1 /*
2  * drivers/input/keyboard/jornada680_kbd.c
3  *
4  * HP Jornada 620/660/680/690 scan keyboard platform driver
5  *  Copyright (C) 2007  Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
6  *
7  * Based on hp680_keyb.c
8  *  Copyright (C) 2006 Paul Mundt
9  *  Copyright (C) 2005 Andriy Skulysh
10  * Split from drivers/input/keyboard/hp600_keyb.c
11  *  Copyright (C) 2000 Yaegashi Takeshi (hp6xx kbd scan routine and translation table)
12  *  Copyright (C) 2000 Niibe Yutaka (HP620 Keyb translation table)
13  *
14  * This program is free software; you can redistribute it and/or modify it
15  * under the terms of the GNU General Public License version 2 as
16  * published by the Free Software Foundation.
17  */
18 
19 #include <linux/device.h>
20 #include <linux/input.h>
21 #include <linux/input-polldev.h>
22 #include <linux/interrupt.h>
23 #include <linux/jiffies.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/slab.h>
28 
29 #include <asm/delay.h>
30 #include <asm/io.h>
31 
32 #define PCCR 0xa4000104
33 #define PDCR 0xa4000106
34 #define PECR 0xa4000108
35 #define PFCR 0xa400010a
36 #define PCDR 0xa4000124
37 #define PDDR 0xa4000126
38 #define PEDR 0xa4000128
39 #define PFDR 0xa400012a
40 #define PGDR 0xa400012c
41 #define PHDR 0xa400012e
42 #define PJDR 0xa4000130
43 #define PKDR 0xa4000132
44 #define PLDR 0xa4000134
45 
46 static const unsigned short jornada_scancodes[] = {
47 /* PTD1 */	KEY_CAPSLOCK, KEY_MACRO, KEY_LEFTCTRL, 0, KEY_ESC, KEY_KP5, 0, 0,			/*  1  -> 8   */
48 		KEY_F1, KEY_F2, KEY_F3, KEY_F8, KEY_F7, KEY_F6, KEY_F4, KEY_F5,				/*  9  -> 16  */
49 /* PTD5 */	KEY_SLASH, KEY_APOSTROPHE, KEY_ENTER, 0, KEY_Z, 0, 0, 0,				/*  17 -> 24  */
50 		KEY_X, KEY_C, KEY_V, KEY_DOT, KEY_COMMA, KEY_M, KEY_B, KEY_N,				/*  25 -> 32  */
51 /* PTD7 */	KEY_KP2, KEY_KP6, KEY_KP3, 0, 0, 0, 0, 0,						/*  33 -> 40  */
52 		KEY_F10, KEY_RO, KEY_F9, KEY_KP4, KEY_NUMLOCK, KEY_SCROLLLOCK, KEY_LEFTALT, KEY_HANJA,	/*  41 -> 48  */
53 /* PTE0 */	KEY_KATAKANA, KEY_KP0, KEY_GRAVE, 0, KEY_FINANCE, 0, 0, 0,				/*  49 -> 56  */
54 		KEY_KPMINUS, KEY_HIRAGANA, KEY_SPACE, KEY_KPDOT, KEY_VOLUMEUP, 249, 0, 0,		/*  57 -> 64  */
55 /* PTE1 */	KEY_SEMICOLON, KEY_RIGHTBRACE, KEY_BACKSLASH, 0, KEY_A, 0, 0, 0,			/*  65 -> 72  */
56 		KEY_S, KEY_D, KEY_F, KEY_L, KEY_K, KEY_J, KEY_G, KEY_H,					/*  73 -> 80  */
57 /* PTE3 */	KEY_KP8, KEY_LEFTMETA, KEY_RIGHTSHIFT, 0, KEY_TAB, 0, 0, 0,				/*  81 -> 88  */
58 		0, KEY_LEFTSHIFT, KEY_KP7, KEY_KP9, KEY_KP1, KEY_F11, KEY_KPPLUS, KEY_KPASTERISK,	/*  89 -> 96  */
59 /* PTE6 */	KEY_P, KEY_LEFTBRACE, KEY_BACKSPACE, 0, KEY_Q, 0, 0, 0,					/*  97 -> 104 */
60 		KEY_W, KEY_E, KEY_R, KEY_O, KEY_I, KEY_U, KEY_T, KEY_Y,					/* 105 -> 112 */
61 /* PTE7 */	KEY_0, KEY_MINUS, KEY_EQUAL, 0, KEY_1, 0, 0, 0,						/* 113 -> 120 */
62 		KEY_2, KEY_3, KEY_4, KEY_9, KEY_8, KEY_7, KEY_5, KEY_6,					/* 121 -> 128 */
63 /* **** */	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
64 		0, 0, 0, 0, 0
65 };
66 
67 #define JORNADA_SCAN_SIZE	18
68 
69 struct jornadakbd {
70 	struct input_polled_dev *poll_dev;
71 	unsigned short keymap[ARRAY_SIZE(jornada_scancodes)];
72 	unsigned char length;
73 	unsigned char old_scan[JORNADA_SCAN_SIZE];
74 	unsigned char new_scan[JORNADA_SCAN_SIZE];
75 };
76 
77 static void jornada_parse_kbd(struct jornadakbd *jornadakbd)
78 {
79 	struct input_dev *input_dev = jornadakbd->poll_dev->input;
80 	unsigned short *keymap = jornadakbd->keymap;
81 	unsigned int sync_me = 0;
82 	unsigned int i, j;
83 
84 	for (i = 0; i < JORNADA_SCAN_SIZE; i++) {
85 		unsigned char new = jornadakbd->new_scan[i];
86 		unsigned char old = jornadakbd->old_scan[i];
87 		unsigned int xor = new ^ old;
88 
89 		if (xor == 0)
90 			continue;
91 
92 		for (j = 0; j < 8; j++) {
93 			unsigned int bit = 1 << j;
94 			if (xor & bit) {
95 				unsigned int scancode = (i << 3) + j;
96 				input_event(input_dev,
97 					    EV_MSC, MSC_SCAN, scancode);
98 				input_report_key(input_dev,
99 						 keymap[scancode],
100 						 !(new & bit));
101 				sync_me = 1;
102 			}
103 		}
104 	}
105 
106 	if (sync_me)
107 	    input_sync(input_dev);
108 }
109 
110 static void jornada_scan_keyb(unsigned char *s)
111 {
112 	int i;
113 	unsigned short ec_static, dc_static; /* = UINT16_t */
114 	unsigned char matrix_switch[] = {
115 		0xfd, 0xff,   /* PTD1 PD(1) */
116 		0xdf, 0xff,   /* PTD5 PD(5) */
117 		0x7f, 0xff,   /* PTD7 PD(7) */
118 		0xff, 0xfe,   /* PTE0 PE(0) */
119 		0xff, 0xfd,   /* PTE1 PE(1) */
120 		0xff, 0xf7,   /* PTE3 PE(3) */
121 		0xff, 0xbf,   /* PTE6 PE(6) */
122 		0xff, 0x7f,   /* PTE7 PE(7) */
123 	}, *t = matrix_switch;
124 	/* PD(x) :
125 	1.   0xcc0c & (1~(1 << (2*(x)+1)))))
126 	2.   (0xf0cf & 0xfffff) */
127 	/* PE(x) :
128 	1.   0xcc0c & 0xffff
129 	2.   0xf0cf & (1~(1 << (2*(x)+1))))) */
130 	unsigned short matrix_PDE[] = {
131 		0xcc04, 0xf0cf,  /* PD(1) */
132 		0xc40c, 0xf0cf,	 /* PD(5) */
133 		0x4c0c, 0xf0cf,  /* PD(7) */
134 		0xcc0c, 0xf0cd,  /* PE(0) */
135 		0xcc0c, 0xf0c7,	 /* PE(1) */
136 		0xcc0c, 0xf04f,  /* PE(3) */
137 		0xcc0c, 0xd0cf,	 /* PE(6) */
138 		0xcc0c, 0x70cf,	 /* PE(7) */
139 	}, *y = matrix_PDE;
140 
141 	/* Save these control reg bits */
142 	dc_static = (__raw_readw(PDCR) & (~0xcc0c));
143 	ec_static = (__raw_readw(PECR) & (~0xf0cf));
144 
145 	for (i = 0; i < 8; i++) {
146 		/* disable output for all but the one we want to scan */
147 		__raw_writew((dc_static | *y++), PDCR);
148 		__raw_writew((ec_static | *y++), PECR);
149 		udelay(5);
150 
151 		/* Get scanline row */
152 		__raw_writeb(*t++, PDDR);
153 		__raw_writeb(*t++, PEDR);
154 		udelay(50);
155 
156 		/* Read data */
157 		*s++ = __raw_readb(PCDR);
158 		*s++ = __raw_readb(PFDR);
159 	}
160 	/* Scan no lines */
161 	__raw_writeb(0xff, PDDR);
162 	__raw_writeb(0xff, PEDR);
163 
164 	/* Enable all scanlines */
165 	__raw_writew((dc_static | (0x5555 & 0xcc0c)),PDCR);
166 	__raw_writew((ec_static | (0x5555 & 0xf0cf)),PECR);
167 
168 	/* Ignore extra keys and events */
169 	*s++ = __raw_readb(PGDR);
170 	*s++ = __raw_readb(PHDR);
171 }
172 
173 static void jornadakbd680_poll(struct input_polled_dev *dev)
174 {
175 	struct jornadakbd *jornadakbd = dev->private;
176 
177 	jornada_scan_keyb(jornadakbd->new_scan);
178 	jornada_parse_kbd(jornadakbd);
179 	memcpy(jornadakbd->old_scan, jornadakbd->new_scan, JORNADA_SCAN_SIZE);
180 }
181 
182 static int jornada680kbd_probe(struct platform_device *pdev)
183 {
184 	struct jornadakbd *jornadakbd;
185 	struct input_polled_dev *poll_dev;
186 	struct input_dev *input_dev;
187 	int i, error;
188 
189 	jornadakbd = devm_kzalloc(&pdev->dev, sizeof(struct jornadakbd),
190 				  GFP_KERNEL);
191 	if (!jornadakbd)
192 		return -ENOMEM;
193 
194 	poll_dev = devm_input_allocate_polled_device(&pdev->dev);
195 	if (!poll_dev) {
196 		dev_err(&pdev->dev, "failed to allocate polled input device\n");
197 		return -ENOMEM;
198 	}
199 
200 	platform_set_drvdata(pdev, jornadakbd);
201 
202 	jornadakbd->poll_dev = poll_dev;
203 
204 	memcpy(jornadakbd->keymap, jornada_scancodes,
205 		sizeof(jornadakbd->keymap));
206 
207 	poll_dev->private = jornadakbd;
208 	poll_dev->poll = jornadakbd680_poll;
209 	poll_dev->poll_interval = 50; /* msec */
210 
211 	input_dev = poll_dev->input;
212 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
213 	input_dev->name = "HP Jornada 680 keyboard";
214 	input_dev->phys = "jornadakbd/input0";
215 	input_dev->keycode = jornadakbd->keymap;
216 	input_dev->keycodesize = sizeof(unsigned short);
217 	input_dev->keycodemax = ARRAY_SIZE(jornada_scancodes);
218 	input_dev->dev.parent = &pdev->dev;
219 	input_dev->id.bustype = BUS_HOST;
220 
221 	for (i = 0; i < 128; i++)
222 		if (jornadakbd->keymap[i])
223 			__set_bit(jornadakbd->keymap[i], input_dev->keybit);
224 	__clear_bit(KEY_RESERVED, input_dev->keybit);
225 
226 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
227 
228 	error = input_register_polled_device(jornadakbd->poll_dev);
229 	if (error) {
230 		dev_err(&pdev->dev, "failed to register polled input device\n");
231 		return error;
232 	}
233 
234 	return 0;
235 }
236 
237 static struct platform_driver jornada680kbd_driver = {
238 	.driver	= {
239 		.name	= "jornada680_kbd",
240 	},
241 	.probe	= jornada680kbd_probe,
242 };
243 module_platform_driver(jornada680kbd_driver);
244 
245 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
246 MODULE_DESCRIPTION("HP Jornada 620/660/680/690 Keyboard Driver");
247 MODULE_LICENSE("GPL v2");
248 MODULE_ALIAS("platform:jornada680_kbd");
249