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75a6faf6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ec4664b3 LD |
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> | |
ec4664b3 LD |
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. | |
0f43e646 | 36 | * @temp: Temperature in millidegrees Celsius |
ec4664b3 LD |
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 | ||
0e70f466 SP |
82 | thermal_zone_device_update(mtherm->tz_device, |
83 | THERMAL_EVENT_UNSPECIFIED); | |
ec4664b3 LD |
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 | ||
ec4664b3 LD |
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 | ||
c592fafb | 111 | /* |
ce046e5d JH |
112 | * The reference taken to the parent's node which will be balanced on |
113 | * reprobe or on platform-device release. | |
c592fafb | 114 | */ |
ce046e5d | 115 | device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent); |
c592fafb | 116 | |
ec4664b3 LD |
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 | }; | |
3f2883e5 | 153 | MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype); |
ec4664b3 LD |
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"); |