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Linux/drivers/input/misc/sirfsoc-onkey.c

  1 /*
  2  * Power key driver for SiRF PrimaII
  3  *
  4  * Copyright (c) 2013 - 2014 Cambridge Silicon Radio Limited, a CSR plc group
  5  * company.
  6  *
  7  * Licensed under GPLv2 or later.
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/interrupt.h>
 12 #include <linux/delay.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/input.h>
 15 #include <linux/rtc/sirfsoc_rtciobrg.h>
 16 #include <linux/of.h>
 17 #include <linux/workqueue.h>
 18 
 19 struct sirfsoc_pwrc_drvdata {
 20         u32                     pwrc_base;
 21         struct input_dev        *input;
 22         struct delayed_work     work;
 23 };
 24 
 25 #define PWRC_ON_KEY_BIT                 (1 << 0)
 26 
 27 #define PWRC_INT_STATUS                 0xc
 28 #define PWRC_INT_MASK                   0x10
 29 #define PWRC_PIN_STATUS                 0x14
 30 #define PWRC_KEY_DETECT_UP_TIME         20      /* ms*/
 31 
 32 static int sirfsoc_pwrc_is_on_key_down(struct sirfsoc_pwrc_drvdata *pwrcdrv)
 33 {
 34         u32 state = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
 35                                                         PWRC_PIN_STATUS);
 36         return !(state & PWRC_ON_KEY_BIT); /* ON_KEY is active low */
 37 }
 38 
 39 static void sirfsoc_pwrc_report_event(struct work_struct *work)
 40 {
 41         struct sirfsoc_pwrc_drvdata *pwrcdrv =
 42                 container_of(work, struct sirfsoc_pwrc_drvdata, work.work);
 43 
 44         if (sirfsoc_pwrc_is_on_key_down(pwrcdrv)) {
 45                 schedule_delayed_work(&pwrcdrv->work,
 46                         msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME));
 47         } else {
 48                 input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 0);
 49                 input_sync(pwrcdrv->input);
 50         }
 51 }
 52 
 53 static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
 54 {
 55         struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
 56         u32 int_status;
 57 
 58         int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
 59                                                         PWRC_INT_STATUS);
 60         sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
 61                                  pwrcdrv->pwrc_base + PWRC_INT_STATUS);
 62 
 63         input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 1);
 64         input_sync(pwrcdrv->input);
 65         schedule_delayed_work(&pwrcdrv->work,
 66                               msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME));
 67 
 68         return IRQ_HANDLED;
 69 }
 70 
 71 static void sirfsoc_pwrc_toggle_interrupts(struct sirfsoc_pwrc_drvdata *pwrcdrv,
 72                                            bool enable)
 73 {
 74         u32 int_mask;
 75 
 76         int_mask = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK);
 77         if (enable)
 78                 int_mask |= PWRC_ON_KEY_BIT;
 79         else
 80                 int_mask &= ~PWRC_ON_KEY_BIT;
 81         sirfsoc_rtc_iobrg_writel(int_mask, pwrcdrv->pwrc_base + PWRC_INT_MASK);
 82 }
 83 
 84 static int sirfsoc_pwrc_open(struct input_dev *input)
 85 {
 86         struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
 87 
 88         sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
 89 
 90         return 0;
 91 }
 92 
 93 static void sirfsoc_pwrc_close(struct input_dev *input)
 94 {
 95         struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
 96 
 97         sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
 98         cancel_delayed_work_sync(&pwrcdrv->work);
 99 }
100 
101 static const struct of_device_id sirfsoc_pwrc_of_match[] = {
102         { .compatible = "sirf,prima2-pwrc" },
103         {},
104 }
105 MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
106 
107 static int sirfsoc_pwrc_probe(struct platform_device *pdev)
108 {
109         struct device_node *np = pdev->dev.of_node;
110         struct sirfsoc_pwrc_drvdata *pwrcdrv;
111         int irq;
112         int error;
113 
114         pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
115                                GFP_KERNEL);
116         if (!pwrcdrv) {
117                 dev_info(&pdev->dev, "Not enough memory for the device data\n");
118                 return -ENOMEM;
119         }
120 
121         /*
122          * We can't use of_iomap because pwrc is not mapped in memory,
123          * the so-called base address is only offset in rtciobrg
124          */
125         error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
126         if (error) {
127                 dev_err(&pdev->dev,
128                         "unable to find base address of pwrc node in dtb\n");
129                 return error;
130         }
131 
132         pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
133         if (!pwrcdrv->input)
134                 return -ENOMEM;
135 
136         pwrcdrv->input->name = "sirfsoc pwrckey";
137         pwrcdrv->input->phys = "pwrc/input0";
138         pwrcdrv->input->evbit[0] = BIT_MASK(EV_KEY);
139         input_set_capability(pwrcdrv->input, EV_KEY, KEY_POWER);
140 
141         INIT_DELAYED_WORK(&pwrcdrv->work, sirfsoc_pwrc_report_event);
142 
143         pwrcdrv->input->open = sirfsoc_pwrc_open;
144         pwrcdrv->input->close = sirfsoc_pwrc_close;
145 
146         input_set_drvdata(pwrcdrv->input, pwrcdrv);
147 
148         /* Make sure the device is quiesced */
149         sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
150 
151         irq = platform_get_irq(pdev, 0);
152         error = devm_request_irq(&pdev->dev, irq,
153                                  sirfsoc_pwrc_isr, 0,
154                                  "sirfsoc_pwrc_int", pwrcdrv);
155         if (error) {
156                 dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
157                         irq, error);
158                 return error;
159         }
160 
161         error = input_register_device(pwrcdrv->input);
162         if (error) {
163                 dev_err(&pdev->dev,
164                         "unable to register input device, error: %d\n",
165                         error);
166                 return error;
167         }
168 
169         dev_set_drvdata(&pdev->dev, pwrcdrv);
170         device_init_wakeup(&pdev->dev, 1);
171 
172         return 0;
173 }
174 
175 static int sirfsoc_pwrc_remove(struct platform_device *pdev)
176 {
177         device_init_wakeup(&pdev->dev, 0);
178 
179         return 0;
180 }
181 
182 #ifdef CONFIG_PM_SLEEP
183 static int sirfsoc_pwrc_resume(struct device *dev)
184 {
185         struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_get_drvdata(dev);
186         struct input_dev *input = pwrcdrv->input;
187 
188         /*
189          * Do not mask pwrc interrupt as we want pwrc work as a wakeup source
190          * if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
191          */
192         mutex_lock(&input->mutex);
193         if (input->users)
194                 sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
195         mutex_unlock(&input->mutex);
196 
197         return 0;
198 }
199 #endif
200 
201 static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, sirfsoc_pwrc_resume);
202 
203 static struct platform_driver sirfsoc_pwrc_driver = {
204         .probe          = sirfsoc_pwrc_probe,
205         .remove         = sirfsoc_pwrc_remove,
206         .driver         = {
207                 .name   = "sirfsoc-pwrc",
208                 .owner  = THIS_MODULE,
209                 .pm     = &sirfsoc_pwrc_pm_ops,
210                 .of_match_table = sirfsoc_pwrc_of_match,
211         }
212 };
213 
214 module_platform_driver(sirfsoc_pwrc_driver);
215 
216 MODULE_LICENSE("GPL v2");
217 MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
218 MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
219 MODULE_ALIAS("platform:sirfsoc-pwrc");
220 

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