Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0

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/io.h>
 11 #include <linux/irq.h>
 12 #include <linux/pm.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/input.h>
 15 #include <linux/slab.h>
 16 #include <linux/platform_data/bfin_rotary.h>
 17 
 18 #include <asm/portmux.h>
 19 
 20 #define CNT_CONFIG_OFF          0       /* CNT Config Offset */
 21 #define CNT_IMASK_OFF           4       /* CNT Interrupt Mask Offset */
 22 #define CNT_STATUS_OFF          8       /* CNT Status Offset */
 23 #define CNT_COMMAND_OFF         12      /* CNT Command Offset */
 24 #define CNT_DEBOUNCE_OFF        16      /* CNT Debounce Offset */
 25 #define CNT_COUNTER_OFF         20      /* CNT Counter Offset */
 26 #define CNT_MAX_OFF             24      /* CNT Maximum Count Offset */
 27 #define CNT_MIN_OFF             28      /* CNT Minimum Count Offset */
 28 
 29 struct bfin_rot {
 30         struct input_dev *input;
 31         void __iomem *base;
 32         int irq;
 33         unsigned int up_key;
 34         unsigned int down_key;
 35         unsigned int button_key;
 36         unsigned int rel_code;
 37 
 38         unsigned short mode;
 39         unsigned short debounce;
 40 
 41         unsigned short cnt_config;
 42         unsigned short cnt_imask;
 43         unsigned short cnt_debounce;
 44 };
 45 
 46 static void report_key_event(struct input_dev *input, int keycode)
 47 {
 48         /* simulate a press-n-release */
 49         input_report_key(input, keycode, 1);
 50         input_sync(input);
 51         input_report_key(input, keycode, 0);
 52         input_sync(input);
 53 }
 54 
 55 static void report_rotary_event(struct bfin_rot *rotary, int delta)
 56 {
 57         struct input_dev *input = rotary->input;
 58 
 59         if (rotary->up_key) {
 60                 report_key_event(input,
 61                                  delta > 0 ? rotary->up_key : rotary->down_key);
 62         } else {
 63                 input_report_rel(input, rotary->rel_code, delta);
 64                 input_sync(input);
 65         }
 66 }
 67 
 68 static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
 69 {
 70         struct bfin_rot *rotary = dev_id;
 71         int delta;
 72 
 73         switch (readw(rotary->base + CNT_STATUS_OFF)) {
 74 
 75         case ICII:
 76                 break;
 77 
 78         case UCII:
 79         case DCII:
 80                 delta = readl(rotary->base + CNT_COUNTER_OFF);
 81                 if (delta)
 82                         report_rotary_event(rotary, delta);
 83                 break;
 84 
 85         case CZMII:
 86                 report_key_event(rotary->input, rotary->button_key);
 87                 break;
 88 
 89         default:
 90                 break;
 91         }
 92 
 93         writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
 94         writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
 95 
 96         return IRQ_HANDLED;
 97 }
 98 
 99 static int bfin_rotary_open(struct input_dev *input)
100 {
101         struct bfin_rot *rotary = input_get_drvdata(input);
102         unsigned short val;
103 
104         if (rotary->mode & ROT_DEBE)
105                 writew(rotary->debounce & DPRESCALE,
106                         rotary->base + CNT_DEBOUNCE_OFF);
107 
108         writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF);
109 
110         val = UCIE | DCIE;
111         if (rotary->button_key)
112                 val |= CZMIE;
113         writew(val, rotary->base + CNT_IMASK_OFF);
114 
115         writew(rotary->mode | CNTE, rotary->base + CNT_CONFIG_OFF);
116 
117         return 0;
118 }
119 
120 static void bfin_rotary_close(struct input_dev *input)
121 {
122         struct bfin_rot *rotary = input_get_drvdata(input);
123 
124         writew(0, rotary->base + CNT_CONFIG_OFF);
125         writew(0, rotary->base + CNT_IMASK_OFF);
126 }
127 
128 static void bfin_rotary_free_action(void *data)
129 {
130         peripheral_free_list(data);
131 }
132 
133 static int bfin_rotary_probe(struct platform_device *pdev)
134 {
135         struct device *dev = &pdev->dev;
136         const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
137         struct bfin_rot *rotary;
138         struct resource *res;
139         struct input_dev *input;
140         int error;
141 
142         /* Basic validation */
143         if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
144             (!pdata->rotary_up_key && pdata->rotary_down_key)) {
145                 return -EINVAL;
146         }
147 
148         if (pdata->pin_list) {
149                 error = peripheral_request_list(pdata->pin_list,
150                                                 dev_name(&pdev->dev));
151                 if (error) {
152                         dev_err(dev, "requesting peripherals failed: %d\n",
153                                 error);
154                         return error;
155                 }
156 
157                 error = devm_add_action(dev, bfin_rotary_free_action,
158                                         pdata->pin_list);
159                 if (error) {
160                         dev_err(dev, "setting cleanup action failed: %d\n",
161                                 error);
162                         peripheral_free_list(pdata->pin_list);
163                         return error;
164                 }
165         }
166 
167         rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
168         if (!rotary)
169                 return -ENOMEM;
170 
171         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172         rotary->base = devm_ioremap_resource(dev, res);
173         if (IS_ERR(rotary->base))
174                 return PTR_ERR(rotary->base);
175 
176         input = devm_input_allocate_device(dev);
177         if (!input)
178                 return -ENOMEM;
179 
180         rotary->input = input;
181 
182         rotary->up_key = pdata->rotary_up_key;
183         rotary->down_key = pdata->rotary_down_key;
184         rotary->button_key = pdata->rotary_button_key;
185         rotary->rel_code = pdata->rotary_rel_code;
186 
187         rotary->mode = pdata->mode;
188         rotary->debounce = pdata->debounce;
189 
190         input->name = pdev->name;
191         input->phys = "bfin-rotary/input0";
192         input->dev.parent = &pdev->dev;
193 
194         input_set_drvdata(input, rotary);
195 
196         input->id.bustype = BUS_HOST;
197         input->id.vendor = 0x0001;
198         input->id.product = 0x0001;
199         input->id.version = 0x0100;
200 
201         input->open = bfin_rotary_open;
202         input->close = bfin_rotary_close;
203 
204         if (rotary->up_key) {
205                 __set_bit(EV_KEY, input->evbit);
206                 __set_bit(rotary->up_key, input->keybit);
207                 __set_bit(rotary->down_key, input->keybit);
208         } else {
209                 __set_bit(EV_REL, input->evbit);
210                 __set_bit(rotary->rel_code, input->relbit);
211         }
212 
213         if (rotary->button_key) {
214                 __set_bit(EV_KEY, input->evbit);
215                 __set_bit(rotary->button_key, input->keybit);
216         }
217 
218         /* Quiesce the device before requesting irq */
219         bfin_rotary_close(input);
220 
221         rotary->irq = platform_get_irq(pdev, 0);
222         if (rotary->irq < 0) {
223                 dev_err(dev, "No rotary IRQ specified\n");
224                 return -ENOENT;
225         }
226 
227         error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
228                                  0, dev_name(dev), rotary);
229         if (error) {
230                 dev_err(dev, "unable to claim irq %d; error %d\n",
231                         rotary->irq, error);
232                 return error;
233         }
234 
235         error = input_register_device(input);
236         if (error) {
237                 dev_err(dev, "unable to register input device (%d)\n", error);
238                 return error;
239         }
240 
241         platform_set_drvdata(pdev, rotary);
242         device_init_wakeup(&pdev->dev, 1);
243 
244         return 0;
245 }
246 
247 static int __maybe_unused bfin_rotary_suspend(struct device *dev)
248 {
249         struct platform_device *pdev = to_platform_device(dev);
250         struct bfin_rot *rotary = platform_get_drvdata(pdev);
251 
252         rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF);
253         rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
254         rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
255 
256         if (device_may_wakeup(&pdev->dev))
257                 enable_irq_wake(rotary->irq);
258 
259         return 0;
260 }
261 
262 static int __maybe_unused bfin_rotary_resume(struct device *dev)
263 {
264         struct platform_device *pdev = to_platform_device(dev);
265         struct bfin_rot *rotary = platform_get_drvdata(pdev);
266 
267         writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
268         writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
269         writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
270 
271         if (device_may_wakeup(&pdev->dev))
272                 disable_irq_wake(rotary->irq);
273 
274         if (rotary->cnt_config & CNTE)
275                 writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
276 
277         return 0;
278 }
279 
280 static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
281                          bfin_rotary_suspend, bfin_rotary_resume);
282 
283 static struct platform_driver bfin_rotary_device_driver = {
284         .probe          = bfin_rotary_probe,
285         .driver         = {
286                 .name   = "bfin-rotary",
287                 .pm     = &bfin_rotary_pm_ops,
288         },
289 };
290 module_platform_driver(bfin_rotary_device_driver);
291 
292 MODULE_LICENSE("GPL");
293 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
294 MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
295 MODULE_ALIAS("platform:bfin-rotary");
296 

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