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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d201fd5d SH |
2 | /* |
3 | * Driver for the Freescale Semiconductor MC13783 touchscreen. | |
4 | * | |
5 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. | |
6 | * Copyright (C) 2009 Sascha Hauer, Pengutronix | |
7 | * | |
8 | * Initial development of this code was funded by | |
9 | * Phytec Messtechnik GmbH, http://www.phytec.de/ | |
d201fd5d SH |
10 | */ |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/mfd/mc13783.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/input.h> | |
16 | #include <linux/sched.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
d201fd5d SH |
18 | #include <linux/init.h> |
19 | ||
20 | #define MC13783_TS_NAME "mc13783-ts" | |
21 | ||
22 | #define DEFAULT_SAMPLE_TOLERANCE 300 | |
23 | ||
24 | static unsigned int sample_tolerance = DEFAULT_SAMPLE_TOLERANCE; | |
25 | module_param(sample_tolerance, uint, S_IRUGO | S_IWUSR); | |
26 | MODULE_PARM_DESC(sample_tolerance, | |
27 | "If the minimal and maximal value read out for one axis (out " | |
28 | "of three) differ by this value (default: " | |
29 | __stringify(DEFAULT_SAMPLE_TOLERANCE) ") or more, the reading " | |
30 | "is supposed to be wrong and is discarded. Set to 0 to " | |
31 | "disable this check."); | |
32 | ||
33 | struct mc13783_ts_priv { | |
34 | struct input_dev *idev; | |
8dd93eee | 35 | struct mc13xxx *mc13xxx; |
d201fd5d | 36 | struct delayed_work work; |
d201fd5d | 37 | unsigned int sample[4]; |
1039d762 | 38 | struct mc13xxx_ts_platform_data *touch; |
d201fd5d SH |
39 | }; |
40 | ||
41 | static irqreturn_t mc13783_ts_handler(int irq, void *data) | |
42 | { | |
43 | struct mc13783_ts_priv *priv = data; | |
44 | ||
8dd93eee | 45 | mc13xxx_irq_ack(priv->mc13xxx, irq); |
d201fd5d SH |
46 | |
47 | /* | |
48 | * Kick off reading coordinates. Note that if work happens already | |
49 | * be queued for future execution (it rearms itself) it will not | |
50 | * be rescheduled for immediate execution here. However the rearm | |
51 | * delay is HZ / 50 which is acceptable. | |
52 | */ | |
62e51475 | 53 | schedule_delayed_work(&priv->work, 0); |
d201fd5d SH |
54 | |
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | #define sort3(a0, a1, a2) ({ \ | |
59 | if (a0 > a1) \ | |
60 | swap(a0, a1); \ | |
61 | if (a1 > a2) \ | |
62 | swap(a1, a2); \ | |
63 | if (a0 > a1) \ | |
64 | swap(a0, a1); \ | |
65 | }) | |
66 | ||
67 | static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv) | |
68 | { | |
69 | struct input_dev *idev = priv->idev; | |
70 | int x0, x1, x2, y0, y1, y2; | |
71 | int cr0, cr1; | |
72 | ||
73 | /* | |
74 | * the values are 10-bit wide only, but the two least significant | |
75 | * bits are for future 12 bit use and reading yields 0 | |
76 | */ | |
77 | x0 = priv->sample[0] & 0xfff; | |
78 | x1 = priv->sample[1] & 0xfff; | |
79 | x2 = priv->sample[2] & 0xfff; | |
80 | y0 = priv->sample[3] & 0xfff; | |
81 | y1 = (priv->sample[0] >> 12) & 0xfff; | |
82 | y2 = (priv->sample[1] >> 12) & 0xfff; | |
83 | cr0 = (priv->sample[2] >> 12) & 0xfff; | |
84 | cr1 = (priv->sample[3] >> 12) & 0xfff; | |
85 | ||
86 | dev_dbg(&idev->dev, | |
87 | "x: (% 4d,% 4d,% 4d) y: (% 4d, % 4d,% 4d) cr: (% 4d, % 4d)\n", | |
88 | x0, x1, x2, y0, y1, y2, cr0, cr1); | |
89 | ||
90 | sort3(x0, x1, x2); | |
91 | sort3(y0, y1, y2); | |
92 | ||
93 | cr0 = (cr0 + cr1) / 2; | |
94 | ||
95 | if (!cr0 || !sample_tolerance || | |
96 | (x2 - x0 < sample_tolerance && | |
97 | y2 - y0 < sample_tolerance)) { | |
98 | /* report the median coordinate and average pressure */ | |
99 | if (cr0) { | |
100 | input_report_abs(idev, ABS_X, x1); | |
101 | input_report_abs(idev, ABS_Y, y1); | |
102 | ||
103 | dev_dbg(&idev->dev, "report (%d, %d, %d)\n", | |
104 | x1, y1, 0x1000 - cr0); | |
62e51475 BS |
105 | schedule_delayed_work(&priv->work, HZ / 50); |
106 | } else { | |
d201fd5d | 107 | dev_dbg(&idev->dev, "report release\n"); |
62e51475 | 108 | } |
d201fd5d SH |
109 | |
110 | input_report_abs(idev, ABS_PRESSURE, | |
111 | cr0 ? 0x1000 - cr0 : cr0); | |
112 | input_report_key(idev, BTN_TOUCH, cr0); | |
113 | input_sync(idev); | |
62e51475 | 114 | } else { |
d201fd5d | 115 | dev_dbg(&idev->dev, "discard event\n"); |
62e51475 | 116 | } |
d201fd5d SH |
117 | } |
118 | ||
119 | static void mc13783_ts_work(struct work_struct *work) | |
120 | { | |
121 | struct mc13783_ts_priv *priv = | |
122 | container_of(work, struct mc13783_ts_priv, work.work); | |
8dd93eee | 123 | unsigned int mode = MC13XXX_ADC_MODE_TS; |
d201fd5d SH |
124 | unsigned int channel = 12; |
125 | ||
8dd93eee | 126 | if (mc13xxx_adc_do_conversion(priv->mc13xxx, |
1039d762 MT |
127 | mode, channel, |
128 | priv->touch->ato, priv->touch->atox, | |
129 | priv->sample) == 0) | |
d201fd5d SH |
130 | mc13783_ts_report_sample(priv); |
131 | } | |
132 | ||
133 | static int mc13783_ts_open(struct input_dev *dev) | |
134 | { | |
135 | struct mc13783_ts_priv *priv = input_get_drvdata(dev); | |
136 | int ret; | |
137 | ||
8dd93eee | 138 | mc13xxx_lock(priv->mc13xxx); |
d201fd5d | 139 | |
8dd93eee | 140 | mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TS); |
d201fd5d | 141 | |
8dd93eee | 142 | ret = mc13xxx_irq_request(priv->mc13xxx, MC13XXX_IRQ_TS, |
d201fd5d SH |
143 | mc13783_ts_handler, MC13783_TS_NAME, priv); |
144 | if (ret) | |
145 | goto out; | |
146 | ||
8dd93eee UKK |
147 | ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0, |
148 | MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0); | |
d201fd5d | 149 | if (ret) |
8dd93eee | 150 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv); |
d201fd5d | 151 | out: |
8dd93eee | 152 | mc13xxx_unlock(priv->mc13xxx); |
d201fd5d SH |
153 | return ret; |
154 | } | |
155 | ||
156 | static void mc13783_ts_close(struct input_dev *dev) | |
157 | { | |
158 | struct mc13783_ts_priv *priv = input_get_drvdata(dev); | |
159 | ||
8dd93eee UKK |
160 | mc13xxx_lock(priv->mc13xxx); |
161 | mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0, | |
162 | MC13XXX_ADC0_TSMOD_MASK, 0); | |
163 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv); | |
164 | mc13xxx_unlock(priv->mc13xxx); | |
d201fd5d SH |
165 | |
166 | cancel_delayed_work_sync(&priv->work); | |
167 | } | |
168 | ||
169 | static int __init mc13783_ts_probe(struct platform_device *pdev) | |
170 | { | |
171 | struct mc13783_ts_priv *priv; | |
172 | struct input_dev *idev; | |
173 | int ret = -ENOMEM; | |
174 | ||
175 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
176 | idev = input_allocate_device(); | |
177 | if (!priv || !idev) | |
178 | goto err_free_mem; | |
179 | ||
180 | INIT_DELAYED_WORK(&priv->work, mc13783_ts_work); | |
8dd93eee | 181 | priv->mc13xxx = dev_get_drvdata(pdev->dev.parent); |
d201fd5d | 182 | priv->idev = idev; |
1039d762 MT |
183 | priv->touch = dev_get_platdata(&pdev->dev); |
184 | if (!priv->touch) { | |
185 | dev_err(&pdev->dev, "missing platform data\n"); | |
186 | ret = -ENODEV; | |
187 | goto err_free_mem; | |
188 | } | |
d201fd5d | 189 | |
d201fd5d SH |
190 | idev->name = MC13783_TS_NAME; |
191 | idev->dev.parent = &pdev->dev; | |
192 | ||
193 | idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
194 | idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
195 | input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0); | |
196 | input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0); | |
197 | input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0); | |
198 | ||
199 | idev->open = mc13783_ts_open; | |
200 | idev->close = mc13783_ts_close; | |
201 | ||
202 | input_set_drvdata(idev, priv); | |
203 | ||
204 | ret = input_register_device(priv->idev); | |
205 | if (ret) { | |
206 | dev_err(&pdev->dev, | |
207 | "register input device failed with %d\n", ret); | |
62e51475 | 208 | goto err_free_mem; |
d201fd5d SH |
209 | } |
210 | ||
211 | platform_set_drvdata(pdev, priv); | |
212 | return 0; | |
213 | ||
d201fd5d SH |
214 | err_free_mem: |
215 | input_free_device(idev); | |
216 | kfree(priv); | |
217 | return ret; | |
218 | } | |
219 | ||
e2619cf7 | 220 | static int mc13783_ts_remove(struct platform_device *pdev) |
d201fd5d SH |
221 | { |
222 | struct mc13783_ts_priv *priv = platform_get_drvdata(pdev); | |
223 | ||
d201fd5d SH |
224 | input_unregister_device(priv->idev); |
225 | kfree(priv); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static struct platform_driver mc13783_ts_driver = { | |
1cb0aa88 | 231 | .remove = mc13783_ts_remove, |
d201fd5d | 232 | .driver = { |
d201fd5d SH |
233 | .name = MC13783_TS_NAME, |
234 | }, | |
235 | }; | |
d3d25808 | 236 | |
38a46eb8 | 237 | module_platform_driver_probe(mc13783_ts_driver, mc13783_ts_probe); |
d201fd5d SH |
238 | |
239 | MODULE_DESCRIPTION("MC13783 input touchscreen driver"); | |
240 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
241 | MODULE_LICENSE("GPL v2"); | |
242 | MODULE_ALIAS("platform:" MC13783_TS_NAME); |