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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e025273b KS |
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> | |
e025273b KS |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/slab.h> | |
16 | ||
fada1935 | 17 | #include <media/dvb_frontend.h> |
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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 | ||
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 | } | |
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70 | dev_dbg(&priv->i2c->dev, "%s(): %*ph\n", |
71 | __func__, (int) sizeof(status), status); | |
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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 | ||
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 | ||
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 | ||
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 | ||
e1bdf024 | 172 | dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n", |
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173 | __func__, priv->i2c_address); |
174 | return fe; | |
175 | } | |
176 | EXPORT_SYMBOL(lnbh25_attach); | |
177 | ||
178 | MODULE_DESCRIPTION("ST LNBH25 driver"); | |
179 | MODULE_AUTHOR("info@netup.ru"); | |
180 | MODULE_LICENSE("GPL"); |