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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.com>
4 */
5
6#include <linux/kernel.h>
7#include <linux/platform_device.h>
8#include <linux/leds.h>
9#include <linux/slab.h>
10
11#include <linux/mfd/asic3.h>
12#include <linux/mfd/core.h>
13#include <linux/module.h>
14
15/*
16 * The HTC ASIC3 LED GPIOs are inputs, not outputs.
17 * Hence we turn the LEDs on/off via the TimeBase register.
18 */
19
20/*
21 * When TimeBase is 4 the clock resolution is about 32Hz.
22 * This driver supports hardware blinking with an on+off
23 * period from 62ms (2 clocks) to 125s (4000 clocks).
24 */
25#define MS_TO_CLK(ms) DIV_ROUND_CLOSEST(((ms)*1024), 32000)
26#define CLK_TO_MS(clk) (((clk)*32000)/1024)
27#define MAX_CLK 4000 /* Fits into 12-bit Time registers */
28#define MAX_MS CLK_TO_MS(MAX_CLK)
29
30static const unsigned int led_n_base[ASIC3_NUM_LEDS] = {
31 [0] = ASIC3_LED_0_Base,
32 [1] = ASIC3_LED_1_Base,
33 [2] = ASIC3_LED_2_Base,
34};
35
36static void brightness_set(struct led_classdev *cdev,
37 enum led_brightness value)
38{
39 struct platform_device *pdev = to_platform_device(cdev->dev->parent);
40 const struct mfd_cell *cell = mfd_get_cell(pdev);
41 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
42 u32 timebase;
43 unsigned int base;
44
45 timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4);
46
47 base = led_n_base[cell->id];
48 asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32);
49 asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32);
50 asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
51 asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase);
52}
53
54static int blink_set(struct led_classdev *cdev,
55 unsigned long *delay_on,
56 unsigned long *delay_off)
57{
58 struct platform_device *pdev = to_platform_device(cdev->dev->parent);
59 const struct mfd_cell *cell = mfd_get_cell(pdev);
60 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
61 u32 on;
62 u32 off;
63 unsigned int base;
64
65 if (*delay_on > MAX_MS || *delay_off > MAX_MS)
66 return -EINVAL;
67
68 if (*delay_on == 0 && *delay_off == 0) {
69 /* If both are zero then a sensible default should be chosen */
70 on = MS_TO_CLK(500);
71 off = MS_TO_CLK(500);
72 } else {
73 on = MS_TO_CLK(*delay_on);
74 off = MS_TO_CLK(*delay_off);
75 if ((on + off) > MAX_CLK)
76 return -EINVAL;
77 }
78
79 base = led_n_base[cell->id];
80 asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off));
81 asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on);
82 asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
83 asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4));
84
85 *delay_on = CLK_TO_MS(on);
86 *delay_off = CLK_TO_MS(off);
87
88 return 0;
89}
90
91static int asic3_led_probe(struct platform_device *pdev)
92{
93 struct asic3_led *led = dev_get_platdata(&pdev->dev);
94 int ret;
95
96 ret = mfd_cell_enable(pdev);
97 if (ret < 0)
98 return ret;
99
100 led->cdev = devm_kzalloc(&pdev->dev, sizeof(struct led_classdev),
101 GFP_KERNEL);
102 if (!led->cdev) {
103 ret = -ENOMEM;
104 goto out;
105 }
106
107 led->cdev->name = led->name;
108 led->cdev->flags = LED_CORE_SUSPENDRESUME;
109 led->cdev->brightness_set = brightness_set;
110 led->cdev->blink_set = blink_set;
111 led->cdev->default_trigger = led->default_trigger;
112
113 ret = led_classdev_register(&pdev->dev, led->cdev);
114 if (ret < 0)
115 goto out;
116
117 return 0;
118
119out:
120 (void) mfd_cell_disable(pdev);
121 return ret;
122}
123
124static int asic3_led_remove(struct platform_device *pdev)
125{
126 struct asic3_led *led = dev_get_platdata(&pdev->dev);
127
128 led_classdev_unregister(led->cdev);
129
130 return mfd_cell_disable(pdev);
131}
132
133#ifdef CONFIG_PM_SLEEP
134static int asic3_led_suspend(struct device *dev)
135{
136 struct platform_device *pdev = to_platform_device(dev);
137 const struct mfd_cell *cell = mfd_get_cell(pdev);
138 int ret;
139
140 ret = 0;
141 if (cell->suspend)
142 ret = (*cell->suspend)(pdev);
143
144 return ret;
145}
146
147static int asic3_led_resume(struct device *dev)
148{
149 struct platform_device *pdev = to_platform_device(dev);
150 const struct mfd_cell *cell = mfd_get_cell(pdev);
151 int ret;
152
153 ret = 0;
154 if (cell->resume)
155 ret = (*cell->resume)(pdev);
156
157 return ret;
158}
159#endif
160
161static SIMPLE_DEV_PM_OPS(asic3_led_pm_ops, asic3_led_suspend, asic3_led_resume);
162
163static struct platform_driver asic3_led_driver = {
164 .probe = asic3_led_probe,
165 .remove = asic3_led_remove,
166 .driver = {
167 .name = "leds-asic3",
168 .pm = &asic3_led_pm_ops,
169 },
170};
171
172module_platform_driver(asic3_led_driver);
173
174MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
175MODULE_DESCRIPTION("HTC ASIC3 LED driver");
176MODULE_LICENSE("GPL");
177MODULE_ALIAS("platform:leds-asic3");
1/*
2 * Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/platform_device.h>
12#include <linux/leds.h>
13#include <linux/slab.h>
14
15#include <linux/mfd/asic3.h>
16#include <linux/mfd/core.h>
17
18/*
19 * The HTC ASIC3 LED GPIOs are inputs, not outputs.
20 * Hence we turn the LEDs on/off via the TimeBase register.
21 */
22
23/*
24 * When TimeBase is 4 the clock resolution is about 32Hz.
25 * This driver supports hardware blinking with an on+off
26 * period from 62ms (2 clocks) to 125s (4000 clocks).
27 */
28#define MS_TO_CLK(ms) DIV_ROUND_CLOSEST(((ms)*1024), 32000)
29#define CLK_TO_MS(clk) (((clk)*32000)/1024)
30#define MAX_CLK 4000 /* Fits into 12-bit Time registers */
31#define MAX_MS CLK_TO_MS(MAX_CLK)
32
33static const unsigned int led_n_base[ASIC3_NUM_LEDS] = {
34 [0] = ASIC3_LED_0_Base,
35 [1] = ASIC3_LED_1_Base,
36 [2] = ASIC3_LED_2_Base,
37};
38
39static void brightness_set(struct led_classdev *cdev,
40 enum led_brightness value)
41{
42 struct platform_device *pdev = to_platform_device(cdev->dev->parent);
43 const struct mfd_cell *cell = mfd_get_cell(pdev);
44 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
45 u32 timebase;
46 unsigned int base;
47
48 timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4);
49
50 base = led_n_base[cell->id];
51 asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32);
52 asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32);
53 asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
54 asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase);
55}
56
57static int blink_set(struct led_classdev *cdev,
58 unsigned long *delay_on,
59 unsigned long *delay_off)
60{
61 struct platform_device *pdev = to_platform_device(cdev->dev->parent);
62 const struct mfd_cell *cell = mfd_get_cell(pdev);
63 struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
64 u32 on;
65 u32 off;
66 unsigned int base;
67
68 if (*delay_on > MAX_MS || *delay_off > MAX_MS)
69 return -EINVAL;
70
71 if (*delay_on == 0 && *delay_off == 0) {
72 /* If both are zero then a sensible default should be chosen */
73 on = MS_TO_CLK(500);
74 off = MS_TO_CLK(500);
75 } else {
76 on = MS_TO_CLK(*delay_on);
77 off = MS_TO_CLK(*delay_off);
78 if ((on + off) > MAX_CLK)
79 return -EINVAL;
80 }
81
82 base = led_n_base[cell->id];
83 asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off));
84 asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on);
85 asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
86 asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4));
87
88 *delay_on = CLK_TO_MS(on);
89 *delay_off = CLK_TO_MS(off);
90
91 return 0;
92}
93
94static int __devinit asic3_led_probe(struct platform_device *pdev)
95{
96 struct asic3_led *led = pdev->dev.platform_data;
97 int ret;
98
99 ret = mfd_cell_enable(pdev);
100 if (ret < 0)
101 goto ret0;
102
103 led->cdev = kzalloc(sizeof(struct led_classdev), GFP_KERNEL);
104 if (!led->cdev) {
105 ret = -ENOMEM;
106 goto ret1;
107 }
108
109 led->cdev->name = led->name;
110 led->cdev->default_trigger = led->default_trigger;
111 led->cdev->brightness_set = brightness_set;
112 led->cdev->blink_set = blink_set;
113
114 ret = led_classdev_register(&pdev->dev, led->cdev);
115 if (ret < 0)
116 goto ret2;
117
118 return 0;
119
120ret2:
121 kfree(led->cdev);
122ret1:
123 (void) mfd_cell_disable(pdev);
124ret0:
125 return ret;
126}
127
128static int __devexit asic3_led_remove(struct platform_device *pdev)
129{
130 struct asic3_led *led = pdev->dev.platform_data;
131
132 led_classdev_unregister(led->cdev);
133
134 kfree(led->cdev);
135
136 return mfd_cell_disable(pdev);
137}
138
139static struct platform_driver asic3_led_driver = {
140 .probe = asic3_led_probe,
141 .remove = __devexit_p(asic3_led_remove),
142 .driver = {
143 .name = "leds-asic3",
144 .owner = THIS_MODULE,
145 },
146};
147
148MODULE_ALIAS("platform:leds-asic3");
149
150static int __init asic3_led_init(void)
151{
152 return platform_driver_register(&asic3_led_driver);
153}
154
155static void __exit asic3_led_exit(void)
156{
157 platform_driver_unregister(&asic3_led_driver);
158}
159
160module_init(asic3_led_init);
161module_exit(asic3_led_exit);
162
163MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
164MODULE_DESCRIPTION("HTC ASIC3 LED driver");
165MODULE_LICENSE("GPL");