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Linux/drivers/input/misc/bfin_rotary.c

  1 /*
  2  * Rotary counter driver for Analog Devices Blackfin Processors
  3  *
  4  * Copyright 2008-2009 Analog Devices Inc.
  5  * Licensed under the GPL-2 or later.
  6  */
  7 
  8 #include <linux/module.h>
  9 #include <linux/interrupt.h>
 10 #include <linux/irq.h>
 11 #include <linux/pm.h>
 12 #include <linux/platform_device.h>
 13 #include <linux/input.h>
 14 #include <linux/slab.h>
 15 
 16 #include <asm/portmux.h>
 17 #include <asm/bfin_rotary.h>
 18 
 19 static const u16 per_cnt[] = {
 20         P_CNT_CUD,
 21         P_CNT_CDG,
 22         P_CNT_CZM,
 23         0
 24 };
 25 
 26 struct bfin_rot {
 27         struct input_dev *input;
 28         int irq;
 29         unsigned int up_key;
 30         unsigned int down_key;
 31         unsigned int button_key;
 32         unsigned int rel_code;
 33         unsigned short cnt_config;
 34         unsigned short cnt_imask;
 35         unsigned short cnt_debounce;
 36 };
 37 
 38 static void report_key_event(struct input_dev *input, int keycode)
 39 {
 40         /* simulate a press-n-release */
 41         input_report_key(input, keycode, 1);
 42         input_sync(input);
 43         input_report_key(input, keycode, 0);
 44         input_sync(input);
 45 }
 46 
 47 static void report_rotary_event(struct bfin_rot *rotary, int delta)
 48 {
 49         struct input_dev *input = rotary->input;
 50 
 51         if (rotary->up_key) {
 52                 report_key_event(input,
 53                                  delta > 0 ? rotary->up_key : rotary->down_key);
 54         } else {
 55                 input_report_rel(input, rotary->rel_code, delta);
 56                 input_sync(input);
 57         }
 58 }
 59 
 60 static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
 61 {
 62         struct platform_device *pdev = dev_id;
 63         struct bfin_rot *rotary = platform_get_drvdata(pdev);
 64         int delta;
 65 
 66         switch (bfin_read_CNT_STATUS()) {
 67 
 68         case ICII:
 69                 break;
 70 
 71         case UCII:
 72         case DCII:
 73                 delta = bfin_read_CNT_COUNTER();
 74                 if (delta)
 75                         report_rotary_event(rotary, delta);
 76                 break;
 77 
 78         case CZMII:
 79                 report_key_event(rotary->input, rotary->button_key);
 80                 break;
 81 
 82         default:
 83                 break;
 84         }
 85 
 86         bfin_write_CNT_COMMAND(W1LCNT_ZERO);    /* Clear COUNTER */
 87         bfin_write_CNT_STATUS(-1);      /* Clear STATUS */
 88 
 89         return IRQ_HANDLED;
 90 }
 91 
 92 static int bfin_rotary_probe(struct platform_device *pdev)
 93 {
 94         struct bfin_rotary_platform_data *pdata = dev_get_platdata(&pdev->dev);
 95         struct bfin_rot *rotary;
 96         struct input_dev *input;
 97         int error;
 98 
 99         /* Basic validation */
100         if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
101             (!pdata->rotary_up_key && pdata->rotary_down_key)) {
102                 return -EINVAL;
103         }
104 
105         error = peripheral_request_list(per_cnt, dev_name(&pdev->dev));
106         if (error) {
107                 dev_err(&pdev->dev, "requesting peripherals failed\n");
108                 return error;
109         }
110 
111         rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL);
112         input = input_allocate_device();
113         if (!rotary || !input) {
114                 error = -ENOMEM;
115                 goto out1;
116         }
117 
118         rotary->input = input;
119 
120         rotary->up_key = pdata->rotary_up_key;
121         rotary->down_key = pdata->rotary_down_key;
122         rotary->button_key = pdata->rotary_button_key;
123         rotary->rel_code = pdata->rotary_rel_code;
124 
125         error = rotary->irq = platform_get_irq(pdev, 0);
126         if (error < 0)
127                 goto out1;
128 
129         input->name = pdev->name;
130         input->phys = "bfin-rotary/input0";
131         input->dev.parent = &pdev->dev;
132 
133         input_set_drvdata(input, rotary);
134 
135         input->id.bustype = BUS_HOST;
136         input->id.vendor = 0x0001;
137         input->id.product = 0x0001;
138         input->id.version = 0x0100;
139 
140         if (rotary->up_key) {
141                 __set_bit(EV_KEY, input->evbit);
142                 __set_bit(rotary->up_key, input->keybit);
143                 __set_bit(rotary->down_key, input->keybit);
144         } else {
145                 __set_bit(EV_REL, input->evbit);
146                 __set_bit(rotary->rel_code, input->relbit);
147         }
148 
149         if (rotary->button_key) {
150                 __set_bit(EV_KEY, input->evbit);
151                 __set_bit(rotary->button_key, input->keybit);
152         }
153 
154         error = request_irq(rotary->irq, bfin_rotary_isr,
155                             0, dev_name(&pdev->dev), pdev);
156         if (error) {
157                 dev_err(&pdev->dev,
158                         "unable to claim irq %d; error %d\n",
159                         rotary->irq, error);
160                 goto out1;
161         }
162 
163         error = input_register_device(input);
164         if (error) {
165                 dev_err(&pdev->dev,
166                         "unable to register input device (%d)\n", error);
167                 goto out2;
168         }
169 
170         if (pdata->rotary_button_key)
171                 bfin_write_CNT_IMASK(CZMIE);
172 
173         if (pdata->mode & ROT_DEBE)
174                 bfin_write_CNT_DEBOUNCE(pdata->debounce & DPRESCALE);
175 
176         if (pdata->mode)
177                 bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() |
178                                         (pdata->mode & ~CNTE));
179 
180         bfin_write_CNT_IMASK(bfin_read_CNT_IMASK() | UCIE | DCIE);
181         bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | CNTE);
182 
183         platform_set_drvdata(pdev, rotary);
184         device_init_wakeup(&pdev->dev, 1);
185 
186         return 0;
187 
188 out2:
189         free_irq(rotary->irq, pdev);
190 out1:
191         input_free_device(input);
192         kfree(rotary);
193         peripheral_free_list(per_cnt);
194 
195         return error;
196 }
197 
198 static int bfin_rotary_remove(struct platform_device *pdev)
199 {
200         struct bfin_rot *rotary = platform_get_drvdata(pdev);
201 
202         bfin_write_CNT_CONFIG(0);
203         bfin_write_CNT_IMASK(0);
204 
205         free_irq(rotary->irq, pdev);
206         input_unregister_device(rotary->input);
207         peripheral_free_list(per_cnt);
208 
209         kfree(rotary);
210 
211         return 0;
212 }
213 
214 #ifdef CONFIG_PM
215 static int bfin_rotary_suspend(struct device *dev)
216 {
217         struct platform_device *pdev = to_platform_device(dev);
218         struct bfin_rot *rotary = platform_get_drvdata(pdev);
219 
220         rotary->cnt_config = bfin_read_CNT_CONFIG();
221         rotary->cnt_imask = bfin_read_CNT_IMASK();
222         rotary->cnt_debounce = bfin_read_CNT_DEBOUNCE();
223 
224         if (device_may_wakeup(&pdev->dev))
225                 enable_irq_wake(rotary->irq);
226 
227         return 0;
228 }
229 
230 static int bfin_rotary_resume(struct device *dev)
231 {
232         struct platform_device *pdev = to_platform_device(dev);
233         struct bfin_rot *rotary = platform_get_drvdata(pdev);
234 
235         bfin_write_CNT_DEBOUNCE(rotary->cnt_debounce);
236         bfin_write_CNT_IMASK(rotary->cnt_imask);
237         bfin_write_CNT_CONFIG(rotary->cnt_config & ~CNTE);
238 
239         if (device_may_wakeup(&pdev->dev))
240                 disable_irq_wake(rotary->irq);
241 
242         if (rotary->cnt_config & CNTE)
243                 bfin_write_CNT_CONFIG(rotary->cnt_config);
244 
245         return 0;
246 }
247 
248 static const struct dev_pm_ops bfin_rotary_pm_ops = {
249         .suspend        = bfin_rotary_suspend,
250         .resume         = bfin_rotary_resume,
251 };
252 #endif
253 
254 static struct platform_driver bfin_rotary_device_driver = {
255         .probe          = bfin_rotary_probe,
256         .remove         = bfin_rotary_remove,
257         .driver         = {
258                 .name   = "bfin-rotary",
259                 .owner  = THIS_MODULE,
260 #ifdef CONFIG_PM
261                 .pm     = &bfin_rotary_pm_ops,
262 #endif
263         },
264 };
265 module_platform_driver(bfin_rotary_device_driver);
266 
267 MODULE_LICENSE("GPL");
268 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
269 MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
270 MODULE_ALIAS("platform:bfin-rotary");
271 

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