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Linux/drivers/input/mouse/pxa930_trkball.c

  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/input.h>
 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>
 19 #include <linux/slab.h>
 20 
 21 #include <mach/hardware.h>
 22 #include <linux/platform_data/mouse-pxa930_trkball.h>
 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 
 85         while (--i) {
 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 
145 static int pxa930_trkball_probe(struct platform_device *pdev)
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 
168         trkball->pdata = dev_get_platdata(&pdev->dev);
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 
185         error = request_irq(irq, pxa930_trkball_interrupt, 0,
186                             pdev->name, trkball);
187         if (error) {
188                 dev_err(&pdev->dev, "failed to request irq: %d\n", error);
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);
229         return error;
230 }
231 
232 static int pxa930_trkball_remove(struct platform_device *pdev)
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,
250         .remove         = pxa930_trkball_remove,
251 };
252 module_platform_driver(pxa930_trkball_driver);
253 
254 MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>");
255 MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver");
256 MODULE_LICENSE("GPL");
257 

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