drivers/mfd/hi6421-pmic-core.c

   1 /*
   2  * Device driver for Hi6421 IC
   3  *
   4  * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
   5  *              http://www.hisilicon.com
   6  * Copyright (c) <2013-2014> Linaro Ltd.
   7  *              http://www.linaro.org
   8  *
   9  * Author: Guodong Xu <guodong.xu@linaro.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  19  * more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #include <linux/device.h>
  26 #include <linux/err.h>
  27 #include <linux/mfd/core.h>
  28 #include <linux/module.h>
  29 #include <linux/of.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regmap.h>
  32 #include <linux/mfd/hi6421-pmic.h>
  33
  34 static const struct mfd_cell hi6421_devs[] = {
  35         { .name = "hi6421-regulator", },
  36 };
  37
  38 static const struct regmap_config hi6421_regmap_config = {
  39         .reg_bits = 32,
  40         .reg_stride = 4,
  41         .val_bits = 8,
  42         .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
  43 };
  44
  45 static int hi6421_pmic_probe(struct platform_device *pdev)
  46 {
  47         struct hi6421_pmic *pmic;
  48         struct resource *res;
  49         void __iomem *base;
  50         int ret;
  51
  52         pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
  53         if (!pmic)
  54                 return -ENOMEM;
  55
  56         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  57         base = devm_ioremap_resource(&pdev->dev, res);
  58         if (IS_ERR(base))
  59                 return PTR_ERR(base);
  60
  61         pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
  62                                                  &hi6421_regmap_config);
  63         if (IS_ERR(pmic->regmap)) {
  64                 dev_err(&pdev->dev,
  65                         "regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
  66                 return PTR_ERR(pmic->regmap);
  67         }
  68
  69         /* set over-current protection debounce 8ms */
  70         regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
  71                                 (HI6421_OCP_DEB_SEL_MASK
  72                                  | HI6421_OCP_EN_DEBOUNCE_MASK
  73                                  | HI6421_OCP_AUTO_STOP_MASK),
  74                                 (HI6421_OCP_DEB_SEL_8MS
  75                                  | HI6421_OCP_EN_DEBOUNCE_ENABLE));
  76
  77         platform_set_drvdata(pdev, pmic);
  78
  79         ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs,
  80                         ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
  81         if (ret) {
  82                 dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
  83                 return ret;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int hi6421_pmic_remove(struct platform_device *pdev)
  90 {
  91         mfd_remove_devices(&pdev->dev);
  92
  93         return 0;
  94 }
  95
  96 static const struct of_device_id of_hi6421_pmic_match_tbl[] = {
  97         { .compatible = "hisilicon,hi6421-pmic", },
  98         { },
  99 };
 100 MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match_tbl);
 101
 102 static struct platform_driver hi6421_pmic_driver = {
 103         .driver = {
 104                 .name   = "hi6421_pmic",
 105                 .of_match_table = of_hi6421_pmic_match_tbl,
 106         },
 107         .probe  = hi6421_pmic_probe,
 108         .remove = hi6421_pmic_remove,
 109 };
 110 module_platform_driver(hi6421_pmic_driver);
 111
 112 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
 113 MODULE_DESCRIPTION("Hi6421 PMIC driver");
 114 MODULE_LICENSE("GPL v2");