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1 | /* |
2 | * tps65910.c -- TI TPS6591x |
3 | * |
4 | * Copyright 2010 Texas Instruments Inc. |
5 | * |
6 | * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU General Public License as published by the |
10 | * Free Software Foundation; either version 2 of the License, or (at your |
11 | * option) any later version. |
12 | * |
13 | */ |
14 | |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/err.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/debugfs.h> |
22 | #include <linux/gpio.h> |
23 | #include <linux/mfd/tps65910.h> |
24 | |
25 | #define COMP 0 |
26 | #define COMP1 1 |
27 | #define COMP2 2 |
28 | |
29 | /* Comparator 1 voltage selection table in millivolts */ |
30 | static const u16 COMP_VSEL_TABLE[] = { |
31 | 0, 2500, 2500, 2500, 2500, 2550, 2600, 2650, |
32 | 2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050, |
33 | 3100, 3150, 3200, 3250, 3300, 3350, 3400, 3450, |
34 | 3500, |
35 | }; |
36 | |
37 | struct comparator { |
38 | const char *name; |
39 | int reg; |
40 | int uV_max; |
41 | const u16 *vsel_table; |
42 | }; |
43 | |
44 | static struct comparator tps_comparators[] = { |
45 | { |
46 | .name = "COMP1", |
47 | .reg = TPS65911_VMBCH, |
48 | .uV_max = 3500, |
49 | .vsel_table = COMP_VSEL_TABLE, |
50 | }, |
51 | { |
52 | .name = "COMP2", |
53 | .reg = TPS65911_VMBCH2, |
54 | .uV_max = 3500, |
55 | .vsel_table = COMP_VSEL_TABLE, |
56 | }, |
57 | }; |
58 | |
59 | static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage) |
60 | { |
61 | struct comparator tps_comp = tps_comparators[id]; |
62 | int curr_voltage = 0; |
63 | int ret; |
64 | u8 index = 0, val; |
65 | |
66 | if (id == COMP) |
67 | return 0; |
68 | |
69 | while (curr_voltage < tps_comp.uV_max) { |
70 | curr_voltage = tps_comp.vsel_table[index]; |
71 | if (curr_voltage >= voltage) |
72 | break; |
73 | else if (curr_voltage < voltage) |
74 | index ++; |
75 | } |
76 | |
77 | if (curr_voltage > tps_comp.uV_max) |
78 | return -EINVAL; |
79 | |
80 | val = index << 1; |
81 | ret = tps65910->write(tps65910, tps_comp.reg, 1, &val); |
82 | |
83 | return ret; |
84 | } |
85 | |
86 | static int comp_threshold_get(struct tps65910 *tps65910, int id) |
87 | { |
88 | struct comparator tps_comp = tps_comparators[id]; |
89 | int ret; |
90 | u8 val; |
91 | |
92 | if (id == COMP) |
93 | return 0; |
94 | |
95 | ret = tps65910->read(tps65910, tps_comp.reg, 1, &val); |
96 | if (ret < 0) |
97 | return ret; |
98 | |
99 | val >>= 1; |
100 | return tps_comp.vsel_table[val]; |
101 | } |
102 | |
103 | static ssize_t comp_threshold_show(struct device *dev, |
104 | struct device_attribute *attr, char *buf) |
105 | { |
106 | struct tps65910 *tps65910 = dev_get_drvdata(dev->parent); |
107 | struct attribute comp_attr = attr->attr; |
108 | int id, uVolt; |
109 | |
110 | if (!strcmp(comp_attr.name, "comp1_threshold")) |
111 | id = COMP1; |
112 | else if (!strcmp(comp_attr.name, "comp2_threshold")) |
113 | id = COMP2; |
114 | else |
115 | return -EINVAL; |
116 | |
117 | uVolt = comp_threshold_get(tps65910, id); |
118 | |
119 | return sprintf(buf, "%d\n", uVolt); |
120 | } |
121 | |
122 | static DEVICE_ATTR(comp1_threshold, S_IRUGO, comp_threshold_show, NULL); |
123 | static DEVICE_ATTR(comp2_threshold, S_IRUGO, comp_threshold_show, NULL); |
124 | |
125 | static int tps65911_comparator_probe(struct platform_device *pdev) |
126 | { |
127 | struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent); |
128 | struct tps65910_board *pdata = dev_get_platdata(tps65910->dev); |
129 | int ret; |
130 | |
131 | ret = comp_threshold_set(tps65910, COMP1, pdata->vmbch_threshold); |
132 | if (ret < 0) { |
133 | dev_err(&pdev->dev, "cannot set COMP1 threshold\n"); |
134 | return ret; |
135 | } |
136 | |
137 | ret = comp_threshold_set(tps65910, COMP2, pdata->vmbch2_threshold); |
138 | if (ret < 0) { |
139 | dev_err(&pdev->dev, "cannot set COMP2 threshold\n"); |
140 | return ret; |
141 | } |
142 | |
143 | /* Create sysfs entry */ |
144 | ret = device_create_file(&pdev->dev, &dev_attr_comp1_threshold); |
145 | if (ret < 0) |
146 | dev_err(&pdev->dev, "failed to add COMP1 sysfs file\n"); |
147 | |
148 | ret = device_create_file(&pdev->dev, &dev_attr_comp2_threshold); |
149 | if (ret < 0) |
150 | dev_err(&pdev->dev, "failed to add COMP2 sysfs file\n"); |
151 | |
152 | return ret; |
153 | } |
154 | |
155 | static int tps65911_comparator_remove(struct platform_device *pdev) |
156 | { |
157 | struct tps65910 *tps65910; |
158 | |
159 | tps65910 = dev_get_drvdata(pdev->dev.parent); |
160 | device_remove_file(&pdev->dev, &dev_attr_comp2_threshold); |
161 | device_remove_file(&pdev->dev, &dev_attr_comp1_threshold); |
162 | |
163 | return 0; |
164 | } |
165 | |
166 | static struct platform_driver tps65911_comparator_driver = { |
167 | .driver = { |
168 | .name = "tps65911-comparator", |
169 | .owner = THIS_MODULE, |
170 | }, |
171 | .probe = tps65911_comparator_probe, |
172 | .remove = tps65911_comparator_remove, |
173 | }; |
174 | |
175 | static int __init tps65911_comparator_init(void) |
176 | { |
177 | return platform_driver_register(&tps65911_comparator_driver); |
178 | } |
179 | subsys_initcall(tps65911_comparator_init); |
180 | |
181 | static void __exit tps65911_comparator_exit(void) |
182 | { |
183 | platform_driver_unregister(&tps65911_comparator_driver); |
184 | } |
185 | module_exit(tps65911_comparator_exit); |
186 | |
187 | MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>"); |
188 | MODULE_DESCRIPTION("TPS65911 comparator driver"); |
189 | MODULE_LICENSE("GPL v2"); |
190 | MODULE_ALIAS("platform:tps65911-comparator"); |
191 |
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