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path: root/drivers/media/dvb/frontends/isl6423.c
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Diffstat (limited to 'drivers/media/dvb/frontends/isl6423.c')
-rw-r--r--drivers/media/dvb/frontends/isl6423.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/isl6423.c b/drivers/media/dvb/frontends/isl6423.c
new file mode 100644
index 00000000000..dca5bebfeeb
--- /dev/null
+++ b/drivers/media/dvb/frontends/isl6423.c
@@ -0,0 +1,308 @@
1/*
2 Intersil ISL6423 SEC and LNB Power supply controller
3
4 Copyright (C) Manu Abraham <abraham.manu@gmail.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19*/
20
21#include <linux/delay.h>
22#include <linux/errno.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/string.h>
27#include <linux/slab.h>
28
29#include "dvb_frontend.h"
30#include "isl6423.h"
31
32static unsigned int verbose;
33module_param(verbose, int, 0644);
34MODULE_PARM_DESC(verbose, "Set Verbosity level");
35
36#define FE_ERROR 0
37#define FE_NOTICE 1
38#define FE_INFO 2
39#define FE_DEBUG 3
40#define FE_DEBUGREG 4
41
42#define dprintk(__y, __z, format, arg...) do { \
43 if (__z) { \
44 if ((verbose > FE_ERROR) && (verbose > __y)) \
45 printk(KERN_ERR "%s: " format "\n", __func__ , ##arg); \
46 else if ((verbose > FE_NOTICE) && (verbose > __y)) \
47 printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg); \
48 else if ((verbose > FE_INFO) && (verbose > __y)) \
49 printk(KERN_INFO "%s: " format "\n", __func__ , ##arg); \
50 else if ((verbose > FE_DEBUG) && (verbose > __y)) \
51 printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg); \
52 } else { \
53 if (verbose > __y) \
54 printk(format, ##arg); \
55 } \
56} while (0)
57
58struct isl6423_dev {
59 const struct isl6423_config *config;
60 struct i2c_adapter *i2c;
61
62 u8 reg_3;
63 u8 reg_4;
64
65 unsigned int verbose;
66};
67
68static int isl6423_write(struct isl6423_dev *isl6423, u8 reg)
69{
70 struct i2c_adapter *i2c = isl6423->i2c;
71 u8 addr = isl6423->config->addr;
72 int err = 0;
73
74 struct i2c_msg msg = { .addr = addr, .flags = 0, .buf = &reg, .len = 1 };
75
76 dprintk(FE_DEBUG, 1, "write reg %02X", reg);
77 err = i2c_transfer(i2c, &msg, 1);
78 if (err < 0)
79 goto exit;
80 return 0;
81
82exit:
83 dprintk(FE_ERROR, 1, "I/O error <%d>", err);
84 return err;
85}
86
87static int isl6423_set_modulation(struct dvb_frontend *fe)
88{
89 struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
90 const struct isl6423_config *config = isl6423->config;
91 int err = 0;
92 u8 reg_2 = 0;
93
94 reg_2 = 0x01 << 5;
95
96 if (config->mod_extern)
97 reg_2 |= (1 << 3);
98 else
99 reg_2 |= (1 << 4);
100
101 err = isl6423_write(isl6423, reg_2);
102 if (err < 0)
103 goto exit;
104 return 0;
105
106exit:
107 dprintk(FE_ERROR, 1, "I/O error <%d>", err);
108 return err;
109}
110
111static int isl6423_voltage_boost(struct dvb_frontend *fe, long arg)
112{
113 struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
114 u8 reg_3 = isl6423->reg_3;
115 u8 reg_4 = isl6423->reg_4;
116 int err = 0;
117
118 if (arg) {
119 /* EN = 1, VSPEN = 1, VBOT = 1 */
120 reg_4 |= (1 << 4);
121 reg_4 |= 0x1;
122 reg_3 |= (1 << 3);
123 } else {
124 /* EN = 1, VSPEN = 1, VBOT = 0 */
125 reg_4 |= (1 << 4);
126 reg_4 &= ~0x1;
127 reg_3 |= (1 << 3);
128 }
129 err = isl6423_write(isl6423, reg_3);
130 if (err < 0)
131 goto exit;
132
133 err = isl6423_write(isl6423, reg_4);
134 if (err < 0)
135 goto exit;
136
137 isl6423->reg_3 = reg_3;
138 isl6423->reg_4 = reg_4;
139
140 return 0;
141exit:
142 dprintk(FE_ERROR, 1, "I/O error <%d>", err);
143 return err;
144}
145
146
147static int isl6423_set_voltage(struct dvb_frontend *fe,
148 enum fe_sec_voltage voltage)
149{
150 struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
151 u8 reg_3 = isl6423->reg_3;
152 u8 reg_4 = isl6423->reg_4;
153 int err = 0;
154
155 switch (voltage) {
156 case SEC_VOLTAGE_OFF:
157 /* EN = 0 */
158 reg_4 &= ~(1 << 4);
159 break;
160
161 case SEC_VOLTAGE_13:
162 /* EN = 1, VSPEN = 1, VTOP = 0, VBOT = 0 */
163 reg_4 |= (1 << 4);
164 reg_4 &= ~0x3;
165 reg_3 |= (1 << 3);
166 break;
167
168 case SEC_VOLTAGE_18:
169 /* EN = 1, VSPEN = 1, VTOP = 1, VBOT = 0 */
170 reg_4 |= (1 << 4);
171 reg_4 |= 0x2;
172 reg_4 &= ~0x1;
173 reg_3 |= (1 << 3);
174 break;
175
176 default:
177 break;
178 }
179 err = isl6423_write(isl6423, reg_3);
180 if (err < 0)
181 goto exit;
182
183 err = isl6423_write(isl6423, reg_4);
184 if (err < 0)
185 goto exit;
186
187 isl6423->reg_3 = reg_3;
188 isl6423->reg_4 = reg_4;
189
190 return 0;
191exit:
192 dprintk(FE_ERROR, 1, "I/O error <%d>", err);
193 return err;
194}
195
196static int isl6423_set_current(struct dvb_frontend *fe)
197{
198 struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
199 u8 reg_3 = isl6423->reg_3;
200 const struct isl6423_config *config = isl6423->config;
201 int err = 0;
202
203 switch (config->current_max) {
204 case SEC_CURRENT_275m:
205 /* 275mA */
206 /* ISELH = 0, ISELL = 0 */
207 reg_3 &= ~0x3;
208 break;
209
210 case SEC_CURRENT_515m:
211 /* 515mA */
212 /* ISELH = 0, ISELL = 1 */
213 reg_3 &= ~0x2;
214 reg_3 |= 0x1;
215 break;
216
217 case SEC_CURRENT_635m:
218 /* 635mA */
219 /* ISELH = 1, ISELL = 0 */
220 reg_3 &= ~0x1;
221 reg_3 |= 0x2;
222 break;
223
224 case SEC_CURRENT_800m:
225 /* 800mA */
226 /* ISELH = 1, ISELL = 1 */
227 reg_3 |= 0x3;
228 break;
229 }
230
231 err = isl6423_write(isl6423, reg_3);
232 if (err < 0)
233 goto exit;
234
235 switch (config->curlim) {
236 case SEC_CURRENT_LIM_ON:
237 /* DCL = 0 */
238 reg_3 &= ~0x10;
239 break;
240
241 case SEC_CURRENT_LIM_OFF:
242 /* DCL = 1 */
243 reg_3 |= 0x10;
244 break;
245 }
246
247 err = isl6423_write(isl6423, reg_3);
248 if (err < 0)
249 goto exit;
250
251 isl6423->reg_3 = reg_3;
252
253 return 0;
254exit:
255 dprintk(FE_ERROR, 1, "I/O error <%d>", err);
256 return err;
257}
258
259static void isl6423_release(struct dvb_frontend *fe)
260{
261 isl6423_set_voltage(fe, SEC_VOLTAGE_OFF);
262
263 kfree(fe->sec_priv);
264 fe->sec_priv = NULL;
265}
266
267struct dvb_frontend *isl6423_attach(struct dvb_frontend *fe,
268 struct i2c_adapter *i2c,
269 const struct isl6423_config *config)
270{
271 struct isl6423_dev *isl6423;
272
273 isl6423 = kzalloc(sizeof(struct isl6423_dev), GFP_KERNEL);
274 if (!isl6423)
275 return NULL;
276
277 isl6423->config = config;
278 isl6423->i2c = i2c;
279 fe->sec_priv = isl6423;
280
281 /* SR3H = 0, SR3M = 1, SR3L = 0 */
282 isl6423->reg_3 = 0x02 << 5;
283 /* SR4H = 0, SR4M = 1, SR4L = 1 */
284 isl6423->reg_4 = 0x03 << 5;
285
286 if (isl6423_set_current(fe))
287 goto exit;
288
289 if (isl6423_set_modulation(fe))
290 goto exit;
291
292 fe->ops.release_sec = isl6423_release;
293 fe->ops.set_voltage = isl6423_set_voltage;
294 fe->ops.enable_high_lnb_voltage = isl6423_voltage_boost;
295 isl6423->verbose = verbose;
296
297 return fe;
298
299exit:
300 kfree(isl6423);
301 fe->sec_priv = NULL;
302 return NULL;
303}
304EXPORT_SYMBOL(isl6423_attach);
305
306MODULE_DESCRIPTION("ISL6423 SEC");
307MODULE_AUTHOR("Manu Abraham");
308MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-07-21 06:54:09 -0400