diff options
Diffstat (limited to 'drivers/ptp/ptp_clock.c')
| -rw-r--r-- | drivers/ptp/ptp_clock.c | 92 |
1 files changed, 60 insertions, 32 deletions
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c index 10451a15e82..296b0ec8744 100644 --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -17,7 +17,7 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <linux/bitops.h> +#include <linux/idr.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> @@ -32,7 +32,6 @@ #include "ptp_private.h" #define PTP_MAX_ALARMS 4 -#define PTP_MAX_CLOCKS 8 #define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT) #define PTP_PPS_EVENT PPS_CAPTUREASSERT #define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC) @@ -42,8 +41,7 @@ static dev_t ptp_devt; static struct class *ptp_class; -static DECLARE_BITMAP(ptp_clocks_map, PTP_MAX_CLOCKS); -static DEFINE_MUTEX(ptp_clocks_mutex); /* protects 'ptp_clocks_map' */ +static DEFINE_IDA(ptp_clocks_map); /* time stamp event queue operations */ @@ -143,10 +141,15 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct timex *tx) kt = timespec_to_ktime(ts); delta = ktime_to_ns(kt); err = ops->adjtime(ops, delta); - } else if (tx->modes & ADJ_FREQUENCY) { - - err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq)); + s32 ppb = scaled_ppm_to_ppb(tx->freq); + if (ppb > ops->max_adj || ppb < -ops->max_adj) + return -ERANGE; + err = ops->adjfreq(ops, ppb); + ptp->dialed_frequency = tx->freq; + } else if (tx->modes == 0) { + tx->freq = ptp->dialed_frequency; + err = 0; } return err; @@ -169,18 +172,15 @@ static void delete_ptp_clock(struct posix_clock *pc) struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); mutex_destroy(&ptp->tsevq_mux); - - /* Remove the clock from the bit map. */ - mutex_lock(&ptp_clocks_mutex); - clear_bit(ptp->index, ptp_clocks_map); - mutex_unlock(&ptp_clocks_mutex); - + mutex_destroy(&ptp->pincfg_mux); + ida_simple_remove(&ptp_clocks_map, ptp->index); kfree(ptp); } /* public interface */ -struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info) +struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, + struct device *parent) { struct ptp_clock *ptp; int err = 0, index, major = MAJOR(ptp_devt); @@ -188,21 +188,18 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info) if (info->n_alarm > PTP_MAX_ALARMS) return ERR_PTR(-EINVAL); - /* Find a free clock slot and reserve it. */ - err = -EBUSY; - mutex_lock(&ptp_clocks_mutex); - index = find_first_zero_bit(ptp_clocks_map, PTP_MAX_CLOCKS); - if (index < PTP_MAX_CLOCKS) - set_bit(index, ptp_clocks_map); - else - goto no_slot; - /* Initialize a clock structure. */ err = -ENOMEM; ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL); if (ptp == NULL) goto no_memory; + index = ida_simple_get(&ptp_clocks_map, 0, MINORMASK + 1, GFP_KERNEL); + if (index < 0) { + err = index; + goto no_slot; + } + ptp->clock.ops = ptp_clock_ops; ptp->clock.release = delete_ptp_clock; ptp->info = info; @@ -210,10 +207,11 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info) ptp->index = index; spin_lock_init(&ptp->tsevq.lock); mutex_init(&ptp->tsevq_mux); + mutex_init(&ptp->pincfg_mux); init_waitqueue_head(&ptp->tsev_wq); /* Create a new device in our class. */ - ptp->dev = device_create(ptp_class, NULL, ptp->devid, ptp, + ptp->dev = device_create(ptp_class, parent, ptp->devid, ptp, "ptp%d", ptp->index); if (IS_ERR(ptp->dev)) goto no_device; @@ -245,7 +243,6 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info) goto no_clock; } - mutex_unlock(&ptp_clocks_mutex); return ptp; no_clock: @@ -257,11 +254,10 @@ no_sysfs: device_destroy(ptp_class, ptp->devid); no_device: mutex_destroy(&ptp->tsevq_mux); + mutex_destroy(&ptp->pincfg_mux); +no_slot: kfree(ptp); no_memory: - clear_bit(index, ptp_clocks_map); -no_slot: - mutex_unlock(&ptp_clocks_mutex); return ERR_PTR(err); } EXPORT_SYMBOL(ptp_clock_register); @@ -300,16 +296,48 @@ void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event) pps_get_ts(&evt); pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL); break; + + case PTP_CLOCK_PPSUSR: + pps_event(ptp->pps_source, &event->pps_times, + PTP_PPS_EVENT, NULL); + break; } } EXPORT_SYMBOL(ptp_clock_event); +int ptp_clock_index(struct ptp_clock *ptp) +{ + return ptp->index; +} +EXPORT_SYMBOL(ptp_clock_index); + +int ptp_find_pin(struct ptp_clock *ptp, + enum ptp_pin_function func, unsigned int chan) +{ + struct ptp_pin_desc *pin = NULL; + int i; + + mutex_lock(&ptp->pincfg_mux); + for (i = 0; i < ptp->info->n_pins; i++) { + if (ptp->info->pin_config[i].func == func && + ptp->info->pin_config[i].chan == chan) { + pin = &ptp->info->pin_config[i]; + break; + } + } + mutex_unlock(&ptp->pincfg_mux); + + return pin ? i : -1; +} +EXPORT_SYMBOL(ptp_find_pin); + /* module operations */ static void __exit ptp_exit(void) { class_destroy(ptp_class); - unregister_chrdev_region(ptp_devt, PTP_MAX_CLOCKS); + unregister_chrdev_region(ptp_devt, MINORMASK + 1); + ida_destroy(&ptp_clocks_map); } static int __init ptp_init(void) @@ -322,13 +350,13 @@ static int __init ptp_init(void) return PTR_ERR(ptp_class); } - err = alloc_chrdev_region(&ptp_devt, 0, PTP_MAX_CLOCKS, "ptp"); + err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp"); if (err < 0) { pr_err("ptp: failed to allocate device region\n"); goto no_region; } - ptp_class->dev_attrs = ptp_dev_attrs; + ptp_class->dev_groups = ptp_groups; pr_info("PTP clock support registered\n"); return 0; @@ -340,6 +368,6 @@ no_region: subsys_initcall(ptp_init); module_exit(ptp_exit); -MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>"); +MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>"); MODULE_DESCRIPTION("PTP clocks support"); MODULE_LICENSE("GPL"); |