Commit | Line | Data |
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e0ee6298 YY |
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/init.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/input.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/io.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
e0ee6298 YY |
17 | |
18 | #include <mach/pxa930_rotary.h> | |
19 | ||
20 | #define SBCR (0x04) | |
21 | #define ERCR (0x0c) | |
22 | ||
23 | #define SBCR_ERSB (1 << 5) | |
24 | ||
25 | struct pxa930_rotary { | |
26 | struct input_dev *input_dev; | |
27 | void __iomem *mmio_base; | |
28 | int last_ercr; | |
29 | ||
30 | struct pxa930_rotary_platform_data *pdata; | |
31 | }; | |
32 | ||
33 | static void clear_sbcr(struct pxa930_rotary *r) | |
34 | { | |
35 | uint32_t sbcr = __raw_readl(r->mmio_base + SBCR); | |
36 | ||
37 | __raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR); | |
38 | __raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR); | |
39 | } | |
40 | ||
41 | static irqreturn_t rotary_irq(int irq, void *dev_id) | |
42 | { | |
43 | struct pxa930_rotary *r = dev_id; | |
44 | struct pxa930_rotary_platform_data *pdata = r->pdata; | |
45 | int ercr, delta, key; | |
46 | ||
47 | ercr = __raw_readl(r->mmio_base + ERCR) & 0xf; | |
48 | clear_sbcr(r); | |
49 | ||
50 | delta = ercr - r->last_ercr; | |
51 | if (delta == 0) | |
52 | return IRQ_HANDLED; | |
53 | ||
54 | r->last_ercr = ercr; | |
55 | ||
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); | |
61 | } else | |
62 | input_report_rel(r->input_dev, pdata->rel_code, delta); | |
63 | ||
64 | input_sync(r->input_dev); | |
65 | ||
66 | return IRQ_HANDLED; | |
67 | } | |
68 | ||
69 | static int pxa930_rotary_open(struct input_dev *dev) | |
70 | { | |
71 | struct pxa930_rotary *r = input_get_drvdata(dev); | |
72 | ||
73 | clear_sbcr(r); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static void pxa930_rotary_close(struct input_dev *dev) | |
79 | { | |
80 | struct pxa930_rotary *r = input_get_drvdata(dev); | |
81 | ||
82 | clear_sbcr(r); | |
83 | } | |
84 | ||
85 | static int __devinit pxa930_rotary_probe(struct platform_device *pdev) | |
86 | { | |
87 | struct pxa930_rotary_platform_data *pdata = pdev->dev.platform_data; | |
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 | ||
ec4665c4 | 151 | err = request_irq(irq, rotary_irq, 0, |
e0ee6298 YY |
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 __devexit 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 | platform_set_drvdata(pdev, NULL); | |
185 | kfree(r); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static struct platform_driver pxa930_rotary_driver = { | |
191 | .driver = { | |
192 | .name = "pxa930-rotary", | |
193 | .owner = THIS_MODULE, | |
194 | }, | |
195 | .probe = pxa930_rotary_probe, | |
196 | .remove = __devexit_p(pxa930_rotary_remove), | |
197 | }; | |
5146c84f | 198 | module_platform_driver(pxa930_rotary_driver); |
e0ee6298 YY |
199 | |
200 | MODULE_LICENSE("GPL"); | |
201 | MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller"); | |
202 | MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>"); |