1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/*
* mc13xxx_adc
*
* Copyright (c) 2018 Zodiac Inflight Innovation
* Author: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
* Based on the code of analogous driver from Linux:
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2009 Sascha Hauer, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <init.h>
#include <malloc.h>
#include <driver.h>
#include <xfuncs.h>
#include <errno.h>
#include <fcntl.h>
#include <io.h>
#include <aiodev.h>
#include <mfd/mc13xxx.h>
#include <linux/err.h>
#define MC13XXX_ADC0_LICELLCON (1 << 0)
#define MC13XXX_ADC0_CHRGICON (1 << 1)
#define MC13XXX_ADC0_BATICON (1 << 2)
#define MC13XXX_ADC0_BUFEN (1 << 3)
#define MC13XXX_ADC0_ADIN7SEL_DIE (1 << 4)
#define MC13XXX_ADC0_ADIN7SEL_UID (2 << 4)
#define MC13XXX_ADC0_ADREFEN (1 << 10)
#define MC13XXX_ADC0_TSMOD0 (1 << 12)
#define MC13XXX_ADC0_TSMOD1 (1 << 13)
#define MC13XXX_ADC0_TSMOD2 (1 << 14)
#define MC13XXX_ADC0_ADINC1 (1 << 16)
#define MC13XXX_ADC0_ADINC2 (1 << 17)
#define MC13XXX_ADC0_TSMOD_MASK (MC13XXX_ADC0_TSMOD0 | \
MC13XXX_ADC0_TSMOD1 | \
MC13XXX_ADC0_TSMOD2)
#define MC13XXX_ADC0_CONFIG_MASK (MC13XXX_ADC0_TSMOD_MASK | \
MC13XXX_ADC0_LICELLCON | \
MC13XXX_ADC0_CHRGICON | \
MC13XXX_ADC0_BATICON)
#define MC13XXX_ADC1_ADEN (1 << 0)
#define MC13XXX_ADC1_RAND (1 << 1)
#define MC13XXX_ADC1_ADSEL (1 << 3)
#define MC13XXX_ADC1_CHAN0_SHIFT 5
#define MC13XXX_ADC1_CHAN1_SHIFT 8
#define MC13XXX_ADC1_ASC (1 << 20)
#define MC13XXX_ADC1_ADTRIGIGN (1 << 21)
struct mc13xx_adc_data {
struct mc13xxx *mc_dev;
struct aiodevice aiodev;
struct aiochannel *aiochan;
};
static inline struct mc13xx_adc_data *
to_mc13xx_adc_data(struct aiochannel *chan)
{
return container_of(chan->aiodev, struct mc13xx_adc_data, aiodev);
}
static int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx,
unsigned int channel,
unsigned int *sample)
{
int i;
int timeout = 100;
u32 adc0, adc1, old_adc0;
mc13xxx_reg_read(mc13xxx, MC13783_REG_ADC(0), &old_adc0);
adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2 | MC13XXX_ADC0_BUFEN;
adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
/* Channels mapped through ADIN7:
* 7 - General purpose ADIN7
* 16 - UID
* 17 - Die temperature */
if (channel > 7 && channel < 16) {
adc1 |= MC13XXX_ADC1_ADSEL;
} else if (channel == 16) {
adc0 |= MC13XXX_ADC0_ADIN7SEL_UID;
channel = 7;
} else if (channel == 17) {
adc0 |= MC13XXX_ADC0_ADIN7SEL_DIE;
channel = 7;
}
adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT;
adc1 |= MC13XXX_ADC1_RAND;
mc13xxx_reg_write(mc13xxx, MC13783_REG_ADC(0), adc0);
mc13xxx_reg_write(mc13xxx, MC13783_REG_ADC(1), adc1);
/* wait for completion. ASC will set to zero */
do {
mc13xxx_reg_read(mc13xxx, MC13783_REG_ADC(1), &adc1);
} while ((adc1 & MC13XXX_ADC1_ASC) && (--timeout > 0));
if (timeout == 0)
return -ETIMEDOUT;
for (i = 0; i < 4; ++i) {
mc13xxx_reg_read(mc13xxx,
MC13783_REG_ADC(2), &sample[i]);
}
return 0;
}
static int mc13xx_adc_read(struct aiochannel *chan, int *val)
{
int i;
int ret;
int mc_type;
unsigned int sample[4];
struct mc13xx_adc_data *mc13xxx_adc;
int acc = 0;
int index = chan->index;
mc13xxx_adc = to_mc13xx_adc_data(chan);
mc_type = mc13xxx_type(mc13xxx_adc->mc_dev);
/* add offset for all 8 channel devices becouse t and UID
* inputs are mapped to channels 16 and 17 */
if ((mc_type != MC13783_TYPE) && (chan->index > 7))
index += 8;
ret = mc13xxx_adc_do_conversion(mc13xxx_adc->mc_dev, index, sample);
if (ret < 0)
goto err;
for (i = 0; i < 4; i++) {
acc += (sample[i] >> 2 & 0x3ff);
acc += (sample[i] >> 14 & 0x3ff);
}
/* div 8 */
acc = acc >> 3;
if (index == 16) {
/* UID */
if (mc_type == MC13892_TYPE) {
/* MC13892 have 1/2 divider
* input range is [0, 4.800V] */
acc = DIV_ROUND_CLOSEST(acc * 4800, 1024);
} else {
/* MC13783 have 0.9 divider
*input range is [0, 2.555V] */
acc = DIV_ROUND_CLOSEST(acc * 2555, 1024);
}
} else if (index == 17) {
/* Die temperature */
if (mc_type == MC13892_TYPE) {
/* MC13892:
* Die Temperature Read Out Code at 25C 680
* Temperature change per LSB +0.4244C */
acc = DIV_ROUND_CLOSEST(-2635920 + acc * 4244, 10);
} else {
/* MC13783:
* Die Temperature Read Out Code at 25C 282
* Temperature change per LSB -1.14C */
acc = 346480 - 1140 * acc;
}
} else {
/* GP input
* input range is [0, 2.3V], value has 10 bits */
acc = DIV_ROUND_CLOSEST(acc * 2300, 1024);
}
*val = acc;
err:
return ret;
}
int mc13xxx_adc_probe(struct device_d *dev, struct mc13xxx *mc_dev)
{
int i;
int ret;
int chans;
struct mc13xx_adc_data *mc13xxx_adc;
mc13xxx_adc = xzalloc(sizeof(*mc13xxx_adc));
if (mc13xxx_type(mc_dev) == MC13783_TYPE) {
/* mc13783 has 16 channels */
chans = 16 + 2;
} else {
chans = 8 + 2;
}
mc13xxx_adc->mc_dev = mc_dev;
mc13xxx_adc->aiodev.num_channels = chans;
mc13xxx_adc->aiochan = xmalloc(mc13xxx_adc->aiodev.num_channels *
sizeof(*mc13xxx_adc->aiochan));
mc13xxx_adc->aiodev.hwdev = dev;
mc13xxx_adc->aiodev.channels =
xmalloc(mc13xxx_adc->aiodev.num_channels *
sizeof(mc13xxx_adc->aiodev.channels[0]));
/* all channels are voltage inputs, expect last one */
for (i = 0; i < chans - 1; i++) {
mc13xxx_adc->aiodev.channels[i] = &mc13xxx_adc->aiochan[i];
mc13xxx_adc->aiochan[i].unit = "mV";
}
/* temperature input */
mc13xxx_adc->aiodev.channels[i] = &mc13xxx_adc->aiochan[i];
mc13xxx_adc->aiochan[i].unit = "mC";
mc13xxx_adc->aiodev.read = mc13xx_adc_read;
ret = aiodevice_register(&mc13xxx_adc->aiodev);
if (!ret)
goto done;
dev_err(dev, "Failed to register AIODEV: %d\n", ret);
kfree(mc13xxx_adc);
done:
return ret;
}
|
