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0387e107 DR |
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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
0387e107 DR |
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 | ||
25 | struct 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 | ||
43 | static 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 | ||
89 | static 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 | ||
108 | static 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 | ||
119 | static 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 | ||
129 | static 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 | ||
5298cc4c | 140 | static int pcap_ts_probe(struct platform_device *pdev) |
0387e107 DR |
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 | ||
194 | fail_register: | |
195 | input_unregister_device(input_dev); | |
196 | goto fail; | |
197 | fail_allocate: | |
198 | input_free_device(input_dev); | |
199 | fail: | |
200 | kfree(pcap_ts); | |
201 | ||
202 | return err; | |
203 | } | |
204 | ||
e2619cf7 | 205 | static int pcap_ts_remove(struct platform_device *pdev) |
0387e107 DR |
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 | |
220 | static 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 | ||
228 | static 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 | ||
47145210 | 237 | static const struct dev_pm_ops pcap_ts_pm_ops = { |
0387e107 DR |
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 | ||
246 | static struct platform_driver pcap_ts_driver = { | |
247 | .probe = pcap_ts_probe, | |
1cb0aa88 | 248 | .remove = pcap_ts_remove, |
0387e107 DR |
249 | .driver = { |
250 | .name = "pcap-ts", | |
251 | .owner = THIS_MODULE, | |
252 | .pm = PCAP_TS_PM_OPS, | |
253 | }, | |
254 | }; | |
cdcc96e2 | 255 | module_platform_driver(pcap_ts_driver); |
0387e107 DR |
256 | |
257 | MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver"); | |
258 | MODULE_AUTHOR("Daniel Ribeiro / Harald Welte"); | |
259 | MODULE_LICENSE("GPL"); | |
260 | MODULE_ALIAS("platform:pcap_ts"); |