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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7d9e7e9f PP |
2 | /* |
3 | * Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.com> | |
7d9e7e9f PP |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7d9e7e9f PP |
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> | |
54f4dedb | 13 | #include <linux/module.h> |
7d9e7e9f PP |
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 | ||
30 | static 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 | ||
36 | static 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 | ||
54 | static 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 | ||
98ea1ea2 | 91 | static int asic3_led_probe(struct platform_device *pdev) |
7d9e7e9f | 92 | { |
87aae1ea | 93 | struct asic3_led *led = dev_get_platdata(&pdev->dev); |
7d9e7e9f PP |
94 | int ret; |
95 | ||
96 | ret = mfd_cell_enable(pdev); | |
97 | if (ret < 0) | |
60a0aadb | 98 | return ret; |
7d9e7e9f | 99 | |
60a0aadb BW |
100 | led->cdev = devm_kzalloc(&pdev->dev, sizeof(struct led_classdev), |
101 | GFP_KERNEL); | |
7d9e7e9f PP |
102 | if (!led->cdev) { |
103 | ret = -ENOMEM; | |
60a0aadb | 104 | goto out; |
7d9e7e9f PP |
105 | } |
106 | ||
107 | led->cdev->name = led->name; | |
e0b13b5b | 108 | led->cdev->flags = LED_CORE_SUSPENDRESUME; |
7d9e7e9f PP |
109 | led->cdev->brightness_set = brightness_set; |
110 | led->cdev->blink_set = blink_set; | |
e0b13b5b | 111 | led->cdev->default_trigger = led->default_trigger; |
7d9e7e9f PP |
112 | |
113 | ret = led_classdev_register(&pdev->dev, led->cdev); | |
114 | if (ret < 0) | |
60a0aadb | 115 | goto out; |
7d9e7e9f PP |
116 | |
117 | return 0; | |
118 | ||
60a0aadb | 119 | out: |
7d9e7e9f | 120 | (void) mfd_cell_disable(pdev); |
7d9e7e9f PP |
121 | return ret; |
122 | } | |
123 | ||
678e8a6b | 124 | static int asic3_led_remove(struct platform_device *pdev) |
7d9e7e9f | 125 | { |
87aae1ea | 126 | struct asic3_led *led = dev_get_platdata(&pdev->dev); |
7d9e7e9f PP |
127 | |
128 | led_classdev_unregister(led->cdev); | |
129 | ||
7d9e7e9f PP |
130 | return mfd_cell_disable(pdev); |
131 | } | |
132 | ||
df92d5ff | 133 | #ifdef CONFIG_PM_SLEEP |
e0b13b5b PP |
134 | static 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 | ||
147 | static 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 | } | |
df92d5ff | 159 | #endif |
e0b13b5b | 160 | |
df92d5ff | 161 | static SIMPLE_DEV_PM_OPS(asic3_led_pm_ops, asic3_led_suspend, asic3_led_resume); |
e0b13b5b | 162 | |
7d9e7e9f PP |
163 | static struct platform_driver asic3_led_driver = { |
164 | .probe = asic3_led_probe, | |
df07cf81 | 165 | .remove = asic3_led_remove, |
7d9e7e9f PP |
166 | .driver = { |
167 | .name = "leds-asic3", | |
e0b13b5b | 168 | .pm = &asic3_led_pm_ops, |
7d9e7e9f PP |
169 | }, |
170 | }; | |
171 | ||
892a8843 | 172 | module_platform_driver(asic3_led_driver); |
7d9e7e9f PP |
173 | |
174 | MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>"); | |
175 | MODULE_DESCRIPTION("HTC ASIC3 LED driver"); | |
176 | MODULE_LICENSE("GPL"); | |
892a8843 | 177 | MODULE_ALIAS("platform:leds-asic3"); |