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Linux/drivers/input/serio/altera_ps2.c

  1 /*
  2  * Altera University Program PS2 controller driver
  3  *
  4  * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
  5  *
  6  * Based on sa1111ps2.c, which is:
  7  * Copyright (C) 2002 Russell King
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/input.h>
 16 #include <linux/serio.h>
 17 #include <linux/interrupt.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/io.h>
 20 #include <linux/slab.h>
 21 #include <linux/of.h>
 22 
 23 #define DRV_NAME "altera_ps2"
 24 
 25 struct ps2if {
 26         struct serio *io;
 27         struct resource *iomem_res;
 28         void __iomem *base;
 29         unsigned irq;
 30 };
 31 
 32 /*
 33  * Read all bytes waiting in the PS2 port.  There should be
 34  * at the most one, but we loop for safety.
 35  */
 36 static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
 37 {
 38         struct ps2if *ps2if = dev_id;
 39         unsigned int status;
 40         int handled = IRQ_NONE;
 41 
 42         while ((status = readl(ps2if->base)) & 0xffff0000) {
 43                 serio_interrupt(ps2if->io, status & 0xff, 0);
 44                 handled = IRQ_HANDLED;
 45         }
 46 
 47         return handled;
 48 }
 49 
 50 /*
 51  * Write a byte to the PS2 port.
 52  */
 53 static int altera_ps2_write(struct serio *io, unsigned char val)
 54 {
 55         struct ps2if *ps2if = io->port_data;
 56 
 57         writel(val, ps2if->base);
 58         return 0;
 59 }
 60 
 61 static int altera_ps2_open(struct serio *io)
 62 {
 63         struct ps2if *ps2if = io->port_data;
 64 
 65         /* clear fifo */
 66         while (readl(ps2if->base) & 0xffff0000)
 67                 /* empty */;
 68 
 69         writel(1, ps2if->base + 4); /* enable rx irq */
 70         return 0;
 71 }
 72 
 73 static void altera_ps2_close(struct serio *io)
 74 {
 75         struct ps2if *ps2if = io->port_data;
 76 
 77         writel(0, ps2if->base); /* disable rx irq */
 78 }
 79 
 80 /*
 81  * Add one device to this driver.
 82  */
 83 static int altera_ps2_probe(struct platform_device *pdev)
 84 {
 85         struct ps2if *ps2if;
 86         struct serio *serio;
 87         int error, irq;
 88 
 89         ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
 90         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 91         if (!ps2if || !serio) {
 92                 error = -ENOMEM;
 93                 goto err_free_mem;
 94         }
 95 
 96         serio->id.type          = SERIO_8042;
 97         serio->write            = altera_ps2_write;
 98         serio->open             = altera_ps2_open;
 99         serio->close            = altera_ps2_close;
100         strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
101         strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
102         serio->port_data        = ps2if;
103         serio->dev.parent       = &pdev->dev;
104         ps2if->io               = serio;
105 
106         ps2if->iomem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107         if (ps2if->iomem_res == NULL) {
108                 error = -ENOENT;
109                 goto err_free_mem;
110         }
111 
112 
113         irq = platform_get_irq(pdev, 0);
114         if (irq < 0) {
115                 error = -ENXIO;
116                 goto err_free_mem;
117         }
118         ps2if->irq = irq;
119 
120         if (!request_mem_region(ps2if->iomem_res->start,
121                                 resource_size(ps2if->iomem_res), pdev->name)) {
122                 error = -EBUSY;
123                 goto err_free_mem;
124         }
125 
126         ps2if->base = ioremap(ps2if->iomem_res->start,
127                               resource_size(ps2if->iomem_res));
128         if (!ps2if->base) {
129                 error = -ENOMEM;
130                 goto err_free_res;
131         }
132 
133         error = request_irq(ps2if->irq, altera_ps2_rxint, 0, pdev->name, ps2if);
134         if (error) {
135                 dev_err(&pdev->dev, "could not allocate IRQ %d: %d\n",
136                         ps2if->irq, error);
137                 goto err_unmap;
138         }
139 
140         dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, ps2if->irq);
141 
142         serio_register_port(ps2if->io);
143         platform_set_drvdata(pdev, ps2if);
144 
145         return 0;
146 
147  err_unmap:
148         iounmap(ps2if->base);
149  err_free_res:
150         release_mem_region(ps2if->iomem_res->start,
151                            resource_size(ps2if->iomem_res));
152  err_free_mem:
153         kfree(ps2if);
154         kfree(serio);
155         return error;
156 }
157 
158 /*
159  * Remove one device from this driver.
160  */
161 static int altera_ps2_remove(struct platform_device *pdev)
162 {
163         struct ps2if *ps2if = platform_get_drvdata(pdev);
164 
165         serio_unregister_port(ps2if->io);
166         free_irq(ps2if->irq, ps2if);
167         iounmap(ps2if->base);
168         release_mem_region(ps2if->iomem_res->start,
169                            resource_size(ps2if->iomem_res));
170         kfree(ps2if);
171 
172         return 0;
173 }
174 
175 #ifdef CONFIG_OF
176 static const struct of_device_id altera_ps2_match[] = {
177         { .compatible = "ALTR,ps2-1.0", },
178         { .compatible = "altr,ps2-1.0", },
179         {},
180 };
181 MODULE_DEVICE_TABLE(of, altera_ps2_match);
182 #endif /* CONFIG_OF */
183 
184 /*
185  * Our device driver structure
186  */
187 static struct platform_driver altera_ps2_driver = {
188         .probe          = altera_ps2_probe,
189         .remove         = altera_ps2_remove,
190         .driver = {
191                 .name   = DRV_NAME,
192                 .owner  = THIS_MODULE,
193                 .of_match_table = of_match_ptr(altera_ps2_match),
194         },
195 };
196 module_platform_driver(altera_ps2_driver);
197 
198 MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
199 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
200 MODULE_LICENSE("GPL");
201 MODULE_ALIAS("platform:" DRV_NAME);
202 

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