1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Dollar Cove TI PMIC operation region driver
4  * Copyright (C) 2014 Intel Corporation. All rights reserved.
5  *
6  * Rewritten and cleaned up
7  * Copyright (C) 2017 Takashi Iwai <tiwai@suse.de>
8  */
9 
10 #include <linux/acpi.h>
11 #include <linux/init.h>
12 #include <linux/mfd/intel_soc_pmic.h>
13 #include <linux/platform_device.h>
14 #include "intel_pmic.h"
15 
16 /* registers stored in 16bit BE (high:low, total 10bit) */
17 #define CHTDC_TI_VBAT		0x54
18 #define CHTDC_TI_DIETEMP	0x56
19 #define CHTDC_TI_BPTHERM	0x58
20 #define CHTDC_TI_GPADC		0x5a
21 
22 static struct pmic_table chtdc_ti_power_table[] = {
23 	{ .address = 0x00, .reg = 0x41 },
24 	{ .address = 0x04, .reg = 0x42 },
25 	{ .address = 0x08, .reg = 0x43 },
26 	{ .address = 0x0c, .reg = 0x45 },
27 	{ .address = 0x10, .reg = 0x46 },
28 	{ .address = 0x14, .reg = 0x47 },
29 	{ .address = 0x18, .reg = 0x48 },
30 	{ .address = 0x1c, .reg = 0x49 },
31 	{ .address = 0x20, .reg = 0x4a },
32 	{ .address = 0x24, .reg = 0x4b },
33 	{ .address = 0x28, .reg = 0x4c },
34 	{ .address = 0x2c, .reg = 0x4d },
35 	{ .address = 0x30, .reg = 0x4e },
36 };
37 
38 static struct pmic_table chtdc_ti_thermal_table[] = {
39 	{
40 		.address = 0x00,
41 		.reg = CHTDC_TI_GPADC
42 	},
43 	{
44 		.address = 0x0c,
45 		.reg = CHTDC_TI_GPADC
46 	},
47 	/* TMP2 -> SYSTEMP */
48 	{
49 		.address = 0x18,
50 		.reg = CHTDC_TI_GPADC
51 	},
52 	/* TMP3 -> BPTHERM */
53 	{
54 		.address = 0x24,
55 		.reg = CHTDC_TI_BPTHERM
56 	},
57 	{
58 		.address = 0x30,
59 		.reg = CHTDC_TI_GPADC
60 	},
61 	/* TMP5 -> DIETEMP */
62 	{
63 		.address = 0x3c,
64 		.reg = CHTDC_TI_DIETEMP
65 	},
66 };
67 
68 static int chtdc_ti_pmic_get_power(struct regmap *regmap, int reg, int bit,
69 				   u64 *value)
70 {
71 	int data;
72 
73 	if (regmap_read(regmap, reg, &data))
74 		return -EIO;
75 
76 	*value = data & 1;
77 	return 0;
78 }
79 
80 static int chtdc_ti_pmic_update_power(struct regmap *regmap, int reg, int bit,
81 				      bool on)
82 {
83 	return regmap_update_bits(regmap, reg, 1, on);
84 }
85 
86 static int chtdc_ti_pmic_get_raw_temp(struct regmap *regmap, int reg)
87 {
88 	u8 buf[2];
89 
90 	if (regmap_bulk_read(regmap, reg, buf, 2))
91 		return -EIO;
92 
93 	/* stored in big-endian */
94 	return ((buf[0] & 0x03) << 8) | buf[1];
95 }
96 
97 static struct intel_pmic_opregion_data chtdc_ti_pmic_opregion_data = {
98 	.get_power = chtdc_ti_pmic_get_power,
99 	.update_power = chtdc_ti_pmic_update_power,
100 	.get_raw_temp = chtdc_ti_pmic_get_raw_temp,
101 	.power_table = chtdc_ti_power_table,
102 	.power_table_count = ARRAY_SIZE(chtdc_ti_power_table),
103 	.thermal_table = chtdc_ti_thermal_table,
104 	.thermal_table_count = ARRAY_SIZE(chtdc_ti_thermal_table),
105 };
106 
107 static int chtdc_ti_pmic_opregion_probe(struct platform_device *pdev)
108 {
109 	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
110 	int err;
111 
112 	err = intel_pmic_install_opregion_handler(&pdev->dev,
113 			ACPI_HANDLE(pdev->dev.parent), pmic->regmap,
114 			&chtdc_ti_pmic_opregion_data);
115 	if (err < 0)
116 		return err;
117 
118 	/* Re-enumerate devices depending on PMIC */
119 	acpi_walk_dep_device_list(ACPI_HANDLE(pdev->dev.parent));
120 	return 0;
121 }
122 
123 static const struct platform_device_id chtdc_ti_pmic_opregion_id_table[] = {
124 	{ .name = "chtdc_ti_region" },
125 	{},
126 };
127 
128 static struct platform_driver chtdc_ti_pmic_opregion_driver = {
129 	.probe = chtdc_ti_pmic_opregion_probe,
130 	.driver = {
131 		.name = "cht_dollar_cove_ti_pmic",
132 	},
133 	.id_table = chtdc_ti_pmic_opregion_id_table,
134 };
135 builtin_platform_driver(chtdc_ti_pmic_opregion_driver);
136