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ec4664b3 LD |
1 | /* |
2 | * Junction temperature thermal driver for Maxim Max77620. | |
3 | * | |
4 | * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. | |
5 | * | |
6 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
7 | * Mallikarjun Kasoju <mkasoju@nvidia.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms and conditions of the GNU General Public License, | |
11 | * version 2, as published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/irq.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/mfd/max77620.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/regmap.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/thermal.h> | |
23 | ||
24 | #define MAX77620_NORMAL_OPERATING_TEMP 100000 | |
25 | #define MAX77620_TJALARM1_TEMP 120000 | |
26 | #define MAX77620_TJALARM2_TEMP 140000 | |
27 | ||
28 | struct max77620_therm_info { | |
29 | struct device *dev; | |
30 | struct regmap *rmap; | |
31 | struct thermal_zone_device *tz_device; | |
32 | int irq_tjalarm1; | |
33 | int irq_tjalarm2; | |
34 | }; | |
35 | ||
36 | /** | |
37 | * max77620_thermal_read_temp: Read PMIC die temperatue. | |
38 | * @data: Device specific data. | |
39 | * temp: Temperature in millidegrees Celsius | |
40 | * | |
41 | * The actual temperature of PMIC die is not available from PMIC. | |
42 | * PMIC only tells the status if it has crossed or not the threshold level | |
43 | * of 120degC or 140degC. | |
44 | * If threshold has not been crossed then assume die temperature as 100degC | |
45 | * else 120degC or 140deG based on the PMIC die temp threshold status. | |
46 | * | |
47 | * Return 0 on success otherwise error number to show reason of failure. | |
48 | */ | |
49 | ||
50 | static int max77620_thermal_read_temp(void *data, int *temp) | |
51 | { | |
52 | struct max77620_therm_info *mtherm = data; | |
53 | unsigned int val; | |
54 | int ret; | |
55 | ||
56 | ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val); | |
57 | if (ret < 0) { | |
58 | dev_err(mtherm->dev, "Failed to read STATLBT: %d\n", ret); | |
59 | return ret; | |
60 | } | |
61 | ||
62 | if (val & MAX77620_IRQ_TJALRM2_MASK) | |
63 | *temp = MAX77620_TJALARM2_TEMP; | |
64 | else if (val & MAX77620_IRQ_TJALRM1_MASK) | |
65 | *temp = MAX77620_TJALARM1_TEMP; | |
66 | else | |
67 | *temp = MAX77620_NORMAL_OPERATING_TEMP; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static const struct thermal_zone_of_device_ops max77620_thermal_ops = { | |
73 | .get_temp = max77620_thermal_read_temp, | |
74 | }; | |
75 | ||
76 | static irqreturn_t max77620_thermal_irq(int irq, void *data) | |
77 | { | |
78 | struct max77620_therm_info *mtherm = data; | |
79 | ||
80 | if (irq == mtherm->irq_tjalarm1) | |
81 | dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n"); | |
82 | else if (irq == mtherm->irq_tjalarm2) | |
83 | dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n"); | |
84 | ||
0e70f466 SP |
85 | thermal_zone_device_update(mtherm->tz_device, |
86 | THERMAL_EVENT_UNSPECIFIED); | |
ec4664b3 LD |
87 | |
88 | return IRQ_HANDLED; | |
89 | } | |
90 | ||
91 | static int max77620_thermal_probe(struct platform_device *pdev) | |
92 | { | |
93 | struct max77620_therm_info *mtherm; | |
94 | int ret; | |
95 | ||
96 | mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL); | |
97 | if (!mtherm) | |
98 | return -ENOMEM; | |
99 | ||
100 | mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0); | |
101 | mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1); | |
102 | if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) { | |
103 | dev_err(&pdev->dev, "Alarm irq number not available\n"); | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
ec4664b3 LD |
107 | mtherm->dev = &pdev->dev; |
108 | mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL); | |
109 | if (!mtherm->rmap) { | |
110 | dev_err(&pdev->dev, "Failed to get parent regmap\n"); | |
111 | return -ENODEV; | |
112 | } | |
113 | ||
c592fafb | 114 | /* |
ce046e5d JH |
115 | * The reference taken to the parent's node which will be balanced on |
116 | * reprobe or on platform-device release. | |
c592fafb | 117 | */ |
ce046e5d | 118 | device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent); |
c592fafb | 119 | |
ec4664b3 LD |
120 | mtherm->tz_device = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, |
121 | mtherm, &max77620_thermal_ops); | |
122 | if (IS_ERR(mtherm->tz_device)) { | |
123 | ret = PTR_ERR(mtherm->tz_device); | |
124 | dev_err(&pdev->dev, "Failed to register thermal zone: %d\n", | |
125 | ret); | |
126 | return ret; | |
127 | } | |
128 | ||
129 | ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL, | |
130 | max77620_thermal_irq, | |
131 | IRQF_ONESHOT | IRQF_SHARED, | |
132 | dev_name(&pdev->dev), mtherm); | |
133 | if (ret < 0) { | |
134 | dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL, | |
139 | max77620_thermal_irq, | |
140 | IRQF_ONESHOT | IRQF_SHARED, | |
141 | dev_name(&pdev->dev), mtherm); | |
142 | if (ret < 0) { | |
143 | dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret); | |
144 | return ret; | |
145 | } | |
146 | ||
147 | platform_set_drvdata(pdev, mtherm); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static struct platform_device_id max77620_thermal_devtype[] = { | |
153 | { .name = "max77620-thermal", }, | |
154 | {}, | |
155 | }; | |
3f2883e5 | 156 | MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype); |
ec4664b3 LD |
157 | |
158 | static struct platform_driver max77620_thermal_driver = { | |
159 | .driver = { | |
160 | .name = "max77620-thermal", | |
161 | }, | |
162 | .probe = max77620_thermal_probe, | |
163 | .id_table = max77620_thermal_devtype, | |
164 | }; | |
165 | ||
166 | module_platform_driver(max77620_thermal_driver); | |
167 | ||
168 | MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver"); | |
169 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
170 | MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>"); | |
171 | MODULE_LICENSE("GPL v2"); |