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
|
/* $OpenBSD: tsl2560.c,v 1.7 2008/04/18 01:17:51 deraadt Exp $ */
/*
* Copyright (c) 2005 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
/* TSL2560/61 registers */
#define TSL2560_REG_CONTROL 0x80
#define TSL2560_CONTROL_POWER 0x03
#define TSL2560_REG_TIMING 0x81
#define TSL2560_TIMING_GAIN 0x10 /* high gain (16x) */
#define TSL2560_TIMING_INTEG0 0x00 /* 13.7ms */
#define TSL2560_TIMING_INTEG1 0x01 /* 101ms */
#define TSL2560_TIMING_INTEG2 0x02 /* 402ms */
#define TSL2560_REG_ID 0x8a
#define TSL2560_REG_DATA0 0xac
#define TSL2560_REG_DATA1 0xae
struct tsl_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
};
int tsl_match(struct device *, void *, void *);
void tsl_attach(struct device *, struct device *, void *);
void tsl_refresh(void *);
u_int64_t tsl_lux(u_int32_t, u_int32_t);
struct cfattach tsl_ca = {
sizeof(struct tsl_softc), tsl_match, tsl_attach
};
struct cfdriver tsl_cd = {
NULL, "tsl", DV_DULL
};
int
tsl_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "tsl2560") == 0)
return (1);
return (0);
}
void
tsl_attach(struct device *parent, struct device *self, void *aux)
{
struct tsl_softc *sc = (struct tsl_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t cmd, data;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
iic_acquire_bus(sc->sc_tag, 0);
cmd = TSL2560_REG_CONTROL; data = TSL2560_CONTROL_POWER;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": power up failed\n");
return;
}
cmd = TSL2560_REG_TIMING;
data = TSL2560_TIMING_GAIN | TSL2560_TIMING_INTEG2;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": cannot write timing register\n");
return;
}
cmd = TSL2560_REG_ID;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": cannot read ID register\n");
return;
}
iic_release_bus(sc->sc_tag, 0);
switch (data >> 4) {
case 0:
printf(": TSL2560 rev %x", data & 0x0f);
break;
case 1:
printf(": TSL2561 rev %x", data & 0x0f);
break;
default:
printf(": unknown part number %x", data >> 4);
break;
}
/* Initialize sensor data. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor.type = SENSOR_LUX;
if (sensor_task_register(sc, tsl_refresh, 5) == NULL) {
printf(": unable to register update task\n");
return;
}
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
sensordev_install(&sc->sc_sensordev);
printf("\n");
}
void
tsl_refresh(void *arg)
{
struct tsl_softc *sc = arg;
u_int8_t cmd, data[2];
u_int16_t chan0, chan1;
iic_acquire_bus(sc->sc_tag, 0);
cmd = TSL2560_REG_DATA0;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
chan0 = data[1] << 8 | data[0];
cmd = TSL2560_REG_DATA1;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
chan1 = data[1] << 8 | data[0];
iic_release_bus(sc->sc_tag, 0);
sc->sc_sensor.value = tsl_lux(chan0, chan1);
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
/* Precision for fixed-point math. */
#define TSL2560_RATIO_SCALE 9
#define TSL2560_LUX_SCALE 14
/*
* The TSL2560/2561 comes in a ChipScale or TMB-6 package and the
* calibration is slightly different for each package. The constants
* below are for the TMB-6 package.
*/
#define TSL2560_K1T 0x0040 /* 0.125 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B1T 0x01f2 /* 0.0304 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M1T 0x01be /* 0.0272 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K2T 0x0080 /* 0.250 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B2T 0x0214 /* 0.0324 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M2T 0x02d1 /* 0.0440 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K3T 0x00c0 /* 0.375 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B3T 0x023f /* 0.0351 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M3T 0x037b /* 0.0544 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K4T 0x0080 /* 0.50 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B4T 0x0214 /* 0.0381 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M4T 0x02d1 /* 0.0624 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K5T 0x0138 /* 0.61 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B5T 0x016f /* 0.0224 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M5T 0x01fc /* 0.0310 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K6T 0x0100 /* 0.80 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B6T 0x0270 /* 0.0128 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M6T 0x03fe /* 0.0153 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K7T 0x019a /* 1.3 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B7T 0x0018 /* 0.00146 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M7T 0x0012 /* 0.00112 * (1 << TSL2560_LUX_SCALE) */
u_int64_t
tsl_lux(u_int32_t chan0, u_int32_t chan1)
{
u_int32_t ratio, ratio1;
u_int32_t b, m;
int64_t lux;
ratio1 = 0;
if (chan0 != 0)
ratio1 = (chan1 << (TSL2560_RATIO_SCALE + 1)) / chan0;
ratio = (ratio1 + 1) >> 1;
b = 0, m = 0;
if (ratio <= TSL2560_K1T)
b = TSL2560_B1T, m = TSL2560_M1T;
else if (ratio <= TSL2560_K2T)
b = TSL2560_B2T, m = TSL2560_M2T;
else if (ratio <= TSL2560_K3T)
b = TSL2560_B3T, m = TSL2560_M3T;
else if (ratio <= TSL2560_K4T)
b = TSL2560_B4T, m = TSL2560_M4T;
else if (ratio <= TSL2560_K5T)
b = TSL2560_B5T, m = TSL2560_M5T;
else if (ratio <= TSL2560_K6T)
b = TSL2560_B6T, m = TSL2560_M6T;
else if (ratio <= TSL2560_K7T)
b = TSL2560_B7T, m = TSL2560_M7T;
lux = b * chan0 - m * chan1;
if (lux < 0)
lux = 0;
return ((lux * 1000000) >> TSL2560_LUX_SCALE);
}
|
