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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
|
/* $NetBSD: max77620.c,v 1.11 2021/01/27 02:29:48 thorpej Exp $ */
/*-
* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: max77620.c,v 1.11 2021/01/27 02:29:48 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <sys/gpio.h>
#include <dev/i2c/i2cvar.h>
#include <dev/fdt/fdtvar.h>
#define MAX_GPIO_REG(n) (0x36 + (n))
#define MAX_GPIO_DEBOUNCE __BITS(7,6)
#define MAX_GPIO_INT __BITS(5,4)
#define MAX_GPIO_OUTPUT_VAL __BIT(3)
#define MAX_GPIO_INPUT_VAL __BIT(2)
#define MAX_GPIO_DIR __BIT(1)
#define MAX_GPIO_DRV __BIT(0)
#define MAX_GPIO_COUNT 8
struct max77620_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
int sc_phandle;
};
struct max77620_pin {
struct max77620_softc *pin_sc;
int pin_num;
int pin_flags;
bool pin_actlo;
};
static const struct device_compatible_entry compat_data[] = {
{ .compat = "maxim,max77620" },
DEVICE_COMPAT_EOL
};
static uint8_t
max77620_read(struct max77620_softc *sc, uint8_t reg, int flags)
{
uint8_t val = 0;
int error;
error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
®, 1, &val, 1, flags);
if (error != 0)
aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error);
return val;
}
static void
max77620_write(struct max77620_softc *sc, uint8_t reg, uint8_t val, int flags)
{
int error;
error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
®, 1, &val, 1, flags);
if (error != 0)
aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error);
}
#define I2C_READ(sc, reg) max77620_read((sc), (reg), 0)
#define I2C_WRITE(sc, reg, val) max77620_write((sc), (reg), (val), 0)
#define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, 0)
#define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, 0)
static int
max77620_gpio_config(struct max77620_softc *sc, int pin, int flags)
{
uint32_t gpio;
KASSERT(pin >= 0 && pin < MAX_GPIO_COUNT);
gpio = I2C_READ(sc, MAX_GPIO_REG(pin));
switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
case GPIO_PIN_INPUT:
gpio |= MAX_GPIO_DIR;
break;
case GPIO_PIN_OUTPUT:
gpio &= ~MAX_GPIO_DIR;
break;
default:
return EINVAL;
}
switch (flags & (GPIO_PIN_PUSHPULL|GPIO_PIN_OPENDRAIN)) {
case GPIO_PIN_PUSHPULL:
gpio |= MAX_GPIO_DRV;
break;
case GPIO_PIN_OPENDRAIN:
gpio &= ~MAX_GPIO_DRV;
break;
default:
return EINVAL;
}
I2C_WRITE(sc, MAX_GPIO_REG(pin), gpio);
return 0;
}
static void *
max77620_gpio_acquire(device_t dev, const void *data, size_t len, int flags)
{
struct max77620_softc * const sc = device_private(dev);
struct max77620_pin *gpin;
const u_int *gpio = data;
int error;
if (len != 12)
return NULL;
const uint8_t pin = be32toh(gpio[1]) & 0xff;
const bool actlo = (be32toh(gpio[2]) & __BIT(0)) != 0;
const bool pushpull = (be32toh(gpio[2]) & __BIT(1)) == 0;
const bool opendrain = (be32toh(gpio[2]) & __BIT(2)) != 0;
if (pushpull)
flags |= GPIO_PIN_PUSHPULL;
if (opendrain)
flags |= GPIO_PIN_OPENDRAIN;
if (pin >= MAX_GPIO_COUNT)
return NULL;
I2C_LOCK(sc);
error = max77620_gpio_config(sc, pin, flags);
I2C_UNLOCK(sc);
if (error != 0) {
device_printf(dev, "bad pin %d config %#x\n", pin, flags);
return NULL;
}
gpin = kmem_zalloc(sizeof(*gpin), KM_SLEEP);
gpin->pin_sc = sc;
gpin->pin_num = pin;
gpin->pin_flags = flags;
gpin->pin_actlo = actlo;
return gpin;
}
static void
max77620_gpio_release(device_t dev, void *priv)
{
struct max77620_softc * const sc = device_private(dev);
struct max77620_pin *gpin = priv;
I2C_LOCK(sc);
max77620_gpio_config(sc, gpin->pin_num, GPIO_PIN_INPUT|GPIO_PIN_OPENDRAIN);
I2C_UNLOCK(sc);
kmem_free(gpin, sizeof(*gpin));
}
static int
max77620_gpio_read(device_t dev, void *priv, bool raw)
{
struct max77620_softc * const sc = device_private(dev);
struct max77620_pin *gpin = priv;
uint8_t gpio;
int val;
/*
* Performing a register read only; no need to acquire
* the max77620 lock.
*/
I2C_LOCK(sc);
gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num));
I2C_UNLOCK(sc);
val = __SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL);
if (!raw && gpin->pin_actlo)
val = !val;
#ifdef MAX77620_DEBUG
device_printf(sc->sc_dev, "GPIO%d rd %02x (%d %d)\n",
gpin->pin_num, gpio,
(int)__SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL), val);
#endif
return val;
}
static void
max77620_gpio_write(device_t dev, void *priv, int val, bool raw)
{
struct max77620_softc * const sc = device_private(dev);
struct max77620_pin *gpin = priv;
uint8_t gpio;
if (!raw && gpin->pin_actlo)
val = !val;
I2C_LOCK(sc);
gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num));
gpio &= ~MAX_GPIO_OUTPUT_VAL;
gpio |= __SHIFTIN(val, MAX_GPIO_OUTPUT_VAL);
#ifdef MAX77620_DEBUG
device_printf(sc->sc_dev, "GPIO%d wr %02x -> %02x\n",
gpin->pin_num,
I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num)), gpio);
#endif
I2C_WRITE(sc, MAX_GPIO_REG(gpin->pin_num), gpio);
I2C_UNLOCK(sc);
}
static struct fdtbus_gpio_controller_func max77620_gpio_funcs = {
.acquire = max77620_gpio_acquire,
.release = max77620_gpio_release,
.read = max77620_gpio_read,
.write = max77620_gpio_write,
};
static void
max77620_gpio_attach(struct max77620_softc *sc)
{
fdtbus_register_gpio_controller(sc->sc_dev, sc->sc_phandle,
&max77620_gpio_funcs);
}
static int
max77620_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
int match_result;
if (iic_use_direct_match(ia, match, compat_data, &match_result))
return match_result;
return 0;
}
static void
max77620_attach(device_t parent, device_t self, void *aux)
{
struct max77620_softc * const sc = device_private(self);
struct i2c_attach_args *ia = aux;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_phandle = ia->ia_cookie;
aprint_naive("\n");
aprint_normal(": MAX77620 Power Management IC\n");
max77620_gpio_attach(sc);
}
CFATTACH_DECL_NEW(max77620pmic, sizeof(struct max77620_softc),
max77620_match, max77620_attach, NULL, NULL);
|