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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 = container_of(work, struct 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 .owner = THIS_MODULE,
251 .pm = PCAP_TS_PM_OPS,
252 },
253};
254module_platform_driver(pcap_ts_driver);
255
256MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
257MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
258MODULE_LICENSE("GPL");
259MODULE_ALIAS("platform:pcap_ts");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform.
4 *
5 * Copyright (C) 2006 Harald Welte <laforge@openezx.org>
6 * Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
7 */
8
9#include <linux/module.h>
10#include <linux/fs.h>
11#include <linux/string.h>
12#include <linux/slab.h>
13#include <linux/pm.h>
14#include <linux/timer.h>
15#include <linux/interrupt.h>
16#include <linux/platform_device.h>
17#include <linux/input.h>
18#include <linux/mfd/ezx-pcap.h>
19
20struct pcap_ts {
21 struct pcap_chip *pcap;
22 struct input_dev *input;
23 struct delayed_work work;
24 u16 x, y;
25 u16 pressure;
26 u8 read_state;
27};
28
29#define SAMPLE_DELAY 20 /* msecs */
30
31#define X_AXIS_MIN 0
32#define X_AXIS_MAX 1023
33#define Y_AXIS_MAX X_AXIS_MAX
34#define Y_AXIS_MIN X_AXIS_MIN
35#define PRESSURE_MAX X_AXIS_MAX
36#define PRESSURE_MIN X_AXIS_MIN
37
38static void pcap_ts_read_xy(void *data, u16 res[2])
39{
40 struct pcap_ts *pcap_ts = data;
41
42 switch (pcap_ts->read_state) {
43 case PCAP_ADC_TS_M_PRESSURE:
44 /* pressure reading is unreliable */
45 if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX)
46 pcap_ts->pressure = res[0];
47 pcap_ts->read_state = PCAP_ADC_TS_M_XY;
48 schedule_delayed_work(&pcap_ts->work, 0);
49 break;
50 case PCAP_ADC_TS_M_XY:
51 pcap_ts->y = res[0];
52 pcap_ts->x = res[1];
53 if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||
54 pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {
55 /* pen has been released */
56 input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);
57 input_report_key(pcap_ts->input, BTN_TOUCH, 0);
58
59 pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
60 schedule_delayed_work(&pcap_ts->work, 0);
61 } else {
62 /* pen is touching the screen */
63 input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);
64 input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);
65 input_report_key(pcap_ts->input, BTN_TOUCH, 1);
66 input_report_abs(pcap_ts->input, ABS_PRESSURE,
67 pcap_ts->pressure);
68
69 /* switch back to pressure read mode */
70 pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
71 schedule_delayed_work(&pcap_ts->work,
72 msecs_to_jiffies(SAMPLE_DELAY));
73 }
74 input_sync(pcap_ts->input);
75 break;
76 default:
77 dev_warn(&pcap_ts->input->dev,
78 "pcap_ts: Warning, unhandled read_state %d\n",
79 pcap_ts->read_state);
80 break;
81 }
82}
83
84static void pcap_ts_work(struct work_struct *work)
85{
86 struct delayed_work *dw = to_delayed_work(work);
87 struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work);
88 u8 ch[2];
89
90 pcap_set_ts_bits(pcap_ts->pcap,
91 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
92
93 if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY)
94 return;
95
96 /* start adc conversion */
97 ch[0] = PCAP_ADC_CH_TS_X1;
98 ch[1] = PCAP_ADC_CH_TS_Y1;
99 pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch,
100 pcap_ts_read_xy, pcap_ts);
101}
102
103static irqreturn_t pcap_ts_event_touch(int pirq, void *data)
104{
105 struct pcap_ts *pcap_ts = data;
106
107 if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {
108 pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
109 schedule_delayed_work(&pcap_ts->work, 0);
110 }
111 return IRQ_HANDLED;
112}
113
114static int pcap_ts_open(struct input_dev *dev)
115{
116 struct pcap_ts *pcap_ts = input_get_drvdata(dev);
117
118 pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
119 schedule_delayed_work(&pcap_ts->work, 0);
120
121 return 0;
122}
123
124static void pcap_ts_close(struct input_dev *dev)
125{
126 struct pcap_ts *pcap_ts = input_get_drvdata(dev);
127
128 cancel_delayed_work_sync(&pcap_ts->work);
129
130 pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
131 pcap_set_ts_bits(pcap_ts->pcap,
132 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
133}
134
135static int pcap_ts_probe(struct platform_device *pdev)
136{
137 struct input_dev *input_dev;
138 struct pcap_ts *pcap_ts;
139 int err = -ENOMEM;
140
141 pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);
142 if (!pcap_ts)
143 return err;
144
145 pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent);
146 platform_set_drvdata(pdev, pcap_ts);
147
148 input_dev = input_allocate_device();
149 if (!input_dev)
150 goto fail;
151
152 INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work);
153
154 pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
155 pcap_set_ts_bits(pcap_ts->pcap,
156 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
157
158 pcap_ts->input = input_dev;
159 input_set_drvdata(input_dev, pcap_ts);
160
161 input_dev->name = "pcap-touchscreen";
162 input_dev->phys = "pcap_ts/input0";
163 input_dev->id.bustype = BUS_HOST;
164 input_dev->id.vendor = 0x0001;
165 input_dev->id.product = 0x0002;
166 input_dev->id.version = 0x0100;
167 input_dev->dev.parent = &pdev->dev;
168 input_dev->open = pcap_ts_open;
169 input_dev->close = pcap_ts_close;
170
171 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
172 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
173 input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
174 input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
175 input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
176 PRESSURE_MAX, 0, 0);
177
178 err = input_register_device(pcap_ts->input);
179 if (err)
180 goto fail_allocate;
181
182 err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),
183 pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);
184 if (err)
185 goto fail_register;
186
187 return 0;
188
189fail_register:
190 input_unregister_device(input_dev);
191 goto fail;
192fail_allocate:
193 input_free_device(input_dev);
194fail:
195 kfree(pcap_ts);
196
197 return err;
198}
199
200static void pcap_ts_remove(struct platform_device *pdev)
201{
202 struct pcap_ts *pcap_ts = platform_get_drvdata(pdev);
203
204 free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts);
205 cancel_delayed_work_sync(&pcap_ts->work);
206
207 input_unregister_device(pcap_ts->input);
208
209 kfree(pcap_ts);
210}
211
212#ifdef CONFIG_PM
213static int pcap_ts_suspend(struct device *dev)
214{
215 struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
216
217 pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR);
218 return 0;
219}
220
221static int pcap_ts_resume(struct device *dev)
222{
223 struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
224
225 pcap_set_ts_bits(pcap_ts->pcap,
226 pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
227 return 0;
228}
229
230static const struct dev_pm_ops pcap_ts_pm_ops = {
231 .suspend = pcap_ts_suspend,
232 .resume = pcap_ts_resume,
233};
234#define PCAP_TS_PM_OPS (&pcap_ts_pm_ops)
235#else
236#define PCAP_TS_PM_OPS NULL
237#endif
238
239static struct platform_driver pcap_ts_driver = {
240 .probe = pcap_ts_probe,
241 .remove_new = pcap_ts_remove,
242 .driver = {
243 .name = "pcap-ts",
244 .pm = PCAP_TS_PM_OPS,
245 },
246};
247module_platform_driver(pcap_ts_driver);
248
249MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
250MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
251MODULE_LICENSE("GPL");
252MODULE_ALIAS("platform:pcap_ts");