Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/input/keyboard/pxa930_rotary.c

  1 /*
  2  * Driver for the enhanced rotary controller on pxa930 and pxa935
  3  *
  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.
  7  */
  8 
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/interrupt.h>
 12 #include <linux/input.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/io.h>
 15 #include <linux/slab.h>
 16 
 17 #include <linux/platform_data/keyboard-pxa930_rotary.h>
 18 
 19 #define SBCR    (0x04)
 20 #define ERCR    (0x0c)
 21 
 22 #define SBCR_ERSB       (1 << 5)
 23 
 24 struct pxa930_rotary {
 25         struct input_dev        *input_dev;
 26         void __iomem            *mmio_base;
 27         int                     last_ercr;
 28 
 29         struct pxa930_rotary_platform_data *pdata;
 30 };
 31 
 32 static void clear_sbcr(struct pxa930_rotary *r)
 33 {
 34         uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);
 35 
 36         __raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR);
 37         __raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
 38 }
 39 
 40 static irqreturn_t rotary_irq(int irq, void *dev_id)
 41 {
 42         struct pxa930_rotary *r = dev_id;
 43         struct pxa930_rotary_platform_data *pdata = r->pdata;
 44         int ercr, delta, key;
 45 
 46         ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
 47         clear_sbcr(r);
 48 
 49         delta = ercr - r->last_ercr;
 50         if (delta == 0)
 51                 return IRQ_HANDLED;
 52 
 53         r->last_ercr = ercr;
 54 
 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);
 60         } else
 61                 input_report_rel(r->input_dev, pdata->rel_code, delta);
 62 
 63         input_sync(r->input_dev);
 64 
 65         return IRQ_HANDLED;
 66 }
 67 
 68 static int pxa930_rotary_open(struct input_dev *dev)
 69 {
 70         struct pxa930_rotary *r = input_get_drvdata(dev);
 71 
 72         clear_sbcr(r);
 73 
 74         return 0;
 75 }
 76 
 77 static void pxa930_rotary_close(struct input_dev *dev)
 78 {
 79         struct pxa930_rotary *r = input_get_drvdata(dev);
 80 
 81         clear_sbcr(r);
 82 }
 83 
 84 static int pxa930_rotary_probe(struct platform_device *pdev)
 85 {
 86         struct pxa930_rotary_platform_data *pdata =
 87                         dev_get_platdata(&pdev->dev);
 88         struct pxa930_rotary *r;
 89         struct input_dev *input_dev;
 90         struct resource *res;
 91         int irq;
 92         int err;
 93 
 94         irq = platform_get_irq(pdev, 0);
 95         if (irq < 0) {
 96                 dev_err(&pdev->dev, "no irq for rotary controller\n");
 97                 return -ENXIO;
 98         }
 99 
100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101         if (!res) {
102                 dev_err(&pdev->dev, "no I/O memory defined\n");
103                 return -ENXIO;
104         }
105 
106         if (!pdata) {
107                 dev_err(&pdev->dev, "no platform data defined\n");
108                 return -EINVAL;
109         }
110 
111         r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL);
112         if (!r)
113                 return -ENOMEM;
114 
115         r->mmio_base = ioremap_nocache(res->start, resource_size(res));
116         if (r->mmio_base == NULL) {
117                 dev_err(&pdev->dev, "failed to remap IO memory\n");
118                 err = -ENXIO;
119                 goto failed_free;
120         }
121 
122         r->pdata = pdata;
123         platform_set_drvdata(pdev, r);
124 
125         /* allocate and register the input device */
126         input_dev = input_allocate_device();
127         if (!input_dev) {
128                 dev_err(&pdev->dev, "failed to allocate input device\n");
129                 err = -ENOMEM;
130                 goto failed_free_io;
131         }
132 
133         input_dev->name = pdev->name;
134         input_dev->id.bustype = BUS_HOST;
135         input_dev->open = pxa930_rotary_open;
136         input_dev->close = pxa930_rotary_close;
137         input_dev->dev.parent = &pdev->dev;
138 
139         if (pdata->up_key && pdata->down_key) {
140                 __set_bit(pdata->up_key, input_dev->keybit);
141                 __set_bit(pdata->down_key, input_dev->keybit);
142                 __set_bit(EV_KEY, input_dev->evbit);
143         } else {
144                 __set_bit(pdata->rel_code, input_dev->relbit);
145                 __set_bit(EV_REL, input_dev->evbit);
146         }
147 
148         r->input_dev = input_dev;
149         input_set_drvdata(input_dev, r);
150 
151         err = request_irq(irq, rotary_irq, 0,
152                         "enhanced rotary", r);
153         if (err) {
154                 dev_err(&pdev->dev, "failed to request IRQ\n");
155                 goto failed_free_input;
156         }
157 
158         err = input_register_device(input_dev);
159         if (err) {
160                 dev_err(&pdev->dev, "failed to register input device\n");
161                 goto failed_free_irq;
162         }
163 
164         return 0;
165 
166 failed_free_irq:
167         free_irq(irq, r);
168 failed_free_input:
169         input_free_device(input_dev);
170 failed_free_io:
171         iounmap(r->mmio_base);
172 failed_free:
173         kfree(r);
174         return err;
175 }
176 
177 static int pxa930_rotary_remove(struct platform_device *pdev)
178 {
179         struct pxa930_rotary *r = platform_get_drvdata(pdev);
180 
181         free_irq(platform_get_irq(pdev, 0), r);
182         input_unregister_device(r->input_dev);
183         iounmap(r->mmio_base);
184         kfree(r);
185 
186         return 0;
187 }
188 
189 static struct platform_driver pxa930_rotary_driver = {
190         .driver         = {
191                 .name   = "pxa930-rotary",
192                 .owner  = THIS_MODULE,
193         },
194         .probe          = pxa930_rotary_probe,
195         .remove         = pxa930_rotary_remove,
196 };
197 module_platform_driver(pxa930_rotary_driver);
198 
199 MODULE_LICENSE("GPL");
200 MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
201 MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");
202 

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