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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* GPIO support for Cirrus Logic Madera codecs
*
* Copyright (C) 2015-2018 Cirrus Logic
*/
#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/madera/core.h>
#include <linux/mfd/madera/pdata.h>
#include <linux/mfd/madera/registers.h>
struct madera_gpio {
struct madera *madera;
/* storage space for the gpio_chip we're using */
struct gpio_chip gpio_chip;
};
static int madera_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
struct madera *madera = madera_gpio->madera;
unsigned int reg_offset = 2 * offset;
unsigned int val;
int ret;
ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
&val);
if (ret < 0)
return ret;
if (val & MADERA_GP1_DIR_MASK)
return GPIO_LINE_DIRECTION_IN;
return GPIO_LINE_DIRECTION_OUT;
}
static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
{
struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
struct madera *madera = madera_gpio->madera;
unsigned int reg_offset = 2 * offset;
return regmap_update_bits(madera->regmap,
MADERA_GPIO1_CTRL_2 + reg_offset,
MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
}
static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
struct madera *madera = madera_gpio->madera;
unsigned int reg_offset = 2 * offset;
unsigned int val;
int ret;
ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset,
&val);
if (ret < 0)
return ret;
return !!(val & MADERA_GP1_LVL_MASK);
}
static int madera_gpio_direction_out(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
struct madera *madera = madera_gpio->madera;
unsigned int reg_offset = 2 * offset;
unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
int ret;
ret = regmap_update_bits(madera->regmap,
MADERA_GPIO1_CTRL_2 + reg_offset,
MADERA_GP1_DIR_MASK, 0);
if (ret < 0)
return ret;
return regmap_update_bits(madera->regmap,
MADERA_GPIO1_CTRL_1 + reg_offset,
MADERA_GP1_LVL_MASK, reg_val);
}
static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
struct madera *madera = madera_gpio->madera;
unsigned int reg_offset = 2 * offset;
unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
int ret;
ret = regmap_update_bits(madera->regmap,
MADERA_GPIO1_CTRL_1 + reg_offset,
MADERA_GP1_LVL_MASK, reg_val);
/* set() doesn't return an error so log a warning */
if (ret)
dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
MADERA_GPIO1_CTRL_1 + reg_offset, ret);
}
static const struct gpio_chip madera_gpio_chip = {
.label = "madera",
.owner = THIS_MODULE,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.get_direction = madera_gpio_get_direction,
.direction_input = madera_gpio_direction_in,
.get = madera_gpio_get,
.direction_output = madera_gpio_direction_out,
.set = madera_gpio_set,
.set_config = gpiochip_generic_config,
.can_sleep = true,
};
static int madera_gpio_probe(struct platform_device *pdev)
{
struct madera *madera = dev_get_drvdata(pdev->dev.parent);
struct madera_pdata *pdata = &madera->pdata;
struct madera_gpio *madera_gpio;
int ret;
madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio),
GFP_KERNEL);
if (!madera_gpio)
return -ENOMEM;
madera_gpio->madera = madera;
/* Construct suitable gpio_chip from the template in madera_gpio_chip */
madera_gpio->gpio_chip = madera_gpio_chip;
madera_gpio->gpio_chip.parent = pdev->dev.parent;
switch (madera->type) {
case CS47L15:
madera_gpio->gpio_chip.ngpio = CS47L15_NUM_GPIOS;
break;
case CS47L35:
madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
break;
case CS47L85:
case WM1840:
madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
break;
case CS47L90:
case CS47L91:
madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
break;
case CS42L92:
case CS47L92:
case CS47L93:
madera_gpio->gpio_chip.ngpio = CS47L92_NUM_GPIOS;
break;
default:
dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
return -EINVAL;
}
/* We want to be usable on systems that don't use devicetree or acpi */
if (pdata->gpio_base)
madera_gpio->gpio_chip.base = pdata->gpio_base;
else
madera_gpio->gpio_chip.base = -1;
ret = devm_gpiochip_add_data(&pdev->dev,
&madera_gpio->gpio_chip,
madera_gpio);
if (ret < 0) {
dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret);
return ret;
}
/*
* This is part of a composite MFD device which can only be used with
* the corresponding pinctrl driver. On all supported silicon the GPIO
* to pinctrl mapping is fixed in the silicon, so we register it
* explicitly instead of requiring a redundant gpio-ranges in the
* devicetree.
* In any case we also want to work on systems that don't use devicetree
* or acpi.
*/
ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
0, 0, madera_gpio->gpio_chip.ngpio);
if (ret) {
dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret);
return ret;
}
return 0;
}
static struct platform_driver madera_gpio_driver = {
.driver = {
.name = "madera-gpio",
},
.probe = madera_gpio_probe,
};
module_platform_driver(madera_gpio_driver);
MODULE_SOFTDEP("pre: pinctrl-madera");
MODULE_DESCRIPTION("GPIO interface for Madera codecs");
MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:madera-gpio");
|
