tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/platform_device.h>
17#include <linux/input.h>
18#include <linux/slab.h>
19#include <linux/regmap.h>
20
21#define VIB_DRV 0x4A
22
23#define VIB_DRV_SEL_MASK 0xf8
24#define VIB_DRV_SEL_SHIFT 0x03
25#define VIB_DRV_EN_MANUAL_MASK 0xfc
26
27#define VIB_MAX_LEVEL_mV (3100)
28#define VIB_MIN_LEVEL_mV (1200)
29#define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)
30
31#define MAX_FF_SPEED 0xff
32
33/**
34 * struct pm8xxx_vib - structure to hold vibrator data
35 * @vib_input_dev: input device supporting force feedback
36 * @work: work structure to set the vibration parameters
37 * @regmap: regmap for register read/write
38 * @speed: speed of vibration set from userland
39 * @active: state of vibrator
40 * @level: level of vibration to set in the chip
41 * @reg_vib_drv: VIB_DRV register value
42 */
43struct pm8xxx_vib {
44 struct input_dev *vib_input_dev;
45 struct work_struct work;
46 struct regmap *regmap;
47 int speed;
48 int level;
49 bool active;
50 u8 reg_vib_drv;
51};
52
53/**
54 * pm8xxx_vib_set - handler to start/stop vibration
55 * @vib: pointer to vibrator structure
56 * @on: state to set
57 */
58static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
59{
60 int rc;
61 unsigned int val = vib->reg_vib_drv;
62
63 if (on)
64 val |= ((vib->level << VIB_DRV_SEL_SHIFT) & VIB_DRV_SEL_MASK);
65 else
66 val &= ~VIB_DRV_SEL_MASK;
67
68 rc = regmap_write(vib->regmap, VIB_DRV, val);
69 if (rc < 0)
70 return rc;
71
72 vib->reg_vib_drv = val;
73 return 0;
74}
75
76/**
77 * pm8xxx_work_handler - worker to set vibration level
78 * @work: pointer to work_struct
79 */
80static void pm8xxx_work_handler(struct work_struct *work)
81{
82 struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work);
83 int rc;
84 unsigned int val;
85
86 rc = regmap_read(vib->regmap, VIB_DRV, &val);
87 if (rc < 0)
88 return;
89
90 /*
91 * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
92 * scale the level to fit into these ranges.
93 */
94 if (vib->speed) {
95 vib->active = true;
96 vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
97 VIB_MIN_LEVEL_mV;
98 vib->level /= 100;
99 } else {
100 vib->active = false;
101 vib->level = VIB_MIN_LEVEL_mV / 100;
102 }
103
104 pm8xxx_vib_set(vib, vib->active);
105}
106
107/**
108 * pm8xxx_vib_close - callback of input close callback
109 * @dev: input device pointer
110 *
111 * Turns off the vibrator.
112 */
113static void pm8xxx_vib_close(struct input_dev *dev)
114{
115 struct pm8xxx_vib *vib = input_get_drvdata(dev);
116
117 cancel_work_sync(&vib->work);
118 if (vib->active)
119 pm8xxx_vib_set(vib, false);
120}
121
122/**
123 * pm8xxx_vib_play_effect - function to handle vib effects.
124 * @dev: input device pointer
125 * @data: data of effect
126 * @effect: effect to play
127 *
128 * Currently this driver supports only rumble effects.
129 */
130static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data,
131 struct ff_effect *effect)
132{
133 struct pm8xxx_vib *vib = input_get_drvdata(dev);
134
135 vib->speed = effect->u.rumble.strong_magnitude >> 8;
136 if (!vib->speed)
137 vib->speed = effect->u.rumble.weak_magnitude >> 9;
138
139 schedule_work(&vib->work);
140
141 return 0;
142}
143
144static int pm8xxx_vib_probe(struct platform_device *pdev)
145
146{
147 struct pm8xxx_vib *vib;
148 struct input_dev *input_dev;
149 int error;
150 unsigned int val;
151
152 vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
153 if (!vib)
154 return -ENOMEM;
155
156 vib->regmap = dev_get_regmap(pdev->dev.parent, NULL);
157 if (!vib->regmap)
158 return -ENODEV;
159
160 input_dev = devm_input_allocate_device(&pdev->dev);
161 if (!input_dev)
162 return -ENOMEM;
163
164 INIT_WORK(&vib->work, pm8xxx_work_handler);
165 vib->vib_input_dev = input_dev;
166
167 /* operate in manual mode */
168 error = regmap_read(vib->regmap, VIB_DRV, &val);
169 if (error < 0)
170 return error;
171
172 val &= ~VIB_DRV_EN_MANUAL_MASK;
173 error = regmap_write(vib->regmap, VIB_DRV, val);
174 if (error < 0)
175 return error;
176
177 vib->reg_vib_drv = val;
178
179 input_dev->name = "pm8xxx_vib_ffmemless";
180 input_dev->id.version = 1;
181 input_dev->close = pm8xxx_vib_close;
182 input_set_drvdata(input_dev, vib);
183 input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);
184
185 error = input_ff_create_memless(input_dev, NULL,
186 pm8xxx_vib_play_effect);
187 if (error) {
188 dev_err(&pdev->dev,
189 "couldn't register vibrator as FF device\n");
190 return error;
191 }
192
193 error = input_register_device(input_dev);
194 if (error) {
195 dev_err(&pdev->dev, "couldn't register input device\n");
196 return error;
197 }
198
199 platform_set_drvdata(pdev, vib);
200 return 0;
201}
202
203#ifdef CONFIG_PM_SLEEP
204static int pm8xxx_vib_suspend(struct device *dev)
205{
206 struct pm8xxx_vib *vib = dev_get_drvdata(dev);
207
208 /* Turn off the vibrator */
209 pm8xxx_vib_set(vib, false);
210
211 return 0;
212}
213#endif
214
215static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);
216
217static struct platform_driver pm8xxx_vib_driver = {
218 .probe = pm8xxx_vib_probe,
219 .driver = {
220 .name = "pm8xxx-vib",
221 .owner = THIS_MODULE,
222 .pm = &pm8xxx_vib_pm_ops,
223 },
224};
225module_platform_driver(pm8xxx_vib_driver);
226
227MODULE_ALIAS("platform:pm8xxx_vib");
228MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework");
229MODULE_LICENSE("GPL v2");
230MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>");