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1 | /* |
2 | * zylonite-wm97xx.c -- Zylonite Continuous Touch screen driver | |
3 | * | |
4 | * Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC. | |
5 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
6 | * Parts Copyright : Ian Molton <spyro@f2s.com> | |
7 | * Andrew Zabolotny <zap@homelink.ru> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | * Notes: | |
15 | * This is a wm97xx extended touch driver supporting interrupt driven | |
16 | * and continuous operation on Marvell Zylonite development systems | |
17 | * (which have a WM9713 on board). | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/moduleparam.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/wm97xx.h> | |
29 | ||
30 | #include <mach/hardware.h> | |
31 | #include <mach/mfp.h> | |
32 | #include <mach/regs-ac97.h> | |
33 | ||
34 | struct continuous { | |
35 | u16 id; /* codec id */ | |
36 | u8 code; /* continuous code */ | |
37 | u8 reads; /* number of coord reads per read cycle */ | |
38 | u32 speed; /* number of coords per second */ | |
39 | }; | |
40 | ||
41 | #define WM_READS(sp) ((sp / HZ) + 1) | |
42 | ||
43 | static const struct continuous cinfo[] = { | |
44 | { WM9713_ID2, 0, WM_READS(94), 94 }, | |
45 | { WM9713_ID2, 1, WM_READS(120), 120 }, | |
46 | { WM9713_ID2, 2, WM_READS(154), 154 }, | |
47 | { WM9713_ID2, 3, WM_READS(188), 188 }, | |
48 | }; | |
49 | ||
50 | /* continuous speed index */ | |
51 | static int sp_idx; | |
52 | ||
53 | /* | |
54 | * Pen sampling frequency (Hz) in continuous mode. | |
55 | */ | |
56 | static int cont_rate = 200; | |
57 | module_param(cont_rate, int, 0); | |
58 | MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); | |
59 | ||
60 | /* | |
61 | * Pressure readback. | |
62 | * | |
63 | * Set to 1 to read back pen down pressure | |
64 | */ | |
65 | static int pressure; | |
66 | module_param(pressure, int, 0); | |
67 | MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); | |
68 | ||
69 | /* | |
70 | * AC97 touch data slot. | |
71 | * | |
72 | * Touch screen readback data ac97 slot | |
73 | */ | |
74 | static int ac97_touch_slot = 5; | |
75 | module_param(ac97_touch_slot, int, 0); | |
76 | MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); | |
77 | ||
78 | ||
79 | /* flush AC97 slot 5 FIFO machines */ | |
80 | static void wm97xx_acc_pen_up(struct wm97xx *wm) | |
81 | { | |
82 | int i; | |
83 | ||
84 | msleep(1); | |
85 | ||
86 | for (i = 0; i < 16; i++) | |
87 | MODR; | |
88 | } | |
89 | ||
90 | static int wm97xx_acc_pen_down(struct wm97xx *wm) | |
91 | { | |
92 | u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES; | |
93 | int reads = 0; | |
94 | static u16 last, tries; | |
95 | ||
96 | /* When the AC97 queue has been drained we need to allow time | |
97 | * to buffer up samples otherwise we end up spinning polling | |
98 | * for samples. The controller can't have a suitably low | |
99 | * threashold set to use the notifications it gives. | |
100 | */ | |
101 | msleep(1); | |
102 | ||
103 | if (tries > 5) { | |
104 | tries = 0; | |
105 | return RC_PENUP; | |
106 | } | |
107 | ||
108 | x = MODR; | |
109 | if (x == last) { | |
110 | tries++; | |
111 | return RC_AGAIN; | |
112 | } | |
113 | last = x; | |
114 | do { | |
115 | if (reads) | |
116 | x = MODR; | |
117 | y = MODR; | |
118 | if (pressure) | |
119 | p = MODR; | |
120 | ||
121 | /* are samples valid */ | |
122 | if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X || | |
123 | (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y || | |
124 | (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES) | |
125 | goto up; | |
126 | ||
127 | /* coordinate is good */ | |
128 | tries = 0; | |
129 | input_report_abs(wm->input_dev, ABS_X, x & 0xfff); | |
130 | input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); | |
131 | input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); | |
132 | input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); | |
133 | input_sync(wm->input_dev); | |
134 | reads++; | |
135 | } while (reads < cinfo[sp_idx].reads); | |
136 | up: | |
137 | return RC_PENDOWN | RC_AGAIN; | |
138 | } | |
139 | ||
140 | static int wm97xx_acc_startup(struct wm97xx *wm) | |
141 | { | |
142 | int idx; | |
143 | ||
144 | /* check we have a codec */ | |
145 | if (wm->ac97 == NULL) | |
146 | return -ENODEV; | |
147 | ||
148 | /* Go you big red fire engine */ | |
149 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { | |
150 | if (wm->id != cinfo[idx].id) | |
151 | continue; | |
152 | sp_idx = idx; | |
153 | if (cont_rate <= cinfo[idx].speed) | |
154 | break; | |
155 | } | |
156 | wm->acc_rate = cinfo[sp_idx].code; | |
157 | wm->acc_slot = ac97_touch_slot; | |
158 | dev_info(wm->dev, | |
159 | "zylonite accelerated touchscreen driver, %d samples/sec\n", | |
160 | cinfo[sp_idx].speed); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) | |
166 | { | |
167 | if (enable) | |
168 | enable_irq(wm->pen_irq); | |
169 | else | |
170 | disable_irq_nosync(wm->pen_irq); | |
171 | } | |
172 | ||
173 | static struct wm97xx_mach_ops zylonite_mach_ops = { | |
174 | .acc_enabled = 1, | |
175 | .acc_pen_up = wm97xx_acc_pen_up, | |
176 | .acc_pen_down = wm97xx_acc_pen_down, | |
177 | .acc_startup = wm97xx_acc_startup, | |
178 | .irq_enable = wm97xx_irq_enable, | |
179 | .irq_gpio = WM97XX_GPIO_2, | |
180 | }; | |
181 | ||
182 | static int zylonite_wm97xx_probe(struct platform_device *pdev) | |
183 | { | |
184 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
185 | int gpio_touch_irq; | |
186 | ||
187 | if (cpu_is_pxa320()) | |
188 | gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15); | |
189 | else | |
190 | gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26); | |
191 | ||
192 | wm->pen_irq = IRQ_GPIO(gpio_touch_irq); | |
193 | set_irq_type(IRQ_GPIO(gpio_touch_irq), IRQ_TYPE_EDGE_BOTH); | |
194 | ||
195 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, | |
196 | WM97XX_GPIO_POL_HIGH, | |
197 | WM97XX_GPIO_STICKY, | |
198 | WM97XX_GPIO_WAKE); | |
199 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, | |
200 | WM97XX_GPIO_POL_HIGH, | |
201 | WM97XX_GPIO_NOTSTICKY, | |
202 | WM97XX_GPIO_NOWAKE); | |
203 | ||
204 | return wm97xx_register_mach_ops(wm, &zylonite_mach_ops); | |
205 | } | |
206 | ||
207 | static int zylonite_wm97xx_remove(struct platform_device *pdev) | |
208 | { | |
209 | struct wm97xx *wm = platform_get_drvdata(pdev); | |
210 | ||
211 | wm97xx_unregister_mach_ops(wm); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static struct platform_driver zylonite_wm97xx_driver = { | |
217 | .probe = zylonite_wm97xx_probe, | |
218 | .remove = zylonite_wm97xx_remove, | |
219 | .driver = { | |
220 | .name = "wm97xx-touch", | |
221 | }, | |
222 | }; | |
223 | ||
224 | static int __init zylonite_wm97xx_init(void) | |
225 | { | |
226 | return platform_driver_register(&zylonite_wm97xx_driver); | |
227 | } | |
228 | ||
229 | static void __exit zylonite_wm97xx_exit(void) | |
230 | { | |
231 | platform_driver_unregister(&zylonite_wm97xx_driver); | |
232 | } | |
233 | ||
234 | module_init(zylonite_wm97xx_init); | |
235 | module_exit(zylonite_wm97xx_exit); | |
236 | ||
237 | /* Module information */ | |
238 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
239 | MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite"); | |
240 | MODULE_LICENSE("GPL"); |