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
|
/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#define VIB_DRV 0x4A
#define VIB_DRV_SEL_MASK 0xf8
#define VIB_DRV_SEL_SHIFT 0x03
#define VIB_DRV_EN_MANUAL_MASK 0xfc
#define VIB_MAX_LEVEL_mV (3100)
#define VIB_MIN_LEVEL_mV (1200)
#define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)
#define MAX_FF_SPEED 0xff
/**
* struct pm8xxx_vib - structure to hold vibrator data
* @vib_input_dev: input device supporting force feedback
* @work: work structure to set the vibration parameters
* @regmap: regmap for register read/write
* @speed: speed of vibration set from userland
* @active: state of vibrator
* @level: level of vibration to set in the chip
* @reg_vib_drv: VIB_DRV register value
*/
struct pm8xxx_vib {
struct input_dev *vib_input_dev;
struct work_struct work;
struct regmap *regmap;
int speed;
int level;
bool active;
u8 reg_vib_drv;
};
/**
* pm8xxx_vib_set - handler to start/stop vibration
* @vib: pointer to vibrator structure
* @on: state to set
*/
static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
{
int rc;
unsigned int val = vib->reg_vib_drv;
if (on)
val |= ((vib->level << VIB_DRV_SEL_SHIFT) & VIB_DRV_SEL_MASK);
else
val &= ~VIB_DRV_SEL_MASK;
rc = regmap_write(vib->regmap, VIB_DRV, val);
if (rc < 0)
return rc;
vib->reg_vib_drv = val;
return 0;
}
/**
* pm8xxx_work_handler - worker to set vibration level
* @work: pointer to work_struct
*/
static void pm8xxx_work_handler(struct work_struct *work)
{
struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work);
int rc;
unsigned int val;
rc = regmap_read(vib->regmap, VIB_DRV, &val);
if (rc < 0)
return;
/*
* pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
* scale the level to fit into these ranges.
*/
if (vib->speed) {
vib->active = true;
vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
VIB_MIN_LEVEL_mV;
vib->level /= 100;
} else {
vib->active = false;
vib->level = VIB_MIN_LEVEL_mV / 100;
}
pm8xxx_vib_set(vib, vib->active);
}
/**
* pm8xxx_vib_close - callback of input close callback
* @dev: input device pointer
*
* Turns off the vibrator.
*/
static void pm8xxx_vib_close(struct input_dev *dev)
{
struct pm8xxx_vib *vib = input_get_drvdata(dev);
cancel_work_sync(&vib->work);
if (vib->active)
pm8xxx_vib_set(vib, false);
}
/**
* pm8xxx_vib_play_effect - function to handle vib effects.
* @dev: input device pointer
* @data: data of effect
* @effect: effect to play
*
* Currently this driver supports only rumble effects.
*/
static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct pm8xxx_vib *vib = input_get_drvdata(dev);
vib->speed = effect->u.rumble.strong_magnitude >> 8;
if (!vib->speed)
vib->speed = effect->u.rumble.weak_magnitude >> 9;
schedule_work(&vib->work);
return 0;
}
static int pm8xxx_vib_probe(struct platform_device *pdev)
{
struct pm8xxx_vib *vib;
struct input_dev *input_dev;
int error;
unsigned int val;
vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
if (!vib)
return -ENOMEM;
vib->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!vib->regmap)
return -ENODEV;
input_dev = devm_input_allocate_device(&pdev->dev);
if (!input_dev)
return -ENOMEM;
INIT_WORK(&vib->work, pm8xxx_work_handler);
vib->vib_input_dev = input_dev;
/* operate in manual mode */
error = regmap_read(vib->regmap, VIB_DRV, &val);
if (error < 0)
return error;
val &= ~VIB_DRV_EN_MANUAL_MASK;
error = regmap_write(vib->regmap, VIB_DRV, val);
if (error < 0)
return error;
vib->reg_vib_drv = val;
input_dev->name = "pm8xxx_vib_ffmemless";
input_dev->id.version = 1;
input_dev->close = pm8xxx_vib_close;
input_set_drvdata(input_dev, vib);
input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);
error = input_ff_create_memless(input_dev, NULL,
pm8xxx_vib_play_effect);
if (error) {
dev_err(&pdev->dev,
"couldn't register vibrator as FF device\n");
return error;
}
error = input_register_device(input_dev);
if (error) {
dev_err(&pdev->dev, "couldn't register input device\n");
return error;
}
platform_set_drvdata(pdev, vib);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int pm8xxx_vib_suspend(struct device *dev)
{
struct pm8xxx_vib *vib = dev_get_drvdata(dev);
/* Turn off the vibrator */
pm8xxx_vib_set(vib, false);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);
static struct platform_driver pm8xxx_vib_driver = {
.probe = pm8xxx_vib_probe,
.driver = {
.name = "pm8xxx-vib",
.owner = THIS_MODULE,
.pm = &pm8xxx_vib_pm_ops,
},
};
module_platform_driver(pm8xxx_vib_driver);
MODULE_ALIAS("platform:pm8xxx_vib");
MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>");
|
