Commit | Line | Data |
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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 | ||
105ca239 | 13 | #include <linux/input.h> |
105ca239 YY |
14 | #include <linux/interrupt.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/io.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
105ca239 YY |
20 | |
21 | #include <mach/hardware.h> | |
293b2da1 | 22 | #include <linux/platform_data/mouse-pxa930_trkball.h> |
105ca239 YY |
23 | |
24 | /* Trackball Controller Register Definitions */ | |
25 | #define TBCR (0x000C) | |
26 | #define TBCNTR (0x0010) | |
27 | #define TBSBC (0x0014) | |
28 | ||
29 | #define TBCR_TBRST (1 << 1) | |
30 | #define TBCR_TBSB (1 << 10) | |
31 | ||
32 | #define TBCR_Y_FLT(n) (((n) & 0xf) << 6) | |
33 | #define TBCR_X_FLT(n) (((n) & 0xf) << 2) | |
34 | ||
35 | #define TBCNTR_YM(n) (((n) >> 24) & 0xff) | |
36 | #define TBCNTR_YP(n) (((n) >> 16) & 0xff) | |
37 | #define TBCNTR_XM(n) (((n) >> 8) & 0xff) | |
38 | #define TBCNTR_XP(n) ((n) & 0xff) | |
39 | ||
40 | #define TBSBC_TBSBC (0x1) | |
41 | ||
42 | struct pxa930_trkball { | |
43 | struct pxa930_trkball_platform_data *pdata; | |
44 | ||
45 | /* Memory Mapped Register */ | |
46 | struct resource *mem; | |
47 | void __iomem *mmio_base; | |
48 | ||
49 | struct input_dev *input; | |
50 | }; | |
51 | ||
52 | static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id) | |
53 | { | |
54 | struct pxa930_trkball *trkball = dev_id; | |
55 | struct input_dev *input = trkball->input; | |
56 | int tbcntr, x, y; | |
57 | ||
58 | /* According to the spec software must read TBCNTR twice: | |
59 | * if the read value is the same, the reading is valid | |
60 | */ | |
61 | tbcntr = __raw_readl(trkball->mmio_base + TBCNTR); | |
62 | ||
63 | if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) { | |
64 | x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2; | |
65 | y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2; | |
66 | ||
67 | input_report_rel(input, REL_X, x); | |
68 | input_report_rel(input, REL_Y, y); | |
69 | input_sync(input); | |
70 | } | |
71 | ||
72 | __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); | |
73 | __raw_writel(0, trkball->mmio_base + TBSBC); | |
74 | ||
75 | return IRQ_HANDLED; | |
76 | } | |
77 | ||
78 | /* For TBCR, we need to wait for a while to make sure it has been modified. */ | |
79 | static int write_tbcr(struct pxa930_trkball *trkball, int v) | |
80 | { | |
81 | int i = 100; | |
82 | ||
83 | __raw_writel(v, trkball->mmio_base + TBCR); | |
84 | ||
bc34496d | 85 | while (--i) { |
105ca239 YY |
86 | if (__raw_readl(trkball->mmio_base + TBCR) == v) |
87 | break; | |
88 | msleep(1); | |
89 | } | |
90 | ||
91 | if (i == 0) { | |
92 | pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v); | |
93 | return -ETIMEDOUT; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static void pxa930_trkball_config(struct pxa930_trkball *trkball) | |
100 | { | |
101 | uint32_t tbcr; | |
102 | ||
103 | /* According to spec, need to write the filters of x,y to 0xf first! */ | |
104 | tbcr = __raw_readl(trkball->mmio_base + TBCR); | |
105 | write_tbcr(trkball, tbcr | TBCR_X_FLT(0xf) | TBCR_Y_FLT(0xf)); | |
106 | write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) | | |
107 | TBCR_Y_FLT(trkball->pdata->y_filter)); | |
108 | ||
109 | /* According to spec, set TBCR_TBRST first, before clearing it! */ | |
110 | tbcr = __raw_readl(trkball->mmio_base + TBCR); | |
111 | write_tbcr(trkball, tbcr | TBCR_TBRST); | |
112 | write_tbcr(trkball, tbcr & ~TBCR_TBRST); | |
113 | ||
114 | __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); | |
115 | __raw_writel(0, trkball->mmio_base + TBSBC); | |
116 | ||
117 | pr_debug("%s: final TBCR=%x!\n", __func__, | |
118 | __raw_readl(trkball->mmio_base + TBCR)); | |
119 | } | |
120 | ||
121 | static int pxa930_trkball_open(struct input_dev *dev) | |
122 | { | |
123 | struct pxa930_trkball *trkball = input_get_drvdata(dev); | |
124 | ||
125 | pxa930_trkball_config(trkball); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static void pxa930_trkball_disable(struct pxa930_trkball *trkball) | |
131 | { | |
132 | uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR); | |
133 | ||
134 | /* Held in reset, gate the 32-KHz input clock off */ | |
135 | write_tbcr(trkball, tbcr | TBCR_TBRST); | |
136 | } | |
137 | ||
138 | static void pxa930_trkball_close(struct input_dev *dev) | |
139 | { | |
140 | struct pxa930_trkball *trkball = input_get_drvdata(dev); | |
141 | ||
142 | pxa930_trkball_disable(trkball); | |
143 | } | |
144 | ||
5298cc4c | 145 | static int pxa930_trkball_probe(struct platform_device *pdev) |
105ca239 YY |
146 | { |
147 | struct pxa930_trkball *trkball; | |
148 | struct input_dev *input; | |
149 | struct resource *res; | |
150 | int irq, error; | |
151 | ||
152 | irq = platform_get_irq(pdev, 0); | |
153 | if (irq < 0) { | |
154 | dev_err(&pdev->dev, "failed to get trkball irq\n"); | |
155 | return -ENXIO; | |
156 | } | |
157 | ||
158 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
159 | if (!res) { | |
160 | dev_err(&pdev->dev, "failed to get register memory\n"); | |
161 | return -ENXIO; | |
162 | } | |
163 | ||
164 | trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL); | |
165 | if (!trkball) | |
166 | return -ENOMEM; | |
167 | ||
c838cb3d | 168 | trkball->pdata = dev_get_platdata(&pdev->dev); |
105ca239 YY |
169 | if (!trkball->pdata) { |
170 | dev_err(&pdev->dev, "no platform data defined\n"); | |
171 | error = -EINVAL; | |
172 | goto failed; | |
173 | } | |
174 | ||
175 | trkball->mmio_base = ioremap_nocache(res->start, resource_size(res)); | |
176 | if (!trkball->mmio_base) { | |
177 | dev_err(&pdev->dev, "failed to ioremap registers\n"); | |
178 | error = -ENXIO; | |
179 | goto failed; | |
180 | } | |
181 | ||
182 | /* held the module in reset, will be enabled in open() */ | |
183 | pxa930_trkball_disable(trkball); | |
184 | ||
ec4665c4 | 185 | error = request_irq(irq, pxa930_trkball_interrupt, 0, |
105ca239 YY |
186 | pdev->name, trkball); |
187 | if (error) { | |
d8f2f180 | 188 | dev_err(&pdev->dev, "failed to request irq: %d\n", error); |
105ca239 YY |
189 | goto failed_free_io; |
190 | } | |
191 | ||
192 | platform_set_drvdata(pdev, trkball); | |
193 | ||
194 | input = input_allocate_device(); | |
195 | if (!input) { | |
196 | dev_err(&pdev->dev, "failed to allocate input device\n"); | |
197 | error = -ENOMEM; | |
198 | goto failed_free_irq; | |
199 | } | |
200 | ||
201 | input->name = pdev->name; | |
202 | input->id.bustype = BUS_HOST; | |
203 | input->open = pxa930_trkball_open; | |
204 | input->close = pxa930_trkball_close; | |
205 | input->dev.parent = &pdev->dev; | |
206 | input_set_drvdata(input, trkball); | |
207 | ||
208 | trkball->input = input; | |
209 | ||
210 | input_set_capability(input, EV_REL, REL_X); | |
211 | input_set_capability(input, EV_REL, REL_Y); | |
212 | ||
213 | error = input_register_device(input); | |
214 | if (error) { | |
215 | dev_err(&pdev->dev, "unable to register input device\n"); | |
216 | goto failed_free_input; | |
217 | } | |
218 | ||
219 | return 0; | |
220 | ||
221 | failed_free_input: | |
222 | input_free_device(input); | |
223 | failed_free_irq: | |
224 | free_irq(irq, trkball); | |
225 | failed_free_io: | |
226 | iounmap(trkball->mmio_base); | |
227 | failed: | |
228 | kfree(trkball); | |
d8f2f180 | 229 | return error; |
105ca239 YY |
230 | } |
231 | ||
e2619cf7 | 232 | static int pxa930_trkball_remove(struct platform_device *pdev) |
105ca239 YY |
233 | { |
234 | struct pxa930_trkball *trkball = platform_get_drvdata(pdev); | |
235 | int irq = platform_get_irq(pdev, 0); | |
236 | ||
237 | input_unregister_device(trkball->input); | |
238 | free_irq(irq, trkball); | |
239 | iounmap(trkball->mmio_base); | |
240 | kfree(trkball); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static struct platform_driver pxa930_trkball_driver = { | |
246 | .driver = { | |
247 | .name = "pxa930-trkball", | |
248 | }, | |
249 | .probe = pxa930_trkball_probe, | |
1cb0aa88 | 250 | .remove = pxa930_trkball_remove, |
105ca239 | 251 | }; |
4fcdeac5 | 252 | module_platform_driver(pxa930_trkball_driver); |
105ca239 YY |
253 | |
254 | MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>"); | |
255 | MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver"); | |
256 | MODULE_LICENSE("GPL"); |