drivers/regulator/rockchip_io_vol_domain.c

   1
   2
   3 #include <linux/bug.h>
   4 #include <linux/err.h>
   5 #include <linux/i2c.h>
   6 #include <linux/kernel.h>
   7 #include <linux/regulator/driver.h>
   8 #include <linux/delay.h>
   9 #include <linux/slab.h>
  10 #include <linux/mutex.h>
  11 #include <linux/module.h>
  12 #include <linux/of_irq.h>
  13 #include <linux/of_gpio.h>
  14 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16 #include <linux/regulator/of_regulator.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/pinctrl/consumer.h>
  20 #include <linux/regulator/rockchip_io_vol_domain.h>
  21
  22 struct io_domain_port *g_uap;
  23
  24 int io_domain_regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
  25 {
  26         int old_voltage,ret =0;
  27
  28         old_voltage = io_domain_regulator_get_voltage(regulator);
  29         if (IS_ERR(g_uap->pins_3v3) ||IS_ERR(g_uap->pins_1v8) ){
  30                         printk("IO_DOMAIN:ERROR:The io vol domin is not exit. %s\n",__func__);
  31         }
  32
  33         if (min_uV  == old_voltage){
  34                 IO_DOMAIN_DBG("IO_DOMAIN:the vol is not modify,not need to set io vol domain. %s \n",__func__);
  35                 return 0;
  36         }
  37         else if (min_uV  > old_voltage){
  38                 if( min_uV > IO_VOL_DOMAIN_3V3){
  39                         pinctrl_select_state(g_uap->pctl, g_uap->pins_3v3);
  40                         IO_DOMAIN_DBG("IO_DOMAIN:set io domain 3.3v. %s \n",__func__);
  41                 }
  42                 else if (min_uV > IO_VOL_DOMAIN_1V8){
  43                         pinctrl_select_state(g_uap->pctl, g_uap->pins_1v8);
  44                         IO_DOMAIN_DBG("IO_DOMAIN:set io domain 1.8v. %s \n",__func__);
  45                 }
  46                 ret = regulator_set_voltage(regulator,min_uV,max_uV);
  47         }
  48         else if (min_uV  < old_voltage){
  49                 ret = regulator_set_voltage(regulator,min_uV,max_uV);
  50                 if( min_uV > IO_VOL_DOMAIN_3V3){
  51                         pinctrl_select_state(g_uap->pctl, g_uap->pins_3v3);
  52                         IO_DOMAIN_DBG("IO_DOMAIN:set io domain 3.3v. %s \n",__func__);
  53                 }
  54                 else if (min_uV > IO_VOL_DOMAIN_1V8){
  55                         pinctrl_select_state(g_uap->pctl, g_uap->pins_1v8);
  56                         IO_DOMAIN_DBG("IO_DOMAIN:set io domain 1.8v. %s \n",__func__);
  57                 }
  58         }
  59         return ret;
  60
  61 }
  62
  63
  64 #if defined(CONFIG_PM)
  65 static int rk_io_vol_domain_suspend(struct platform_device *pdev, pm_message_t state)
  66 {
  67         return 0;
  68 }
  69
  70 static int rk_io_vol_domain_resume(struct platform_device *pdev)
  71 {
  72         return 0;
  73 }
  74 #else
  75 #define rk_io_vol_domain_suspend NULL
  76 #define rk_io_vol_domain_resume  NULL
  77 #endif
  78
  79 static int rk_io_vol_domain_probe(struct platform_device *pdev)
  80 {
  81         struct io_domain_port *uap;
  82         struct device_node *io_domain_node ;
  83         struct regulator *vol_regulator;
  84         struct io_domain_device *io_vol_dev = NULL;
  85         int vol=0,ret =0;
  86
  87         io_vol_dev = devm_kzalloc(&pdev->dev, sizeof(struct io_domain_device), GFP_KERNEL);
  88         if (!io_vol_dev) {
  89                 dev_err(&pdev->dev, "no memory for state\n");
  90                 return -ENOMEM;
  91         }
  92         platform_set_drvdata(pdev, io_vol_dev);
  93         io_vol_dev->dev = &pdev->dev;
  94
  95         uap = devm_kzalloc(&pdev->dev, sizeof(struct io_domain_port),
  96                            GFP_KERNEL);
  97         if (uap == NULL) {
  98                 printk("uap is not set %s,line=%d\n", __func__,__LINE__);
  99
 100         }
 101         uap->pctl = devm_pinctrl_get(io_vol_dev->dev);
 102         uap->pins_default = pinctrl_lookup_state(uap->pctl,"default");
 103         uap->pins_1v8 = pinctrl_lookup_state(uap->pctl, "1.8V");
 104         uap->pins_3v3 = pinctrl_lookup_state(uap->pctl,"3.3V");
 105         g_uap = uap;
 106
 107         io_domain_node = of_node_get(pdev->dev.of_node);
 108         if (!io_domain_node) {
 109                 printk("could not find rk_io_vol_domain-node\n");
 110                 return -ENODEV ;
 111         }
 112
 113         io_domain_node->name = of_get_property(io_domain_node, "regulator-name", NULL);
 114
 115         if (io_domain_node->name== NULL) {
 116                 printk("%s io_domain_node->name(%s) get regulator_name err, ret:%d\n", __func__, io_domain_node->name,ret);
 117                 return -ENODEV ;
 118         }
 119         vol_regulator = regulator_get(NULL,io_domain_node->name);
 120         if (IS_ERR(vol_regulator)){
 121                 pinctrl_select_state(uap->pctl, uap->pins_default);
 122                 IO_DOMAIN_DBG("IO_DOMAIN:ERROR:The io vol domin regulator name is not exit,set it by defult. %s %s\n",__func__,io_domain_node->name);
 123                 return 0 ;
 124         }
 125         else{
 126                 vol = regulator_get_voltage(vol_regulator);
 127                 if (vol > IO_VOL_DOMAIN_3V3){
 128                         pinctrl_select_state(uap->pctl, uap->pins_3v3);
 129                         IO_DOMAIN_DBG("IO_DOMAIN:set io domain 3.3v. %s %s = %d\n",__func__,io_domain_node->name,vol);
 130                         }
 131                 else if (vol > IO_VOL_DOMAIN_1V8){
 132                         pinctrl_select_state(uap->pctl, uap->pins_1v8);
 133                         IO_DOMAIN_DBG("IO_DOMAIN:set io domain 1.8v. %s %s = %d\n",__func__,io_domain_node->name,vol);
 134                         }
 135                 else{
 136                         pinctrl_select_state(uap->pctl, uap->pins_default);
 137                         IO_DOMAIN_DBG("IO_DOMAIN:ERROR:The io vol domin is not exit,set it by defult. %s %s\n",__func__,io_domain_node->name);
 138                         }
 139         }
 140         regulator_put(vol_regulator);
 141         return 0;
 142 }
 143
 144 static int rk_io_vol_domain_remove(struct platform_device *pdev)
 145 {
 146
 147         return 0;
 148 }
 149
 150 #if defined(CONFIG_OF)
 151 static const struct of_device_id rk_io_vol_domain_dt_ids[] = {
 152         {.compatible = "rockchip,io_vol_domain", .data = NULL, },
 153         {}
 154 };
 155 #endif
 156
 157 static struct platform_driver rk_io_vol_domain_driver = {
 158         .probe = rk_io_vol_domain_probe,
 159         .remove = rk_io_vol_domain_remove,
 160         .driver = {
 161                    .name = "rk_io_vol_domain",
 162                    .owner = THIS_MODULE,
 163                    .of_match_table = of_match_ptr(rk_io_vol_domain_dt_ids),
 164                    },
 165         .suspend = rk_io_vol_domain_suspend,
 166         .resume = rk_io_vol_domain_resume,
 167 };
 168
 169 static int __init rk_io_vol_domain_module_init(void)
 170 {
 171         return platform_driver_register(&rk_io_vol_domain_driver);
 172 }
 173
 174 static void __exit rk_io_vol_domain_module_exit(void)
 175 {
 176         platform_driver_unregister(&rk_io_vol_domain_driver);
 177 }
 178
 179 fs_initcall(rk_io_vol_domain_module_init);
 180 module_exit(rk_io_vol_domain_module_exit);
 181
 182 MODULE_LICENSE("GPL");
 183 MODULE_AUTHOR("rockchip");
 184 MODULE_DESCRIPTION("rk io domain setting");
 185
 186