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d201fd5d SH |
1 | /* |
2 | * Driver for the Freescale Semiconductor MC13783 touchscreen. | |
3 | * | |
4 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. | |
5 | * Copyright (C) 2009 Sascha Hauer, Pengutronix | |
6 | * | |
7 | * Initial development of this code was funded by | |
8 | * Phytec Messtechnik GmbH, http://www.phytec.de/ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License version 2 as published by | |
12 | * the Free Software Foundation. | |
13 | */ | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/mfd/mc13783.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/sched.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
d201fd5d SH |
21 | #include <linux/init.h> |
22 | ||
23 | #define MC13783_TS_NAME "mc13783-ts" | |
24 | ||
25 | #define DEFAULT_SAMPLE_TOLERANCE 300 | |
26 | ||
27 | static unsigned int sample_tolerance = DEFAULT_SAMPLE_TOLERANCE; | |
28 | module_param(sample_tolerance, uint, S_IRUGO | S_IWUSR); | |
29 | MODULE_PARM_DESC(sample_tolerance, | |
30 | "If the minimal and maximal value read out for one axis (out " | |
31 | "of three) differ by this value (default: " | |
32 | __stringify(DEFAULT_SAMPLE_TOLERANCE) ") or more, the reading " | |
33 | "is supposed to be wrong and is discarded. Set to 0 to " | |
34 | "disable this check."); | |
35 | ||
36 | struct mc13783_ts_priv { | |
37 | struct input_dev *idev; | |
8dd93eee | 38 | struct mc13xxx *mc13xxx; |
d201fd5d | 39 | struct delayed_work work; |
d201fd5d | 40 | unsigned int sample[4]; |
1039d762 | 41 | struct mc13xxx_ts_platform_data *touch; |
d201fd5d SH |
42 | }; |
43 | ||
44 | static irqreturn_t mc13783_ts_handler(int irq, void *data) | |
45 | { | |
46 | struct mc13783_ts_priv *priv = data; | |
47 | ||
8dd93eee | 48 | mc13xxx_irq_ack(priv->mc13xxx, irq); |
d201fd5d SH |
49 | |
50 | /* | |
51 | * Kick off reading coordinates. Note that if work happens already | |
52 | * be queued for future execution (it rearms itself) it will not | |
53 | * be rescheduled for immediate execution here. However the rearm | |
54 | * delay is HZ / 50 which is acceptable. | |
55 | */ | |
62e51475 | 56 | schedule_delayed_work(&priv->work, 0); |
d201fd5d SH |
57 | |
58 | return IRQ_HANDLED; | |
59 | } | |
60 | ||
61 | #define sort3(a0, a1, a2) ({ \ | |
62 | if (a0 > a1) \ | |
63 | swap(a0, a1); \ | |
64 | if (a1 > a2) \ | |
65 | swap(a1, a2); \ | |
66 | if (a0 > a1) \ | |
67 | swap(a0, a1); \ | |
68 | }) | |
69 | ||
70 | static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv) | |
71 | { | |
72 | struct input_dev *idev = priv->idev; | |
73 | int x0, x1, x2, y0, y1, y2; | |
74 | int cr0, cr1; | |
75 | ||
76 | /* | |
77 | * the values are 10-bit wide only, but the two least significant | |
78 | * bits are for future 12 bit use and reading yields 0 | |
79 | */ | |
80 | x0 = priv->sample[0] & 0xfff; | |
81 | x1 = priv->sample[1] & 0xfff; | |
82 | x2 = priv->sample[2] & 0xfff; | |
83 | y0 = priv->sample[3] & 0xfff; | |
84 | y1 = (priv->sample[0] >> 12) & 0xfff; | |
85 | y2 = (priv->sample[1] >> 12) & 0xfff; | |
86 | cr0 = (priv->sample[2] >> 12) & 0xfff; | |
87 | cr1 = (priv->sample[3] >> 12) & 0xfff; | |
88 | ||
89 | dev_dbg(&idev->dev, | |
90 | "x: (% 4d,% 4d,% 4d) y: (% 4d, % 4d,% 4d) cr: (% 4d, % 4d)\n", | |
91 | x0, x1, x2, y0, y1, y2, cr0, cr1); | |
92 | ||
93 | sort3(x0, x1, x2); | |
94 | sort3(y0, y1, y2); | |
95 | ||
96 | cr0 = (cr0 + cr1) / 2; | |
97 | ||
98 | if (!cr0 || !sample_tolerance || | |
99 | (x2 - x0 < sample_tolerance && | |
100 | y2 - y0 < sample_tolerance)) { | |
101 | /* report the median coordinate and average pressure */ | |
102 | if (cr0) { | |
103 | input_report_abs(idev, ABS_X, x1); | |
104 | input_report_abs(idev, ABS_Y, y1); | |
105 | ||
106 | dev_dbg(&idev->dev, "report (%d, %d, %d)\n", | |
107 | x1, y1, 0x1000 - cr0); | |
62e51475 BS |
108 | schedule_delayed_work(&priv->work, HZ / 50); |
109 | } else { | |
d201fd5d | 110 | dev_dbg(&idev->dev, "report release\n"); |
62e51475 | 111 | } |
d201fd5d SH |
112 | |
113 | input_report_abs(idev, ABS_PRESSURE, | |
114 | cr0 ? 0x1000 - cr0 : cr0); | |
115 | input_report_key(idev, BTN_TOUCH, cr0); | |
116 | input_sync(idev); | |
62e51475 | 117 | } else { |
d201fd5d | 118 | dev_dbg(&idev->dev, "discard event\n"); |
62e51475 | 119 | } |
d201fd5d SH |
120 | } |
121 | ||
122 | static void mc13783_ts_work(struct work_struct *work) | |
123 | { | |
124 | struct mc13783_ts_priv *priv = | |
125 | container_of(work, struct mc13783_ts_priv, work.work); | |
8dd93eee | 126 | unsigned int mode = MC13XXX_ADC_MODE_TS; |
d201fd5d SH |
127 | unsigned int channel = 12; |
128 | ||
8dd93eee | 129 | if (mc13xxx_adc_do_conversion(priv->mc13xxx, |
1039d762 MT |
130 | mode, channel, |
131 | priv->touch->ato, priv->touch->atox, | |
132 | priv->sample) == 0) | |
d201fd5d SH |
133 | mc13783_ts_report_sample(priv); |
134 | } | |
135 | ||
136 | static int mc13783_ts_open(struct input_dev *dev) | |
137 | { | |
138 | struct mc13783_ts_priv *priv = input_get_drvdata(dev); | |
139 | int ret; | |
140 | ||
8dd93eee | 141 | mc13xxx_lock(priv->mc13xxx); |
d201fd5d | 142 | |
8dd93eee | 143 | mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TS); |
d201fd5d | 144 | |
8dd93eee | 145 | ret = mc13xxx_irq_request(priv->mc13xxx, MC13XXX_IRQ_TS, |
d201fd5d SH |
146 | mc13783_ts_handler, MC13783_TS_NAME, priv); |
147 | if (ret) | |
148 | goto out; | |
149 | ||
8dd93eee UKK |
150 | ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0, |
151 | MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0); | |
d201fd5d | 152 | if (ret) |
8dd93eee | 153 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv); |
d201fd5d | 154 | out: |
8dd93eee | 155 | mc13xxx_unlock(priv->mc13xxx); |
d201fd5d SH |
156 | return ret; |
157 | } | |
158 | ||
159 | static void mc13783_ts_close(struct input_dev *dev) | |
160 | { | |
161 | struct mc13783_ts_priv *priv = input_get_drvdata(dev); | |
162 | ||
8dd93eee UKK |
163 | mc13xxx_lock(priv->mc13xxx); |
164 | mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0, | |
165 | MC13XXX_ADC0_TSMOD_MASK, 0); | |
166 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv); | |
167 | mc13xxx_unlock(priv->mc13xxx); | |
d201fd5d SH |
168 | |
169 | cancel_delayed_work_sync(&priv->work); | |
170 | } | |
171 | ||
172 | static int __init mc13783_ts_probe(struct platform_device *pdev) | |
173 | { | |
174 | struct mc13783_ts_priv *priv; | |
175 | struct input_dev *idev; | |
176 | int ret = -ENOMEM; | |
177 | ||
178 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
179 | idev = input_allocate_device(); | |
180 | if (!priv || !idev) | |
181 | goto err_free_mem; | |
182 | ||
183 | INIT_DELAYED_WORK(&priv->work, mc13783_ts_work); | |
8dd93eee | 184 | priv->mc13xxx = dev_get_drvdata(pdev->dev.parent); |
d201fd5d | 185 | priv->idev = idev; |
1039d762 MT |
186 | priv->touch = dev_get_platdata(&pdev->dev); |
187 | if (!priv->touch) { | |
188 | dev_err(&pdev->dev, "missing platform data\n"); | |
189 | ret = -ENODEV; | |
190 | goto err_free_mem; | |
191 | } | |
d201fd5d | 192 | |
d201fd5d SH |
193 | idev->name = MC13783_TS_NAME; |
194 | idev->dev.parent = &pdev->dev; | |
195 | ||
196 | idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
197 | idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
198 | input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0); | |
199 | input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0); | |
200 | input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0); | |
201 | ||
202 | idev->open = mc13783_ts_open; | |
203 | idev->close = mc13783_ts_close; | |
204 | ||
205 | input_set_drvdata(idev, priv); | |
206 | ||
207 | ret = input_register_device(priv->idev); | |
208 | if (ret) { | |
209 | dev_err(&pdev->dev, | |
210 | "register input device failed with %d\n", ret); | |
62e51475 | 211 | goto err_free_mem; |
d201fd5d SH |
212 | } |
213 | ||
214 | platform_set_drvdata(pdev, priv); | |
215 | return 0; | |
216 | ||
d201fd5d SH |
217 | err_free_mem: |
218 | input_free_device(idev); | |
219 | kfree(priv); | |
220 | return ret; | |
221 | } | |
222 | ||
e2619cf7 | 223 | static int mc13783_ts_remove(struct platform_device *pdev) |
d201fd5d SH |
224 | { |
225 | struct mc13783_ts_priv *priv = platform_get_drvdata(pdev); | |
226 | ||
d201fd5d SH |
227 | input_unregister_device(priv->idev); |
228 | kfree(priv); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static struct platform_driver mc13783_ts_driver = { | |
1cb0aa88 | 234 | .remove = mc13783_ts_remove, |
d201fd5d | 235 | .driver = { |
d201fd5d SH |
236 | .name = MC13783_TS_NAME, |
237 | }, | |
238 | }; | |
d3d25808 | 239 | |
38a46eb8 | 240 | module_platform_driver_probe(mc13783_ts_driver, mc13783_ts_probe); |
d201fd5d SH |
241 | |
242 | MODULE_DESCRIPTION("MC13783 input touchscreen driver"); | |
243 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
244 | MODULE_LICENSE("GPL v2"); | |
245 | MODULE_ALIAS("platform:" MC13783_TS_NAME); |