2 * Driver for the enhanced rotary controller on pxa930 and pxa935
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/input.h>
14 #include <linux/platform_device.h>
17 #include <mach/pxa930_rotary.h>
22 #define SBCR_ERSB (1 << 5)
24 struct pxa930_rotary {
25 struct input_dev *input_dev;
26 void __iomem *mmio_base;
29 struct pxa930_rotary_platform_data *pdata;
32 static void clear_sbcr(struct pxa930_rotary *r)
34 uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);
36 __raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR);
37 __raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
40 static irqreturn_t rotary_irq(int irq, void *dev_id)
42 struct pxa930_rotary *r = dev_id;
43 struct pxa930_rotary_platform_data *pdata = r->pdata;
46 ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
49 delta = ercr - r->last_ercr;
55 if (pdata->up_key && pdata->down_key) {
56 key = (delta > 0) ? pdata->up_key : pdata->down_key;
57 input_report_key(r->input_dev, key, 1);
58 input_sync(r->input_dev);
59 input_report_key(r->input_dev, key, 0);
61 input_report_rel(r->input_dev, pdata->rel_code, delta);
63 input_sync(r->input_dev);
68 static int pxa930_rotary_open(struct input_dev *dev)
70 struct pxa930_rotary *r = input_get_drvdata(dev);
77 static void pxa930_rotary_close(struct input_dev *dev)
79 struct pxa930_rotary *r = input_get_drvdata(dev);
84 static int __devinit pxa930_rotary_probe(struct platform_device *pdev)
86 struct pxa930_rotary_platform_data *pdata = pdev->dev.platform_data;
87 struct pxa930_rotary *r;
88 struct input_dev *input_dev;
93 irq = platform_get_irq(pdev, 0);
95 dev_err(&pdev->dev, "no irq for rotary controller\n");
99 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101 dev_err(&pdev->dev, "no I/O memory defined\n");
106 dev_err(&pdev->dev, "no platform data defined\n");
110 r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL);
114 r->mmio_base = ioremap_nocache(res->start, resource_size(res));
115 if (r->mmio_base == NULL) {
116 dev_err(&pdev->dev, "failed to remap IO memory\n");
122 platform_set_drvdata(pdev, r);
124 /* allocate and register the input device */
125 input_dev = input_allocate_device();
127 dev_err(&pdev->dev, "failed to allocate input device\n");
132 input_dev->name = pdev->name;
133 input_dev->id.bustype = BUS_HOST;
134 input_dev->open = pxa930_rotary_open;
135 input_dev->close = pxa930_rotary_close;
136 input_dev->dev.parent = &pdev->dev;
138 if (pdata->up_key && pdata->down_key) {
139 __set_bit(pdata->up_key, input_dev->keybit);
140 __set_bit(pdata->down_key, input_dev->keybit);
141 __set_bit(EV_KEY, input_dev->evbit);
143 __set_bit(pdata->rel_code, input_dev->relbit);
144 __set_bit(EV_REL, input_dev->evbit);
147 r->input_dev = input_dev;
148 input_set_drvdata(input_dev, r);
150 err = request_irq(irq, rotary_irq, IRQF_DISABLED,
151 "enhanced rotary", r);
153 dev_err(&pdev->dev, "failed to request IRQ\n");
154 goto failed_free_input;
157 err = input_register_device(input_dev);
159 dev_err(&pdev->dev, "failed to register input device\n");
160 goto failed_free_irq;
168 input_free_device(input_dev);
170 iounmap(r->mmio_base);
176 static int __devexit pxa930_rotary_remove(struct platform_device *pdev)
178 struct pxa930_rotary *r = platform_get_drvdata(pdev);
180 free_irq(platform_get_irq(pdev, 0), r);
181 input_unregister_device(r->input_dev);
182 iounmap(r->mmio_base);
183 platform_set_drvdata(pdev, NULL);
189 static struct platform_driver pxa930_rotary_driver = {
191 .name = "pxa930-rotary",
192 .owner = THIS_MODULE,
194 .probe = pxa930_rotary_probe,
195 .remove = __devexit_p(pxa930_rotary_remove),
198 static int __init pxa930_rotary_init(void)
200 return platform_driver_register(&pxa930_rotary_driver);
202 module_init(pxa930_rotary_init);
204 static void __exit pxa930_rotary_exit(void)
206 platform_driver_unregister(&pxa930_rotary_driver);
208 module_exit(pxa930_rotary_exit);
210 MODULE_LICENSE("GPL");
211 MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
212 MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");