | struct lnbh25_priv *priv = fe->sec_priv; | |
146 | ||
147 | dev_dbg(&priv->i2c->dev, "%s()\n", __func__); | |
148 | lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF); | |
149 | kfree(fe->sec_priv); | |
150 | fe->sec_priv = NULL; | |
151 | } | |
152 | ||
153 | struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe, | |
154 | struct lnbh25_config *cfg, | |
155 | struct i2c_adapter *i2c) | |
156 | { | |
157 | struct lnbh25_priv *priv; | |
158 | ||
159 | dev_dbg(&i2c->dev, "%s()\n", __func__); | |
160 | priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL); | |
161 | if (!priv) | |
162 | return NULL; | |
163 | priv->i2c_address = (cfg->i2c_address >> 1); | |
164 | priv->i2c = i2c; | |
165 | priv->config[0] = 0x02; | |
166 | priv->config[1] = 0x00; | |
167 | priv->config[2] = cfg->data2_config; | |
168 | fe->sec_priv = priv; | |
169 | if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) { | |
170 | dev_err(&i2c->dev, | |
171 | "%s(): no LNBH25 found at I2C addr 0x%02x\n", | |
172 | __func__, priv->i2c_address); | |
173 | kfree(priv); | |
174 | fe->sec_priv = NULL; | |
175 | return NULL; | |
176 | } | |
177 | ||
178 | fe->ops.release_sec = lnbh25_release; | |
179 | fe->ops.set_voltage = lnbh25_set_voltage; | |
180 | ||
e1bdf024 | 181 | dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n", |
e025273b KS |
182 | __func__, priv->i2c_address); |
183 | return fe; | |
184 | } | |
185 | EXPORT_SYMBOL(lnbh25_attach); | |
186 | ||
187 | MODULE_DESCRIPTION("ST LNBH25 driver"); | |
188 | MODULE_AUTHOR("info@netup.ru"); | |
189 | MODULE_LICENSE("GPL"); |