Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 1 | /* |
| 2 | * LED driver for Marvell 88PM860x |
| 3 | * |
| 4 | * Copyright (C) 2009 Marvell International Ltd. |
| 5 | * Haojian Zhuang <haojian.zhuang@marvell.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/i2c.h> |
| 17 | #include <linux/leds.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 19 | #include <linux/workqueue.h> |
| 20 | #include <linux/mfd/88pm860x.h> |
Paul Gortmaker | 54f4ded | 2011-07-03 13:56:03 -0400 | [diff] [blame] | 21 | #include <linux/module.h> |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 22 | |
| 23 | #define LED_PWM_SHIFT (3) |
| 24 | #define LED_PWM_MASK (0x1F) |
| 25 | #define LED_CURRENT_MASK (0x07 << 5) |
| 26 | |
| 27 | #define LED_BLINK_ON_MASK (0x07) |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 28 | #define LED_BLINK_MASK (0x7F) |
| 29 | |
| 30 | #define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66) |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 31 | #define LED_BLINK_ON_MIN LED_BLINK_ON(0) |
| 32 | #define LED_BLINK_ON_MAX LED_BLINK_ON(0x7) |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 33 | #define LED_ON_CONTINUOUS (0x0F << 3) |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 34 | #define LED_TO_ON(x) ((x - 66) / 66) |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 35 | |
| 36 | #define LED1_BLINK_EN (1 << 1) |
| 37 | #define LED2_BLINK_EN (1 << 2) |
| 38 | |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 39 | struct pm860x_led { |
| 40 | struct led_classdev cdev; |
| 41 | struct i2c_client *i2c; |
| 42 | struct work_struct work; |
| 43 | struct pm860x_chip *chip; |
| 44 | struct mutex lock; |
| 45 | char name[MFD_NAME_SIZE]; |
| 46 | |
| 47 | int port; |
| 48 | int iset; |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 49 | unsigned char brightness; |
| 50 | unsigned char current_brightness; |
| 51 | |
| 52 | int blink_data; |
| 53 | int blink_time; |
| 54 | int blink_on; |
| 55 | int blink_off; |
| 56 | }; |
| 57 | |
| 58 | /* return offset of color register */ |
| 59 | static inline int __led_off(int port) |
| 60 | { |
| 61 | int ret = -EINVAL; |
| 62 | |
| 63 | switch (port) { |
| 64 | case PM8606_LED1_RED: |
| 65 | case PM8606_LED1_GREEN: |
| 66 | case PM8606_LED1_BLUE: |
| 67 | ret = port - PM8606_LED1_RED + PM8606_RGB1B; |
| 68 | break; |
| 69 | case PM8606_LED2_RED: |
| 70 | case PM8606_LED2_GREEN: |
| 71 | case PM8606_LED2_BLUE: |
| 72 | ret = port - PM8606_LED2_RED + PM8606_RGB2B; |
| 73 | break; |
| 74 | } |
| 75 | return ret; |
| 76 | } |
| 77 | |
| 78 | /* return offset of blink register */ |
| 79 | static inline int __blink_off(int port) |
| 80 | { |
| 81 | int ret = -EINVAL; |
| 82 | |
| 83 | switch (port) { |
| 84 | case PM8606_LED1_RED: |
| 85 | case PM8606_LED1_GREEN: |
| 86 | case PM8606_LED1_BLUE: |
| 87 | ret = PM8606_RGB1A; |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 88 | break; |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 89 | case PM8606_LED2_RED: |
| 90 | case PM8606_LED2_GREEN: |
| 91 | case PM8606_LED2_BLUE: |
| 92 | ret = PM8606_RGB2A; |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 93 | break; |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 94 | } |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | static inline int __blink_ctl_mask(int port) |
| 99 | { |
| 100 | int ret = -EINVAL; |
| 101 | |
| 102 | switch (port) { |
| 103 | case PM8606_LED1_RED: |
| 104 | case PM8606_LED1_GREEN: |
| 105 | case PM8606_LED1_BLUE: |
| 106 | ret = LED1_BLINK_EN; |
| 107 | break; |
| 108 | case PM8606_LED2_RED: |
| 109 | case PM8606_LED2_GREEN: |
| 110 | case PM8606_LED2_BLUE: |
| 111 | ret = LED2_BLINK_EN; |
| 112 | break; |
| 113 | } |
| 114 | return ret; |
| 115 | } |
| 116 | |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 117 | static void pm860x_led_work(struct work_struct *work) |
| 118 | { |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 119 | |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 120 | struct pm860x_led *led; |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 121 | struct pm860x_chip *chip; |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 122 | unsigned char buf[3]; |
| 123 | int mask, ret; |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 124 | |
| 125 | led = container_of(work, struct pm860x_led, work); |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 126 | chip = led->chip; |
| 127 | mutex_lock(&led->lock); |
| 128 | if ((led->current_brightness == 0) && led->brightness) { |
| 129 | if (led->iset) { |
| 130 | pm860x_set_bits(led->i2c, __led_off(led->port), |
| 131 | LED_CURRENT_MASK, led->iset); |
| 132 | } |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 133 | pm860x_set_bits(led->i2c, __blink_off(led->port), |
| 134 | LED_BLINK_MASK, LED_ON_CONTINUOUS); |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 135 | mask = __blink_ctl_mask(led->port); |
| 136 | pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask); |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 137 | } |
| 138 | pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK, |
| 139 | led->brightness); |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 140 | |
| 141 | if (led->brightness == 0) { |
| 142 | pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf); |
| 143 | ret = buf[0] & LED_PWM_MASK; |
| 144 | ret |= buf[1] & LED_PWM_MASK; |
| 145 | ret |= buf[2] & LED_PWM_MASK; |
| 146 | if (ret == 0) { |
| 147 | /* unset current since no led is lighting */ |
| 148 | pm860x_set_bits(led->i2c, __led_off(led->port), |
| 149 | LED_CURRENT_MASK, 0); |
| 150 | mask = __blink_ctl_mask(led->port); |
| 151 | pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0); |
| 152 | } |
| 153 | } |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 154 | led->current_brightness = led->brightness; |
| 155 | dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", |
| 156 | __led_off(led->port), led->brightness); |
| 157 | mutex_unlock(&led->lock); |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static void pm860x_led_set(struct led_classdev *cdev, |
| 161 | enum led_brightness value) |
| 162 | { |
| 163 | struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); |
| 164 | |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 165 | data->brightness = value >> 3; |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 166 | schedule_work(&data->work); |
| 167 | } |
| 168 | |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 169 | static int pm860x_led_probe(struct platform_device *pdev) |
| 170 | { |
| 171 | struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 172 | struct pm860x_led_pdata *pdata; |
| 173 | struct pm860x_led *data; |
| 174 | struct resource *res; |
| 175 | int ret; |
| 176 | |
| 177 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 178 | if (res == NULL) { |
| 179 | dev_err(&pdev->dev, "No I/O resource!\n"); |
| 180 | return -EINVAL; |
| 181 | } |
| 182 | |
Samuel Ortiz | 07259a7 | 2011-04-06 16:26:56 +0200 | [diff] [blame] | 183 | pdata = pdev->dev.platform_data; |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 184 | if (pdata == NULL) { |
Haojian Zhuang | f5d59fc | 2010-09-08 09:44:33 -0400 | [diff] [blame] | 185 | dev_err(&pdev->dev, "No platform data!\n"); |
Christoph Fritz | 98652ef | 2010-04-17 13:57:17 +0200 | [diff] [blame] | 186 | return -EINVAL; |
| 187 | } |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 188 | |
| 189 | data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL); |
| 190 | if (data == NULL) |
| 191 | return -ENOMEM; |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 192 | strncpy(data->name, res->name, MFD_NAME_SIZE - 1); |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 193 | dev_set_drvdata(&pdev->dev, data); |
| 194 | data->chip = chip; |
| 195 | data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; |
| 196 | data->iset = pdata->iset; |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 197 | data->port = pdata->flags; |
Christoph Fritz | 98652ef | 2010-04-17 13:57:17 +0200 | [diff] [blame] | 198 | if (data->port < 0) { |
| 199 | dev_err(&pdev->dev, "check device failed\n"); |
| 200 | kfree(data); |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 201 | return -EINVAL; |
Christoph Fritz | 98652ef | 2010-04-17 13:57:17 +0200 | [diff] [blame] | 202 | } |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 203 | |
| 204 | data->current_brightness = 0; |
| 205 | data->cdev.name = data->name; |
| 206 | data->cdev.brightness_set = pm860x_led_set; |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 207 | mutex_init(&data->lock); |
| 208 | INIT_WORK(&data->work, pm860x_led_work); |
| 209 | |
| 210 | ret = led_classdev_register(chip->dev, &data->cdev); |
| 211 | if (ret < 0) { |
| 212 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); |
| 213 | goto out; |
| 214 | } |
Haojian Zhuang | 3154c34 | 2011-03-07 23:43:10 +0800 | [diff] [blame] | 215 | pm860x_led_set(&data->cdev, 0); |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 216 | return 0; |
| 217 | out: |
| 218 | kfree(data); |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | static int pm860x_led_remove(struct platform_device *pdev) |
| 223 | { |
| 224 | struct pm860x_led *data = platform_get_drvdata(pdev); |
| 225 | |
| 226 | led_classdev_unregister(&data->cdev); |
| 227 | kfree(data); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static struct platform_driver pm860x_led_driver = { |
| 233 | .driver = { |
| 234 | .name = "88pm860x-led", |
| 235 | .owner = THIS_MODULE, |
| 236 | }, |
| 237 | .probe = pm860x_led_probe, |
| 238 | .remove = pm860x_led_remove, |
| 239 | }; |
| 240 | |
Axel Lin | 892a884 | 2012-01-10 15:09:24 -0800 | [diff] [blame] | 241 | module_platform_driver(pm860x_led_driver); |
Haojian Zhuang | 0a2f915 | 2010-01-06 17:10:09 -0500 | [diff] [blame] | 242 | |
| 243 | MODULE_DESCRIPTION("LED driver for Marvell PM860x"); |
| 244 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); |
| 245 | MODULE_LICENSE("GPL"); |
| 246 | MODULE_ALIAS("platform:88pm860x-led"); |