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