【正文】 ile *, long, struct file_lock **)。}。到目前為止，probe函數(shù)的功能就完成了。當(dāng)用戶打開一個設(shè)備，并調(diào)用其read、write等函數(shù)的時候，就可以通過上面的file_operations來找到相關(guān)的函數(shù)。所以，用戶驅(qū)動程序還需要實現(xiàn)這些函數(shù)，具體實現(xiàn)和相關(guān)的設(shè)備有密切的關(guān)系，這里就不再介紹了。關(guān)于我們所使用的LCD設(shè)備的xxx_probe()函數(shù)的分析可查看文章 ＜＜pxafb驅(qū)動程序分析＞＞下面看我們所使用的LCD設(shè)備的 probe() 函數(shù):// drivers/video/:1271int __init pxafb_probe(struct platform_device *dev)1272{1273 struct pxafb_info *fbi。1274 struct pxafb_mach_info *inf。1275 int ret。12761277 dev_dbg(dev, pxafb_probe\n)。12781279 inf = dev。1280 ret = ENOMEM。1281 fbi = NULL。1282 if (!inf)1283 goto failed。12841285ifdef CONFIG_FB_PXA_PARAMETERS1286 ret = pxafb_parse_options(amp。devdev, g_options)。1287 if (ret lccr0 amp。 LCCR0_INVALID_CONFIG_MASK)1296 dev_warn(amp。devdev, machine LCCR0 setting contains illegal bits: %08x\n,1297 inflccr0 amp。 LCCR0_INVALID_CONFIG_MASK)。1298 if (inflccr3 amp。 LCCR3_INVALID_CONFIG_MASK)1299 dev_warn(amp。devdev, machine LCCR3 setting contains illegal bits: %08x\n,1300 inflccr3 amp。 LCCR3_INVALID_CONFIG_MASK)。1301 if (inflccr0 amp。 LCCR0_DPD amp。amp。1302 ((inflccr0 amp。 LCCR0_PAS) != LCCR0_Pas ||1303 (inflccr0 amp。 LCCR0_SDS) != LCCR0_Sngl ||1304 (inflccr0 amp。 LCCR0_CMS) != LCCR0_Mono))1305 dev_warn(amp。devdev, Double Pixel Data (DPD) mode is only valid in passive mono1306 single panel mode\n)。1307 if ((inflccr0 amp。 LCCR0_PAS) == LCCR0_Act amp。amp。1308 (inflccr0 amp。 LCCR0_SDS) == LCCR0_Dual)1309 dev_warn(amp。devdev, Dual panel only valid in passive mode\n)。1310 if ((inflccr0 amp。 LCCR0_PAS) == LCCR0_Pas amp。amp。1311 (infupper_margin || inflower_margin))1312 dev_warn(amp。devdev, Upper and lower margins must be 0 in passive mode\n)。1313endif13141315 dev_dbg(amp。devdev, got a %dx%dx%d LCD\n,infxres, infyres, infbpp)。1316 if (infxres == 0 || infyres == 0 || infbpp == 0) {1317 dev_err(amp。devdev, Invalid resolution or bit depth\n)。1318 ret = EINVAL。1319 goto failed。1320 }1321 pxafb_backlight_power = infpxafb_backlight_power。1322 pxafb_lcd_power = infpxafb_lcd_power。1323 fbi = pxafb_init_fbinfo(amp。devdev)。1324 if (!fbi) {1325 dev_err(amp。devdev, Failed to initialize framebuffer device\n)。1326 ret = ENOMEM。 // only reason for pxafb_init_fbinfo to fail is kmalloc1327 goto failed。1328 }13291330 /* Initialize video memory */1331 ret = pxafb_map_video_memory(fbi)。1332 if (ret) {1333 dev_err(amp。devdev, Failed to allocate video RAM: %d\n, ret)。1334 ret = ENOMEM。1335 goto failed。1336 }13371338 ret = request_irq(IRQ_LCD, pxafb_handle_irq, SA_INTERRUPT, LCD, fbi)。1339 if (ret) {1340 dev_err(amp。devdev, request_irq failed: %d\n, ret)。1341 ret = EBUSY。1342 goto failed。1343 }13441345 /*1346 * This makes sure that our colour bitfield1347 * descriptors are correctly initialised.1348 */1349 pxafb_check_var(amp。fbi, amp。fbifb)。1350 pxafb_set_par(amp。fbifb)。13511352 platform_set_drvdata(dev, fbi)。13531354 ret = register_framebuffer(amp。fbifb)。1355 if (ret dev, Failed to register framebuffer device: %d\n, ret)。1357 goto failed。1358 }13591360ifdef CONFIG_PM1361 // TODO1362endif13631364ifdef CONFIG_CPU_FREQ1365 fbi = pxafb_freq_transition。1366 fbi = pxafb_freq_policy。1367 cpufreq_register_notifier(amp。fbifreq_transition, CPUFREQ_TRANSITION_NOTIFIER)。1368 cpufreq_register_notifier(amp。fbifreq_policy, CPUFREQ_POLICY_NOTIFIER)。1369endif13701371 /*1372 * Ok, now enable the LCD controller1373 */1374 set_ctrlr_state(fbi, C_ENABLE)。13751376 return 0。13771378failed:1379 platform_set_drvdata(dev, NULL)。1380 kfree(fbi)。1381 return ret。1382}參考文獻(xiàn)：structresource 驅(qū)動程序模型platform Linux對I/O端口資源的管理 Linux對I/O端口資源的管理(ZZ) platform_device和platform_driver linux resource, platform_device和驅(qū)動的關(guān)系