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(struct thermal_zone_device *tz, int *temp) |
48 | { |
49 | struct max77620_therm_info *mtherm = thermal_zone_device_priv(tzd: tz); |
50 | unsigned int val; |
51 | int ret; |
52 | |
53 | ret = regmap_read(map: mtherm->rmap, MAX77620_REG_STATLBT, val: &val); |
54 | if (ret < 0) |
55 | return ret; |
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 | |
67 | static const struct thermal_zone_device_ops max77620_thermal_ops = { |
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 | |
80 | thermal_zone_device_update(mtherm->tz_device, |
81 | THERMAL_EVENT_UNSPECIFIED); |
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(dev: &pdev->dev, size: 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 | |
102 | mtherm->dev = &pdev->dev; |
103 | mtherm->rmap = dev_get_regmap(dev: pdev->dev.parent, NULL); |
104 | if (!mtherm->rmap) { |
105 | dev_err(&pdev->dev, "Failed to get parent regmap\n" ); |
106 | return -ENODEV; |
107 | } |
108 | |
109 | /* |
110 | * The reference taken to the parent's node which will be balanced on |
111 | * reprobe or on platform-device release. |
112 | */ |
113 | device_set_of_node_from_dev(dev: &pdev->dev, dev2: pdev->dev.parent); |
114 | |
115 | mtherm->tz_device = devm_thermal_of_zone_register(dev: &pdev->dev, id: 0, |
116 | data: mtherm, ops: &max77620_thermal_ops); |
117 | if (IS_ERR(ptr: mtherm->tz_device)) |
118 | return PTR_ERR(ptr: mtherm->tz_device); |
119 | |
120 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: mtherm->irq_tjalarm1, NULL, |
121 | thread_fn: max77620_thermal_irq, |
122 | IRQF_ONESHOT | IRQF_SHARED, |
123 | devname: dev_name(dev: &pdev->dev), dev_id: mtherm); |
124 | if (ret < 0) { |
125 | dev_err(&pdev->dev, "Failed to request irq1: %d\n" , ret); |
126 | return ret; |
127 | } |
128 | |
129 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: mtherm->irq_tjalarm2, NULL, |
130 | thread_fn: max77620_thermal_irq, |
131 | IRQF_ONESHOT | IRQF_SHARED, |
132 | devname: dev_name(dev: &pdev->dev), dev_id: mtherm); |
133 | if (ret < 0) { |
134 | dev_err(&pdev->dev, "Failed to request irq2: %d\n" , ret); |
135 | return ret; |
136 | } |
137 | |
138 | return 0; |
139 | } |
140 | |
141 | static struct platform_device_id max77620_thermal_devtype[] = { |
142 | { .name = "max77620-thermal" , }, |
143 | {}, |
144 | }; |
145 | MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype); |
146 | |
147 | static struct platform_driver max77620_thermal_driver = { |
148 | .driver = { |
149 | .name = "max77620-thermal" , |
150 | }, |
151 | .probe = max77620_thermal_probe, |
152 | .id_table = max77620_thermal_devtype, |
153 | }; |
154 | |
155 | module_platform_driver(max77620_thermal_driver); |
156 | |
157 | MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver" ); |
158 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>" ); |
159 | MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>" ); |
160 | MODULE_LICENSE("GPL v2" ); |
161 | |