]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/nvmem/qfprom.c
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.git] / 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/io.h>
17 #include <linux/nvmem-provider.h>
18 #include <linux/platform_device.h>
19
20 struct qfprom_priv {
21 void __iomem *base;
22 };
23
24 static int qfprom_reg_read(void *context,
25 unsigned int reg, void *_val, size_t bytes)
26 {
27 struct qfprom_priv *priv = context;
28 u8 *val = _val;
29 int i = 0, words = bytes;
30
31 while (words--)
32 *val++ = readb(priv->base + reg + i++);
33
34 return 0;
35 }
36
37 static int qfprom_reg_write(void *context,
38 unsigned int reg, void *_val, size_t bytes)
39 {
40 struct qfprom_priv *priv = context;
41 u8 *val = _val;
42 int i = 0, words = bytes;
43
44 while (words--)
45 writeb(*val++, priv->base + reg + i++);
46
47 return 0;
48 }
49
50 static int qfprom_remove(struct platform_device *pdev)
51 {
52 struct nvmem_device *nvmem = platform_get_drvdata(pdev);
53
54 return nvmem_unregister(nvmem);
55 }
56
57 static struct nvmem_config econfig = {
58 .name = "qfprom",
59 .stride = 1,
60 .word_size = 1,
61 .reg_read = qfprom_reg_read,
62 .reg_write = qfprom_reg_write,
63 };
64
65 static int qfprom_probe(struct platform_device *pdev)
66 {
67 struct device *dev = &pdev->dev;
68 struct resource *res;
69 struct nvmem_device *nvmem;
70 struct qfprom_priv *priv;
71
72 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
73 if (!priv)
74 return -ENOMEM;
75
76 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
77 priv->base = devm_ioremap_resource(dev, res);
78 if (IS_ERR(priv->base))
79 return PTR_ERR(priv->base);
80
81 econfig.size = resource_size(res);
82 econfig.dev = dev;
83 econfig.priv = priv;
84
85 nvmem = nvmem_register(&econfig);
86 if (IS_ERR(nvmem))
87 return PTR_ERR(nvmem);
88
89 platform_set_drvdata(pdev, nvmem);
90
91 return 0;
92 }
93
94 static const struct of_device_id qfprom_of_match[] = {
95 { .compatible = "qcom,qfprom",},
96 {/* sentinel */},
97 };
98 MODULE_DEVICE_TABLE(of, qfprom_of_match);
99
100 static struct platform_driver qfprom_driver = {
101 .probe = qfprom_probe,
102 .remove = qfprom_remove,
103 .driver = {
104 .name = "qcom,qfprom",
105 .of_match_table = qfprom_of_match,
106 },
107 };
108 module_platform_driver(qfprom_driver);
109 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
110 MODULE_DESCRIPTION("Qualcomm QFPROM driver");
111 MODULE_LICENSE("GPL v2");