1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | #include <linux/input.h> |
3 | #include <linux/module.h> |
4 | #include <linux/init.h> |
5 | #include <linux/interrupt.h> |
6 | #include <asm/io.h> |
7 | #include <asm/delay.h> |
8 | #include <asm/adc.h> |
9 | #include <mach/hp6xx.h> |
10 | |
11 | #define MODNAME "hp680_ts_input" |
12 | |
13 | #define HP680_TS_ABS_X_MIN 40 |
14 | #define HP680_TS_ABS_X_MAX 950 |
15 | #define HP680_TS_ABS_Y_MIN 80 |
16 | #define HP680_TS_ABS_Y_MAX 910 |
17 | |
18 | #define PHDR 0xa400012e |
19 | #define SCPDR 0xa4000136 |
20 | |
21 | static void do_softint(struct work_struct *work); |
22 | |
23 | static struct input_dev *hp680_ts_dev; |
24 | static DECLARE_DELAYED_WORK(work, do_softint); |
25 | |
26 | static void do_softint(struct work_struct *work) |
27 | { |
28 | int absx = 0, absy = 0; |
29 | u8 scpdr; |
30 | int touched = 0; |
31 | |
32 | if (__raw_readb(PHDR) & PHDR_TS_PEN_DOWN) { |
33 | scpdr = __raw_readb(SCPDR); |
34 | scpdr |= SCPDR_TS_SCAN_ENABLE; |
35 | scpdr &= ~SCPDR_TS_SCAN_Y; |
36 | __raw_writeb(val: scpdr, SCPDR); |
37 | udelay(30); |
38 | |
39 | absy = adc_single(ADC_CHANNEL_TS_Y); |
40 | |
41 | scpdr = __raw_readb(SCPDR); |
42 | scpdr |= SCPDR_TS_SCAN_Y; |
43 | scpdr &= ~SCPDR_TS_SCAN_X; |
44 | __raw_writeb(val: scpdr, SCPDR); |
45 | udelay(30); |
46 | |
47 | absx = adc_single(ADC_CHANNEL_TS_X); |
48 | |
49 | scpdr = __raw_readb(SCPDR); |
50 | scpdr |= SCPDR_TS_SCAN_X; |
51 | scpdr &= ~SCPDR_TS_SCAN_ENABLE; |
52 | __raw_writeb(val: scpdr, SCPDR); |
53 | udelay(100); |
54 | touched = __raw_readb(PHDR) & PHDR_TS_PEN_DOWN; |
55 | } |
56 | |
57 | if (touched) { |
58 | input_report_key(dev: hp680_ts_dev, BTN_TOUCH, value: 1); |
59 | input_report_abs(dev: hp680_ts_dev, ABS_X, value: absx); |
60 | input_report_abs(dev: hp680_ts_dev, ABS_Y, value: absy); |
61 | } else { |
62 | input_report_key(dev: hp680_ts_dev, BTN_TOUCH, value: 0); |
63 | } |
64 | |
65 | input_sync(dev: hp680_ts_dev); |
66 | enable_irq(irq: HP680_TS_IRQ); |
67 | } |
68 | |
69 | static irqreturn_t hp680_ts_interrupt(int irq, void *dev) |
70 | { |
71 | disable_irq_nosync(irq); |
72 | schedule_delayed_work(dwork: &work, HZ / 20); |
73 | |
74 | return IRQ_HANDLED; |
75 | } |
76 | |
77 | static int __init hp680_ts_init(void) |
78 | { |
79 | int err; |
80 | |
81 | hp680_ts_dev = input_allocate_device(); |
82 | if (!hp680_ts_dev) |
83 | return -ENOMEM; |
84 | |
85 | hp680_ts_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); |
86 | hp680_ts_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
87 | |
88 | input_set_abs_params(dev: hp680_ts_dev, ABS_X, |
89 | HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, fuzz: 0, flat: 0); |
90 | input_set_abs_params(dev: hp680_ts_dev, ABS_Y, |
91 | HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, fuzz: 0, flat: 0); |
92 | |
93 | hp680_ts_dev->name = "HP Jornada touchscreen" ; |
94 | hp680_ts_dev->phys = "hp680_ts/input0" ; |
95 | |
96 | if (request_irq(irq: HP680_TS_IRQ, handler: hp680_ts_interrupt, |
97 | flags: 0, MODNAME, NULL) < 0) { |
98 | printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n" , |
99 | HP680_TS_IRQ); |
100 | err = -EBUSY; |
101 | goto fail1; |
102 | } |
103 | |
104 | err = input_register_device(hp680_ts_dev); |
105 | if (err) |
106 | goto fail2; |
107 | |
108 | return 0; |
109 | |
110 | fail2: free_irq(HP680_TS_IRQ, NULL); |
111 | cancel_delayed_work_sync(dwork: &work); |
112 | fail1: input_free_device(dev: hp680_ts_dev); |
113 | return err; |
114 | } |
115 | |
116 | static void __exit hp680_ts_exit(void) |
117 | { |
118 | free_irq(HP680_TS_IRQ, NULL); |
119 | cancel_delayed_work_sync(dwork: &work); |
120 | input_unregister_device(hp680_ts_dev); |
121 | } |
122 | |
123 | module_init(hp680_ts_init); |
124 | module_exit(hp680_ts_exit); |
125 | |
126 | MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua" ); |
127 | MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver" ); |
128 | MODULE_LICENSE("GPL" ); |
129 | |