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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5637f02a KE |
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 | * | |
5637f02a KE |
10 | * HP Jornada 710/720/729 Touchscreen Driver |
11 | */ | |
12 | ||
3521a0f0 | 13 | #include <linux/gpio/consumer.h> |
5637f02a | 14 | #include <linux/platform_device.h> |
5637f02a KE |
15 | #include <linux/input.h> |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/module.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
3169663a | 19 | #include <linux/io.h> |
5637f02a | 20 | |
a09e64fb | 21 | #include <mach/jornada720.h> |
5637f02a KE |
22 | |
23 | MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); | |
24 | MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); | |
839cd310 | 25 | MODULE_LICENSE("GPL v2"); |
5637f02a KE |
26 | |
27 | struct jornada_ts { | |
28 | struct input_dev *dev; | |
3521a0f0 | 29 | struct gpio_desc *gpio; |
5637f02a KE |
30 | int x_data[4]; /* X sample values */ |
31 | int y_data[4]; /* Y sample values */ | |
32 | }; | |
33 | ||
34 | static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) | |
35 | { | |
fe96244b PG |
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); | |
5637f02a | 40 | |
fe96244b PG |
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); | |
5637f02a | 45 | |
fe96244b PG |
46 | /* combined x samples bits */ |
47 | jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); | |
5637f02a | 48 | |
fe96244b PG |
49 | /* combined y samples bits */ |
50 | jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); | |
5637f02a KE |
51 | } |
52 | ||
53 | static 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 | ||
64 | static 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 | ||
3521a0f0 RK |
71 | /* If gpio is high then report pen up */ |
72 | if (gpiod_get_value(jornada_ts->gpio)) { | |
5637f02a KE |
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 | ||
5298cc4c | 97 | static int jornada720_ts_probe(struct platform_device *pdev) |
5637f02a KE |
98 | { |
99 | struct jornada_ts *jornada_ts; | |
100 | struct input_dev *input_dev; | |
3521a0f0 | 101 | int error, irq; |
5637f02a | 102 | |
4b080e3b PG |
103 | jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL); |
104 | if (!jornada_ts) | |
105 | return -ENOMEM; | |
5637f02a | 106 | |
4b080e3b PG |
107 | input_dev = devm_input_allocate_device(&pdev->dev); |
108 | if (!input_dev) | |
109 | return -ENOMEM; | |
5637f02a KE |
110 | |
111 | platform_set_drvdata(pdev, jornada_ts); | |
112 | ||
3521a0f0 RK |
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 | ||
5637f02a KE |
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 | ||
1577e4b7 KE |
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); | |
5637f02a KE |
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 | ||
3521a0f0 | 133 | error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt, |
4b080e3b PG |
134 | IRQF_TRIGGER_RISING, |
135 | "HP7XX Touchscreen driver", pdev); | |
5637f02a | 136 | if (error) { |
4b080e3b PG |
137 | dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n"); |
138 | return error; | |
5637f02a KE |
139 | } |
140 | ||
141 | error = input_register_device(jornada_ts->dev); | |
142 | if (error) | |
4b080e3b | 143 | return error; |
5637f02a KE |
144 | |
145 | return 0; | |
146 | } | |
147 | ||
d7b5247b KS |
148 | /* work with hotplug and coldplug */ |
149 | MODULE_ALIAS("platform:jornada_ts"); | |
150 | ||
5637f02a KE |
151 | static struct platform_driver jornada720_ts_driver = { |
152 | .probe = jornada720_ts_probe, | |
5637f02a KE |
153 | .driver = { |
154 | .name = "jornada_ts", | |
155 | }, | |
156 | }; | |
cdcc96e2 | 157 | module_platform_driver(jornada720_ts_driver); |