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 }; 25 26 static struct nvmem_config econfig = { 27 .name = "qfprom", 28 .owner = THIS_MODULE, 29 }; 30 31 static int qfprom_remove(struct platform_device *pdev) 32 { 33 struct nvmem_device *nvmem = platform_get_drvdata(pdev); 34 35 return nvmem_unregister(nvmem); 36 } 37 38 static int qfprom_probe(struct platform_device *pdev) 39 { 40 struct device *dev = &pdev->dev; 41 struct resource *res; 42 struct nvmem_device *nvmem; 43 struct regmap *regmap; 44 void __iomem *base; 45 46 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 47 base = devm_ioremap_resource(dev, res); 48 if (IS_ERR(base)) 49 return PTR_ERR(base); 50 51 qfprom_regmap_config.max_register = resource_size(res) - 1; 52 53 regmap = devm_regmap_init_mmio(dev, base, &qfprom_regmap_config); 54 if (IS_ERR(regmap)) { 55 dev_err(dev, "regmap init failed\n"); 56 return PTR_ERR(regmap); 57 } 58 econfig.dev = dev; 59 nvmem = nvmem_register(&econfig); 60 if (IS_ERR(nvmem)) 61 return PTR_ERR(nvmem); 62 63 platform_set_drvdata(pdev, nvmem); 64 65 return 0; 66 } 67 68 static const struct of_device_id qfprom_of_match[] = { 69 { .compatible = "qcom,qfprom",}, 70 {/* sentinel */}, 71 }; 72 MODULE_DEVICE_TABLE(of, qfprom_of_match); 73 74 static struct platform_driver qfprom_driver = { 75 .probe = qfprom_probe, 76 .remove = qfprom_remove, 77 .driver = { 78 .name = "qcom,qfprom", 79 .of_match_table = qfprom_of_match, 80 }, 81 }; 82 module_platform_driver(qfprom_driver); 83 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); 84 MODULE_DESCRIPTION("Qualcomm QFPROM driver"); 85 MODULE_LICENSE("GPL v2"); 86