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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
23#define LEDEN 0x00
24
25
26#define EFFECT_DIR_180_DEG 0x8000
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
46 twl_i2c_read_u8(TWL4030_MODULE_LED, ®, LEDEN);
47 reg &= ~0x03;
48 twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
49}
50
51
52static void vibra_enable(struct vibra_info *info)
53{
54 u8 reg;
55
56 twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);
57
58
59 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
60 ®, TWL4030_REG_VIBRA_CTL);
61 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
62 (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
63
64 twl4030_audio_enable_resource(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
74 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
75 ®, TWL4030_REG_VIBRA_CTL);
76 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
77 (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
78
79 twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
80 twl4030_audio_disable_resource(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(TWL4030_MODULE_AUDIO_VOICE,
97 ®, TWL4030_REG_VIBRA_CTL);
98 if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
99
100 if (!info->enabled)
101 vibra_enable(info);
102
103
104 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
105 ®, TWL4030_REG_VIBRA_CTL);
106 reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
107 (reg & ~TWL4030_VIBRA_DIR);
108 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
109 reg, TWL4030_REG_VIBRA_CTL);
110
111
112 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
113 256 - pwm, TWL4030_REG_VIBRA_SET);
114 } else {
115 if (info->enabled)
116 vibra_disable(info);
117 }
118}
119
120
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(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(&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(input);
138
139 cancel_work_sync(&info->play_work);
140
141 if (info->enabled)
142 vibra_disable(info);
143}
144
145
146static int __maybe_unused 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 __maybe_unused twl4030_vibra_resume(struct device *dev)
158{
159 vibra_disable_leds();
160 return 0;
161}
162
163static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
164 twl4030_vibra_suspend, twl4030_vibra_resume);
165
166static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
167 struct device_node *parent)
168{
169 struct device_node *node;
170
171 if (pdata && pdata->coexist)
172 return true;
173
174 node = of_get_child_by_name(parent, "codec");
175 if (node) {
176 of_node_put(node);
177 return true;
178 }
179
180 return false;
181}
182
183static int twl4030_vibra_probe(struct platform_device *pdev)
184{
185 struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
186 struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
187 struct vibra_info *info;
188 int ret;
189
190 if (!pdata && !twl4030_core_node) {
191 dev_dbg(&pdev->dev, "platform_data not available\n");
192 return -EINVAL;
193 }
194
195 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
196 if (!info)
197 return -ENOMEM;
198
199 info->dev = &pdev->dev;
200 info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
201 INIT_WORK(&info->play_work, vibra_play_work);
202
203 info->input_dev = devm_input_allocate_device(&pdev->dev);
204 if (info->input_dev == NULL) {
205 dev_err(&pdev->dev, "couldn't allocate input device\n");
206 return -ENOMEM;
207 }
208
209 input_set_drvdata(info->input_dev, info);
210
211 info->input_dev->name = "twl4030:vibrator";
212 info->input_dev->id.version = 1;
213 info->input_dev->close = twl4030_vibra_close;
214 __set_bit(FF_RUMBLE, info->input_dev->ffbit);
215
216 ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
217 if (ret < 0) {
218 dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
219 return ret;
220 }
221
222 ret = input_register_device(info->input_dev);
223 if (ret < 0) {
224 dev_dbg(&pdev->dev, "couldn't register input device\n");
225 goto err_iff;
226 }
227
228 vibra_disable_leds();
229
230 platform_set_drvdata(pdev, info);
231 return 0;
232
233err_iff:
234 input_ff_destroy(info->input_dev);
235 return ret;
236}
237
238static struct platform_driver twl4030_vibra_driver = {
239 .probe = twl4030_vibra_probe,
240 .driver = {
241 .name = "twl4030-vibra",
242 .pm = &twl4030_vibra_pm_ops,
243 },
244};
245module_platform_driver(twl4030_vibra_driver);
246
247MODULE_ALIAS("platform:twl4030-vibra");
248MODULE_DESCRIPTION("TWL4030 Vibra driver");
249MODULE_LICENSE("GPL");
250MODULE_AUTHOR("Nokia Corporation");
251
