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
|
/*
* SuperH Pin Function Controller GPIO driver.
*
* Copyright (C) 2008 Magnus Damm
* Copyright (C) 2009 - 2012 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
struct sh_pfc_chip {
struct sh_pfc *pfc;
struct gpio_chip gpio_chip;
};
static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc)
{
return container_of(gc, struct sh_pfc_chip, gpio_chip);
}
static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
{
return gpio_to_pfc_chip(gc)->pfc;
}
static int sh_gpio_request(struct gpio_chip *gc, unsigned offset)
{
return pinctrl_request_gpio(offset);
}
static void sh_gpio_free(struct gpio_chip *gc, unsigned offset)
{
pinctrl_free_gpio(offset);
}
static void sh_gpio_set_value(struct sh_pfc *pfc, unsigned gpio, int value)
{
struct pinmux_data_reg *dr = NULL;
int bit = 0;
if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
BUG();
else
sh_pfc_write_bit(dr, bit, value);
}
static int sh_gpio_get_value(struct sh_pfc *pfc, unsigned gpio)
{
struct pinmux_data_reg *dr = NULL;
int bit = 0;
if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
return -EINVAL;
return sh_pfc_read_bit(dr, bit);
}
static int sh_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
return pinctrl_gpio_direction_input(offset);
}
static int sh_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
int value)
{
sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
return pinctrl_gpio_direction_output(offset);
}
static int sh_gpio_get(struct gpio_chip *gc, unsigned offset)
{
return sh_gpio_get_value(gpio_to_pfc(gc), offset);
}
static void sh_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
}
static int sh_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct sh_pfc *pfc = gpio_to_pfc(gc);
pinmux_enum_t enum_id;
pinmux_enum_t *enum_ids;
int i, k, pos;
pos = 0;
enum_id = 0;
while (1) {
pos = sh_pfc_gpio_to_enum(pfc, offset, pos, &enum_id);
if (pos <= 0 || !enum_id)
break;
for (i = 0; i < pfc->gpio_irq_size; i++) {
enum_ids = pfc->gpio_irq[i].enum_ids;
for (k = 0; enum_ids[k]; k++) {
if (enum_ids[k] == enum_id)
return pfc->gpio_irq[i].irq;
}
}
}
return -ENOSYS;
}
static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip)
{
struct sh_pfc *pfc = chip->pfc;
struct gpio_chip *gc = &chip->gpio_chip;
gc->request = sh_gpio_request;
gc->free = sh_gpio_free;
gc->direction_input = sh_gpio_direction_input;
gc->get = sh_gpio_get;
gc->direction_output = sh_gpio_direction_output;
gc->set = sh_gpio_set;
gc->to_irq = sh_gpio_to_irq;
WARN_ON(pfc->first_gpio != 0); /* needs testing */
gc->label = pfc->name;
gc->owner = THIS_MODULE;
gc->base = pfc->first_gpio;
gc->ngpio = (pfc->last_gpio - pfc->first_gpio) + 1;
}
int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
{
struct sh_pfc_chip *chip;
int ret;
chip = kzalloc(sizeof(struct sh_pfc_chip), GFP_KERNEL);
if (unlikely(!chip))
return -ENOMEM;
chip->pfc = pfc;
sh_pfc_gpio_setup(chip);
ret = gpiochip_add(&chip->gpio_chip);
if (unlikely(ret < 0))
kfree(chip);
pr_info("%s handling gpio %d -> %d\n",
pfc->name, pfc->first_gpio, pfc->last_gpio);
return ret;
}
EXPORT_SYMBOL_GPL(sh_pfc_register_gpiochip);
static int sh_pfc_gpio_match(struct gpio_chip *gc, void *data)
{
return !!strstr(gc->label, data);
}
static int __devinit sh_pfc_gpio_probe(struct platform_device *pdev)
{
struct sh_pfc_chip *chip;
struct gpio_chip *gc;
gc = gpiochip_find("_pfc", sh_pfc_gpio_match);
if (unlikely(!gc)) {
pr_err("Cant find gpio chip\n");
return -ENODEV;
}
chip = gpio_to_pfc_chip(gc);
platform_set_drvdata(pdev, chip);
pr_info("attaching to GPIO chip %s\n", chip->pfc->name);
return 0;
}
static int __devexit sh_pfc_gpio_remove(struct platform_device *pdev)
{
struct sh_pfc_chip *chip = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&chip->gpio_chip);
if (unlikely(ret < 0))
return ret;
kfree(chip);
return 0;
}
static struct platform_driver sh_pfc_gpio_driver = {
.probe = sh_pfc_gpio_probe,
.remove = __devexit_p(sh_pfc_gpio_remove),
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
},
};
static struct platform_device sh_pfc_gpio_device = {
.name = KBUILD_MODNAME,
.id = -1,
};
static int __init sh_pfc_gpio_init(void)
{
int rc;
rc = platform_driver_register(&sh_pfc_gpio_driver);
if (likely(!rc)) {
rc = platform_device_register(&sh_pfc_gpio_device);
if (unlikely(rc))
platform_driver_unregister(&sh_pfc_gpio_driver);
}
return rc;
}
static void __exit sh_pfc_gpio_exit(void)
{
platform_device_unregister(&sh_pfc_gpio_device);
platform_driver_unregister(&sh_pfc_gpio_driver);
}
module_init(sh_pfc_gpio_init);
module_exit(sh_pfc_gpio_exit);
MODULE_AUTHOR("Magnus Damm, Paul Mundt");
MODULE_DESCRIPTION("GPIO driver for SuperH pin function controller");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pfc-gpio");
|
