1 /*
2  * twl4030-vibra.c - TWL4030 Vibrator driver
3  *
4  * Copyright (C) 2008-2010 Nokia Corporation
5  *
6  * Written by Henrik Saari <henrik.saari@nokia.com>
7  * Updates by Felipe Balbi <felipe.balbi@nokia.com>
8  * Input by Jari Vanhala <ext-jari.vanhala@nokia.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22  * 02110-1301 USA
23  *
24  */
25 
26 #include <linux/module.h>
27 #include <linux/jiffies.h>
28 #include <linux/platform_device.h>
29 #include <linux/of.h>
30 #include <linux/workqueue.h>
31 #include <linux/i2c/twl.h>
32 #include <linux/mfd/twl4030-audio.h>
33 #include <linux/input.h>
34 #include <linux/slab.h>
35 
36 /* MODULE ID2 */
37 #define LEDEN		0x00
38 
39 /* ForceFeedback */
40 #define EFFECT_DIR_180_DEG	0x8000 /* range is 0 - 0xFFFF */
41 
42 struct vibra_info {
43 	struct device		*dev;
44 	struct input_dev	*input_dev;
45 
46 	struct work_struct	play_work;
47 
48 	bool			enabled;
49 	int			speed;
50 	int			direction;
51 
52 	bool			coexist;
53 };
54 
55 static void vibra_disable_leds(void)
56 {
57 	u8 reg;
58 
59 	/* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
60 	twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
61 	reg &= ~0x03;
62 	twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
63 }
64 
65 /* Powers H-Bridge and enables audio clk */
66 static void vibra_enable(struct vibra_info *info)
67 {
68 	u8 reg;
69 
70 	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);
71 
72 	/* turn H-Bridge on */
73 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
74 			&reg, TWL4030_REG_VIBRA_CTL);
75 	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
76 			 (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
77 
78 	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL);
79 
80 	info->enabled = true;
81 }
82 
83 static void vibra_disable(struct vibra_info *info)
84 {
85 	u8 reg;
86 
87 	/* Power down H-Bridge */
88 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
89 			&reg, TWL4030_REG_VIBRA_CTL);
90 	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
91 			 (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);
92 
93 	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
94 	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);
95 
96 	info->enabled = false;
97 }
98 
99 static void vibra_play_work(struct work_struct *work)
100 {
101 	struct vibra_info *info = container_of(work,
102 			struct vibra_info, play_work);
103 	int dir;
104 	int pwm;
105 	u8 reg;
106 
107 	dir = info->direction;
108 	pwm = info->speed;
109 
110 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
111 			&reg, TWL4030_REG_VIBRA_CTL);
112 	if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {
113 
114 		if (!info->enabled)
115 			vibra_enable(info);
116 
117 		/* set vibra rotation direction */
118 		twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
119 				&reg, TWL4030_REG_VIBRA_CTL);
120 		reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
121 			(reg & ~TWL4030_VIBRA_DIR);
122 		twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
123 				 reg, TWL4030_REG_VIBRA_CTL);
124 
125 		/* set PWM, 1 = max, 255 = min */
126 		twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
127 				 256 - pwm, TWL4030_REG_VIBRA_SET);
128 	} else {
129 		if (info->enabled)
130 			vibra_disable(info);
131 	}
132 }
133 
134 /*** Input/ForceFeedback ***/
135 
136 static int vibra_play(struct input_dev *input, void *data,
137 		      struct ff_effect *effect)
138 {
139 	struct vibra_info *info = input_get_drvdata(input);
140 
141 	info->speed = effect->u.rumble.strong_magnitude >> 8;
142 	if (!info->speed)
143 		info->speed = effect->u.rumble.weak_magnitude >> 9;
144 	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
145 	schedule_work(&info->play_work);
146 	return 0;
147 }
148 
149 static void twl4030_vibra_close(struct input_dev *input)
150 {
151 	struct vibra_info *info = input_get_drvdata(input);
152 
153 	cancel_work_sync(&info->play_work);
154 
155 	if (info->enabled)
156 		vibra_disable(info);
157 }
158 
159 /*** Module ***/
160 static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
161 {
162 	struct platform_device *pdev = to_platform_device(dev);
163 	struct vibra_info *info = platform_get_drvdata(pdev);
164 
165 	if (info->enabled)
166 		vibra_disable(info);
167 
168 	return 0;
169 }
170 
171 static int __maybe_unused twl4030_vibra_resume(struct device *dev)
172 {
173 	vibra_disable_leds();
174 	return 0;
175 }
176 
177 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
178 			 twl4030_vibra_suspend, twl4030_vibra_resume);
179 
180 static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
181 			      struct device_node *node)
182 {
183 	if (pdata && pdata->coexist)
184 		return true;
185 
186 	node = of_find_node_by_name(node, "codec");
187 	if (node) {
188 		of_node_put(node);
189 		return true;
190 	}
191 
192 	return false;
193 }
194 
195 static int twl4030_vibra_probe(struct platform_device *pdev)
196 {
197 	struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
198 	struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
199 	struct vibra_info *info;
200 	int ret;
201 
202 	if (!pdata && !twl4030_core_node) {
203 		dev_dbg(&pdev->dev, "platform_data not available\n");
204 		return -EINVAL;
205 	}
206 
207 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
208 	if (!info)
209 		return -ENOMEM;
210 
211 	info->dev = &pdev->dev;
212 	info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
213 	INIT_WORK(&info->play_work, vibra_play_work);
214 
215 	info->input_dev = devm_input_allocate_device(&pdev->dev);
216 	if (info->input_dev == NULL) {
217 		dev_err(&pdev->dev, "couldn't allocate input device\n");
218 		return -ENOMEM;
219 	}
220 
221 	input_set_drvdata(info->input_dev, info);
222 
223 	info->input_dev->name = "twl4030:vibrator";
224 	info->input_dev->id.version = 1;
225 	info->input_dev->dev.parent = pdev->dev.parent;
226 	info->input_dev->close = twl4030_vibra_close;
227 	__set_bit(FF_RUMBLE, info->input_dev->ffbit);
228 
229 	ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
230 	if (ret < 0) {
231 		dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
232 		return ret;
233 	}
234 
235 	ret = input_register_device(info->input_dev);
236 	if (ret < 0) {
237 		dev_dbg(&pdev->dev, "couldn't register input device\n");
238 		goto err_iff;
239 	}
240 
241 	vibra_disable_leds();
242 
243 	platform_set_drvdata(pdev, info);
244 	return 0;
245 
246 err_iff:
247 	input_ff_destroy(info->input_dev);
248 	return ret;
249 }
250 
251 static struct platform_driver twl4030_vibra_driver = {
252 	.probe		= twl4030_vibra_probe,
253 	.driver		= {
254 		.name	= "twl4030-vibra",
255 		.pm	= &twl4030_vibra_pm_ops,
256 	},
257 };
258 module_platform_driver(twl4030_vibra_driver);
259 
260 MODULE_ALIAS("platform:twl4030-vibra");
261 MODULE_DESCRIPTION("TWL4030 Vibra driver");
262 MODULE_LICENSE("GPL");
263 MODULE_AUTHOR("Nokia Corporation");
264