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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0387e107 DR |
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> | |
0387e107 DR |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
0387e107 DR |
10 | #include <linux/fs.h> |
11 | #include <linux/string.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
0387e107 DR |
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 | ||
20 | struct 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 | ||
38 | static 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 | ||
84 | static void pcap_ts_work(struct work_struct *work) | |
85 | { | |
fa68e277 | 86 | struct delayed_work *dw = to_delayed_work(work); |
0387e107 DR |
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 | ||
103 | static 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 | ||
114 | static 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 | ||
124 | static 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 | ||
5298cc4c | 135 | static int pcap_ts_probe(struct platform_device *pdev) |
0387e107 DR |
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 | ||
189 | fail_register: | |
190 | input_unregister_device(input_dev); | |
191 | goto fail; | |
192 | fail_allocate: | |
193 | input_free_device(input_dev); | |
194 | fail: | |
195 | kfree(pcap_ts); | |
196 | ||
197 | return err; | |
198 | } | |
199 | ||
e2619cf7 | 200 | static int pcap_ts_remove(struct platform_device *pdev) |
0387e107 DR |
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 | return 0; | |
212 | } | |
213 | ||
214 | #ifdef CONFIG_PM | |
215 | static int pcap_ts_suspend(struct device *dev) | |
216 | { | |
217 | struct pcap_ts *pcap_ts = dev_get_drvdata(dev); | |
218 | ||
219 | pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static int pcap_ts_resume(struct device *dev) | |
224 | { | |
225 | struct pcap_ts *pcap_ts = dev_get_drvdata(dev); | |
226 | ||
227 | pcap_set_ts_bits(pcap_ts->pcap, | |
228 | pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); | |
229 | return 0; | |
230 | } | |
231 | ||
47145210 | 232 | static const struct dev_pm_ops pcap_ts_pm_ops = { |
0387e107 DR |
233 | .suspend = pcap_ts_suspend, |
234 | .resume = pcap_ts_resume, | |
235 | }; | |
236 | #define PCAP_TS_PM_OPS (&pcap_ts_pm_ops) | |
237 | #else | |
238 | #define PCAP_TS_PM_OPS NULL | |
239 | #endif | |
240 | ||
241 | static struct platform_driver pcap_ts_driver = { | |
242 | .probe = pcap_ts_probe, | |
1cb0aa88 | 243 | .remove = pcap_ts_remove, |
0387e107 DR |
244 | .driver = { |
245 | .name = "pcap-ts", | |
0387e107 DR |
246 | .pm = PCAP_TS_PM_OPS, |
247 | }, | |
248 | }; | |
cdcc96e2 | 249 | module_platform_driver(pcap_ts_driver); |
0387e107 DR |
250 | |
251 | MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver"); | |
252 | MODULE_AUTHOR("Daniel Ribeiro / Harald Welte"); | |
253 | MODULE_LICENSE("GPL"); | |
254 | MODULE_ALIAS("platform:pcap_ts"); |