1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * twl4030-vibra.c - TWL4030 Vibrator driver
4 *
5 * Copyright (C) 2008-2010 Nokia Corporation
6 *
7 * Written by Henrik Saari <henrik.saari@nokia.com>
8 * Updates by Felipe Balbi <felipe.balbi@nokia.com>
9 * Input by Jari Vanhala <ext-jari.vanhala@nokia.com>
10 */
11
12#include <linux/module.h>
13#include <linux/jiffies.h>
14#include <linux/platform_device.h>
15#include <linux/of.h>
16#include <linux/workqueue.h>
17#include <linux/mfd/twl.h>
18#include <linux/mfd/twl4030-audio.h>
19#include <linux/input.h>
20#include <linux/slab.h>
21
22/* MODULE ID2 */
23#define LEDEN 0x00
24
25/* ForceFeedback */
26#define EFFECT_DIR_180_DEG 0x8000 /* range is 0 - 0xFFFF */
27
28struct vibra_info {
29 struct device *dev;
30 struct input_dev *input_dev;
31
32 struct work_struct play_work;
33
34 bool enabled;
35 int speed;
36 int direction;
37
38 bool coexist;
39};
40
41static void vibra_disable_leds(void)
42{
43 u8 reg;
44
45 /* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
46 twl_i2c_read_u8(TWL4030_MODULE_LED, val: &reg, LEDEN);
47 reg &= ~0x03;
48 twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
49}
50
51/* Powers H-Bridge and enables audio clk */
52static void vibra_enable(struct vibra_info *info)
53{
54 u8 reg;
55
56 twl4030_audio_enable_resource(id: TWL4030_AUDIO_RES_POWER);
57
58 /* turn H-Bridge on */
59 twl_i2c_read_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
60 val: &reg, TWL4030_REG_VIBRA_CTL);
61 twl_i2c_write_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
62 val: (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
63
64 twl4030_audio_enable_resource(id: TWL4030_AUDIO_RES_APLL);
65
66 info->enabled = true;
67}
68
69static void vibra_disable(struct vibra_info *info)
70{
71 u8 reg;
72
73 /* Power down H-Bridge */
74 twl_i2c_read_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
75 val: &reg, TWL4030_REG_VIBRA_CTL);
76 twl_i2c_write_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
77 val: (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
78
79 twl4030_audio_disable_resource(id: TWL4030_AUDIO_RES_APLL);
80 twl4030_audio_disable_resource(id: TWL4030_AUDIO_RES_POWER);
81
82 info->enabled = false;
83}
84
85static void vibra_play_work(struct work_struct *work)
86{
87 struct vibra_info *info = container_of(work,
88 struct vibra_info, play_work);
89 int dir;
90 int pwm;
91 u8 reg;
92
93 dir = info->direction;
94 pwm = info->speed;
95
96 twl_i2c_read_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
97 val: &reg, TWL4030_REG_VIBRA_CTL);
98 if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
99
100 if (!info->enabled)
101 vibra_enable(info);
102
103 /* set vibra rotation direction */
104 twl_i2c_read_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
105 val: &reg, TWL4030_REG_VIBRA_CTL);
106 reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
107 (reg & ~TWL4030_VIBRA_DIR);
108 twl_i2c_write_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
109 val: reg, TWL4030_REG_VIBRA_CTL);
110
111 /* set PWM, 1 = max, 255 = min */
112 twl_i2c_write_u8(mod_no: TWL4030_MODULE_AUDIO_VOICE,
113 val: 256 - pwm, TWL4030_REG_VIBRA_SET);
114 } else {
115 if (info->enabled)
116 vibra_disable(info);
117 }
118}
119
120/*** Input/ForceFeedback ***/
121
122static int vibra_play(struct input_dev *input, void *data,
123 struct ff_effect *effect)
124{
125 struct vibra_info *info = input_get_drvdata(dev: input);
126
127 info->speed = effect->u.rumble.strong_magnitude >> 8;
128 if (!info->speed)
129 info->speed = effect->u.rumble.weak_magnitude >> 9;
130 info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
131 schedule_work(work: &info->play_work);
132 return 0;
133}
134
135static void twl4030_vibra_close(struct input_dev *input)
136{
137 struct vibra_info *info = input_get_drvdata(dev: input);
138
139 cancel_work_sync(work: &info->play_work);
140
141 if (info->enabled)
142 vibra_disable(info);
143}
144
145/*** Module ***/
146static int twl4030_vibra_suspend(struct device *dev)
147{
148 struct platform_device *pdev = to_platform_device(dev);
149 struct vibra_info *info = platform_get_drvdata(pdev);
150
151 if (info->enabled)
152 vibra_disable(info);
153
154 return 0;
155}
156
157static int twl4030_vibra_resume(struct device *dev)
158{
159 vibra_disable_leds();
160 return 0;
161}
162
163static DEFINE_SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
164 twl4030_vibra_suspend, twl4030_vibra_resume);
165
166static bool twl4030_vibra_check_coexist(struct device_node *parent)
167{
168 struct device_node *node __free(device_node) =
169 of_get_child_by_name(node: parent, name: "codec");
170
171 return node != NULL;
172}
173
174static int twl4030_vibra_probe(struct platform_device *pdev)
175{
176 struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
177 struct vibra_info *info;
178 int ret;
179
180 if (!twl4030_core_node) {
181 dev_dbg(&pdev->dev, "twl4030 OF node is missing\n");
182 return -EINVAL;
183 }
184
185 info = devm_kzalloc(dev: &pdev->dev, size: sizeof(*info), GFP_KERNEL);
186 if (!info)
187 return -ENOMEM;
188
189 info->dev = &pdev->dev;
190 info->coexist = twl4030_vibra_check_coexist(parent: twl4030_core_node);
191 INIT_WORK(&info->play_work, vibra_play_work);
192
193 info->input_dev = devm_input_allocate_device(&pdev->dev);
194 if (info->input_dev == NULL) {
195 dev_err(&pdev->dev, "couldn't allocate input device\n");
196 return -ENOMEM;
197 }
198
199 input_set_drvdata(dev: info->input_dev, data: info);
200
201 info->input_dev->name = "twl4030:vibrator";
202 info->input_dev->id.version = 1;
203 info->input_dev->close = twl4030_vibra_close;
204 __set_bit(FF_RUMBLE, info->input_dev->ffbit);
205
206 ret = input_ff_create_memless(dev: info->input_dev, NULL, play_effect: vibra_play);
207 if (ret < 0) {
208 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
209 return ret;
210 }
211
212 ret = input_register_device(info->input_dev);
213 if (ret < 0) {
214 dev_dbg(&pdev->dev, "couldn't register input device\n");
215 goto err_iff;
216 }
217
218 vibra_disable_leds();
219
220 platform_set_drvdata(pdev, data: info);
221 return 0;
222
223err_iff:
224 input_ff_destroy(dev: info->input_dev);
225 return ret;
226}
227
228static struct platform_driver twl4030_vibra_driver = {
229 .probe = twl4030_vibra_probe,
230 .driver = {
231 .name = "twl4030-vibra",
232 .pm = pm_sleep_ptr(&twl4030_vibra_pm_ops),
233 },
234};
235module_platform_driver(twl4030_vibra_driver);
236
237MODULE_ALIAS("platform:twl4030-vibra");
238MODULE_DESCRIPTION("TWL4030 Vibra driver");
239MODULE_LICENSE("GPL");
240MODULE_AUTHOR("Nokia Corporation");
241

source code of linux/drivers/input/misc/twl4030-vibra.c