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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/gpio.h> |
26 | #include <linux/irq.h> |
27 | #include <linux/interrupt.h> |
28 | #include <linux/io.h> |
29 | #include <linux/wm97xx.h> |
30 | |
31 | #include <mach/hardware.h> |
32 | #include <mach/mfp.h> |
33 | #include <mach/regs-ac97.h> |
34 | |
35 | struct continuous { |
36 | u16 id; /* codec id */ |
37 | u8 code; /* continuous code */ |
38 | u8 reads; /* number of coord reads per read cycle */ |
39 | u32 speed; /* number of coords per second */ |
40 | }; |
41 | |
42 | #define WM_READS(sp) ((sp / HZ) + 1) |
43 | |
44 | static const struct continuous cinfo[] = { |
45 | { WM9713_ID2, 0, WM_READS(94), 94 }, |
46 | { WM9713_ID2, 1, WM_READS(120), 120 }, |
47 | { WM9713_ID2, 2, WM_READS(154), 154 }, |
48 | { WM9713_ID2, 3, WM_READS(188), 188 }, |
49 | }; |
50 | |
51 | /* continuous speed index */ |
52 | static int sp_idx; |
53 | |
54 | /* |
55 | * Pen sampling frequency (Hz) in continuous mode. |
56 | */ |
57 | static int cont_rate = 200; |
58 | module_param(cont_rate, int, 0); |
59 | MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); |
60 | |
61 | /* |
62 | * Pressure readback. |
63 | * |
64 | * Set to 1 to read back pen down pressure |
65 | */ |
66 | static int pressure; |
67 | module_param(pressure, int, 0); |
68 | MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); |
69 | |
70 | /* |
71 | * AC97 touch data slot. |
72 | * |
73 | * Touch screen readback data ac97 slot |
74 | */ |
75 | static int ac97_touch_slot = 5; |
76 | module_param(ac97_touch_slot, int, 0); |
77 | MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); |
78 | |
79 | |
80 | /* flush AC97 slot 5 FIFO machines */ |
81 | static void wm97xx_acc_pen_up(struct wm97xx *wm) |
82 | { |
83 | int i; |
84 | |
85 | msleep(1); |
86 | |
87 | for (i = 0; i < 16; i++) |
88 | MODR; |
89 | } |
90 | |
91 | static int wm97xx_acc_pen_down(struct wm97xx *wm) |
92 | { |
93 | u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES; |
94 | int reads = 0; |
95 | static u16 last, tries; |
96 | |
97 | /* When the AC97 queue has been drained we need to allow time |
98 | * to buffer up samples otherwise we end up spinning polling |
99 | * for samples. The controller can't have a suitably low |
100 | * threshold set to use the notifications it gives. |
101 | */ |
102 | msleep(1); |
103 | |
104 | if (tries > 5) { |
105 | tries = 0; |
106 | return RC_PENUP; |
107 | } |
108 | |
109 | x = MODR; |
110 | if (x == last) { |
111 | tries++; |
112 | return RC_AGAIN; |
113 | } |
114 | last = x; |
115 | do { |
116 | if (reads) |
117 | x = MODR; |
118 | y = MODR; |
119 | if (pressure) |
120 | p = MODR; |
121 | |
122 | dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n", |
123 | x, y, p); |
124 | |
125 | /* are samples valid */ |
126 | if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X || |
127 | (y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y || |
128 | (p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES) |
129 | goto up; |
130 | |
131 | /* coordinate is good */ |
132 | tries = 0; |
133 | input_report_abs(wm->input_dev, ABS_X, x & 0xfff); |
134 | input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); |
135 | input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); |
136 | input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); |
137 | input_sync(wm->input_dev); |
138 | reads++; |
139 | } while (reads < cinfo[sp_idx].reads); |
140 | up: |
141 | return RC_PENDOWN | RC_AGAIN; |
142 | } |
143 | |
144 | static int wm97xx_acc_startup(struct wm97xx *wm) |
145 | { |
146 | int idx; |
147 | |
148 | /* check we have a codec */ |
149 | if (wm->ac97 == NULL) |
150 | return -ENODEV; |
151 | |
152 | /* Go you big red fire engine */ |
153 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { |
154 | if (wm->id != cinfo[idx].id) |
155 | continue; |
156 | sp_idx = idx; |
157 | if (cont_rate <= cinfo[idx].speed) |
158 | break; |
159 | } |
160 | wm->acc_rate = cinfo[sp_idx].code; |
161 | wm->acc_slot = ac97_touch_slot; |
162 | dev_info(wm->dev, |
163 | "zylonite accelerated touchscreen driver, %d samples/sec\n", |
164 | cinfo[sp_idx].speed); |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) |
170 | { |
171 | if (enable) |
172 | enable_irq(wm->pen_irq); |
173 | else |
174 | disable_irq_nosync(wm->pen_irq); |
175 | } |
176 | |
177 | static struct wm97xx_mach_ops zylonite_mach_ops = { |
178 | .acc_enabled = 1, |
179 | .acc_pen_up = wm97xx_acc_pen_up, |
180 | .acc_pen_down = wm97xx_acc_pen_down, |
181 | .acc_startup = wm97xx_acc_startup, |
182 | .irq_enable = wm97xx_irq_enable, |
183 | .irq_gpio = WM97XX_GPIO_2, |
184 | }; |
185 | |
186 | static int zylonite_wm97xx_probe(struct platform_device *pdev) |
187 | { |
188 | struct wm97xx *wm = platform_get_drvdata(pdev); |
189 | int gpio_touch_irq; |
190 | |
191 | if (cpu_is_pxa320()) |
192 | gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15); |
193 | else |
194 | gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26); |
195 | |
196 | wm->pen_irq = gpio_to_irq(gpio_touch_irq); |
197 | irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH); |
198 | |
199 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, |
200 | WM97XX_GPIO_POL_HIGH, |
201 | WM97XX_GPIO_STICKY, |
202 | WM97XX_GPIO_WAKE); |
203 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, |
204 | WM97XX_GPIO_POL_HIGH, |
205 | WM97XX_GPIO_NOTSTICKY, |
206 | WM97XX_GPIO_NOWAKE); |
207 | |
208 | return wm97xx_register_mach_ops(wm, &zylonite_mach_ops); |
209 | } |
210 | |
211 | static int zylonite_wm97xx_remove(struct platform_device *pdev) |
212 | { |
213 | struct wm97xx *wm = platform_get_drvdata(pdev); |
214 | |
215 | wm97xx_unregister_mach_ops(wm); |
216 | |
217 | return 0; |
218 | } |
219 | |
220 | static struct platform_driver zylonite_wm97xx_driver = { |
221 | .probe = zylonite_wm97xx_probe, |
222 | .remove = zylonite_wm97xx_remove, |
223 | .driver = { |
224 | .name = "wm97xx-touch", |
225 | }, |
226 | }; |
227 | module_platform_driver(zylonite_wm97xx_driver); |
228 | |
229 | /* Module information */ |
230 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
231 | MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite"); |
232 | MODULE_LICENSE("GPL"); |
233 |
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