1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * isl6421.h - driver for lnb supply and control ic ISL6421 |
4 | * |
5 | * Copyright (C) 2006 Andrew de Quincey |
6 | * Copyright (C) 2006 Oliver Endriss |
7 | * |
8 | * the project's page is at https://linuxtv.org |
9 | */ |
10 | #include <linux/delay.h> |
11 | #include <linux/errno.h> |
12 | #include <linux/init.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> |
15 | #include <linux/string.h> |
16 | #include <linux/slab.h> |
17 | |
18 | #include <media/dvb_frontend.h> |
19 | #include "isl6421.h" |
20 | |
21 | struct isl6421 { |
22 | u8 config; |
23 | u8 override_or; |
24 | u8 override_and; |
25 | struct i2c_adapter *i2c; |
26 | u8 i2c_addr; |
27 | bool is_off; |
28 | }; |
29 | |
30 | static int isl6421_set_voltage(struct dvb_frontend *fe, |
31 | enum fe_sec_voltage voltage) |
32 | { |
33 | int ret; |
34 | u8 buf; |
35 | bool is_off; |
36 | struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; |
37 | struct i2c_msg msg[2] = { |
38 | { |
39 | .addr = isl6421->i2c_addr, |
40 | .flags = 0, |
41 | .buf = &isl6421->config, |
42 | .len = 1, |
43 | }, { |
44 | .addr = isl6421->i2c_addr, |
45 | .flags = I2C_M_RD, |
46 | .buf = &buf, |
47 | .len = 1, |
48 | } |
49 | |
50 | }; |
51 | |
52 | isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); |
53 | |
54 | switch(voltage) { |
55 | case SEC_VOLTAGE_OFF: |
56 | is_off = true; |
57 | break; |
58 | case SEC_VOLTAGE_13: |
59 | is_off = false; |
60 | isl6421->config |= ISL6421_EN1; |
61 | break; |
62 | case SEC_VOLTAGE_18: |
63 | is_off = false; |
64 | isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1); |
65 | break; |
66 | default: |
67 | return -EINVAL; |
68 | } |
69 | |
70 | /* |
71 | * If LNBf were not powered on, disable dynamic current limit, as, |
72 | * according with datasheet, highly capacitive load on the output may |
73 | * cause a difficult start-up. |
74 | */ |
75 | if (isl6421->is_off && !is_off) |
76 | isl6421->config |= ISL6421_DCL; |
77 | |
78 | isl6421->config |= isl6421->override_or; |
79 | isl6421->config &= isl6421->override_and; |
80 | |
81 | ret = i2c_transfer(adap: isl6421->i2c, msgs: msg, num: 2); |
82 | if (ret < 0) |
83 | return ret; |
84 | if (ret != 2) |
85 | return -EIO; |
86 | |
87 | /* Store off status now in case future commands fail */ |
88 | isl6421->is_off = is_off; |
89 | |
90 | /* On overflow, the device will try again after 900 ms (typically) */ |
91 | if (!is_off && (buf & ISL6421_OLF1)) |
92 | msleep(msecs: 1000); |
93 | |
94 | /* Re-enable dynamic current limit */ |
95 | if ((isl6421->config & ISL6421_DCL) && |
96 | !(isl6421->override_or & ISL6421_DCL)) { |
97 | isl6421->config &= ~ISL6421_DCL; |
98 | |
99 | ret = i2c_transfer(adap: isl6421->i2c, msgs: msg, num: 2); |
100 | if (ret < 0) |
101 | return ret; |
102 | if (ret != 2) |
103 | return -EIO; |
104 | } |
105 | |
106 | /* Check if overload flag is active. If so, disable power */ |
107 | if (!is_off && (buf & ISL6421_OLF1)) { |
108 | isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); |
109 | ret = i2c_transfer(adap: isl6421->i2c, msgs: msg, num: 1); |
110 | if (ret < 0) |
111 | return ret; |
112 | if (ret != 1) |
113 | return -EIO; |
114 | isl6421->is_off = true; |
115 | |
116 | dev_warn(&isl6421->i2c->dev, |
117 | "Overload current detected. disabling LNBf power\n" ); |
118 | return -EINVAL; |
119 | } |
120 | |
121 | return 0; |
122 | } |
123 | |
124 | static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) |
125 | { |
126 | struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; |
127 | struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, |
128 | .buf = &isl6421->config, |
129 | .len = sizeof(isl6421->config) }; |
130 | |
131 | if (arg) |
132 | isl6421->config |= ISL6421_LLC1; |
133 | else |
134 | isl6421->config &= ~ISL6421_LLC1; |
135 | |
136 | isl6421->config |= isl6421->override_or; |
137 | isl6421->config &= isl6421->override_and; |
138 | |
139 | return (i2c_transfer(adap: isl6421->i2c, msgs: &msg, num: 1) == 1) ? 0 : -EIO; |
140 | } |
141 | |
142 | static int isl6421_set_tone(struct dvb_frontend *fe, |
143 | enum fe_sec_tone_mode tone) |
144 | { |
145 | struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; |
146 | struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, |
147 | .buf = &isl6421->config, |
148 | .len = sizeof(isl6421->config) }; |
149 | |
150 | switch (tone) { |
151 | case SEC_TONE_ON: |
152 | isl6421->config |= ISL6421_ENT1; |
153 | break; |
154 | case SEC_TONE_OFF: |
155 | isl6421->config &= ~ISL6421_ENT1; |
156 | break; |
157 | default: |
158 | return -EINVAL; |
159 | } |
160 | |
161 | isl6421->config |= isl6421->override_or; |
162 | isl6421->config &= isl6421->override_and; |
163 | |
164 | return (i2c_transfer(adap: isl6421->i2c, msgs: &msg, num: 1) == 1) ? 0 : -EIO; |
165 | } |
166 | |
167 | static void isl6421_release(struct dvb_frontend *fe) |
168 | { |
169 | /* power off */ |
170 | isl6421_set_voltage(fe, voltage: SEC_VOLTAGE_OFF); |
171 | |
172 | /* free */ |
173 | kfree(objp: fe->sec_priv); |
174 | fe->sec_priv = NULL; |
175 | } |
176 | |
177 | struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr, |
178 | u8 override_set, u8 override_clear, bool override_tone) |
179 | { |
180 | struct isl6421 *isl6421 = kmalloc(size: sizeof(struct isl6421), GFP_KERNEL); |
181 | if (!isl6421) |
182 | return NULL; |
183 | |
184 | /* default configuration */ |
185 | isl6421->config = ISL6421_ISEL1; |
186 | isl6421->i2c = i2c; |
187 | isl6421->i2c_addr = i2c_addr; |
188 | fe->sec_priv = isl6421; |
189 | |
190 | /* bits which should be forced to '1' */ |
191 | isl6421->override_or = override_set; |
192 | |
193 | /* bits which should be forced to '0' */ |
194 | isl6421->override_and = ~override_clear; |
195 | |
196 | /* detect if it is present or not */ |
197 | if (isl6421_set_voltage(fe, voltage: SEC_VOLTAGE_OFF)) { |
198 | kfree(objp: isl6421); |
199 | fe->sec_priv = NULL; |
200 | return NULL; |
201 | } |
202 | |
203 | isl6421->is_off = true; |
204 | |
205 | /* install release callback */ |
206 | fe->ops.release_sec = isl6421_release; |
207 | |
208 | /* override frontend ops */ |
209 | fe->ops.set_voltage = isl6421_set_voltage; |
210 | fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage; |
211 | if (override_tone) |
212 | fe->ops.set_tone = isl6421_set_tone; |
213 | |
214 | return fe; |
215 | } |
216 | EXPORT_SYMBOL_GPL(isl6421_attach); |
217 | |
218 | MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421" ); |
219 | MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss" ); |
220 | MODULE_LICENSE("GPL" ); |
221 | |