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 */
24 static 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
31 struct comparator {
32 const char *name;
33 int reg;
34 int uV_max;
35 const u16 *vsel_table;
36 };
37
38 static 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
comp_threshold_set(struct tps65910 * tps65910,int id,int voltage)53 static 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 = tps65910_reg_write(tps65910, tps_comp.reg, val);
73
74 return ret;
75 }
76
comp_threshold_get(struct tps65910 * tps65910,int id)77 static 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 = tps65910_reg_read(tps65910, tps_comp.reg, &val);
84 if (ret < 0)
85 return ret;
86
87 val >>= 1;
88 return tps_comp.vsel_table[val];
89 }
90
comp_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)91 static 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
110 static DEVICE_ATTR(comp1_threshold, S_IRUGO, comp_threshold_show, NULL);
111 static DEVICE_ATTR(comp2_threshold, S_IRUGO, comp_threshold_show, NULL);
112
tps65911_comparator_probe(struct platform_device * pdev)113 static 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
tps65911_comparator_remove(struct platform_device * pdev)143 static int 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 return 0;
152 }
153
154 static struct platform_driver tps65911_comparator_driver = {
155 .driver = {
156 .name = "tps65911-comparator",
157 },
158 .probe = tps65911_comparator_probe,
159 .remove = tps65911_comparator_remove,
160 };
161
tps65911_comparator_init(void)162 static int __init tps65911_comparator_init(void)
163 {
164 return platform_driver_register(&tps65911_comparator_driver);
165 }
166 subsys_initcall(tps65911_comparator_init);
167
tps65911_comparator_exit(void)168 static void __exit tps65911_comparator_exit(void)
169 {
170 platform_driver_unregister(&tps65911_comparator_driver);
171 }
172 module_exit(tps65911_comparator_exit);
173
174 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
175 MODULE_DESCRIPTION("TPS65911 comparator driver");
176 MODULE_LICENSE("GPL v2");
177 MODULE_ALIAS("platform:tps65911-comparator");
178
