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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(priv->i2c, msg, 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(priv->i2c, &msg, 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(6000, 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, SEC_VOLTAGE_OFF); | |
128 | kfree(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(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, SEC_VOLTAGE_OFF)) { | |
149 | dev_err(&i2c->dev, "no LNBH29 found at I2C addr 0x%02x\n", | |
150 | priv->i2c_address); | |
151 | kfree(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"); |