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>
16 #include <linux/slab.h>
18 #include <linux/platform_data/keyboard-pxa930_rotary.h>
23 #define SBCR_ERSB (1 << 5)
25 struct pxa930_rotary {
26 struct input_dev *input_dev;
27 void __iomem *mmio_base;
30 struct pxa930_rotary_platform_data *pdata;
33 static void clear_sbcr(struct pxa930_rotary *r)
35 uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);
37 __raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR);
38 __raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
41 static irqreturn_t rotary_irq(int irq, void *dev_id)
43 struct pxa930_rotary *r = dev_id;
44 struct pxa930_rotary_platform_data *pdata = r->pdata;
47 ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
50 delta = ercr - r->last_ercr;
56 if (pdata->up_key && pdata->down_key) {
57 key = (delta > 0) ? pdata->up_key : pdata->down_key;
58 input_report_key(r->input_dev, key, 1);
59 input_sync(r->input_dev);
60 input_report_key(r->input_dev, key, 0);
62 input_report_rel(r->input_dev, pdata->rel_code, delta);
64 input_sync(r->input_dev);
69 static int pxa930_rotary_open(struct input_dev *dev)
71 struct pxa930_rotary *r = input_get_drvdata(dev);
78 static void pxa930_rotary_close(struct input_dev *dev)
80 struct pxa930_rotary *r = input_get_drvdata(dev);
85 static int pxa930_rotary_probe(struct platform_device *pdev)
87 struct pxa930_rotary_platform_data *pdata =
88 dev_get_platdata(&pdev->dev);
89 struct pxa930_rotary *r;
90 struct input_dev *input_dev;
95 irq = platform_get_irq(pdev, 0);
97 dev_err(&pdev->dev, "no irq for rotary controller\n");
101 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103 dev_err(&pdev->dev, "no I/O memory defined\n");
108 dev_err(&pdev->dev, "no platform data defined\n");
112 r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL);
116 r->mmio_base = ioremap_nocache(res->start, resource_size(res));
117 if (r->mmio_base == NULL) {
118 dev_err(&pdev->dev, "failed to remap IO memory\n");
124 platform_set_drvdata(pdev, r);
126 /* allocate and register the input device */
127 input_dev = input_allocate_device();
129 dev_err(&pdev->dev, "failed to allocate input device\n");
134 input_dev->name = pdev->name;
135 input_dev->id.bustype = BUS_HOST;
136 input_dev->open = pxa930_rotary_open;
137 input_dev->close = pxa930_rotary_close;
138 input_dev->dev.parent = &pdev->dev;
140 if (pdata->up_key && pdata->down_key) {
141 __set_bit(pdata->up_key, input_dev->keybit);
142 __set_bit(pdata->down_key, input_dev->keybit);
143 __set_bit(EV_KEY, input_dev->evbit);
145 __set_bit(pdata->rel_code, input_dev->relbit);
146 __set_bit(EV_REL, input_dev->evbit);
149 r->input_dev = input_dev;
150 input_set_drvdata(input_dev, r);
152 err = request_irq(irq, rotary_irq, 0,
153 "enhanced rotary", r);
155 dev_err(&pdev->dev, "failed to request IRQ\n");
156 goto failed_free_input;
159 err = input_register_device(input_dev);
161 dev_err(&pdev->dev, "failed to register input device\n");
162 goto failed_free_irq;
170 input_free_device(input_dev);
172 iounmap(r->mmio_base);
178 static int pxa930_rotary_remove(struct platform_device *pdev)
180 struct pxa930_rotary *r = platform_get_drvdata(pdev);
182 free_irq(platform_get_irq(pdev, 0), r);
183 input_unregister_device(r->input_dev);
184 iounmap(r->mmio_base);
190 static struct platform_driver pxa930_rotary_driver = {
192 .name = "pxa930-rotary",
193 .owner = THIS_MODULE,
195 .probe = pxa930_rotary_probe,
196 .remove = pxa930_rotary_remove,
198 module_platform_driver(pxa930_rotary_driver);
200 MODULE_LICENSE("GPL");
201 MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
202 MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");