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Date: Wed, 23 Oct 2019 17:22:22 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
Helge Deller <deller@....de>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Al Viro <viro@...iv.linux.org.uk>,
linux-parisc@...r.kernel.org, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: hp_sdc_rtc - remove dead chardev code
On 23/10/2019 16:25:02+0200, Arnd Bergmann wrote:
> The driver contains half of the implementation of /dev/rtc, but this
> was never completed, and it is now incompatible with the drivers/rtc
> framework.
>
> Remove the chardev completely. If anyone wants to add the functionality
> later, that shoudl be done through rtc_register_device().
>
> The remaining portions of the driver basically implement a single
> procfs file that may or may not be used anywhere. Not sure why this
> is in drivers/input/ though.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---
> drivers/input/misc/hp_sdc_rtc.c | 342 --------------------------------
> 1 file changed, 342 deletions(-)
>
> diff --git a/drivers/input/misc/hp_sdc_rtc.c b/drivers/input/misc/hp_sdc_rtc.c
> index abca895a6156..199bc17ddb1d 100644
> --- a/drivers/input/misc/hp_sdc_rtc.c
> +++ b/drivers/input/misc/hp_sdc_rtc.c
> @@ -53,28 +53,10 @@ MODULE_LICENSE("Dual BSD/GPL");
>
> #define RTC_VERSION "1.10d"
>
> -static DEFINE_MUTEX(hp_sdc_rtc_mutex);
> static unsigned long epoch = 2000;
>
> static struct semaphore i8042tregs;
>
> -static hp_sdc_irqhook hp_sdc_rtc_isr;
> -
> -static struct fasync_struct *hp_sdc_rtc_async_queue;
> -
> -static DECLARE_WAIT_QUEUE_HEAD(hp_sdc_rtc_wait);
> -
> -static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
> - size_t count, loff_t *ppos);
> -
> -static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
> - unsigned int cmd, unsigned long arg);
> -
> -static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait);
> -
> -static int hp_sdc_rtc_open(struct inode *inode, struct file *file);
> -static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on);
> -
> static void hp_sdc_rtc_isr (int irq, void *dev_id,
> uint8_t status, uint8_t data)
> {
> @@ -283,151 +265,6 @@ static inline int hp_sdc_rtc_read_ct(struct timespec64 *res) {
> return 0;
> }
>
> -
> -#if 0 /* not used yet */
> -/* Set the i8042 real-time clock */
> -static int hp_sdc_rtc_set_rt (struct timeval *setto)
> -{
> - uint32_t tenms;
> - unsigned int days;
> - hp_sdc_transaction t;
> - uint8_t tseq[11] = {
> - HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
> - HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0,
> - HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
> - HP_SDC_CMD_SET_RTD, 2, 0, 0
> - };
> -
> - t.endidx = 10;
> -
> - if (0xffff < setto->tv_sec / 86400) return -1;
> - days = setto->tv_sec / 86400;
> - if (0xffff < setto->tv_usec / 1000000 / 86400) return -1;
> - days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400;
> - if (days > 0xffff) return -1;
> -
> - if (0xffffff < setto->tv_sec) return -1;
> - tenms = setto->tv_sec * 100;
> - if (0xffffff < setto->tv_usec / 10000) return -1;
> - tenms += setto->tv_usec / 10000;
> - if (tenms > 0xffffff) return -1;
> -
> - tseq[3] = (uint8_t)(tenms & 0xff);
> - tseq[4] = (uint8_t)((tenms >> 8) & 0xff);
> - tseq[5] = (uint8_t)((tenms >> 16) & 0xff);
> -
> - tseq[9] = (uint8_t)(days & 0xff);
> - tseq[10] = (uint8_t)((days >> 8) & 0xff);
> -
> - t.seq = tseq;
> -
> - if (hp_sdc_enqueue_transaction(&t)) return -1;
> - return 0;
> -}
> -
> -/* Set the i8042 fast handshake timer */
> -static int hp_sdc_rtc_set_fhs (struct timeval *setto)
> -{
> - uint32_t tenms;
> - hp_sdc_transaction t;
> - uint8_t tseq[5] = {
> - HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
> - HP_SDC_CMD_SET_FHS, 2, 0, 0
> - };
> -
> - t.endidx = 4;
> -
> - if (0xffff < setto->tv_sec) return -1;
> - tenms = setto->tv_sec * 100;
> - if (0xffff < setto->tv_usec / 10000) return -1;
> - tenms += setto->tv_usec / 10000;
> - if (tenms > 0xffff) return -1;
> -
> - tseq[3] = (uint8_t)(tenms & 0xff);
> - tseq[4] = (uint8_t)((tenms >> 8) & 0xff);
> -
> - t.seq = tseq;
> -
> - if (hp_sdc_enqueue_transaction(&t)) return -1;
> - return 0;
> -}
> -
> -
> -/* Set the i8042 match timer (a.k.a. alarm) */
> -#define hp_sdc_rtc_set_mt (setto) \
> - hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT)
> -
> -/* Set the i8042 delay timer */
> -#define hp_sdc_rtc_set_dt (setto) \
> - hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT)
> -
> -/* Set the i8042 cycle timer (a.k.a. periodic) */
> -#define hp_sdc_rtc_set_ct (setto) \
> - hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT)
> -
> -/* Set one of the i8042 3-byte wide timers */
> -static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
> -{
> - uint32_t tenms;
> - hp_sdc_transaction t;
> - uint8_t tseq[6] = {
> - HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
> - 0, 3, 0, 0, 0
> - };
> -
> - t.endidx = 6;
> -
> - if (0xffffff < setto->tv_sec) return -1;
> - tenms = setto->tv_sec * 100;
> - if (0xffffff < setto->tv_usec / 10000) return -1;
> - tenms += setto->tv_usec / 10000;
> - if (tenms > 0xffffff) return -1;
> -
> - tseq[1] = setcmd;
> - tseq[3] = (uint8_t)(tenms & 0xff);
> - tseq[4] = (uint8_t)((tenms >> 8) & 0xff);
> - tseq[5] = (uint8_t)((tenms >> 16) & 0xff);
> -
> - t.seq = tseq;
> -
> - if (hp_sdc_enqueue_transaction(&t)) {
> - return -1;
> - }
> - return 0;
> -}
> -#endif
> -
> -static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
> - size_t count, loff_t *ppos) {
> - ssize_t retval;
> -
> - if (count < sizeof(unsigned long))
> - return -EINVAL;
> -
> - retval = put_user(68, (unsigned long __user *)buf);
> - return retval;
> -}
> -
> -static __poll_t hp_sdc_rtc_poll(struct file *file, poll_table *wait)
> -{
> - unsigned long l;
> -
> - l = 0;
> - if (l != 0)
> - return EPOLLIN | EPOLLRDNORM;
> - return 0;
> -}
> -
> -static int hp_sdc_rtc_open(struct inode *inode, struct file *file)
> -{
> - return 0;
> -}
> -
> -static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
> -{
> - return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
> -}
> -
> static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
> {
> #define YN(bit) ("no")
> @@ -507,182 +344,6 @@ static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
> #undef NY
> }
>
> -static int hp_sdc_rtc_ioctl(struct file *file,
> - unsigned int cmd, unsigned long arg)
> -{
> -#if 1
> - return -EINVAL;
> -#else
> -
> - struct rtc_time wtime;
> - struct timeval ttime;
> - int use_wtime = 0;
> -
> - /* This needs major work. */
> -
> - switch (cmd) {
> -
> - case RTC_AIE_OFF: /* Mask alarm int. enab. bit */
> - case RTC_AIE_ON: /* Allow alarm interrupts. */
> - case RTC_PIE_OFF: /* Mask periodic int. enab. bit */
> - case RTC_PIE_ON: /* Allow periodic ints */
> - case RTC_UIE_ON: /* Allow ints for RTC updates. */
> - case RTC_UIE_OFF: /* Allow ints for RTC updates. */
> - {
> - /* We cannot mask individual user timers and we
> - cannot tell them apart when they occur, so it
> - would be disingenuous to succeed these IOCTLs */
> - return -EINVAL;
> - }
> - case RTC_ALM_READ: /* Read the present alarm time */
> - {
> - if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT;
> - if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
> -
> - wtime.tm_hour = ttime.tv_sec / 3600; ttime.tv_sec %= 3600;
> - wtime.tm_min = ttime.tv_sec / 60; ttime.tv_sec %= 60;
> - wtime.tm_sec = ttime.tv_sec;
> -
> - break;
> - }
> - case RTC_IRQP_READ: /* Read the periodic IRQ rate. */
> - {
> - return put_user(hp_sdc_rtc_freq, (unsigned long *)arg);
> - }
> - case RTC_IRQP_SET: /* Set periodic IRQ rate. */
> - {
> - /*
> - * The max we can do is 100Hz.
> - */
> -
> - if ((arg < 1) || (arg > 100)) return -EINVAL;
> - ttime.tv_sec = 0;
> - ttime.tv_usec = 1000000 / arg;
> - if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT;
> - hp_sdc_rtc_freq = arg;
> - return 0;
> - }
> - case RTC_ALM_SET: /* Store a time into the alarm */
> - {
> - /*
> - * This expects a struct hp_sdc_rtc_time. Writing 0xff means
> - * "don't care" or "match all" for PC timers. The HP SDC
> - * does not support that perk, but it could be emulated fairly
> - * easily. Only the tm_hour, tm_min and tm_sec are used.
> - * We could do it with 10ms accuracy with the HP SDC, if the
> - * rtc interface left us a way to do that.
> - */
> - struct hp_sdc_rtc_time alm_tm;
> -
> - if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg,
> - sizeof(struct hp_sdc_rtc_time)))
> - return -EFAULT;
> -
> - if (alm_tm.tm_hour > 23) return -EINVAL;
> - if (alm_tm.tm_min > 59) return -EINVAL;
> - if (alm_tm.tm_sec > 59) return -EINVAL;
> -
> - ttime.sec = alm_tm.tm_hour * 3600 +
> - alm_tm.tm_min * 60 + alm_tm.tm_sec;
> - ttime.usec = 0;
> - if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT;
> - return 0;
> - }
> - case RTC_RD_TIME: /* Read the time/date from RTC */
> - {
> - if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
> - break;
> - }
> - case RTC_SET_TIME: /* Set the RTC */
> - {
> - struct rtc_time hp_sdc_rtc_tm;
> - unsigned char mon, day, hrs, min, sec, leap_yr;
> - unsigned int yrs;
> -
> - if (!capable(CAP_SYS_TIME))
> - return -EACCES;
> - if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg,
> - sizeof(struct rtc_time)))
> - return -EFAULT;
> -
> - yrs = hp_sdc_rtc_tm.tm_year + 1900;
> - mon = hp_sdc_rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
> - day = hp_sdc_rtc_tm.tm_mday;
> - hrs = hp_sdc_rtc_tm.tm_hour;
> - min = hp_sdc_rtc_tm.tm_min;
> - sec = hp_sdc_rtc_tm.tm_sec;
> -
> - if (yrs < 1970)
> - return -EINVAL;
> -
> - leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
> -
> - if ((mon > 12) || (day == 0))
> - return -EINVAL;
> - if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
> - return -EINVAL;
> - if ((hrs >= 24) || (min >= 60) || (sec >= 60))
> - return -EINVAL;
> -
> - if ((yrs -= eH) > 255) /* They are unsigned */
> - return -EINVAL;
> -
> -
> - return 0;
> - }
> - case RTC_EPOCH_READ: /* Read the epoch. */
> - {
> - return put_user (epoch, (unsigned long *)arg);
> - }
> - case RTC_EPOCH_SET: /* Set the epoch. */
> - {
> - /*
> - * There were no RTC clocks before 1900.
> - */
> - if (arg < 1900)
> - return -EINVAL;
> - if (!capable(CAP_SYS_TIME))
> - return -EACCES;
> -
> - epoch = arg;
> - return 0;
> - }
> - default:
> - return -EINVAL;
> - }
> - return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
> -#endif
> -}
> -
> -static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
> - unsigned int cmd, unsigned long arg)
> -{
> - int ret;
> -
> - mutex_lock(&hp_sdc_rtc_mutex);
> - ret = hp_sdc_rtc_ioctl(file, cmd, arg);
> - mutex_unlock(&hp_sdc_rtc_mutex);
> -
> - return ret;
> -}
> -
> -
> -static const struct file_operations hp_sdc_rtc_fops = {
> - .owner = THIS_MODULE,
> - .llseek = no_llseek,
> - .read = hp_sdc_rtc_read,
> - .poll = hp_sdc_rtc_poll,
> - .unlocked_ioctl = hp_sdc_rtc_unlocked_ioctl,
> - .open = hp_sdc_rtc_open,
> - .fasync = hp_sdc_rtc_fasync,
> -};
> -
> -static struct miscdevice hp_sdc_rtc_dev = {
> - .minor = RTC_MINOR,
> - .name = "rtc_HIL",
> - .fops = &hp_sdc_rtc_fops
> -};
> -
> static int __init hp_sdc_rtc_init(void)
> {
> int ret;
> @@ -696,8 +357,6 @@ static int __init hp_sdc_rtc_init(void)
>
> if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
> return ret;
> - if (misc_register(&hp_sdc_rtc_dev) != 0)
> - printk(KERN_INFO "Could not register misc. dev for i8042 rtc\n");
>
> proc_create_single("driver/rtc", 0, NULL, hp_sdc_rtc_proc_show);
>
> @@ -710,7 +369,6 @@ static int __init hp_sdc_rtc_init(void)
> static void __exit hp_sdc_rtc_exit(void)
> {
> remove_proc_entry ("driver/rtc", NULL);
> - misc_deregister(&hp_sdc_rtc_dev);
> hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
> printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
> }
> --
> 2.20.0
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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