]>
Commit | Line | Data |
---|---|---|
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 | ||
ae11d6a8 | 47 | static int max77620_thermal_read_temp(struct thermal_zone_device *tz, int *temp) |
ec4664b3 | 48 | { |
5f68d078 | 49 | struct max77620_therm_info *mtherm = thermal_zone_device_priv(tz); |
ec4664b3 LD |
50 | unsigned int val; |
51 | int ret; | |
52 | ||
53 | ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val); | |
abda7383 | 54 | if (ret < 0) |
ec4664b3 | 55 | return ret; |
ec4664b3 LD |
56 | |
57 | if (val & MAX77620_IRQ_TJALRM2_MASK) | |
58 | *temp = MAX77620_TJALARM2_TEMP; | |
59 | else if (val & MAX77620_IRQ_TJALRM1_MASK) | |
60 | *temp = MAX77620_TJALARM1_TEMP; | |
61 | else | |
62 | *temp = MAX77620_NORMAL_OPERATING_TEMP; | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
ae11d6a8 | 67 | static const struct thermal_zone_device_ops max77620_thermal_ops = { |
ec4664b3 LD |
68 | .get_temp = max77620_thermal_read_temp, |
69 | }; | |
70 | ||
71 | static irqreturn_t max77620_thermal_irq(int irq, void *data) | |
72 | { | |
73 | struct max77620_therm_info *mtherm = data; | |
74 | ||
75 | if (irq == mtherm->irq_tjalarm1) | |
76 | dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n"); | |
77 | else if (irq == mtherm->irq_tjalarm2) | |
78 | dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n"); | |
79 | ||
0e70f466 SP |
80 | thermal_zone_device_update(mtherm->tz_device, |
81 | THERMAL_EVENT_UNSPECIFIED); | |
ec4664b3 LD |
82 | |
83 | return IRQ_HANDLED; | |
84 | } | |
85 | ||
86 | static int max77620_thermal_probe(struct platform_device *pdev) | |
87 | { | |
88 | struct max77620_therm_info *mtherm; | |
89 | int ret; | |
90 | ||
91 | mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL); | |
92 | if (!mtherm) | |
93 | return -ENOMEM; | |
94 | ||
95 | mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0); | |
96 | mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1); | |
97 | if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) { | |
98 | dev_err(&pdev->dev, "Alarm irq number not available\n"); | |
99 | return -EINVAL; | |
100 | } | |
101 | ||
ec4664b3 LD |
102 | mtherm->dev = &pdev->dev; |
103 | mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL); | |
104 | if (!mtherm->rmap) { | |
105 | dev_err(&pdev->dev, "Failed to get parent regmap\n"); | |
106 | return -ENODEV; | |
107 | } | |
108 | ||
c592fafb | 109 | /* |
ce046e5d JH |
110 | * The reference taken to the parent's node which will be balanced on |
111 | * reprobe or on platform-device release. | |
c592fafb | 112 | */ |
ce046e5d | 113 | device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent); |
c592fafb | 114 | |
ae11d6a8 | 115 | mtherm->tz_device = devm_thermal_of_zone_register(&pdev->dev, 0, |
ec4664b3 LD |
116 | mtherm, &max77620_thermal_ops); |
117 | if (IS_ERR(mtherm->tz_device)) { | |
118 | ret = PTR_ERR(mtherm->tz_device); | |
119 | dev_err(&pdev->dev, "Failed to register thermal zone: %d\n", | |
120 | ret); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL, | |
125 | max77620_thermal_irq, | |
126 | IRQF_ONESHOT | IRQF_SHARED, | |
127 | dev_name(&pdev->dev), mtherm); | |
128 | if (ret < 0) { | |
129 | dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret); | |
130 | return ret; | |
131 | } | |
132 | ||
133 | ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL, | |
134 | max77620_thermal_irq, | |
135 | IRQF_ONESHOT | IRQF_SHARED, | |
136 | dev_name(&pdev->dev), mtherm); | |
137 | if (ret < 0) { | |
138 | dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | platform_set_drvdata(pdev, mtherm); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static struct platform_device_id max77620_thermal_devtype[] = { | |
148 | { .name = "max77620-thermal", }, | |
149 | {}, | |
150 | }; | |
3f2883e5 | 151 | MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype); |
ec4664b3 LD |
152 | |
153 | static struct platform_driver max77620_thermal_driver = { | |
154 | .driver = { | |
155 | .name = "max77620-thermal", | |
156 | }, | |
157 | .probe = max77620_thermal_probe, | |
158 | .id_table = max77620_thermal_devtype, | |
159 | }; | |
160 | ||
161 | module_platform_driver(max77620_thermal_driver); | |
162 | ||
163 | MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver"); | |
164 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
165 | MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>"); | |
166 | MODULE_LICENSE("GPL v2"); |