arizona-haptics.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Arizona haptics driver
  4 *
  5 * Copyright 2012 Wolfson Microelectronics plc
  6 *
  7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/platform_device.h>
 12#include <linux/input.h>
 13#include <linux/slab.h>
 14
 15#include <sound/soc.h>
 16#include <sound/soc-dapm.h>
 17
 18#include <linux/mfd/arizona/core.h>
 19#include <linux/mfd/arizona/pdata.h>
 20#include <linux/mfd/arizona/registers.h>
 21
 22struct arizona_haptics {
 23	struct arizona *arizona;
 24	struct input_dev *input_dev;
 25	struct work_struct work;
 26
 27	struct mutex mutex;
 28	u8 intensity;
 29};
 30
 31static void arizona_haptics_work(struct work_struct *work)
 32{
 33	struct arizona_haptics *haptics = container_of(work,
 34						       struct arizona_haptics,
 35						       work);
 36	struct arizona *arizona = haptics->arizona;
 37	int ret;
 38
 39	if (!haptics->arizona->dapm) {
 40		dev_err(arizona->dev, "No DAPM context\n");
 41		return;
 42	}
 43
 44	if (haptics->intensity) {
 45		ret = regmap_update_bits(arizona->regmap,
 46					 ARIZONA_HAPTICS_PHASE_2_INTENSITY,
 47					 ARIZONA_PHASE2_INTENSITY_MASK,
 48					 haptics->intensity);
 49		if (ret != 0) {
 50			dev_err(arizona->dev, "Failed to set intensity: %d\n",
 51				ret);
 52			return;
 53		}
 54
 55		/* This enable sequence will be a noop if already enabled */
 56		ret = regmap_update_bits(arizona->regmap,
 57					 ARIZONA_HAPTICS_CONTROL_1,
 58					 ARIZONA_HAP_CTRL_MASK,
 59					 1 << ARIZONA_HAP_CTRL_SHIFT);
 60		if (ret != 0) {
 61			dev_err(arizona->dev, "Failed to start haptics: %d\n",
 62				ret);
 63			return;
 64		}
 65
 66		ret = snd_soc_dapm_enable_pin(arizona->dapm, "HAPTICS");
 67		if (ret != 0) {
 68			dev_err(arizona->dev, "Failed to start HAPTICS: %d\n",
 69				ret);
 70			return;
 71		}
 72
 73		ret = snd_soc_dapm_sync(arizona->dapm);
 74		if (ret != 0) {
 75			dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
 76				ret);
 77			return;
 78		}
 79	} else {
 80		/* This disable sequence will be a noop if already enabled */
 81		ret = snd_soc_dapm_disable_pin(arizona->dapm, "HAPTICS");
 82		if (ret != 0) {
 83			dev_err(arizona->dev, "Failed to disable HAPTICS: %d\n",
 84				ret);
 85			return;
 86		}
 87
 88		ret = snd_soc_dapm_sync(arizona->dapm);
 89		if (ret != 0) {
 90			dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
 91				ret);
 92			return;
 93		}
 94
 95		ret = regmap_update_bits(arizona->regmap,
 96					 ARIZONA_HAPTICS_CONTROL_1,
 97					 ARIZONA_HAP_CTRL_MASK, 0);
 98		if (ret != 0) {
 99			dev_err(arizona->dev, "Failed to stop haptics: %d\n",
100				ret);
101			return;
102		}
103	}
104}
105
106static int arizona_haptics_play(struct input_dev *input, void *data,
107				struct ff_effect *effect)
108{
109	struct arizona_haptics *haptics = input_get_drvdata(input);
110	struct arizona *arizona = haptics->arizona;
111
112	if (!arizona->dapm) {
113		dev_err(arizona->dev, "No DAPM context\n");
114		return -EBUSY;
115	}
116
117	if (effect->u.rumble.strong_magnitude) {
118		/* Scale the magnitude into the range the device supports */
119		if (arizona->pdata.hap_act) {
120			haptics->intensity =
121				effect->u.rumble.strong_magnitude >> 9;
122			if (effect->direction < 0x8000)
123				haptics->intensity += 0x7f;
124		} else {
125			haptics->intensity =
126				effect->u.rumble.strong_magnitude >> 8;
127		}
128	} else {
129		haptics->intensity = 0;
130	}
131
132	schedule_work(&haptics->work);
133
134	return 0;
135}
136
137static void arizona_haptics_close(struct input_dev *input)
138{
139	struct arizona_haptics *haptics = input_get_drvdata(input);
140	struct snd_soc_dapm_context *dapm = haptics->arizona->dapm;
141
142	cancel_work_sync(&haptics->work);
143
144	if (dapm)
145		snd_soc_dapm_disable_pin(dapm, "HAPTICS");
146}
147
148static int arizona_haptics_probe(struct platform_device *pdev)
149{
150	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
151	struct arizona_haptics *haptics;
152	int ret;
153
154	haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
155	if (!haptics)
156		return -ENOMEM;
157
158	haptics->arizona = arizona;
159
160	ret = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
161				 ARIZONA_HAP_ACT, arizona->pdata.hap_act);
162	if (ret != 0) {
163		dev_err(arizona->dev, "Failed to set haptics actuator: %d\n",
164			ret);
165		return ret;
166	}
167
168	INIT_WORK(&haptics->work, arizona_haptics_work);
169
170	haptics->input_dev = devm_input_allocate_device(&pdev->dev);
171	if (!haptics->input_dev) {
172		dev_err(arizona->dev, "Failed to allocate input device\n");
173		return -ENOMEM;
174	}
175
176	input_set_drvdata(haptics->input_dev, haptics);
177
178	haptics->input_dev->name = "arizona:haptics";
179	haptics->input_dev->close = arizona_haptics_close;
180	__set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
181
182	ret = input_ff_create_memless(haptics->input_dev, NULL,
183				      arizona_haptics_play);
184	if (ret < 0) {
185		dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
186			ret);
187		return ret;
188	}
189
190	ret = input_register_device(haptics->input_dev);
191	if (ret < 0) {
192		dev_err(arizona->dev, "couldn't register input device: %d\n",
193			ret);
194		return ret;
195	}
196
197	return 0;
198}
199
200static struct platform_driver arizona_haptics_driver = {
201	.probe		= arizona_haptics_probe,
202	.driver		= {
203		.name	= "arizona-haptics",
204	},
205};
206module_platform_driver(arizona_haptics_driver);
207
208MODULE_ALIAS("platform:arizona-haptics");
209MODULE_DESCRIPTION("Arizona haptics driver");
210MODULE_LICENSE("GPL");
211MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");