Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * RackMac vu-meter driver
0004  *
0005  * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
0006  *                    <benh@kernel.crashing.org>
0007  *
0008  * Support the CPU-meter LEDs of the Xserve G5
0009  *
0010  * TODO: Implement PWM to do variable intensity and provide userland
0011  * interface for fun. Also, the CPU-meter could be made nicer by being
0012  * a bit less "immediate" but giving instead a more average load over
0013  * time. Patches welcome :-)
0014  */
0015 #undef DEBUG
0016 
0017 #include <linux/types.h>
0018 #include <linux/kernel.h>
0019 #include <linux/slab.h>
0020 #include <linux/device.h>
0021 #include <linux/interrupt.h>
0022 #include <linux/module.h>
0023 #include <linux/pci.h>
0024 #include <linux/dma-mapping.h>
0025 #include <linux/kernel_stat.h>
0026 #include <linux/of_address.h>
0027 #include <linux/of_irq.h>
0028 
0029 #include <asm/io.h>
0030 #include <asm/machdep.h>
0031 #include <asm/pmac_feature.h>
0032 #include <asm/dbdma.h>
0033 #include <asm/macio.h>
0034 #include <asm/keylargo.h>
0035 
0036 /* Number of samples in a sample buffer */
0037 #define SAMPLE_COUNT        256
0038 
0039 /* CPU meter sampling rate in ms */
0040 #define CPU_SAMPLING_RATE   250
0041 
0042 struct rackmeter_dma {
0043     struct dbdma_cmd    cmd[4]          ____cacheline_aligned;
0044     u32         mark            ____cacheline_aligned;
0045     u32         buf1[SAMPLE_COUNT]  ____cacheline_aligned;
0046     u32         buf2[SAMPLE_COUNT]  ____cacheline_aligned;
0047 } ____cacheline_aligned;
0048 
0049 struct rackmeter_cpu {
0050     struct delayed_work sniffer;
0051     struct rackmeter    *rm;
0052     u64         prev_wall;
0053     u64         prev_idle;
0054     int         zero;
0055 } ____cacheline_aligned;
0056 
0057 struct rackmeter {
0058     struct macio_dev        *mdev;
0059     unsigned int            irq;
0060     struct device_node      *i2s;
0061     u8              *ubuf;
0062     struct dbdma_regs __iomem   *dma_regs;
0063     void __iomem            *i2s_regs;
0064     dma_addr_t          dma_buf_p;
0065     struct rackmeter_dma        *dma_buf_v;
0066     int             stale_irq;
0067     struct rackmeter_cpu        cpu[2];
0068     int             paused;
0069     struct mutex            sem;
0070 };
0071 
0072 /* To be set as a tunable */
0073 static int rackmeter_ignore_nice;
0074 
0075 /* This GPIO is whacked by the OS X driver when initializing */
0076 #define RACKMETER_MAGIC_GPIO    0x78
0077 
0078 /* This is copied from cpufreq_ondemand, maybe we should put it in
0079  * a common header somewhere
0080  */
0081 static inline u64 get_cpu_idle_time(unsigned int cpu)
0082 {
0083     struct kernel_cpustat *kcpustat = &kcpustat_cpu(cpu);
0084     u64 retval;
0085 
0086     retval = kcpustat->cpustat[CPUTIME_IDLE] +
0087          kcpustat->cpustat[CPUTIME_IOWAIT];
0088 
0089     if (rackmeter_ignore_nice)
0090         retval += kcpustat_field(kcpustat, CPUTIME_NICE, cpu);
0091 
0092     return retval;
0093 }
0094 
0095 static void rackmeter_setup_i2s(struct rackmeter *rm)
0096 {
0097     struct macio_chip *macio = rm->mdev->bus->chip;
0098 
0099     /* First whack magic GPIO */
0100     pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5);
0101 
0102 
0103     /* Call feature code to enable the sound channel and the proper
0104      * clock sources
0105      */
0106     pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1);
0107 
0108     /* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now.
0109      * This is a bit racy, thus we should add new platform functions to
0110      * handle that. snd-aoa needs that too
0111      */
0112     MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
0113     MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
0114     (void)MACIO_IN32(KEYLARGO_FCR1);
0115     udelay(10);
0116 
0117     /* Then setup i2s. For now, we use the same magic value that
0118      * the OS X driver seems to use. We might want to play around
0119      * with the clock divisors later
0120      */
0121     out_le32(rm->i2s_regs + 0x10, 0x01fa0000);
0122     (void)in_le32(rm->i2s_regs + 0x10);
0123     udelay(10);
0124 
0125     /* Fully restart i2s*/
0126     MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE |
0127           KL1_I2S0_CLK_ENABLE_BIT);
0128     (void)MACIO_IN32(KEYLARGO_FCR1);
0129     udelay(10);
0130 }
0131 
0132 static void rackmeter_set_default_pattern(struct rackmeter *rm)
0133 {
0134     int i;
0135 
0136     for (i = 0; i < 16; i++) {
0137         if (i < 8)
0138             rm->ubuf[i] = (i & 1) * 255;
0139         else
0140             rm->ubuf[i] = ((~i) & 1) * 255;
0141     }
0142 }
0143 
0144 static void rackmeter_do_pause(struct rackmeter *rm, int pause)
0145 {
0146     struct rackmeter_dma *rdma = rm->dma_buf_v;
0147 
0148     pr_debug("rackmeter: %s\n", pause ? "paused" : "started");
0149 
0150     rm->paused = pause;
0151     if (pause) {
0152         DBDMA_DO_STOP(rm->dma_regs);
0153         return;
0154     }
0155     memset(rdma->buf1, 0, sizeof(rdma->buf1));
0156     memset(rdma->buf2, 0, sizeof(rdma->buf2));
0157 
0158     rm->dma_buf_v->mark = 0;
0159 
0160     mb();
0161     out_le32(&rm->dma_regs->cmdptr_hi, 0);
0162     out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p);
0163     out_le32(&rm->dma_regs->control, (RUN << 16) | RUN);
0164 }
0165 
0166 static void rackmeter_setup_dbdma(struct rackmeter *rm)
0167 {
0168     struct rackmeter_dma *db = rm->dma_buf_v;
0169     struct dbdma_cmd *cmd = db->cmd;
0170 
0171     /* Make sure dbdma is reset */
0172     DBDMA_DO_RESET(rm->dma_regs);
0173 
0174     pr_debug("rackmeter: mark offset=0x%zx\n",
0175          offsetof(struct rackmeter_dma, mark));
0176     pr_debug("rackmeter: buf1 offset=0x%zx\n",
0177          offsetof(struct rackmeter_dma, buf1));
0178     pr_debug("rackmeter: buf2 offset=0x%zx\n",
0179          offsetof(struct rackmeter_dma, buf2));
0180 
0181     /* Prepare 4 dbdma commands for the 2 buffers */
0182     memset(cmd, 0, 4 * sizeof(struct dbdma_cmd));
0183     cmd->req_count = cpu_to_le16(4);
0184     cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
0185     cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
0186         offsetof(struct rackmeter_dma, mark));
0187     cmd->cmd_dep = cpu_to_le32(0x02000000);
0188     cmd++;
0189 
0190     cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4);
0191     cmd->command = cpu_to_le16(OUTPUT_MORE);
0192     cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
0193         offsetof(struct rackmeter_dma, buf1));
0194     cmd++;
0195 
0196     cmd->req_count = cpu_to_le16(4);
0197     cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
0198     cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
0199         offsetof(struct rackmeter_dma, mark));
0200     cmd->cmd_dep = cpu_to_le32(0x01000000);
0201     cmd++;
0202 
0203     cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4);
0204     cmd->command = cpu_to_le16(OUTPUT_MORE | BR_ALWAYS);
0205     cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
0206         offsetof(struct rackmeter_dma, buf2));
0207     cmd->cmd_dep = cpu_to_le32(rm->dma_buf_p);
0208 
0209     rackmeter_do_pause(rm, 0);
0210 }
0211 
0212 static void rackmeter_do_timer(struct work_struct *work)
0213 {
0214     struct rackmeter_cpu *rcpu =
0215         container_of(work, struct rackmeter_cpu, sniffer.work);
0216     struct rackmeter *rm = rcpu->rm;
0217     unsigned int cpu = smp_processor_id();
0218     u64 cur_nsecs, total_idle_nsecs;
0219     u64 total_nsecs, idle_nsecs;
0220     int i, offset, load, cumm, pause;
0221 
0222     cur_nsecs = jiffies64_to_nsecs(get_jiffies_64());
0223     total_nsecs = cur_nsecs - rcpu->prev_wall;
0224     rcpu->prev_wall = cur_nsecs;
0225 
0226     total_idle_nsecs = get_cpu_idle_time(cpu);
0227     idle_nsecs = total_idle_nsecs - rcpu->prev_idle;
0228     idle_nsecs = min(idle_nsecs, total_nsecs);
0229     rcpu->prev_idle = total_idle_nsecs;
0230 
0231     /* We do a very dumb calculation to update the LEDs for now,
0232      * we'll do better once we have actual PWM implemented
0233      */
0234     load = div64_u64(9 * (total_nsecs - idle_nsecs), total_nsecs);
0235 
0236     offset = cpu << 3;
0237     cumm = 0;
0238     for (i = 0; i < 8; i++) {
0239         u8 ub = (load > i) ? 0xff : 0;
0240         rm->ubuf[i + offset] = ub;
0241         cumm |= ub;
0242     }
0243     rcpu->zero = (cumm == 0);
0244 
0245     /* Now check if LEDs are all 0, we can stop DMA */
0246     pause = (rm->cpu[0].zero && rm->cpu[1].zero);
0247     if (pause != rm->paused) {
0248         mutex_lock(&rm->sem);
0249         pause = (rm->cpu[0].zero && rm->cpu[1].zero);
0250         rackmeter_do_pause(rm, pause);
0251         mutex_unlock(&rm->sem);
0252     }
0253     schedule_delayed_work_on(cpu, &rcpu->sniffer,
0254                  msecs_to_jiffies(CPU_SAMPLING_RATE));
0255 }
0256 
0257 static void rackmeter_init_cpu_sniffer(struct rackmeter *rm)
0258 {
0259     unsigned int cpu;
0260 
0261     /* This driver works only with 1 or 2 CPUs numbered 0 and 1,
0262      * but that's really all we have on Apple Xserve. It doesn't
0263      * play very nice with CPU hotplug neither but we don't do that
0264      * on those machines yet
0265      */
0266 
0267     rm->cpu[0].rm = rm;
0268     INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer);
0269     rm->cpu[1].rm = rm;
0270     INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer);
0271 
0272     for_each_online_cpu(cpu) {
0273         struct rackmeter_cpu *rcpu;
0274 
0275         if (cpu > 1)
0276             continue;
0277         rcpu = &rm->cpu[cpu];
0278         rcpu->prev_idle = get_cpu_idle_time(cpu);
0279         rcpu->prev_wall = jiffies64_to_nsecs(get_jiffies_64());
0280         schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer,
0281                      msecs_to_jiffies(CPU_SAMPLING_RATE));
0282     }
0283 }
0284 
0285 static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm)
0286 {
0287     cancel_delayed_work_sync(&rm->cpu[0].sniffer);
0288     cancel_delayed_work_sync(&rm->cpu[1].sniffer);
0289 }
0290 
0291 static int rackmeter_setup(struct rackmeter *rm)
0292 {
0293     pr_debug("rackmeter: setting up i2s..\n");
0294     rackmeter_setup_i2s(rm);
0295 
0296     pr_debug("rackmeter: setting up default pattern..\n");
0297     rackmeter_set_default_pattern(rm);
0298 
0299     pr_debug("rackmeter: setting up dbdma..\n");
0300     rackmeter_setup_dbdma(rm);
0301 
0302     pr_debug("rackmeter: start CPU measurements..\n");
0303     rackmeter_init_cpu_sniffer(rm);
0304 
0305     printk(KERN_INFO "RackMeter initialized\n");
0306 
0307     return 0;
0308 }
0309 
0310 /*  XXX FIXME: No PWM yet, this is 0/1 */
0311 static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index)
0312 {
0313     int led;
0314     u32 sample = 0;
0315 
0316     for (led = 0; led < 16; led++) {
0317         sample >>= 1;
0318         sample |= ((rm->ubuf[led] >= 0x80) << 15);
0319     }
0320     return (sample << 17) | (sample >> 15);
0321 }
0322 
0323 static irqreturn_t rackmeter_irq(int irq, void *arg)
0324 {
0325     struct rackmeter *rm = arg;
0326     struct rackmeter_dma *db = rm->dma_buf_v;
0327     unsigned int mark, i;
0328     u32 *buf;
0329 
0330     /* Flush PCI buffers with an MMIO read. Maybe we could actually
0331      * check the status one day ... in case things go wrong, though
0332      * this never happened to me
0333      */
0334     (void)in_le32(&rm->dma_regs->status);
0335 
0336     /* Make sure the CPU gets us in order */
0337     rmb();
0338 
0339     /* Read mark */
0340     mark = db->mark;
0341     if (mark != 1 && mark != 2) {
0342         printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n",
0343                mark);
0344         /* We allow for 3 errors like that (stale DBDMA irqs) */
0345         if (++rm->stale_irq > 3) {
0346             printk(KERN_ERR "rackmeter: Too many errors,"
0347                    " stopping DMA\n");
0348             DBDMA_DO_RESET(rm->dma_regs);
0349         }
0350         return IRQ_HANDLED;
0351     }
0352 
0353     /* Next buffer we need to fill is mark value */
0354     buf = mark == 1 ? db->buf1 : db->buf2;
0355 
0356     /* Fill it now. This routine converts the 8 bits depth sample array
0357      * into the PWM bitmap for each LED.
0358      */
0359     for (i = 0; i < SAMPLE_COUNT; i++)
0360         buf[i] = rackmeter_calc_sample(rm, i);
0361 
0362 
0363     return IRQ_HANDLED;
0364 }
0365 
0366 static int rackmeter_probe(struct macio_dev* mdev,
0367                const struct of_device_id *match)
0368 {
0369     struct device_node *i2s = NULL, *np = NULL;
0370     struct rackmeter *rm = NULL;
0371     struct resource ri2s, rdma;
0372     int rc = -ENODEV;
0373 
0374     pr_debug("rackmeter_probe()\n");
0375 
0376     /* Get i2s-a node */
0377     for_each_child_of_node(mdev->ofdev.dev.of_node, i2s)
0378         if (of_node_name_eq(i2s, "i2s-a"))
0379             break;
0380 
0381     if (i2s == NULL) {
0382         pr_debug("  i2s-a child not found\n");
0383         goto bail;
0384     }
0385     /* Get lightshow or virtual sound */
0386     for_each_child_of_node(i2s, np) {
0387            if (of_node_name_eq(np, "lightshow"))
0388                break;
0389            if (of_node_name_eq(np, "sound") &&
0390            of_get_property(np, "virtual", NULL) != NULL)
0391                break;
0392     }
0393     if (np == NULL) {
0394         pr_debug("  lightshow or sound+virtual child not found\n");
0395         goto bail;
0396     }
0397 
0398     /* Create and initialize our instance data */
0399     rm = kzalloc(sizeof(*rm), GFP_KERNEL);
0400     if (rm == NULL) {
0401         printk(KERN_ERR "rackmeter: failed to allocate memory !\n");
0402         rc = -ENOMEM;
0403         goto bail_release;
0404     }
0405     rm->mdev = mdev;
0406     rm->i2s = i2s;
0407     mutex_init(&rm->sem);
0408     dev_set_drvdata(&mdev->ofdev.dev, rm);
0409     /* Check resources availability. We need at least resource 0 and 1 */
0410 #if 0 /* Use that when i2s-a is finally an mdev per-se */
0411     if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) {
0412         printk(KERN_ERR
0413                "rackmeter: found match but lacks resources: %pOF"
0414                " (%d resources, %d interrupts)\n",
0415                mdev->ofdev.dev.of_node);
0416         rc = -ENXIO;
0417         goto bail_free;
0418     }
0419     if (macio_request_resources(mdev, "rackmeter")) {
0420         printk(KERN_ERR
0421                "rackmeter: failed to request resources: %pOF\n",
0422                mdev->ofdev.dev.of_node);
0423         rc = -EBUSY;
0424         goto bail_free;
0425     }
0426     rm->irq = macio_irq(mdev, 1);
0427 #else
0428     rm->irq = irq_of_parse_and_map(i2s, 1);
0429     if (!rm->irq ||
0430         of_address_to_resource(i2s, 0, &ri2s) ||
0431         of_address_to_resource(i2s, 1, &rdma)) {
0432         printk(KERN_ERR
0433                "rackmeter: found match but lacks resources: %pOF",
0434                mdev->ofdev.dev.of_node);
0435         rc = -ENXIO;
0436         goto bail_free;
0437     }
0438 #endif
0439 
0440     pr_debug("  i2s @0x%08x\n", (unsigned int)ri2s.start);
0441     pr_debug("  dma @0x%08x\n", (unsigned int)rdma.start);
0442     pr_debug("  irq %d\n", rm->irq);
0443 
0444     rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL);
0445     if (rm->ubuf == NULL) {
0446         printk(KERN_ERR
0447                "rackmeter: failed to allocate samples page !\n");
0448         rc = -ENOMEM;
0449         goto bail_release;
0450     }
0451 
0452     rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev,
0453                        sizeof(struct rackmeter_dma),
0454                        &rm->dma_buf_p, GFP_KERNEL);
0455     if (rm->dma_buf_v == NULL) {
0456         printk(KERN_ERR
0457                "rackmeter: failed to allocate dma buffer !\n");
0458         rc = -ENOMEM;
0459         goto bail_free_samples;
0460     }
0461 #if 0
0462     rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000);
0463 #else
0464     rm->i2s_regs = ioremap(ri2s.start, 0x1000);
0465 #endif
0466     if (rm->i2s_regs == NULL) {
0467         printk(KERN_ERR
0468                "rackmeter: failed to map i2s registers !\n");
0469         rc = -ENXIO;
0470         goto bail_free_dma;
0471     }
0472 #if 0
0473     rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100);
0474 #else
0475     rm->dma_regs = ioremap(rdma.start, 0x100);
0476 #endif
0477     if (rm->dma_regs == NULL) {
0478         printk(KERN_ERR
0479                "rackmeter: failed to map dma registers !\n");
0480         rc = -ENXIO;
0481         goto bail_unmap_i2s;
0482     }
0483 
0484     rc = rackmeter_setup(rm);
0485     if (rc) {
0486         printk(KERN_ERR
0487                "rackmeter: failed to initialize !\n");
0488         rc = -ENXIO;
0489         goto bail_unmap_dma;
0490     }
0491 
0492     rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm);
0493     if (rc != 0) {
0494         printk(KERN_ERR
0495                "rackmeter: failed to request interrupt !\n");
0496         goto bail_stop_dma;
0497     }
0498     of_node_put(np);
0499     return 0;
0500 
0501  bail_stop_dma:
0502     DBDMA_DO_RESET(rm->dma_regs);
0503  bail_unmap_dma:
0504     iounmap(rm->dma_regs);
0505  bail_unmap_i2s:
0506     iounmap(rm->i2s_regs);
0507  bail_free_dma:
0508     dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
0509               sizeof(struct rackmeter_dma),
0510               rm->dma_buf_v, rm->dma_buf_p);
0511  bail_free_samples:
0512     free_page((unsigned long)rm->ubuf);
0513  bail_release:
0514 #if 0
0515     macio_release_resources(mdev);
0516 #endif
0517  bail_free:
0518     kfree(rm);
0519  bail:
0520     of_node_put(i2s);
0521     of_node_put(np);
0522     dev_set_drvdata(&mdev->ofdev.dev, NULL);
0523     return rc;
0524 }
0525 
0526 static int rackmeter_remove(struct macio_dev* mdev)
0527 {
0528     struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
0529 
0530     /* Stop CPU sniffer timer & work queues */
0531     rackmeter_stop_cpu_sniffer(rm);
0532 
0533     /* Clear reference to private data */
0534     dev_set_drvdata(&mdev->ofdev.dev, NULL);
0535 
0536     /* Stop/reset dbdma */
0537     DBDMA_DO_RESET(rm->dma_regs);
0538 
0539     /* Release the IRQ */
0540     free_irq(rm->irq, rm);
0541 
0542     /* Unmap registers */
0543     iounmap(rm->dma_regs);
0544     iounmap(rm->i2s_regs);
0545 
0546     /* Free DMA */
0547     dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
0548               sizeof(struct rackmeter_dma),
0549               rm->dma_buf_v, rm->dma_buf_p);
0550 
0551     /* Free samples */
0552     free_page((unsigned long)rm->ubuf);
0553 
0554 #if 0
0555     /* Release resources */
0556     macio_release_resources(mdev);
0557 #endif
0558 
0559     /* Get rid of me */
0560     kfree(rm);
0561 
0562     return 0;
0563 }
0564 
0565 static int rackmeter_shutdown(struct macio_dev* mdev)
0566 {
0567     struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
0568 
0569     if (rm == NULL)
0570         return -ENODEV;
0571 
0572     /* Stop CPU sniffer timer & work queues */
0573     rackmeter_stop_cpu_sniffer(rm);
0574 
0575     /* Stop/reset dbdma */
0576     DBDMA_DO_RESET(rm->dma_regs);
0577 
0578     return 0;
0579 }
0580 
0581 static const struct of_device_id rackmeter_match[] = {
0582     { .name = "i2s" },
0583     { }
0584 };
0585 MODULE_DEVICE_TABLE(of, rackmeter_match);
0586 
0587 static struct macio_driver rackmeter_driver = {
0588     .driver = {
0589         .name = "rackmeter",
0590         .owner = THIS_MODULE,
0591         .of_match_table = rackmeter_match,
0592     },
0593     .probe = rackmeter_probe,
0594     .remove = rackmeter_remove,
0595     .shutdown = rackmeter_shutdown,
0596 };
0597 
0598 
0599 static int __init rackmeter_init(void)
0600 {
0601     pr_debug("rackmeter_init()\n");
0602 
0603     return macio_register_driver(&rackmeter_driver);
0604 }
0605 
0606 static void __exit rackmeter_exit(void)
0607 {
0608     pr_debug("rackmeter_exit()\n");
0609 
0610     macio_unregister_driver(&rackmeter_driver);
0611 }
0612 
0613 module_init(rackmeter_init);
0614 module_exit(rackmeter_exit);
0615 
0616 
0617 MODULE_LICENSE("GPL");
0618 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
0619 MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel");
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!