GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / thermal / max77620_thermal.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Junction temperature thermal driver for Maxim Max77620.
4  *
5  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
6  *
7  * Author: Laxman Dewangan <ldewangan@nvidia.com>
8  *         Mallikarjun Kasoju <mkasoju@nvidia.com>
9  */
10
11 #include <linux/irq.h>
12 #include <linux/interrupt.h>
13 #include <linux/mfd/max77620.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/slab.h>
19 #include <linux/thermal.h>
20
21 #define MAX77620_NORMAL_OPERATING_TEMP  100000
22 #define MAX77620_TJALARM1_TEMP          120000
23 #define MAX77620_TJALARM2_TEMP          140000
24
25 struct max77620_therm_info {
26         struct device                   *dev;
27         struct regmap                   *rmap;
28         struct thermal_zone_device      *tz_device;
29         int                             irq_tjalarm1;
30         int                             irq_tjalarm2;
31 };
32
33 /**
34  * max77620_thermal_read_temp: Read PMIC die temperatue.
35  * @data:       Device specific data.
36  * @temp:       Temperature in millidegrees Celsius
37  *
38  * The actual temperature of PMIC die is not available from PMIC.
39  * PMIC only tells the status if it has crossed or not the threshold level
40  * of 120degC or 140degC.
41  * If threshold has not been crossed then assume die temperature as 100degC
42  * else 120degC or 140deG based on the PMIC die temp threshold status.
43  *
44  * Return 0 on success otherwise error number to show reason of failure.
45  */
46
47 static int max77620_thermal_read_temp(void *data, int *temp)
48 {
49         struct max77620_therm_info *mtherm = data;
50         unsigned int val;
51         int ret;
52
53         ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);
54         if (ret < 0) {
55                 dev_err(mtherm->dev, "Failed to read STATLBT: %d\n", ret);
56                 return ret;
57         }
58
59         if (val & MAX77620_IRQ_TJALRM2_MASK)
60                 *temp = MAX77620_TJALARM2_TEMP;
61         else if (val & MAX77620_IRQ_TJALRM1_MASK)
62                 *temp = MAX77620_TJALARM1_TEMP;
63         else
64                 *temp = MAX77620_NORMAL_OPERATING_TEMP;
65
66         return 0;
67 }
68
69 static const struct thermal_zone_of_device_ops max77620_thermal_ops = {
70         .get_temp = max77620_thermal_read_temp,
71 };
72
73 static irqreturn_t max77620_thermal_irq(int irq, void *data)
74 {
75         struct max77620_therm_info *mtherm = data;
76
77         if (irq == mtherm->irq_tjalarm1)
78                 dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");
79         else if (irq == mtherm->irq_tjalarm2)
80                 dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");
81
82         thermal_zone_device_update(mtherm->tz_device,
83                                    THERMAL_EVENT_UNSPECIFIED);
84
85         return IRQ_HANDLED;
86 }
87
88 static int max77620_thermal_probe(struct platform_device *pdev)
89 {
90         struct max77620_therm_info *mtherm;
91         int ret;
92
93         mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);
94         if (!mtherm)
95                 return -ENOMEM;
96
97         mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);
98         mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);
99         if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) {
100                 dev_err(&pdev->dev, "Alarm irq number not available\n");
101                 return -EINVAL;
102         }
103
104         mtherm->dev = &pdev->dev;
105         mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);
106         if (!mtherm->rmap) {
107                 dev_err(&pdev->dev, "Failed to get parent regmap\n");
108                 return -ENODEV;
109         }
110
111         /*
112          * The reference taken to the parent's node which will be balanced on
113          * reprobe or on platform-device release.
114          */
115         device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
116
117         mtherm->tz_device = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
118                                 mtherm, &max77620_thermal_ops);
119         if (IS_ERR(mtherm->tz_device)) {
120                 ret = PTR_ERR(mtherm->tz_device);
121                 dev_err(&pdev->dev, "Failed to register thermal zone: %d\n",
122                         ret);
123                 return ret;
124         }
125
126         ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,
127                                         max77620_thermal_irq,
128                                         IRQF_ONESHOT | IRQF_SHARED,
129                                         dev_name(&pdev->dev), mtherm);
130         if (ret < 0) {
131                 dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret);
132                 return ret;
133         }
134
135         ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,
136                                         max77620_thermal_irq,
137                                         IRQF_ONESHOT | IRQF_SHARED,
138                                         dev_name(&pdev->dev), mtherm);
139         if (ret < 0) {
140                 dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret);
141                 return ret;
142         }
143
144         platform_set_drvdata(pdev, mtherm);
145
146         return 0;
147 }
148
149 static struct platform_device_id max77620_thermal_devtype[] = {
150         { .name = "max77620-thermal", },
151         {},
152 };
153 MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype);
154
155 static struct platform_driver max77620_thermal_driver = {
156         .driver = {
157                 .name = "max77620-thermal",
158         },
159         .probe = max77620_thermal_probe,
160         .id_table = max77620_thermal_devtype,
161 };
162
163 module_platform_driver(max77620_thermal_driver);
164
165 MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");
166 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
167 MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
168 MODULE_LICENSE("GPL v2");