drivers/nvmem/qfprom.c

   1 /*
   2  * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/module.h>
  16 #include <linux/nvmem-provider.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19
  20 static struct regmap_config qfprom_regmap_config = {
  21         .reg_bits = 32,
  22         .val_bits = 8,
  23         .reg_stride = 1,
  24         .val_format_endian = REGMAP_ENDIAN_LITTLE,
  25 };
  26
  27 static struct nvmem_config econfig = {
  28         .name = "qfprom",
  29         .owner = THIS_MODULE,
  30 };
  31
  32 static int qfprom_remove(struct platform_device *pdev)
  33 {
  34         struct nvmem_device *nvmem = platform_get_drvdata(pdev);
  35
  36         return nvmem_unregister(nvmem);
  37 }
  38
  39 static int qfprom_probe(struct platform_device *pdev)
  40 {
  41         struct device *dev = &pdev->dev;
  42         struct resource *res;
  43         struct nvmem_device *nvmem;
  44         struct regmap *regmap;
  45         void __iomem *base;
  46
  47         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  48         base = devm_ioremap_resource(dev, res);
  49         if (IS_ERR(base))
  50                 return PTR_ERR(base);
  51
  52         qfprom_regmap_config.max_register = resource_size(res) - 1;
  53
  54         regmap = devm_regmap_init_mmio(dev, base, &qfprom_regmap_config);
  55         if (IS_ERR(regmap)) {
  56                 dev_err(dev, "regmap init failed\n");
  57                 return PTR_ERR(regmap);
  58         }
  59         econfig.dev = dev;
  60         nvmem = nvmem_register(&econfig);
  61         if (IS_ERR(nvmem))
  62                 return PTR_ERR(nvmem);
  63
  64         platform_set_drvdata(pdev, nvmem);
  65
  66         return 0;
  67 }
  68
  69 static const struct of_device_id qfprom_of_match[] = {
  70         { .compatible = "qcom,qfprom",},
  71         {/* sentinel */},
  72 };
  73 MODULE_DEVICE_TABLE(of, qfprom_of_match);
  74
  75 static struct platform_driver qfprom_driver = {
  76         .probe = qfprom_probe,
  77         .remove = qfprom_remove,
  78         .driver = {
  79                 .name = "qcom,qfprom",
  80                 .of_match_table = qfprom_of_match,
  81         },
  82 };
  83 module_platform_driver(qfprom_driver);
  84 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
  85 MODULE_DESCRIPTION("Qualcomm QFPROM driver");
  86 MODULE_LICENSE("GPL v2");