include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6.git] / drivers / input / touchscreen / pcap_ts.c
1 /*
2  * Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform.
3  *
4  *  Copyright (C) 2006 Harald Welte <laforge@openezx.org>
5  *  Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License version 2 as
9  *  published by the Free Software Foundation.
10  *
11  */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/fs.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/pm.h>
19 #include <linux/timer.h>
20 #include <linux/interrupt.h>
21 #include <linux/platform_device.h>
22 #include <linux/input.h>
23 #include <linux/mfd/ezx-pcap.h>
24
25 struct pcap_ts {
26         struct pcap_chip *pcap;
27         struct input_dev *input;
28         struct delayed_work work;
29         u16 x, y;
30         u16 pressure;
31         u8 read_state;
32 };
33
34 #define SAMPLE_DELAY    20 /* msecs */
35
36 #define X_AXIS_MIN      0
37 #define X_AXIS_MAX      1023
38 #define Y_AXIS_MAX      X_AXIS_MAX
39 #define Y_AXIS_MIN      X_AXIS_MIN
40 #define PRESSURE_MAX    X_AXIS_MAX
41 #define PRESSURE_MIN    X_AXIS_MIN
42
43 static void pcap_ts_read_xy(void *data, u16 res[2])
44 {
45         struct pcap_ts *pcap_ts = data;
46
47         switch (pcap_ts->read_state) {
48         case PCAP_ADC_TS_M_PRESSURE:
49                 /* pressure reading is unreliable */
50                 if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX)
51                         pcap_ts->pressure = res[0];
52                 pcap_ts->read_state = PCAP_ADC_TS_M_XY;
53                 schedule_delayed_work(&pcap_ts->work, 0);
54                 break;
55         case PCAP_ADC_TS_M_XY:
56                 pcap_ts->y = res[0];
57                 pcap_ts->x = res[1];
58                 if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||
59                     pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {
60                         /* pen has been released */
61                         input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);
62                         input_report_key(pcap_ts->input, BTN_TOUCH, 0);
63
64                         pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
65                         schedule_delayed_work(&pcap_ts->work, 0);
66                 } else {
67                         /* pen is touching the screen */
68                         input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);
69                         input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);
70                         input_report_key(pcap_ts->input, BTN_TOUCH, 1);
71                         input_report_abs(pcap_ts->input, ABS_PRESSURE,
72                                                 pcap_ts->pressure);
73
74                         /* switch back to pressure read mode */
75                         pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
76                         schedule_delayed_work(&pcap_ts->work,
77                                         msecs_to_jiffies(SAMPLE_DELAY));
78                 }
79                 input_sync(pcap_ts->input);
80                 break;
81         default:
82                 dev_warn(&pcap_ts->input->dev,
83                                 "pcap_ts: Warning, unhandled read_state %d\n",
84                                 pcap_ts->read_state);
85                 break;
86         }
87 }
88
89 static void pcap_ts_work(struct work_struct *work)
90 {
91         struct delayed_work *dw = container_of(work, struct delayed_work, work);
92         struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work);
93         u8 ch[2];
94
95         pcap_set_ts_bits(pcap_ts->pcap,
96                         pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
97
98         if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY)
99                 return;
100
101         /* start adc conversion */
102         ch[0] = PCAP_ADC_CH_TS_X1;
103         ch[1] = PCAP_ADC_CH_TS_Y1;
104         pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch,
105                                                 pcap_ts_read_xy, pcap_ts);
106 }
107
108 static irqreturn_t pcap_ts_event_touch(int pirq, void *data)
109 {
110         struct pcap_ts *pcap_ts = data;
111
112         if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {
113                 pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
114                 schedule_delayed_work(&pcap_ts->work, 0);
115         }
116         return IRQ_HANDLED;
117 }
118
119 static int pcap_ts_open(struct input_dev *dev)
120 {
121         struct pcap_ts *pcap_ts = input_get_drvdata(dev);
122
123         pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
124         schedule_delayed_work(&pcap_ts->work, 0);
125
126         return 0;
127 }
128
129 static void pcap_ts_close(struct input_dev *dev)
130 {
131         struct pcap_ts *pcap_ts = input_get_drvdata(dev);
132
133         cancel_delayed_work_sync(&pcap_ts->work);
134
135         pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
136         pcap_set_ts_bits(pcap_ts->pcap,
137                                 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
138 }
139
140 static int __devinit pcap_ts_probe(struct platform_device *pdev)
141 {
142         struct input_dev *input_dev;
143         struct pcap_ts *pcap_ts;
144         int err = -ENOMEM;
145
146         pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);
147         if (!pcap_ts)
148                 return err;
149
150         pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent);
151         platform_set_drvdata(pdev, pcap_ts);
152
153         input_dev = input_allocate_device();
154         if (!input_dev)
155                 goto fail;
156
157         INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work);
158
159         pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
160         pcap_set_ts_bits(pcap_ts->pcap,
161                                 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
162
163         pcap_ts->input = input_dev;
164         input_set_drvdata(input_dev, pcap_ts);
165
166         input_dev->name = "pcap-touchscreen";
167         input_dev->phys = "pcap_ts/input0";
168         input_dev->id.bustype = BUS_HOST;
169         input_dev->id.vendor = 0x0001;
170         input_dev->id.product = 0x0002;
171         input_dev->id.version = 0x0100;
172         input_dev->dev.parent = &pdev->dev;
173         input_dev->open = pcap_ts_open;
174         input_dev->close = pcap_ts_close;
175
176         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
177         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
178         input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
179         input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
180         input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
181                              PRESSURE_MAX, 0, 0);
182
183         err = input_register_device(pcap_ts->input);
184         if (err)
185                 goto fail_allocate;
186
187         err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),
188                         pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);
189         if (err)
190                 goto fail_register;
191
192         return 0;
193
194 fail_register:
195         input_unregister_device(input_dev);
196         goto fail;
197 fail_allocate:
198         input_free_device(input_dev);
199 fail:
200         kfree(pcap_ts);
201
202         return err;
203 }
204
205 static int __devexit pcap_ts_remove(struct platform_device *pdev)
206 {
207         struct pcap_ts *pcap_ts = platform_get_drvdata(pdev);
208
209         free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts);
210         cancel_delayed_work_sync(&pcap_ts->work);
211
212         input_unregister_device(pcap_ts->input);
213
214         kfree(pcap_ts);
215
216         return 0;
217 }
218
219 #ifdef CONFIG_PM
220 static int pcap_ts_suspend(struct device *dev)
221 {
222         struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
223
224         pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR);
225         return 0;
226 }
227
228 static int pcap_ts_resume(struct device *dev)
229 {
230         struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
231
232         pcap_set_ts_bits(pcap_ts->pcap,
233                                 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
234         return 0;
235 }
236
237 static const struct dev_pm_ops pcap_ts_pm_ops = {
238         .suspend        = pcap_ts_suspend,
239         .resume         = pcap_ts_resume,
240 };
241 #define PCAP_TS_PM_OPS (&pcap_ts_pm_ops)
242 #else
243 #define PCAP_TS_PM_OPS NULL
244 #endif
245
246 static struct platform_driver pcap_ts_driver = {
247         .probe          = pcap_ts_probe,
248         .remove         = __devexit_p(pcap_ts_remove),
249         .driver         = {
250                 .name   = "pcap-ts",
251                 .owner  = THIS_MODULE,
252                 .pm     = PCAP_TS_PM_OPS,
253         },
254 };
255
256 static int __init pcap_ts_init(void)
257 {
258         return platform_driver_register(&pcap_ts_driver);
259 }
260
261 static void __exit pcap_ts_exit(void)
262 {
263         platform_driver_unregister(&pcap_ts_driver);
264 }
265
266 module_init(pcap_ts_init);
267 module_exit(pcap_ts_exit);
268
269 MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
270 MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
271 MODULE_LICENSE("GPL");
272 MODULE_ALIAS("platform:pcap_ts");