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

  1 /*
  2  * Power key driver for SiRF PrimaII
  3  *
  4  * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.
  5  *
  6  * Licensed under GPLv2 or later.
  7  */
  8 
  9 #include <linux/module.h>
 10 #include <linux/interrupt.h>
 11 #include <linux/delay.h>
 12 #include <linux/platform_device.h>
 13 #include <linux/input.h>
 14 #include <linux/rtc/sirfsoc_rtciobrg.h>
 15 #include <linux/of.h>
 16 
 17 struct sirfsoc_pwrc_drvdata {
 18         u32                     pwrc_base;
 19         struct input_dev        *input;
 20 };
 21 
 22 #define PWRC_ON_KEY_BIT                 (1 << 0)
 23 
 24 #define PWRC_INT_STATUS                 0xc
 25 #define PWRC_INT_MASK                   0x10
 26 
 27 static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
 28 {
 29         struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
 30         u32 int_status;
 31 
 32         int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
 33                                                         PWRC_INT_STATUS);
 34         sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
 35                                  pwrcdrv->pwrc_base + PWRC_INT_STATUS);
 36 
 37         /*
 38          * For a typical Linux system, we report KEY_SUSPEND to trigger apm-power.c
 39          * to queue a SUSPEND APM event
 40          */
 41         input_event(pwrcdrv->input, EV_PWR, KEY_SUSPEND, 1);
 42         input_sync(pwrcdrv->input);
 43 
 44         /*
 45          * Todo: report KEY_POWER event for Android platforms, Android PowerManager
 46          * will handle the suspend and powerdown/hibernation
 47          */
 48 
 49         return IRQ_HANDLED;
 50 }
 51 
 52 static const struct of_device_id sirfsoc_pwrc_of_match[] = {
 53         { .compatible = "sirf,prima2-pwrc" },
 54         {},
 55 }
 56 MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
 57 
 58 static int sirfsoc_pwrc_probe(struct platform_device *pdev)
 59 {
 60         struct device_node *np = pdev->dev.of_node;
 61         struct sirfsoc_pwrc_drvdata *pwrcdrv;
 62         int irq;
 63         int error;
 64 
 65         pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
 66                                GFP_KERNEL);
 67         if (!pwrcdrv) {
 68                 dev_info(&pdev->dev, "Not enough memory for the device data\n");
 69                 return -ENOMEM;
 70         }
 71 
 72         /*
 73          * we can't use of_iomap because pwrc is not mapped in memory,
 74          * the so-called base address is only offset in rtciobrg
 75          */
 76         error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
 77         if (error) {
 78                 dev_err(&pdev->dev,
 79                         "unable to find base address of pwrc node in dtb\n");
 80                 return error;
 81         }
 82 
 83         pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
 84         if (!pwrcdrv->input)
 85                 return -ENOMEM;
 86 
 87         pwrcdrv->input->name = "sirfsoc pwrckey";
 88         pwrcdrv->input->phys = "pwrc/input0";
 89         pwrcdrv->input->evbit[0] = BIT_MASK(EV_PWR);
 90 
 91         irq = platform_get_irq(pdev, 0);
 92         error = devm_request_irq(&pdev->dev, irq,
 93                                  sirfsoc_pwrc_isr, IRQF_SHARED,
 94                                  "sirfsoc_pwrc_int", pwrcdrv);
 95         if (error) {
 96                 dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
 97                         irq, error);
 98                 return error;
 99         }
100 
101         sirfsoc_rtc_iobrg_writel(
102                 sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK) |
103                         PWRC_ON_KEY_BIT,
104                 pwrcdrv->pwrc_base + PWRC_INT_MASK);
105 
106         error = input_register_device(pwrcdrv->input);
107         if (error) {
108                 dev_err(&pdev->dev,
109                         "unable to register input device, error: %d\n",
110                         error);
111                 return error;
112         }
113 
114         platform_set_drvdata(pdev, pwrcdrv);
115         device_init_wakeup(&pdev->dev, 1);
116 
117         return 0;
118 }
119 
120 static int sirfsoc_pwrc_remove(struct platform_device *pdev)
121 {
122         device_init_wakeup(&pdev->dev, 0);
123 
124         return 0;
125 }
126 
127 #ifdef CONFIG_PM_SLEEP
128 static int pwrc_resume(struct device *dev)
129 {
130         struct platform_device *pdev = to_platform_device(dev);
131         struct sirfsoc_pwrc_drvdata *pwrcdrv = platform_get_drvdata(pdev);
132 
133         /*
134          * Do not mask pwrc interrupt as we want pwrc work as a wakeup source
135          * if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
136          */
137         sirfsoc_rtc_iobrg_writel(
138                 sirfsoc_rtc_iobrg_readl(
139                 pwrcdrv->pwrc_base + PWRC_INT_MASK) | PWRC_ON_KEY_BIT,
140                 pwrcdrv->pwrc_base + PWRC_INT_MASK);
141 
142         return 0;
143 }
144 #endif
145 
146 static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, pwrc_resume);
147 
148 static struct platform_driver sirfsoc_pwrc_driver = {
149         .probe          = sirfsoc_pwrc_probe,
150         .remove         = sirfsoc_pwrc_remove,
151         .driver         = {
152                 .name   = "sirfsoc-pwrc",
153                 .owner  = THIS_MODULE,
154                 .pm     = &sirfsoc_pwrc_pm_ops,
155                 .of_match_table = sirfsoc_pwrc_of_match,
156         }
157 };
158 
159 module_platform_driver(sirfsoc_pwrc_driver);
160 
161 MODULE_LICENSE("GPLv2");
162 MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
163 MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
164 MODULE_ALIAS("platform:sirfsoc-pwrc");
165 

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