1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Driver for LNB supply and control IC STMicroelectronics LNBH29 |
4 | // |
5 | // Copyright (c) 2018 Socionext Inc. |
6 | |
7 | #include <linux/module.h> |
8 | #include <linux/init.h> |
9 | #include <linux/slab.h> |
10 | |
11 | #include <media/dvb_frontend.h> |
12 | #include "lnbh29.h" |
13 | |
14 | /** |
15 | * struct lnbh29_priv - LNBH29 driver private data |
16 | * @i2c: Pointer to the I2C adapter structure |
17 | * @i2c_address: I2C address of LNBH29 chip |
18 | * @config: Registers configuration |
19 | * offset 0: 1st register address, always 0x01 (DATA) |
20 | * offset 1: DATA register value |
21 | */ |
22 | struct lnbh29_priv { |
23 | struct i2c_adapter *i2c; |
24 | u8 i2c_address; |
25 | u8 config[2]; |
26 | }; |
27 | |
28 | #define LNBH29_STATUS_OLF BIT(0) |
29 | #define LNBH29_STATUS_OTF BIT(1) |
30 | #define LNBH29_STATUS_VMON BIT(2) |
31 | #define LNBH29_STATUS_PNG BIT(3) |
32 | #define LNBH29_STATUS_PDO BIT(4) |
33 | #define LNBH29_VSEL_MASK GENMASK(2, 0) |
34 | #define LNBH29_VSEL_0 0x00 |
35 | /* Min: 13.188V, Typ: 13.667V, Max:14V */ |
36 | #define LNBH29_VSEL_13 0x03 |
37 | /* Min: 18.158V, Typ: 18.817V, Max:19.475V */ |
38 | #define LNBH29_VSEL_18 0x07 |
39 | |
40 | static int lnbh29_read_vmon(struct lnbh29_priv *priv) |
41 | { |
42 | u8 addr = 0x00; |
43 | u8 status[2]; |
44 | int ret; |
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 | ret = i2c_transfer(adap: priv->i2c, msgs: msg, num: 2); |
60 | if (ret >= 0 && ret != 2) |
61 | ret = -EIO; |
62 | if (ret < 0) { |
63 | dev_dbg(&priv->i2c->dev, "LNBH29 I2C transfer failed (%d)\n" , |
64 | ret); |
65 | return ret; |
66 | } |
67 | |
68 | if (status[0] & (LNBH29_STATUS_OLF | LNBH29_STATUS_VMON)) { |
69 | dev_err(&priv->i2c->dev, |
70 | "LNBH29 voltage in failure state, status reg 0x%x\n" , |
71 | status[0]); |
72 | return -EIO; |
73 | } |
74 | |
75 | return 0; |
76 | } |
77 | |
78 | static int lnbh29_set_voltage(struct dvb_frontend *fe, |
79 | enum fe_sec_voltage voltage) |
80 | { |
81 | struct lnbh29_priv *priv = fe->sec_priv; |
82 | u8 data_reg; |
83 | int ret; |
84 | struct i2c_msg msg = { |
85 | .addr = priv->i2c_address, |
86 | .flags = 0, |
87 | .len = sizeof(priv->config), |
88 | .buf = priv->config |
89 | }; |
90 | |
91 | switch (voltage) { |
92 | case SEC_VOLTAGE_OFF: |
93 | data_reg = LNBH29_VSEL_0; |
94 | break; |
95 | case SEC_VOLTAGE_13: |
96 | data_reg = LNBH29_VSEL_13; |
97 | break; |
98 | case SEC_VOLTAGE_18: |
99 | data_reg = LNBH29_VSEL_18; |
100 | break; |
101 | default: |
102 | return -EINVAL; |
103 | } |
104 | priv->config[1] &= ~LNBH29_VSEL_MASK; |
105 | priv->config[1] |= data_reg; |
106 | |
107 | ret = i2c_transfer(adap: priv->i2c, msgs: &msg, num: 1); |
108 | if (ret >= 0 && ret != 1) |
109 | ret = -EIO; |
110 | if (ret < 0) { |
111 | dev_err(&priv->i2c->dev, "LNBH29 I2C transfer error (%d)\n" , |
112 | ret); |
113 | return ret; |
114 | } |
115 | |
116 | /* Soft-start time (Vout 0V to 18V) is Typ. 6ms. */ |
117 | usleep_range(min: 6000, max: 20000); |
118 | |
119 | if (voltage == SEC_VOLTAGE_OFF) |
120 | return 0; |
121 | |
122 | return lnbh29_read_vmon(priv); |
123 | } |
124 | |
125 | static void lnbh29_release(struct dvb_frontend *fe) |
126 | { |
127 | lnbh29_set_voltage(fe, voltage: SEC_VOLTAGE_OFF); |
128 | kfree(objp: fe->sec_priv); |
129 | fe->sec_priv = NULL; |
130 | } |
131 | |
132 | struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe, |
133 | struct lnbh29_config *cfg, |
134 | struct i2c_adapter *i2c) |
135 | { |
136 | struct lnbh29_priv *priv; |
137 | |
138 | priv = kzalloc(size: sizeof(*priv), GFP_KERNEL); |
139 | if (!priv) |
140 | return NULL; |
141 | |
142 | priv->i2c_address = (cfg->i2c_address >> 1); |
143 | priv->i2c = i2c; |
144 | priv->config[0] = 0x01; |
145 | priv->config[1] = cfg->data_config; |
146 | fe->sec_priv = priv; |
147 | |
148 | if (lnbh29_set_voltage(fe, voltage: SEC_VOLTAGE_OFF)) { |
149 | dev_err(&i2c->dev, "no LNBH29 found at I2C addr 0x%02x\n" , |
150 | priv->i2c_address); |
151 | kfree(objp: priv); |
152 | fe->sec_priv = NULL; |
153 | return NULL; |
154 | } |
155 | |
156 | fe->ops.release_sec = lnbh29_release; |
157 | fe->ops.set_voltage = lnbh29_set_voltage; |
158 | |
159 | dev_info(&i2c->dev, "LNBH29 attached at I2C addr 0x%02x\n" , |
160 | priv->i2c_address); |
161 | |
162 | return fe; |
163 | } |
164 | EXPORT_SYMBOL(lnbh29_attach); |
165 | |
166 | MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>" ); |
167 | MODULE_DESCRIPTION("STMicroelectronics LNBH29 driver" ); |
168 | MODULE_LICENSE("GPL v2" ); |
169 | |