1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * tps65910.c  --  TI TPS6591x
4 *
5 * Copyright 2010 Texas Instruments Inc.
6 *
7 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/err.h>
15#include <linux/platform_device.h>
16#include <linux/debugfs.h>
17#include <linux/gpio.h>
18#include <linux/mfd/tps65910.h>
19
20#define COMP1					0
21#define COMP2					1
22
23/* Comparator 1 voltage selection table in millivolts */
24static const u16 COMP_VSEL_TABLE[] = {
25	0, 2500, 2500, 2500, 2500, 2550, 2600, 2650,
26	2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050,
27	3100, 3150, 3200, 3250, 3300, 3350, 3400, 3450,
28	3500,
29};
30
31struct comparator {
32	const char *name;
33	int reg;
34	int uV_max;
35	const u16 *vsel_table;
36};
37
38static struct comparator tps_comparators[] = {
39	{
40		.name = "COMP1",
41		.reg = TPS65911_VMBCH,
42		.uV_max = 3500,
43		.vsel_table = COMP_VSEL_TABLE,
44	},
45	{
46		.name = "COMP2",
47		.reg = TPS65911_VMBCH2,
48		.uV_max = 3500,
49		.vsel_table = COMP_VSEL_TABLE,
50	},
51};
52
53static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage)
54{
55	struct comparator tps_comp = tps_comparators[id];
56	int curr_voltage = 0;
57	int ret;
58	u8 index = 0, val;
59
60	while (curr_voltage < tps_comp.uV_max) {
61		curr_voltage = tps_comp.vsel_table[index];
62		if (curr_voltage >= voltage)
63			break;
64		else if (curr_voltage < voltage)
65			index ++;
66	}
67
68	if (curr_voltage > tps_comp.uV_max)
69		return -EINVAL;
70
71	val = index << 1;
72	ret = regmap_write(tps65910->regmap, tps_comp.reg, val);
73
74	return ret;
75}
76
77static int comp_threshold_get(struct tps65910 *tps65910, int id)
78{
79	struct comparator tps_comp = tps_comparators[id];
80	unsigned int val;
81	int ret;
82
83	ret = regmap_read(tps65910->regmap, tps_comp.reg, &val);
84	if (ret < 0)
85		return ret;
86
87	val >>= 1;
88	return tps_comp.vsel_table[val];
89}
90
91static ssize_t comp_threshold_show(struct device *dev,
92				struct device_attribute *attr, char *buf)
93{
94	struct tps65910 *tps65910 = dev_get_drvdata(dev->parent);
95	struct attribute comp_attr = attr->attr;
96	int id, uVolt;
97
98	if (!strcmp(comp_attr.name, "comp1_threshold"))
99		id = COMP1;
100	else if (!strcmp(comp_attr.name, "comp2_threshold"))
101		id = COMP2;
102	else
103		return -EINVAL;
104
105	uVolt = comp_threshold_get(tps65910, id);
106
107	return sprintf(buf, "%d\n", uVolt);
108}
109
110static DEVICE_ATTR(comp1_threshold, S_IRUGO, comp_threshold_show, NULL);
111static DEVICE_ATTR(comp2_threshold, S_IRUGO, comp_threshold_show, NULL);
112
113static int tps65911_comparator_probe(struct platform_device *pdev)
114{
115	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
116	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
117	int ret;
118
119	ret = comp_threshold_set(tps65910, COMP1,  pdata->vmbch_threshold);
120	if (ret < 0) {
121		dev_err(&pdev->dev, "cannot set COMP1 threshold\n");
122		return ret;
123	}
124
125	ret = comp_threshold_set(tps65910, COMP2, pdata->vmbch2_threshold);
126	if (ret < 0) {
127		dev_err(&pdev->dev, "cannot set COMP2 threshold\n");
128		return ret;
129	}
130
131	/* Create sysfs entry */
132	ret = device_create_file(&pdev->dev, &dev_attr_comp1_threshold);
133	if (ret < 0)
134		dev_err(&pdev->dev, "failed to add COMP1 sysfs file\n");
135
136	ret = device_create_file(&pdev->dev, &dev_attr_comp2_threshold);
137	if (ret < 0)
138		dev_err(&pdev->dev, "failed to add COMP2 sysfs file\n");
139
140	return ret;
141}
142
143static void tps65911_comparator_remove(struct platform_device *pdev)
144{
145	struct tps65910 *tps65910;
146
147	tps65910 = dev_get_drvdata(pdev->dev.parent);
148	device_remove_file(&pdev->dev, &dev_attr_comp2_threshold);
149	device_remove_file(&pdev->dev, &dev_attr_comp1_threshold);
150}
151
152static struct platform_driver tps65911_comparator_driver = {
153	.driver = {
154		.name = "tps65911-comparator",
155	},
156	.probe = tps65911_comparator_probe,
157	.remove_new = tps65911_comparator_remove,
158};
159
160static int __init tps65911_comparator_init(void)
161{
162	return platform_driver_register(&tps65911_comparator_driver);
163}
164subsys_initcall(tps65911_comparator_init);
165
166static void __exit tps65911_comparator_exit(void)
167{
168	platform_driver_unregister(&tps65911_comparator_driver);
169}
170module_exit(tps65911_comparator_exit);
171
172MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
173MODULE_DESCRIPTION("TPS65911 comparator driver");
174MODULE_LICENSE("GPL v2");
175MODULE_ALIAS("platform:tps65911-comparator");
176