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
|
// SPDX-License-Identifier: GPL-2.0
/* Author: Dan Scally <djrscally@gmail.com> */
#include <linux/acpi.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include "common.h"
/*
* The regulators have to have .ops to be valid, but the only ops we actually
* support are .enable and .disable which are handled via .ena_gpiod. Pass an
* empty struct to clear the check without lying about capabilities.
*/
static const struct regulator_ops int3472_gpio_regulator_ops;
static int skl_int3472_clk_prepare(struct clk_hw *hw)
{
struct int3472_gpio_clock *clk = to_int3472_clk(hw);
gpiod_set_value_cansleep(clk->ena_gpio, 1);
gpiod_set_value_cansleep(clk->led_gpio, 1);
return 0;
}
static void skl_int3472_clk_unprepare(struct clk_hw *hw)
{
struct int3472_gpio_clock *clk = to_int3472_clk(hw);
gpiod_set_value_cansleep(clk->ena_gpio, 0);
gpiod_set_value_cansleep(clk->led_gpio, 0);
}
static int skl_int3472_clk_enable(struct clk_hw *hw)
{
/*
* We're just turning a GPIO on to enable the clock, which operation
* has the potential to sleep. Given .enable() cannot sleep, but
* .prepare() can, we toggle the GPIO in .prepare() instead. Thus,
* nothing to do here.
*/
return 0;
}
static void skl_int3472_clk_disable(struct clk_hw *hw)
{
/* Likewise, nothing to do here... */
}
static unsigned int skl_int3472_get_clk_frequency(struct int3472_discrete_device *int3472)
{
union acpi_object *obj;
unsigned int freq;
obj = skl_int3472_get_acpi_buffer(int3472->sensor, "SSDB");
if (IS_ERR(obj))
return 0; /* report rate as 0 on error */
if (obj->buffer.length < CIO2_SENSOR_SSDB_MCLKSPEED_OFFSET + sizeof(u32)) {
dev_err(int3472->dev, "The buffer is too small\n");
kfree(obj);
return 0;
}
freq = *(u32 *)(obj->buffer.pointer + CIO2_SENSOR_SSDB_MCLKSPEED_OFFSET);
kfree(obj);
return freq;
}
static unsigned long skl_int3472_clk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct int3472_gpio_clock *clk = to_int3472_clk(hw);
return clk->frequency;
}
static const struct clk_ops skl_int3472_clock_ops = {
.prepare = skl_int3472_clk_prepare,
.unprepare = skl_int3472_clk_unprepare,
.enable = skl_int3472_clk_enable,
.disable = skl_int3472_clk_disable,
.recalc_rate = skl_int3472_clk_recalc_rate,
};
int skl_int3472_register_clock(struct int3472_discrete_device *int3472)
{
struct clk_init_data init = {
.ops = &skl_int3472_clock_ops,
.flags = CLK_GET_RATE_NOCACHE,
};
int ret;
init.name = kasprintf(GFP_KERNEL, "%s-clk",
acpi_dev_name(int3472->adev));
if (!init.name)
return -ENOMEM;
int3472->clock.frequency = skl_int3472_get_clk_frequency(int3472);
int3472->clock.clk_hw.init = &init;
int3472->clock.clk = clk_register(&int3472->adev->dev,
&int3472->clock.clk_hw);
if (IS_ERR(int3472->clock.clk)) {
ret = PTR_ERR(int3472->clock.clk);
goto out_free_init_name;
}
int3472->clock.cl = clkdev_create(int3472->clock.clk, NULL,
int3472->sensor_name);
if (!int3472->clock.cl) {
ret = -ENOMEM;
goto err_unregister_clk;
}
kfree(init.name);
return 0;
err_unregister_clk:
clk_unregister(int3472->clock.clk);
out_free_init_name:
kfree(init.name);
return ret;
}
void skl_int3472_unregister_clock(struct int3472_discrete_device *int3472)
{
clkdev_drop(int3472->clock.cl);
clk_unregister(int3472->clock.clk);
}
int skl_int3472_register_regulator(struct int3472_discrete_device *int3472,
struct acpi_resource_gpio *agpio)
{
const struct int3472_sensor_config *sensor_config;
char *path = agpio->resource_source.string_ptr;
struct regulator_consumer_supply supply_map;
struct regulator_init_data init_data = { };
struct regulator_config cfg = { };
int ret;
sensor_config = int3472->sensor_config;
if (IS_ERR(sensor_config)) {
dev_err(int3472->dev, "No sensor module config\n");
return PTR_ERR(sensor_config);
}
if (!sensor_config->supply_map.supply) {
dev_err(int3472->dev, "No supply name defined\n");
return -ENODEV;
}
init_data.constraints.valid_ops_mask = REGULATOR_CHANGE_STATUS;
init_data.num_consumer_supplies = 1;
supply_map = sensor_config->supply_map;
supply_map.dev_name = int3472->sensor_name;
init_data.consumer_supplies = &supply_map;
snprintf(int3472->regulator.regulator_name,
sizeof(int3472->regulator.regulator_name), "%s-regulator",
acpi_dev_name(int3472->adev));
snprintf(int3472->regulator.supply_name,
GPIO_REGULATOR_SUPPLY_NAME_LENGTH, "supply-0");
int3472->regulator.rdesc = INT3472_REGULATOR(
int3472->regulator.regulator_name,
int3472->regulator.supply_name,
&int3472_gpio_regulator_ops);
int3472->regulator.gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0],
"int3472,regulator");
if (IS_ERR(int3472->regulator.gpio)) {
dev_err(int3472->dev, "Failed to get regulator GPIO line\n");
return PTR_ERR(int3472->regulator.gpio);
}
cfg.dev = &int3472->adev->dev;
cfg.init_data = &init_data;
cfg.ena_gpiod = int3472->regulator.gpio;
int3472->regulator.rdev = regulator_register(&int3472->regulator.rdesc,
&cfg);
if (IS_ERR(int3472->regulator.rdev)) {
ret = PTR_ERR(int3472->regulator.rdev);
goto err_free_gpio;
}
return 0;
err_free_gpio:
gpiod_put(int3472->regulator.gpio);
return ret;
}
void skl_int3472_unregister_regulator(struct int3472_discrete_device *int3472)
{
regulator_unregister(int3472->regulator.rdev);
gpiod_put(int3472->regulator.gpio);
}
|
