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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6851ad3a JEC |
2 | /* |
3 | * tps65910.c -- TI TPS6591x | |
4 | * | |
5 | * Copyright 2010 Texas Instruments Inc. | |
6 | * | |
7 | * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> | |
6851ad3a JEC |
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 | ||
1768391c LJ |
20 | #define COMP1 0 |
21 | #define COMP2 1 | |
6851ad3a | 22 | |
91fe4d50 | 23 | /* Comparator 1 voltage selection table in millivolts */ |
6851ad3a JEC |
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 | ||
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 | ||
6851ad3a JEC |
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; | |
da7d203f | 72 | ret = regmap_write(tps65910->regmap, tps_comp.reg, val); |
6851ad3a JEC |
73 | |
74 | return ret; | |
75 | } | |
76 | ||
77 | static int comp_threshold_get(struct tps65910 *tps65910, int id) | |
78 | { | |
79 | struct comparator tps_comp = tps_comparators[id]; | |
ac188616 | 80 | unsigned int val; |
6851ad3a | 81 | int ret; |
6851ad3a | 82 | |
da7d203f | 83 | ret = regmap_read(tps65910->regmap, tps_comp.reg, &val); |
6851ad3a JEC |
84 | if (ret < 0) |
85 | return ret; | |
86 | ||
87 | val >>= 1; | |
88 | return tps_comp.vsel_table[val]; | |
89 | } | |
90 | ||
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 | ||
f791be49 | 113 | static int tps65911_comparator_probe(struct platform_device *pdev) |
6851ad3a JEC |
114 | { |
115 | struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent); | |
1e8ece5c | 116 | struct tps65910_board *pdata = dev_get_platdata(tps65910->dev); |
6851ad3a JEC |
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) { | |
5a4432b9 | 127 | dev_err(&pdev->dev, "cannot set COMP2 threshold\n"); |
6851ad3a JEC |
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 | ||
66d721ca | 143 | static void tps65911_comparator_remove(struct platform_device *pdev) |
6851ad3a JEC |
144 | { |
145 | struct tps65910 *tps65910; | |
146 | ||
147 | tps65910 = dev_get_drvdata(pdev->dev.parent); | |
2f223341 AL |
148 | device_remove_file(&pdev->dev, &dev_attr_comp2_threshold); |
149 | device_remove_file(&pdev->dev, &dev_attr_comp1_threshold); | |
6851ad3a JEC |
150 | } |
151 | ||
152 | static struct platform_driver tps65911_comparator_driver = { | |
153 | .driver = { | |
154 | .name = "tps65911-comparator", | |
6851ad3a JEC |
155 | }, |
156 | .probe = tps65911_comparator_probe, | |
66d721ca | 157 | .remove_new = tps65911_comparator_remove, |
6851ad3a JEC |
158 | }; |
159 | ||
160 | static int __init tps65911_comparator_init(void) | |
161 | { | |
162 | return platform_driver_register(&tps65911_comparator_driver); | |
163 | } | |
164 | subsys_initcall(tps65911_comparator_init); | |
165 | ||
166 | static void __exit tps65911_comparator_exit(void) | |
167 | { | |
168 | platform_driver_unregister(&tps65911_comparator_driver); | |
169 | } | |
170 | module_exit(tps65911_comparator_exit); | |
171 | ||
172 | MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>"); | |
173 | MODULE_DESCRIPTION("TPS65911 comparator driver"); | |
174 | MODULE_LICENSE("GPL v2"); | |
175 | MODULE_ALIAS("platform:tps65911-comparator"); |