1/*
2 * Arizona haptics driver
3 *
4 * Copyright 2012 Wolfson Microelectronics plc
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/input.h>
16#include <linux/slab.h>
17
18#include <sound/soc.h>
19#include <sound/soc-dapm.h>
20
21#include <linux/mfd/arizona/core.h>
22#include <linux/mfd/arizona/pdata.h>
23#include <linux/mfd/arizona/registers.h>
24
25struct arizona_haptics {
26	struct arizona *arizona;
27	struct input_dev *input_dev;
28	struct work_struct work;
29
30	struct mutex mutex;
31	u8 intensity;
32};
33
34static void arizona_haptics_work(struct work_struct *work)
35{
36	struct arizona_haptics *haptics = container_of(work,
37						       struct arizona_haptics,
38						       work);
39	struct arizona *arizona = haptics->arizona;
40	int ret;
41
42	if (!haptics->arizona->dapm) {
43		dev_err(arizona->dev, "No DAPM context\n");
44		return;
45	}
46
47	if (haptics->intensity) {
48		ret = regmap_update_bits(arizona->regmap,
49					 ARIZONA_HAPTICS_PHASE_2_INTENSITY,
50					 ARIZONA_PHASE2_INTENSITY_MASK,
51					 haptics->intensity);
52		if (ret != 0) {
53			dev_err(arizona->dev, "Failed to set intensity: %d\n",
54				ret);
55			return;
56		}
57
58		/* This enable sequence will be a noop if already enabled */
59		ret = regmap_update_bits(arizona->regmap,
60					 ARIZONA_HAPTICS_CONTROL_1,
61					 ARIZONA_HAP_CTRL_MASK,
62					 1 << ARIZONA_HAP_CTRL_SHIFT);
63		if (ret != 0) {
64			dev_err(arizona->dev, "Failed to start haptics: %d\n",
65				ret);
66			return;
67		}
68
69		ret = snd_soc_dapm_enable_pin(arizona->dapm, "HAPTICS");
70		if (ret != 0) {
71			dev_err(arizona->dev, "Failed to start HAPTICS: %d\n",
72				ret);
73			return;
74		}
75
76		ret = snd_soc_dapm_sync(arizona->dapm);
77		if (ret != 0) {
78			dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
79				ret);
80			return;
81		}
82	} else {
83		/* This disable sequence will be a noop if already enabled */
84		ret = snd_soc_dapm_disable_pin(arizona->dapm, "HAPTICS");
85		if (ret != 0) {
86			dev_err(arizona->dev, "Failed to disable HAPTICS: %d\n",
87				ret);
88			return;
89		}
90
91		ret = snd_soc_dapm_sync(arizona->dapm);
92		if (ret != 0) {
93			dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
94				ret);
95			return;
96		}
97
98		ret = regmap_update_bits(arizona->regmap,
99					 ARIZONA_HAPTICS_CONTROL_1,
100					 ARIZONA_HAP_CTRL_MASK, 0);
101		if (ret != 0) {
102			dev_err(arizona->dev, "Failed to stop haptics: %d\n",
103				ret);
104			return;
105		}
106	}
107}
108
109static int arizona_haptics_play(struct input_dev *input, void *data,
110				struct ff_effect *effect)
111{
112	struct arizona_haptics *haptics = input_get_drvdata(input);
113	struct arizona *arizona = haptics->arizona;
114
115	if (!arizona->dapm) {
116		dev_err(arizona->dev, "No DAPM context\n");
117		return -EBUSY;
118	}
119
120	if (effect->u.rumble.strong_magnitude) {
121		/* Scale the magnitude into the range the device supports */
122		if (arizona->pdata.hap_act) {
123			haptics->intensity =
124				effect->u.rumble.strong_magnitude >> 9;
125			if (effect->direction < 0x8000)
126				haptics->intensity += 0x7f;
127		} else {
128			haptics->intensity =
129				effect->u.rumble.strong_magnitude >> 8;
130		}
131	} else {
132		haptics->intensity = 0;
133	}
134
135	schedule_work(&haptics->work);
136
137	return 0;
138}
139
140static void arizona_haptics_close(struct input_dev *input)
141{
142	struct arizona_haptics *haptics = input_get_drvdata(input);
143
144	cancel_work_sync(&haptics->work);
145
146	if (haptics->arizona->dapm)
147		snd_soc_dapm_disable_pin(haptics->arizona->dapm, "HAPTICS");
148}
149
150static int arizona_haptics_probe(struct platform_device *pdev)
151{
152	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
153	struct arizona_haptics *haptics;
154	int ret;
155
156	haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
157	if (!haptics)
158		return -ENOMEM;
159
160	haptics->arizona = arizona;
161
162	ret = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
163				 ARIZONA_HAP_ACT, arizona->pdata.hap_act);
164	if (ret != 0) {
165		dev_err(arizona->dev, "Failed to set haptics actuator: %d\n",
166			ret);
167		return ret;
168	}
169
170	INIT_WORK(&haptics->work, arizona_haptics_work);
171
172	haptics->input_dev = devm_input_allocate_device(&pdev->dev);
173	if (!haptics->input_dev) {
174		dev_err(arizona->dev, "Failed to allocate input device\n");
175		return -ENOMEM;
176	}
177
178	input_set_drvdata(haptics->input_dev, haptics);
179
180	haptics->input_dev->name = "arizona:haptics";
181	haptics->input_dev->dev.parent = pdev->dev.parent;
182	haptics->input_dev->close = arizona_haptics_close;
183	__set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
184
185	ret = input_ff_create_memless(haptics->input_dev, NULL,
186				      arizona_haptics_play);
187	if (ret < 0) {
188		dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
189			ret);
190		return ret;
191	}
192
193	ret = input_register_device(haptics->input_dev);
194	if (ret < 0) {
195		dev_err(arizona->dev, "couldn't register input device: %d\n",
196			ret);
197		return ret;
198	}
199
200	platform_set_drvdata(pdev, haptics);
201
202	return 0;
203}
204
205static struct platform_driver arizona_haptics_driver = {
206	.probe		= arizona_haptics_probe,
207	.driver		= {
208		.name	= "arizona-haptics",
209	},
210};
211module_platform_driver(arizona_haptics_driver);
212
213MODULE_ALIAS("platform:arizona-haptics");
214MODULE_DESCRIPTION("Arizona haptics driver");
215MODULE_LICENSE("GPL");
216MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
217