drivers/mfd/rt5036-irq.c

   1 /*
   2  *  drivers/mfd/rt5036-irq.c
   3  *  Driver for Richtek RT5036 PMIC IRQ driver
   4  *
   5  *  Copyright (C) 2014 Richtek Technology Corp.
   6  *  cy_huang <cy_huang@richtek.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/i2c.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <linux/mfd/rt5036/rt5036.h>
  25 #include <linux/mfd/rt5036/rt5036-irq.h>
  26
  27 struct rt5036_irq_info {
  28         struct i2c_client *i2c;
  29         struct rt5036_chip *chip;
  30         struct device *dev;
  31         int irq;
  32         unsigned char suspend:1;
  33         struct delayed_work irq_delayed_work;
  34 };
  35
  36 static irqreturn_t rt5036_irq_handler(int irqno, void *param)
  37 {
  38         struct rt5036_irq_info *ii = param;
  39         unsigned char regval[3];
  40         unsigned int irq_event;
  41         int ret = 0;
  42
  43         if (ii->suspend) {
  44                 schedule_delayed_work(&ii->irq_delayed_work,
  45                                       msecs_to_jiffies(10));
  46                 goto irq_fin;
  47         }
  48
  49         ret =
  50             rt5036_reg_block_read(ii->i2c, RT5036_REG_CHGIRQ1,
  51                                   ARRAY_SIZE(regval), regval);
  52         if (ret < 0) {
  53                 dev_err(ii->dev, "read charger irq event fail\n");
  54         } else {
  55                 irq_event = regval[0] << 16 | regval[1] << 8 | regval[2];
  56                 RTINFO("chg event %06x\n", irq_event);
  57 #ifdef CONFIG_CHARGER_RT5036
  58                 if (irq_event && ii->chip->chg_info)
  59                         rt5036_charger_irq_handler(ii->chip->chg_info,
  60                                                    irq_event);
  61 #endif /* #ifdef CONFIG_CHARGER_RT5036 */
  62         }
  63
  64         ret =
  65             rt5036_reg_block_read(ii->i2c, RT5036_REG_BUCKLDOIRQ,
  66                                   ARRAY_SIZE(regval), regval);
  67         if (ret < 0) {
  68                 dev_err(ii->dev, "read misc irq event fail\n");
  69         } else {
  70                 irq_event = regval[0] << 16 | regval[1] << 8 | regval[2];
  71                 RTINFO("misc event %06x\n", irq_event);
  72 #ifdef CONFIG_MISC_RT5036
  73                 if (irq_event && ii->chip->misc_info)
  74                         rt5036_misc_irq_handler(ii->chip->misc_info, irq_event);
  75 #endif /* #ifdef CONFIG_MISC_RT5036 */
  76         }
  77
  78         ret = rt5036_reg_read(ii->i2c, RT5036_REG_STBWACKIRQ);
  79         if (ret < 0) {
  80                 dev_err(ii->dev, "read rtc irq event fail\n");
  81         } else {
  82                 irq_event = ret;
  83                 RTINFO("rtc event %02x\n", irq_event);
  84 #ifdef CONFIG_RTC_RT5036
  85                 if (irq_event && ii->chip->rtc_info)
  86                         rt5036_rtc_irq_handler(ii->chip->rtc_info, irq_event);
  87 #endif /* #ifdef CONFIG_RTC_RT5036 */
  88         }
  89         rt5036_set_bits(ii->i2c, RT5036_REG_BUCKVN1, RT5036_IRQPREZ_MASK);
  90 irq_fin:
  91         return IRQ_HANDLED;
  92 }
  93
  94 static void rt5036_irq_delayed_work(struct work_struct *work)
  95 {
  96         struct rt5036_irq_info *ii =
  97             (struct rt5036_irq_info *)container_of(work, struct rt5036_irq_info,
  98                                                    irq_delayed_work.work);
  99         rt5036_irq_handler(ii->irq, ii);
 100 }
 101
 102 static int rt_parse_dt(struct rt5036_irq_info *ii, struct device *dev)
 103 {
 104 #ifdef CONFIG_OF
 105         struct device_node *np = dev->of_node;
 106         int val;
 107
 108         val = of_get_named_gpio(np, "rt,irq-gpio", 0);
 109         if (gpio_is_valid(val)) {
 110                 if (gpio_request(val, "rt5036_irq") >= 0) {
 111                         gpio_direction_input(val);
 112                         ii->irq = gpio_to_irq(val);
 113                 } else {
 114                         ii->irq = -1;
 115                 }
 116         } else {
 117                 ii->irq = -1;
 118         }
 119 #endif /* #ifdef CONFIG_OF */
 120         RTINFO("\n");
 121         return 0;
 122 }
 123
 124 static int rt_parse_pdata(struct rt5036_irq_info *ii,
 125                                     struct device *dev)
 126 {
 127         struct rt5036_irq_data *pdata = dev->platform_data;
 128
 129         if (gpio_is_valid(pdata->irq_gpio)) {
 130                 if (gpio_request(pdata->irq_gpio, "rt5036_irq") >= 0) {
 131                         gpio_direction_input(pdata->irq_gpio);
 132                         ii->irq = gpio_to_irq(pdata->irq_gpio);
 133                 } else {
 134                         ii->irq = -1;
 135                 }
 136         } else {
 137                 ii->irq = -1;
 138         }
 139         RTINFO("\n");
 140         return 0;
 141 }
 142
 143 static int rt5036_irq_probe(struct platform_device *pdev)
 144 {
 145         struct rt5036_chip *chip = dev_get_drvdata(pdev->dev.parent);
 146         struct rt5036_platform_data *pdata = (pdev->dev.parent)->platform_data;
 147         struct rt5036_irq_info *ii;
 148         bool use_dt = pdev->dev.of_node;
 149
 150         ii = devm_kzalloc(&pdev->dev, sizeof(*ii), GFP_KERNEL);
 151         if (!ii)
 152                 return -ENOMEM;
 153
 154         ii->i2c = chip->i2c;
 155         ii->chip = chip;
 156         ii->dev = &pdev->dev;
 157         if (use_dt) {
 158                 rt_parse_dt(ii, &pdev->dev);
 159         } else {
 160                 if (!pdata)
 161                         goto out_dev;
 162                 pdev->dev.platform_data = pdata->irq_pdata;
 163                 rt_parse_pdata(ii, &pdev->dev);
 164                 dev_info(&pdev->dev, "ii->irq %d\n", ii->irq);
 165         }
 166         INIT_DELAYED_WORK(&ii->irq_delayed_work, rt5036_irq_delayed_work);
 167
 168         platform_set_drvdata(pdev, ii);
 169         if (ii->irq >= 0) {
 170                 if (devm_request_threaded_irq
 171                     (&pdev->dev, ii->irq, NULL,rt5036_irq_handler,
 172                      IRQF_TRIGGER_FALLING | IRQF_NO_SUSPEND | IRQF_ONESHOT,
 173                      "rt5036_irq", ii)) {
 174                         dev_err(&pdev->dev, "request threaded irq fail\n");
 175                         goto out_dev;
 176                 }
 177                 enable_irq_wake(ii->irq);
 178                 schedule_delayed_work(&ii->irq_delayed_work,
 179                                       msecs_to_jiffies(500));
 180         }
 181         dev_info(&pdev->dev, "driver successfully loaded\n");
 182         return 0;
 183 out_dev:
 184         return -EINVAL;
 185 }
 186
 187 static int rt5036_irq_remove(struct platform_device *pdev)
 188 {
 189         struct rt5036_irq_info *ii = platform_get_drvdata(pdev);
 190
 191         if (ii->irq >= 0)
 192                 devm_free_irq(&pdev->dev, ii->irq, ii);
 193         return 0;
 194 }
 195
 196 static int rt5036_irq_suspend(struct platform_device *pdev, pm_message_t state)
 197 {
 198         struct rt5036_irq_info *ii = platform_get_drvdata(pdev);
 199
 200         ii->suspend = 1;
 201         return 0;
 202 }
 203
 204 static int rt5036_irq_resume(struct platform_device *pdev)
 205 {
 206         struct rt5036_irq_info *ii = platform_get_drvdata(pdev);
 207
 208         ii->suspend = 0;
 209         return 0;
 210 }
 211
 212 static const struct of_device_id rt_match_table[] = {
 213         {.compatible = "rt,rt5036-irq",},
 214         {},
 215 };
 216
 217 static struct platform_driver rt5036_irq_driver = {
 218         .driver = {
 219                    .name = RT5036_DEV_NAME "-irq",
 220                    .owner = THIS_MODULE,
 221                    .of_match_table = rt_match_table,
 222                    },
 223         .probe = rt5036_irq_probe,
 224         .remove = rt5036_irq_remove,
 225         .suspend = rt5036_irq_suspend,
 226         .resume = rt5036_irq_resume,
 227 };
 228
 229 static int __init rt5036_irq_init(void)
 230 {
 231         return platform_driver_register(&rt5036_irq_driver);
 232 }
 233 subsys_initcall_sync(rt5036_irq_init);
 234
 235 static void __exit rt5036_irq_exit(void)
 236 {
 237         platform_driver_unregister(&rt5036_irq_driver);
 238 }
 239 module_exit(rt5036_irq_exit);
 240
 241 MODULE_LICENSE("GPL");
 242 MODULE_AUTHOR("CY Huang <cy_huang@richtek.com");
 243 MODULE_DESCRIPTION("IRQ driver for RT5036");
 244 MODULE_ALIAS("platform:" RT5036_DEV_NAME "-irq");
 245 MODULE_VERSION(RT5036_DRV_VER);