Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 1 | /* include/asm/mach-msm/leds-cpld.c |
| 2 | * |
| 3 | * Copyright (C) 2008 HTC Corporation. |
| 4 | * |
| 5 | * Author: Farmer Tseng |
| 6 | * |
| 7 | * This software is licensed under the terms of the GNU General Public |
| 8 | * License version 2, as published by the Free Software Foundation, and |
| 9 | * may be copied, distributed, and modified under those terms. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/device.h> |
| 22 | #include <linux/leds.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/ctype.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/io.h> |
| 27 | #include <asm/mach-types.h> |
| 28 | |
| 29 | #define DEBUG_LED_CHANGE 0 |
| 30 | |
| 31 | static int _g_cpld_led_addr; |
| 32 | |
| 33 | struct CPLD_LED_data { |
| 34 | spinlock_t data_lock; |
| 35 | struct led_classdev leds[4]; /* blue, green, red */ |
| 36 | }; |
| 37 | |
| 38 | static ssize_t led_blink_solid_show(struct device *dev, |
| 39 | struct device_attribute *attr, char *buf) |
| 40 | { |
| 41 | struct CPLD_LED_data *CPLD_LED; |
| 42 | int idx = 2; |
| 43 | uint8_t reg_val; |
| 44 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 45 | ssize_t ret = 0; |
| 46 | |
| 47 | if (!strcmp(led_cdev->name, "red")) |
| 48 | idx = 0; |
| 49 | else if (!strcmp(led_cdev->name, "green")) |
| 50 | idx = 1; |
| 51 | else |
| 52 | idx = 2; |
| 53 | |
| 54 | CPLD_LED = container_of(led_cdev, struct CPLD_LED_data, leds[idx]); |
| 55 | |
| 56 | spin_lock(&CPLD_LED->data_lock); |
| 57 | reg_val = readb(_g_cpld_led_addr); |
| 58 | reg_val = reg_val >> (2 * idx + 1); |
| 59 | reg_val &= 0x1; |
| 60 | spin_unlock(&CPLD_LED->data_lock); |
| 61 | |
| 62 | /* no lock needed for this */ |
| 63 | sprintf(buf, "%u\n", reg_val); |
| 64 | ret = strlen(buf) + 1; |
| 65 | |
| 66 | return ret; |
| 67 | } |
| 68 | |
| 69 | static ssize_t led_blink_solid_store(struct device *dev, |
| 70 | struct device_attribute *attr, |
| 71 | const char *buf, size_t size) |
| 72 | { |
| 73 | struct CPLD_LED_data *CPLD_LED; |
| 74 | int idx = 2; |
| 75 | uint8_t reg_val; |
| 76 | char *after; |
| 77 | unsigned long state; |
| 78 | ssize_t ret = -EINVAL; |
| 79 | size_t count; |
| 80 | |
| 81 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 82 | |
| 83 | if (!strcmp(led_cdev->name, "red")) |
| 84 | idx = 0; |
| 85 | else if (!strcmp(led_cdev->name, "green")) |
| 86 | idx = 1; |
| 87 | else |
| 88 | idx = 2; |
| 89 | |
| 90 | CPLD_LED = container_of(led_cdev, struct CPLD_LED_data, leds[idx]); |
| 91 | |
| 92 | state = simple_strtoul(buf, &after, 10); |
| 93 | |
| 94 | count = after - buf; |
| 95 | |
| 96 | if (*after && isspace(*after)) |
| 97 | count++; |
| 98 | |
| 99 | if (count == size) { |
| 100 | ret = count; |
| 101 | spin_lock(&CPLD_LED->data_lock); |
| 102 | reg_val = readb(_g_cpld_led_addr); |
| 103 | if (state) |
| 104 | reg_val |= 1 << (2 * idx + 1); |
| 105 | else |
| 106 | reg_val &= ~(1 << (2 * idx + 1)); |
| 107 | |
| 108 | writeb(reg_val, _g_cpld_led_addr); |
| 109 | spin_unlock(&CPLD_LED->data_lock); |
| 110 | } |
| 111 | |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | static DEVICE_ATTR(blink, 0644, led_blink_solid_show, led_blink_solid_store); |
| 116 | |
| 117 | static ssize_t cpldled_blink_all_show(struct device *dev, |
| 118 | struct device_attribute *attr, char *buf) |
| 119 | { |
| 120 | uint8_t reg_val; |
| 121 | struct CPLD_LED_data *CPLD_LED = dev_get_drvdata(dev); |
| 122 | ssize_t ret = 0; |
| 123 | |
| 124 | spin_lock(&CPLD_LED->data_lock); |
| 125 | reg_val = readb(_g_cpld_led_addr); |
| 126 | reg_val &= 0x2A; |
| 127 | if (reg_val == 0x2A) |
| 128 | reg_val = 1; |
| 129 | else |
| 130 | reg_val = 0; |
| 131 | spin_unlock(&CPLD_LED->data_lock); |
| 132 | |
| 133 | /* no lock needed for this */ |
| 134 | sprintf(buf, "%u\n", reg_val); |
| 135 | ret = strlen(buf) + 1; |
| 136 | |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | static ssize_t cpldled_blink_all_store(struct device *dev, |
| 141 | struct device_attribute *attr, |
| 142 | const char *buf, size_t size) |
| 143 | { |
| 144 | uint8_t reg_val; |
| 145 | char *after; |
| 146 | unsigned long state; |
| 147 | ssize_t ret = -EINVAL; |
| 148 | size_t count; |
| 149 | struct CPLD_LED_data *CPLD_LED = dev_get_drvdata(dev); |
| 150 | |
| 151 | state = simple_strtoul(buf, &after, 10); |
| 152 | |
| 153 | count = after - buf; |
| 154 | |
| 155 | if (*after && isspace(*after)) |
| 156 | count++; |
| 157 | |
| 158 | if (count == size) { |
| 159 | ret = count; |
| 160 | spin_lock(&CPLD_LED->data_lock); |
| 161 | reg_val = readb(_g_cpld_led_addr); |
| 162 | if (state) |
| 163 | reg_val |= 0x2A; |
| 164 | else |
| 165 | reg_val &= ~0x2A; |
| 166 | |
| 167 | writeb(reg_val, _g_cpld_led_addr); |
| 168 | spin_unlock(&CPLD_LED->data_lock); |
| 169 | } |
| 170 | |
| 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | static struct device_attribute dev_attr_blink_all = { |
| 175 | .attr = { |
| 176 | .name = "blink", |
| 177 | .mode = 0644, |
| 178 | }, |
| 179 | .show = cpldled_blink_all_show, |
| 180 | .store = cpldled_blink_all_store, |
| 181 | }; |
| 182 | |
| 183 | static void led_brightness_set(struct led_classdev *led_cdev, |
| 184 | enum led_brightness brightness) |
| 185 | { |
| 186 | struct CPLD_LED_data *CPLD_LED; |
| 187 | int idx = 2; |
| 188 | struct led_classdev *led; |
| 189 | uint8_t reg_val; |
| 190 | |
| 191 | if (!strcmp(led_cdev->name, "jogball-backlight")) { |
| 192 | if (brightness > 7) |
| 193 | reg_val = 1; |
| 194 | else |
| 195 | reg_val = brightness; |
| 196 | writeb(0, _g_cpld_led_addr + 0x8); |
| 197 | writeb(reg_val, _g_cpld_led_addr + 0x8); |
| 198 | #if DEBUG_LED_CHANGE |
| 199 | printk(KERN_INFO "LED change: jogball backlight = %d \n", |
| 200 | reg_val); |
| 201 | #endif |
| 202 | return; |
| 203 | } else if (!strcmp(led_cdev->name, "red")) { |
| 204 | idx = 0; |
| 205 | } else if (!strcmp(led_cdev->name, "green")) { |
| 206 | idx = 1; |
| 207 | } else { |
| 208 | idx = 2; |
| 209 | } |
| 210 | |
| 211 | CPLD_LED = container_of(led_cdev, struct CPLD_LED_data, leds[idx]); |
| 212 | spin_lock(&CPLD_LED->data_lock); |
| 213 | reg_val = readb(_g_cpld_led_addr); |
| 214 | led = &CPLD_LED->leds[idx]; |
| 215 | |
| 216 | if (led->brightness > LED_OFF) |
| 217 | reg_val |= 1 << (2 * idx); |
| 218 | else |
| 219 | reg_val &= ~(1 << (2 * idx)); |
| 220 | |
| 221 | writeb(reg_val, _g_cpld_led_addr); |
| 222 | #if DEBUG_LED_CHANGE |
| 223 | printk(KERN_INFO "LED change: %s = %d \n", led_cdev->name, led->brightness); |
| 224 | #endif |
| 225 | spin_unlock(&CPLD_LED->data_lock); |
| 226 | } |
| 227 | |
| 228 | static ssize_t cpldled_grpfreq_show(struct device *dev, |
| 229 | struct device_attribute *attr, char *buf) |
| 230 | { |
| 231 | return sprintf(buf, "%u\n", 0); |
| 232 | } |
| 233 | |
| 234 | static ssize_t cpldled_grpfreq_store(struct device *dev, |
| 235 | struct device_attribute *attr, |
| 236 | const char *buf, size_t count) |
| 237 | { |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static DEVICE_ATTR(grpfreq, 0644, cpldled_grpfreq_show, cpldled_grpfreq_store); |
| 242 | |
| 243 | static ssize_t cpldled_grppwm_show(struct device *dev, |
| 244 | struct device_attribute *attr, char *buf) |
| 245 | { |
| 246 | return sprintf(buf, "%u\n", 0); |
| 247 | } |
| 248 | |
| 249 | static ssize_t cpldled_grppwm_store(struct device *dev, |
| 250 | struct device_attribute *attr, |
| 251 | const char *buf, size_t count) |
| 252 | { |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static DEVICE_ATTR(grppwm, 0644, cpldled_grppwm_show, cpldled_grppwm_store); |
| 257 | |
| 258 | static int CPLD_LED_probe(struct platform_device *pdev) |
| 259 | { |
| 260 | int ret = 0; |
| 261 | int i, j; |
| 262 | struct resource *res; |
| 263 | struct CPLD_LED_data *CPLD_LED; |
| 264 | |
| 265 | CPLD_LED = kzalloc(sizeof(struct CPLD_LED_data), GFP_KERNEL); |
| 266 | if (CPLD_LED == NULL) { |
| 267 | printk(KERN_ERR "CPLD_LED_probe: no memory for device\n"); |
| 268 | ret = -ENOMEM; |
| 269 | goto err_alloc_failed; |
| 270 | } |
| 271 | |
| 272 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 273 | if (!res) { |
| 274 | ret = -ENOMEM; |
| 275 | goto err_alloc_failed; |
| 276 | } |
| 277 | |
| 278 | _g_cpld_led_addr = res->start; |
| 279 | if (!_g_cpld_led_addr) { |
| 280 | ret = -ENOMEM; |
| 281 | goto err_alloc_failed; |
| 282 | } |
| 283 | |
| 284 | memset(CPLD_LED, 0, sizeof(struct CPLD_LED_data)); |
| 285 | writeb(0x00, _g_cpld_led_addr); |
| 286 | |
| 287 | CPLD_LED->leds[0].name = "red"; |
| 288 | CPLD_LED->leds[0].brightness_set = led_brightness_set; |
| 289 | |
| 290 | CPLD_LED->leds[1].name = "green"; |
| 291 | CPLD_LED->leds[1].brightness_set = led_brightness_set; |
| 292 | |
| 293 | CPLD_LED->leds[2].name = "blue"; |
| 294 | CPLD_LED->leds[2].brightness_set = led_brightness_set; |
| 295 | |
| 296 | CPLD_LED->leds[3].name = "jogball-backlight"; |
| 297 | CPLD_LED->leds[3].brightness_set = led_brightness_set; |
| 298 | |
| 299 | spin_lock_init(&CPLD_LED->data_lock); |
| 300 | |
| 301 | for (i = 0; i < 4; i++) { /* red, green, blue jogball */ |
| 302 | ret = led_classdev_register(&pdev->dev, &CPLD_LED->leds[i]); |
| 303 | if (ret) { |
| 304 | printk(KERN_ERR |
| 305 | "CPLD_LED: led_classdev_register failed\n"); |
| 306 | goto err_led_classdev_register_failed; |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | for (i = 0; i < 3; i++) { |
| 311 | ret = |
| 312 | device_create_file(CPLD_LED->leds[i].dev, &dev_attr_blink); |
| 313 | if (ret) { |
| 314 | printk(KERN_ERR |
| 315 | "CPLD_LED: device_create_file failed\n"); |
| 316 | goto err_out_attr_blink; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | dev_set_drvdata(&pdev->dev, CPLD_LED); |
| 321 | ret = device_create_file(&pdev->dev, &dev_attr_blink_all); |
| 322 | if (ret) { |
| 323 | printk(KERN_ERR |
| 324 | "CPLD_LED: create dev_attr_blink_all failed\n"); |
| 325 | goto err_out_attr_blink; |
| 326 | } |
| 327 | ret = device_create_file(&pdev->dev, &dev_attr_grppwm); |
| 328 | if (ret) { |
| 329 | printk(KERN_ERR |
| 330 | "CPLD_LED: create dev_attr_grppwm failed\n"); |
| 331 | goto err_out_attr_grppwm; |
| 332 | } |
| 333 | ret = device_create_file(&pdev->dev, &dev_attr_grpfreq); |
| 334 | if (ret) { |
| 335 | printk(KERN_ERR |
| 336 | "CPLD_LED: create dev_attr_grpfreq failed\n"); |
| 337 | goto err_out_attr_grpfreq; |
| 338 | } |
| 339 | |
| 340 | return 0; |
| 341 | |
| 342 | err_out_attr_grpfreq: |
| 343 | device_remove_file(&pdev->dev, &dev_attr_grppwm); |
| 344 | err_out_attr_grppwm: |
| 345 | device_remove_file(&pdev->dev, &dev_attr_blink_all); |
| 346 | err_out_attr_blink: |
| 347 | for (j = 0; j < i; j++) |
| 348 | device_remove_file(CPLD_LED->leds[j].dev, &dev_attr_blink); |
| 349 | i = 3; |
| 350 | |
| 351 | err_led_classdev_register_failed: |
| 352 | for (j = 0; j < i; j++) |
| 353 | led_classdev_unregister(&CPLD_LED->leds[j]); |
| 354 | |
| 355 | err_alloc_failed: |
| 356 | kfree(CPLD_LED); |
| 357 | |
| 358 | return ret; |
| 359 | } |
| 360 | |
| 361 | static int __devexit CPLD_LED_remove(struct platform_device *pdev) |
| 362 | { |
| 363 | struct CPLD_LED_data *CPLD_LED; |
| 364 | int i; |
| 365 | |
| 366 | CPLD_LED = platform_get_drvdata(pdev); |
| 367 | |
| 368 | for (i = 0; i < 3; i++) { |
| 369 | device_remove_file(CPLD_LED->leds[i].dev, &dev_attr_blink); |
| 370 | led_classdev_unregister(&CPLD_LED->leds[i]); |
| 371 | } |
| 372 | |
| 373 | device_remove_file(&pdev->dev, &dev_attr_blink_all); |
| 374 | device_remove_file(&pdev->dev, &dev_attr_grppwm); |
| 375 | device_remove_file(&pdev->dev, &dev_attr_grpfreq); |
| 376 | |
| 377 | kfree(CPLD_LED); |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static struct platform_driver CPLD_LED_driver = { |
| 382 | .probe = CPLD_LED_probe, |
| 383 | .remove = __devexit_p(CPLD_LED_remove), |
| 384 | .driver = { |
| 385 | .name = "leds-cpld", |
| 386 | .owner = THIS_MODULE, |
| 387 | }, |
| 388 | }; |
| 389 | |
| 390 | static int __init CPLD_LED_init(void) |
| 391 | { |
| 392 | return platform_driver_register(&CPLD_LED_driver); |
| 393 | } |
| 394 | |
| 395 | static void __exit CPLD_LED_exit(void) |
| 396 | { |
| 397 | platform_driver_unregister(&CPLD_LED_driver); |
| 398 | } |
| 399 | |
| 400 | MODULE_AUTHOR("Farmer Tseng"); |
| 401 | MODULE_DESCRIPTION("CPLD_LED driver"); |
| 402 | MODULE_LICENSE("GPL"); |
| 403 | |
| 404 | module_init(CPLD_LED_init); |
| 405 | module_exit(CPLD_LED_exit); |