1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Synaptics AS370 SoC Hardware Monitoring Driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2018 Synaptics Incorporated
6*4882a593Smuzhiyun * Author: Jisheng Zhang <jszhang@kernel.org>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/bitops.h>
10*4882a593Smuzhiyun #include <linux/hwmon.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/io.h>
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/of_device.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define CTRL 0x0
17*4882a593Smuzhiyun #define PD BIT(0)
18*4882a593Smuzhiyun #define EN BIT(1)
19*4882a593Smuzhiyun #define T_SEL BIT(2)
20*4882a593Smuzhiyun #define V_SEL BIT(3)
21*4882a593Smuzhiyun #define NMOS_SEL BIT(8)
22*4882a593Smuzhiyun #define PMOS_SEL BIT(9)
23*4882a593Smuzhiyun #define STS 0x4
24*4882a593Smuzhiyun #define BN_MASK GENMASK(11, 0)
25*4882a593Smuzhiyun #define EOC BIT(12)
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun struct as370_hwmon {
28*4882a593Smuzhiyun void __iomem *base;
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
init_pvt(struct as370_hwmon * hwmon)31*4882a593Smuzhiyun static void init_pvt(struct as370_hwmon *hwmon)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun u32 val;
34*4882a593Smuzhiyun void __iomem *addr = hwmon->base + CTRL;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun val = PD;
37*4882a593Smuzhiyun writel_relaxed(val, addr);
38*4882a593Smuzhiyun val |= T_SEL;
39*4882a593Smuzhiyun writel_relaxed(val, addr);
40*4882a593Smuzhiyun val |= EN;
41*4882a593Smuzhiyun writel_relaxed(val, addr);
42*4882a593Smuzhiyun val &= ~PD;
43*4882a593Smuzhiyun writel_relaxed(val, addr);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
as370_hwmon_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * temp)46*4882a593Smuzhiyun static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
47*4882a593Smuzhiyun u32 attr, int channel, long *temp)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun int val;
50*4882a593Smuzhiyun struct as370_hwmon *hwmon = dev_get_drvdata(dev);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun switch (attr) {
53*4882a593Smuzhiyun case hwmon_temp_input:
54*4882a593Smuzhiyun val = readl_relaxed(hwmon->base + STS) & BN_MASK;
55*4882a593Smuzhiyun *temp = DIV_ROUND_CLOSEST(val * 251802, 4096) - 85525;
56*4882a593Smuzhiyun break;
57*4882a593Smuzhiyun default:
58*4882a593Smuzhiyun return -EOPNOTSUPP;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun static umode_t
as370_hwmon_is_visible(const void * data,enum hwmon_sensor_types type,u32 attr,int channel)65*4882a593Smuzhiyun as370_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
66*4882a593Smuzhiyun u32 attr, int channel)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun if (type != hwmon_temp)
69*4882a593Smuzhiyun return 0;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun switch (attr) {
72*4882a593Smuzhiyun case hwmon_temp_input:
73*4882a593Smuzhiyun return 0444;
74*4882a593Smuzhiyun default:
75*4882a593Smuzhiyun return 0;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun static const u32 as370_hwmon_temp_config[] = {
80*4882a593Smuzhiyun HWMON_T_INPUT,
81*4882a593Smuzhiyun 0
82*4882a593Smuzhiyun };
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun static const struct hwmon_channel_info as370_hwmon_temp = {
85*4882a593Smuzhiyun .type = hwmon_temp,
86*4882a593Smuzhiyun .config = as370_hwmon_temp_config,
87*4882a593Smuzhiyun };
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun static const struct hwmon_channel_info *as370_hwmon_info[] = {
90*4882a593Smuzhiyun &as370_hwmon_temp,
91*4882a593Smuzhiyun NULL
92*4882a593Smuzhiyun };
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun static const struct hwmon_ops as370_hwmon_ops = {
95*4882a593Smuzhiyun .is_visible = as370_hwmon_is_visible,
96*4882a593Smuzhiyun .read = as370_hwmon_read,
97*4882a593Smuzhiyun };
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun static const struct hwmon_chip_info as370_chip_info = {
100*4882a593Smuzhiyun .ops = &as370_hwmon_ops,
101*4882a593Smuzhiyun .info = as370_hwmon_info,
102*4882a593Smuzhiyun };
103*4882a593Smuzhiyun
as370_hwmon_probe(struct platform_device * pdev)104*4882a593Smuzhiyun static int as370_hwmon_probe(struct platform_device *pdev)
105*4882a593Smuzhiyun {
106*4882a593Smuzhiyun struct device *hwmon_dev;
107*4882a593Smuzhiyun struct as370_hwmon *hwmon;
108*4882a593Smuzhiyun struct device *dev = &pdev->dev;
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
111*4882a593Smuzhiyun if (!hwmon)
112*4882a593Smuzhiyun return -ENOMEM;
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun hwmon->base = devm_platform_ioremap_resource(pdev, 0);
115*4882a593Smuzhiyun if (IS_ERR(hwmon->base))
116*4882a593Smuzhiyun return PTR_ERR(hwmon->base);
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun init_pvt(hwmon);
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun hwmon_dev = devm_hwmon_device_register_with_info(dev,
121*4882a593Smuzhiyun "as370",
122*4882a593Smuzhiyun hwmon,
123*4882a593Smuzhiyun &as370_chip_info,
124*4882a593Smuzhiyun NULL);
125*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(hwmon_dev);
126*4882a593Smuzhiyun }
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun static const struct of_device_id as370_hwmon_match[] = {
129*4882a593Smuzhiyun { .compatible = "syna,as370-hwmon" },
130*4882a593Smuzhiyun {},
131*4882a593Smuzhiyun };
132*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, as370_hwmon_match);
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun static struct platform_driver as370_hwmon_driver = {
135*4882a593Smuzhiyun .probe = as370_hwmon_probe,
136*4882a593Smuzhiyun .driver = {
137*4882a593Smuzhiyun .name = "as370-hwmon",
138*4882a593Smuzhiyun .of_match_table = as370_hwmon_match,
139*4882a593Smuzhiyun },
140*4882a593Smuzhiyun };
141*4882a593Smuzhiyun module_platform_driver(as370_hwmon_driver);
142*4882a593Smuzhiyun
143*4882a593Smuzhiyun MODULE_AUTHOR("Jisheng Zhang<jszhang@kernel.org>");
144*4882a593Smuzhiyun MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor");
145*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
146