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 | |
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(adap: priv->i2c, msgs: &msg[i], num: 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 | |
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(adap: priv->i2c, msgs: &msg, num: 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(msecs: 120); |
126 | ret = lnbh25_read_vmon(priv); |
127 | } else { |
128 | msleep(msecs: 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, voltage: SEC_VOLTAGE_OFF); |
140 | kfree(objp: 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(size: 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, voltage: 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(objp: 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 | |