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"); 87