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 | |
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 = regmap_write(map: tps65910->regmap, reg: tps_comp.reg, val); |
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]; |
80 | unsigned int val; |
81 | int ret; |
82 | |
83 | ret = regmap_read(map: tps65910->regmap, reg: tps_comp.reg, val: &val); |
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: 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, fmt: "%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 | |
113 | static int tps65911_comparator_probe(struct platform_device *pdev) |
114 | { |
115 | struct tps65910 *tps65910 = dev_get_drvdata(dev: pdev->dev.parent); |
116 | struct tps65910_board *pdata = dev_get_platdata(dev: tps65910->dev); |
117 | int ret; |
118 | |
119 | ret = comp_threshold_set(tps65910, COMP1, voltage: 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, voltage: 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(device: &pdev->dev, entry: &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(device: &pdev->dev, entry: &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 | |
143 | static int tps65911_comparator_remove(struct platform_device *pdev) |
144 | { |
145 | struct tps65910 *tps65910; |
146 | |
147 | tps65910 = dev_get_drvdata(dev: pdev->dev.parent); |
148 | device_remove_file(dev: &pdev->dev, attr: &dev_attr_comp2_threshold); |
149 | device_remove_file(dev: &pdev->dev, attr: &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 | |
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 | |
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 | |