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105ca239 YY |
1 | /* |
2 | * PXA930 track ball mouse driver | |
3 | * | |
4 | * Copyright (C) 2007 Marvell International Ltd. | |
5 | * 2008-02-28: Yong Yao <yaoyong@marvell.com> | |
6 | * initial version | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/input.h> | |
15 | #include <linux/version.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/io.h> | |
21 | ||
22 | #include <mach/hardware.h> | |
23 | #include <mach/pxa930_trkball.h> | |
24 | ||
25 | /* Trackball Controller Register Definitions */ | |
26 | #define TBCR (0x000C) | |
27 | #define TBCNTR (0x0010) | |
28 | #define TBSBC (0x0014) | |
29 | ||
30 | #define TBCR_TBRST (1 << 1) | |
31 | #define TBCR_TBSB (1 << 10) | |
32 | ||
33 | #define TBCR_Y_FLT(n) (((n) & 0xf) << 6) | |
34 | #define TBCR_X_FLT(n) (((n) & 0xf) << 2) | |
35 | ||
36 | #define TBCNTR_YM(n) (((n) >> 24) & 0xff) | |
37 | #define TBCNTR_YP(n) (((n) >> 16) & 0xff) | |
38 | #define TBCNTR_XM(n) (((n) >> 8) & 0xff) | |
39 | #define TBCNTR_XP(n) ((n) & 0xff) | |
40 | ||
41 | #define TBSBC_TBSBC (0x1) | |
42 | ||
43 | struct pxa930_trkball { | |
44 | struct pxa930_trkball_platform_data *pdata; | |
45 | ||
46 | /* Memory Mapped Register */ | |
47 | struct resource *mem; | |
48 | void __iomem *mmio_base; | |
49 | ||
50 | struct input_dev *input; | |
51 | }; | |
52 | ||
53 | static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id) | |
54 | { | |
55 | struct pxa930_trkball *trkball = dev_id; | |
56 | struct input_dev *input = trkball->input; | |
57 | int tbcntr, x, y; | |
58 | ||
59 | /* According to the spec software must read TBCNTR twice: | |
60 | * if the read value is the same, the reading is valid | |
61 | */ | |
62 | tbcntr = __raw_readl(trkball->mmio_base + TBCNTR); | |
63 | ||
64 | if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) { | |
65 | x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2; | |
66 | y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2; | |
67 | ||
68 | input_report_rel(input, REL_X, x); | |
69 | input_report_rel(input, REL_Y, y); | |
70 | input_sync(input); | |
71 | } | |
72 | ||
73 | __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); | |
74 | __raw_writel(0, trkball->mmio_base + TBSBC); | |
75 | ||
76 | return IRQ_HANDLED; | |
77 | } | |
78 | ||
79 | /* For TBCR, we need to wait for a while to make sure it has been modified. */ | |
80 | static int write_tbcr(struct pxa930_trkball *trkball, int v) | |
81 | { | |
82 | int i = 100; | |
83 | ||
84 | __raw_writel(v, trkball->mmio_base + TBCR); | |
85 | ||
bc34496d | 86 | while (--i) { |
105ca239 YY |
87 | if (__raw_readl(trkball->mmio_base + TBCR) == v) |
88 | break; | |
89 | msleep(1); | |
90 | } | |
91 | ||
92 | if (i == 0) { | |
93 | pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v); | |
94 | return -ETIMEDOUT; | |
95 | } | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static void pxa930_trkball_config(struct pxa930_trkball *trkball) | |
101 | { | |
102 | uint32_t tbcr; | |
103 | ||
104 | /* According to spec, need to write the filters of x,y to 0xf first! */ | |
105 | tbcr = __raw_readl(trkball->mmio_base + TBCR); | |
106 | write_tbcr(trkball, tbcr | TBCR_X_FLT(0xf) | TBCR_Y_FLT(0xf)); | |
107 | write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) | | |
108 | TBCR_Y_FLT(trkball->pdata->y_filter)); | |
109 | ||
110 | /* According to spec, set TBCR_TBRST first, before clearing it! */ | |
111 | tbcr = __raw_readl(trkball->mmio_base + TBCR); | |
112 | write_tbcr(trkball, tbcr | TBCR_TBRST); | |
113 | write_tbcr(trkball, tbcr & ~TBCR_TBRST); | |
114 | ||
115 | __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); | |
116 | __raw_writel(0, trkball->mmio_base + TBSBC); | |
117 | ||
118 | pr_debug("%s: final TBCR=%x!\n", __func__, | |
119 | __raw_readl(trkball->mmio_base + TBCR)); | |
120 | } | |
121 | ||
122 | static int pxa930_trkball_open(struct input_dev *dev) | |
123 | { | |
124 | struct pxa930_trkball *trkball = input_get_drvdata(dev); | |
125 | ||
126 | pxa930_trkball_config(trkball); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static void pxa930_trkball_disable(struct pxa930_trkball *trkball) | |
132 | { | |
133 | uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR); | |
134 | ||
135 | /* Held in reset, gate the 32-KHz input clock off */ | |
136 | write_tbcr(trkball, tbcr | TBCR_TBRST); | |
137 | } | |
138 | ||
139 | static void pxa930_trkball_close(struct input_dev *dev) | |
140 | { | |
141 | struct pxa930_trkball *trkball = input_get_drvdata(dev); | |
142 | ||
143 | pxa930_trkball_disable(trkball); | |
144 | } | |
145 | ||
146 | static int __devinit pxa930_trkball_probe(struct platform_device *pdev) | |
147 | { | |
148 | struct pxa930_trkball *trkball; | |
149 | struct input_dev *input; | |
150 | struct resource *res; | |
151 | int irq, error; | |
152 | ||
153 | irq = platform_get_irq(pdev, 0); | |
154 | if (irq < 0) { | |
155 | dev_err(&pdev->dev, "failed to get trkball irq\n"); | |
156 | return -ENXIO; | |
157 | } | |
158 | ||
159 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
160 | if (!res) { | |
161 | dev_err(&pdev->dev, "failed to get register memory\n"); | |
162 | return -ENXIO; | |
163 | } | |
164 | ||
165 | trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL); | |
166 | if (!trkball) | |
167 | return -ENOMEM; | |
168 | ||
169 | trkball->pdata = pdev->dev.platform_data; | |
170 | if (!trkball->pdata) { | |
171 | dev_err(&pdev->dev, "no platform data defined\n"); | |
172 | error = -EINVAL; | |
173 | goto failed; | |
174 | } | |
175 | ||
176 | trkball->mmio_base = ioremap_nocache(res->start, resource_size(res)); | |
177 | if (!trkball->mmio_base) { | |
178 | dev_err(&pdev->dev, "failed to ioremap registers\n"); | |
179 | error = -ENXIO; | |
180 | goto failed; | |
181 | } | |
182 | ||
183 | /* held the module in reset, will be enabled in open() */ | |
184 | pxa930_trkball_disable(trkball); | |
185 | ||
186 | error = request_irq(irq, pxa930_trkball_interrupt, IRQF_DISABLED, | |
187 | pdev->name, trkball); | |
188 | if (error) { | |
189 | dev_err(&pdev->dev, "failed to request irq: %d\n", ret); | |
190 | goto failed_free_io; | |
191 | } | |
192 | ||
193 | platform_set_drvdata(pdev, trkball); | |
194 | ||
195 | input = input_allocate_device(); | |
196 | if (!input) { | |
197 | dev_err(&pdev->dev, "failed to allocate input device\n"); | |
198 | error = -ENOMEM; | |
199 | goto failed_free_irq; | |
200 | } | |
201 | ||
202 | input->name = pdev->name; | |
203 | input->id.bustype = BUS_HOST; | |
204 | input->open = pxa930_trkball_open; | |
205 | input->close = pxa930_trkball_close; | |
206 | input->dev.parent = &pdev->dev; | |
207 | input_set_drvdata(input, trkball); | |
208 | ||
209 | trkball->input = input; | |
210 | ||
211 | input_set_capability(input, EV_REL, REL_X); | |
212 | input_set_capability(input, EV_REL, REL_Y); | |
213 | ||
214 | error = input_register_device(input); | |
215 | if (error) { | |
216 | dev_err(&pdev->dev, "unable to register input device\n"); | |
217 | goto failed_free_input; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | ||
222 | failed_free_input: | |
223 | input_free_device(input); | |
224 | failed_free_irq: | |
225 | free_irq(irq, trkball); | |
226 | failed_free_io: | |
227 | iounmap(trkball->mmio_base); | |
228 | failed: | |
229 | kfree(trkball); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | static int __devexit pxa930_trkball_remove(struct platform_device *pdev) | |
234 | { | |
235 | struct pxa930_trkball *trkball = platform_get_drvdata(pdev); | |
236 | int irq = platform_get_irq(pdev, 0); | |
237 | ||
238 | input_unregister_device(trkball->input); | |
239 | free_irq(irq, trkball); | |
240 | iounmap(trkball->mmio_base); | |
241 | kfree(trkball); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static struct platform_driver pxa930_trkball_driver = { | |
247 | .driver = { | |
248 | .name = "pxa930-trkball", | |
249 | }, | |
250 | .probe = pxa930_trkball_probe, | |
251 | .remove = __devexit_p(pxa930_trkball_remove), | |
252 | }; | |
253 | ||
254 | static int __init pxa930_trkball_init(void) | |
255 | { | |
256 | return platform_driver_register(&pxa930_trkball_driver); | |
257 | } | |
258 | ||
259 | static void __exit pxa930_trkball_exit(void) | |
260 | { | |
261 | platform_driver_unregister(&pxa930_trkball_driver); | |
262 | } | |
263 | ||
264 | module_init(pxa930_trkball_init); | |
265 | module_exit(pxa930_trkball_exit); | |
266 | ||
267 | MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>"); | |
268 | MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver"); | |
269 | MODULE_LICENSE("GPL"); |