Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/input/touchscreen/jornada720_ts.c
4 *
5 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
6 *
7 * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
8 * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
9 *
10 * HP Jornada 710/720/729 Touchscreen Driver
11 */
12
13#include <linux/gpio/consumer.h>
14#include <linux/platform_device.h>
15#include <linux/input.h>
16#include <linux/interrupt.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/io.h>
20
21#include <mach/jornada720.h>
22
23MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
24MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
25MODULE_LICENSE("GPL v2");
26
27struct jornada_ts {
28 struct input_dev *dev;
29 struct gpio_desc *gpio;
30 int x_data[4]; /* X sample values */
31 int y_data[4]; /* Y sample values */
32};
33
34static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
35{
36 /* 3 low word X samples */
37 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
38 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
39 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
40
41 /* 3 low word Y samples */
42 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
43 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
44 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
45
46 /* combined x samples bits */
47 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
48
49 /* combined y samples bits */
50 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
51}
52
53static int jornada720_ts_average(int coords[4])
54{
55 int coord, high_bits = coords[3];
56
57 coord = coords[0] | ((high_bits & 0x03) << 8);
58 coord += coords[1] | ((high_bits & 0x0c) << 6);
59 coord += coords[2] | ((high_bits & 0x30) << 4);
60
61 return coord / 3;
62}
63
64static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
65{
66 struct platform_device *pdev = dev_id;
67 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
68 struct input_dev *input = jornada_ts->dev;
69 int x, y;
70
71 /* If gpio is high then report pen up */
72 if (gpiod_get_value(jornada_ts->gpio)) {
73 input_report_key(input, BTN_TOUCH, 0);
74 input_sync(input);
75 } else {
76 jornada_ssp_start();
77
78 /* proper reply to request is always TXDUMMY */
79 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
80 jornada720_ts_collect_data(jornada_ts);
81
82 x = jornada720_ts_average(jornada_ts->x_data);
83 y = jornada720_ts_average(jornada_ts->y_data);
84
85 input_report_key(input, BTN_TOUCH, 1);
86 input_report_abs(input, ABS_X, x);
87 input_report_abs(input, ABS_Y, y);
88 input_sync(input);
89 }
90
91 jornada_ssp_end();
92 }
93
94 return IRQ_HANDLED;
95}
96
97static int jornada720_ts_probe(struct platform_device *pdev)
98{
99 struct jornada_ts *jornada_ts;
100 struct input_dev *input_dev;
101 int error, irq;
102
103 jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL);
104 if (!jornada_ts)
105 return -ENOMEM;
106
107 input_dev = devm_input_allocate_device(&pdev->dev);
108 if (!input_dev)
109 return -ENOMEM;
110
111 platform_set_drvdata(pdev, jornada_ts);
112
113 jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN);
114 if (IS_ERR(jornada_ts->gpio))
115 return PTR_ERR(jornada_ts->gpio);
116
117 irq = gpiod_to_irq(jornada_ts->gpio);
118 if (irq <= 0)
119 return irq < 0 ? irq : -EINVAL;
120
121 jornada_ts->dev = input_dev;
122
123 input_dev->name = "HP Jornada 7xx Touchscreen";
124 input_dev->phys = "jornadats/input0";
125 input_dev->id.bustype = BUS_HOST;
126 input_dev->dev.parent = &pdev->dev;
127
128 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
129 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
130 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
131 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
132
133 error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt,
134 IRQF_TRIGGER_RISING,
135 "HP7XX Touchscreen driver", pdev);
136 if (error) {
137 dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n");
138 return error;
139 }
140
141 error = input_register_device(jornada_ts->dev);
142 if (error)
143 return error;
144
145 return 0;
146}
147
148/* work with hotplug and coldplug */
149MODULE_ALIAS("platform:jornada_ts");
150
151static struct platform_driver jornada720_ts_driver = {
152 .probe = jornada720_ts_probe,
153 .driver = {
154 .name = "jornada_ts",
155 },
156};
157module_platform_driver(jornada720_ts_driver);
1/*
2 * drivers/input/touchscreen/jornada720_ts.c
3 *
4 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
5 *
6 * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
7 * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * HP Jornada 710/720/729 Touchscreen Driver
14 */
15
16#include <linux/platform_device.h>
17#include <linux/input.h>
18#include <linux/interrupt.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/io.h>
22
23#include <mach/hardware.h>
24#include <mach/jornada720.h>
25#include <mach/irqs.h>
26
27MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
28MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
29MODULE_LICENSE("GPL v2");
30
31struct jornada_ts {
32 struct input_dev *dev;
33 int x_data[4]; /* X sample values */
34 int y_data[4]; /* Y sample values */
35};
36
37static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
38{
39
40 /* 3 low word X samples */
41 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
42 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
43 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
44
45 /* 3 low word Y samples */
46 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
47 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
48 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
49
50 /* combined x samples bits */
51 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
52
53 /* combined y samples bits */
54 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
55}
56
57static int jornada720_ts_average(int coords[4])
58{
59 int coord, high_bits = coords[3];
60
61 coord = coords[0] | ((high_bits & 0x03) << 8);
62 coord += coords[1] | ((high_bits & 0x0c) << 6);
63 coord += coords[2] | ((high_bits & 0x30) << 4);
64
65 return coord / 3;
66}
67
68static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
69{
70 struct platform_device *pdev = dev_id;
71 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
72 struct input_dev *input = jornada_ts->dev;
73 int x, y;
74
75 /* If GPIO_GPIO9 is set to high then report pen up */
76 if (GPLR & GPIO_GPIO(9)) {
77 input_report_key(input, BTN_TOUCH, 0);
78 input_sync(input);
79 } else {
80 jornada_ssp_start();
81
82 /* proper reply to request is always TXDUMMY */
83 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
84 jornada720_ts_collect_data(jornada_ts);
85
86 x = jornada720_ts_average(jornada_ts->x_data);
87 y = jornada720_ts_average(jornada_ts->y_data);
88
89 input_report_key(input, BTN_TOUCH, 1);
90 input_report_abs(input, ABS_X, x);
91 input_report_abs(input, ABS_Y, y);
92 input_sync(input);
93 }
94
95 jornada_ssp_end();
96 }
97
98 return IRQ_HANDLED;
99}
100
101static int jornada720_ts_probe(struct platform_device *pdev)
102{
103 struct jornada_ts *jornada_ts;
104 struct input_dev *input_dev;
105 int error;
106
107 jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
108 input_dev = input_allocate_device();
109
110 if (!jornada_ts || !input_dev) {
111 error = -ENOMEM;
112 goto fail1;
113 }
114
115 platform_set_drvdata(pdev, jornada_ts);
116
117 jornada_ts->dev = input_dev;
118
119 input_dev->name = "HP Jornada 7xx Touchscreen";
120 input_dev->phys = "jornadats/input0";
121 input_dev->id.bustype = BUS_HOST;
122 input_dev->dev.parent = &pdev->dev;
123
124 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
125 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
126 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
127 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
128
129 error = request_irq(IRQ_GPIO9,
130 jornada720_ts_interrupt,
131 IRQF_TRIGGER_RISING,
132 "HP7XX Touchscreen driver", pdev);
133 if (error) {
134 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
135 goto fail1;
136 }
137
138 error = input_register_device(jornada_ts->dev);
139 if (error)
140 goto fail2;
141
142 return 0;
143
144 fail2:
145 free_irq(IRQ_GPIO9, pdev);
146 fail1:
147 input_free_device(input_dev);
148 kfree(jornada_ts);
149 return error;
150}
151
152static int jornada720_ts_remove(struct platform_device *pdev)
153{
154 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
155
156 free_irq(IRQ_GPIO9, pdev);
157 input_unregister_device(jornada_ts->dev);
158 kfree(jornada_ts);
159
160 return 0;
161}
162
163/* work with hotplug and coldplug */
164MODULE_ALIAS("platform:jornada_ts");
165
166static struct platform_driver jornada720_ts_driver = {
167 .probe = jornada720_ts_probe,
168 .remove = jornada720_ts_remove,
169 .driver = {
170 .name = "jornada_ts",
171 .owner = THIS_MODULE,
172 },
173};
174module_platform_driver(jornada720_ts_driver);