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7d9e7e9f PP |
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> | |
54f4dedb | 17 | #include <linux/module.h> |
7d9e7e9f PP |
18 | |
19 | /* | |
20 | * The HTC ASIC3 LED GPIOs are inputs, not outputs. | |
21 | * Hence we turn the LEDs on/off via the TimeBase register. | |
22 | */ | |
23 | ||
24 | /* | |
25 | * When TimeBase is 4 the clock resolution is about 32Hz. | |
26 | * This driver supports hardware blinking with an on+off | |
27 | * period from 62ms (2 clocks) to 125s (4000 clocks). | |
28 | */ | |
29 | #define MS_TO_CLK(ms) DIV_ROUND_CLOSEST(((ms)*1024), 32000) | |
30 | #define CLK_TO_MS(clk) (((clk)*32000)/1024) | |
31 | #define MAX_CLK 4000 /* Fits into 12-bit Time registers */ | |
32 | #define MAX_MS CLK_TO_MS(MAX_CLK) | |
33 | ||
34 | static const unsigned int led_n_base[ASIC3_NUM_LEDS] = { | |
35 | [0] = ASIC3_LED_0_Base, | |
36 | [1] = ASIC3_LED_1_Base, | |
37 | [2] = ASIC3_LED_2_Base, | |
38 | }; | |
39 | ||
40 | static void brightness_set(struct led_classdev *cdev, | |
41 | enum led_brightness value) | |
42 | { | |
43 | struct platform_device *pdev = to_platform_device(cdev->dev->parent); | |
44 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
45 | struct asic3 *asic = dev_get_drvdata(pdev->dev.parent); | |
46 | u32 timebase; | |
47 | unsigned int base; | |
48 | ||
49 | timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4); | |
50 | ||
51 | base = led_n_base[cell->id]; | |
52 | asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32); | |
53 | asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32); | |
54 | asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0); | |
55 | asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase); | |
56 | } | |
57 | ||
58 | static int blink_set(struct led_classdev *cdev, | |
59 | unsigned long *delay_on, | |
60 | unsigned long *delay_off) | |
61 | { | |
62 | struct platform_device *pdev = to_platform_device(cdev->dev->parent); | |
63 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
64 | struct asic3 *asic = dev_get_drvdata(pdev->dev.parent); | |
65 | u32 on; | |
66 | u32 off; | |
67 | unsigned int base; | |
68 | ||
69 | if (*delay_on > MAX_MS || *delay_off > MAX_MS) | |
70 | return -EINVAL; | |
71 | ||
72 | if (*delay_on == 0 && *delay_off == 0) { | |
73 | /* If both are zero then a sensible default should be chosen */ | |
74 | on = MS_TO_CLK(500); | |
75 | off = MS_TO_CLK(500); | |
76 | } else { | |
77 | on = MS_TO_CLK(*delay_on); | |
78 | off = MS_TO_CLK(*delay_off); | |
79 | if ((on + off) > MAX_CLK) | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | base = led_n_base[cell->id]; | |
84 | asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off)); | |
85 | asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on); | |
86 | asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0); | |
87 | asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4)); | |
88 | ||
89 | *delay_on = CLK_TO_MS(on); | |
90 | *delay_off = CLK_TO_MS(off); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
98ea1ea2 | 95 | static int asic3_led_probe(struct platform_device *pdev) |
7d9e7e9f | 96 | { |
87aae1ea | 97 | struct asic3_led *led = dev_get_platdata(&pdev->dev); |
7d9e7e9f PP |
98 | int ret; |
99 | ||
100 | ret = mfd_cell_enable(pdev); | |
101 | if (ret < 0) | |
60a0aadb | 102 | return ret; |
7d9e7e9f | 103 | |
60a0aadb BW |
104 | led->cdev = devm_kzalloc(&pdev->dev, sizeof(struct led_classdev), |
105 | GFP_KERNEL); | |
7d9e7e9f PP |
106 | if (!led->cdev) { |
107 | ret = -ENOMEM; | |
60a0aadb | 108 | goto out; |
7d9e7e9f PP |
109 | } |
110 | ||
111 | led->cdev->name = led->name; | |
e0b13b5b | 112 | led->cdev->flags = LED_CORE_SUSPENDRESUME; |
7d9e7e9f PP |
113 | led->cdev->brightness_set = brightness_set; |
114 | led->cdev->blink_set = blink_set; | |
e0b13b5b | 115 | led->cdev->default_trigger = led->default_trigger; |
7d9e7e9f PP |
116 | |
117 | ret = led_classdev_register(&pdev->dev, led->cdev); | |
118 | if (ret < 0) | |
60a0aadb | 119 | goto out; |
7d9e7e9f PP |
120 | |
121 | return 0; | |
122 | ||
60a0aadb | 123 | out: |
7d9e7e9f | 124 | (void) mfd_cell_disable(pdev); |
7d9e7e9f PP |
125 | return ret; |
126 | } | |
127 | ||
678e8a6b | 128 | static int asic3_led_remove(struct platform_device *pdev) |
7d9e7e9f | 129 | { |
87aae1ea | 130 | struct asic3_led *led = dev_get_platdata(&pdev->dev); |
7d9e7e9f PP |
131 | |
132 | led_classdev_unregister(led->cdev); | |
133 | ||
7d9e7e9f PP |
134 | return mfd_cell_disable(pdev); |
135 | } | |
136 | ||
df92d5ff | 137 | #ifdef CONFIG_PM_SLEEP |
e0b13b5b PP |
138 | static int asic3_led_suspend(struct device *dev) |
139 | { | |
140 | struct platform_device *pdev = to_platform_device(dev); | |
141 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
142 | int ret; | |
143 | ||
144 | ret = 0; | |
145 | if (cell->suspend) | |
146 | ret = (*cell->suspend)(pdev); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | static int asic3_led_resume(struct device *dev) | |
152 | { | |
153 | struct platform_device *pdev = to_platform_device(dev); | |
154 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
155 | int ret; | |
156 | ||
157 | ret = 0; | |
158 | if (cell->resume) | |
159 | ret = (*cell->resume)(pdev); | |
160 | ||
161 | return ret; | |
162 | } | |
df92d5ff | 163 | #endif |
e0b13b5b | 164 | |
df92d5ff | 165 | static SIMPLE_DEV_PM_OPS(asic3_led_pm_ops, asic3_led_suspend, asic3_led_resume); |
e0b13b5b | 166 | |
7d9e7e9f PP |
167 | static struct platform_driver asic3_led_driver = { |
168 | .probe = asic3_led_probe, | |
df07cf81 | 169 | .remove = asic3_led_remove, |
7d9e7e9f PP |
170 | .driver = { |
171 | .name = "leds-asic3", | |
172 | .owner = THIS_MODULE, | |
e0b13b5b | 173 | .pm = &asic3_led_pm_ops, |
7d9e7e9f PP |
174 | }, |
175 | }; | |
176 | ||
892a8843 | 177 | module_platform_driver(asic3_led_driver); |
7d9e7e9f PP |
178 | |
179 | MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>"); | |
180 | MODULE_DESCRIPTION("HTC ASIC3 LED driver"); | |
181 | MODULE_LICENSE("GPL"); | |
892a8843 | 182 | MODULE_ALIAS("platform:leds-asic3"); |