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staging: most: i2c: reduce parameters inconsistency 

Currently, there are two module parameters for the i2c driver:
  - polling_req: boolean irq/polling mode;
  - scan_rate: polling rate, that is used in the case where the polling
    mode is active

This model is misconfiguration-prone.  For example, it is possible to
select polling mode with the zero polling rate or configure non-zero
polling rate in a combination with the IRQ mode.

This patch replaces the 'polling_req' and 'scan_rate' by the
'polling_rate', where the value zero means the interrupt driven mode and
other values are used as the polling rate in the polling mode.

Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2018-05-08 11:45:02 +02:00 committed by Greg Kroah-Hartman
parent eb50842c5f
commit 7e6e228873
1 changed files with 12 additions and 21 deletions
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33
drivers/staging/most/i2c/i2c.c
View File

@ -28,18 +28,11 @@ enum { CH_RX, CH_TX, NUM_CHANNELS };
#define list_first_mbo(ptr) \
list_first_entry(ptr, struct mbo, list)
/* IRQ / Polling option */
static bool polling_req;
module_param(polling_req, bool, 0444);
MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)");
/* Polling Rate */
static int scan_rate = 100;
module_param(scan_rate, int, 0644);
MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 100");
static unsigned int polling_rate;
module_param(polling_rate, uint, 0644);
MODULE_PARM_DESC(polling_rate, "Polling rate [Hz]. Default = 0 (use IRQ)");
struct hdm_i2c {
bool polling_mode;
struct most_interface most_iface;
struct most_channel_capability capabilities[NUM_CHANNELS];
struct i2c_client *client;
@ -89,8 +82,7 @@ static int configure_channel(struct most_interface *most_iface,
}
if (channel_config->direction == MOST_CH_RX) {
dev->polling_mode = polling_req;
if (!dev->polling_mode) {
if (!polling_rate) {
if (dev->client->irq <= 0) {
pr_err("bad irq: %d\n", dev->client->irq);
return -ENOENT;
@ -103,8 +95,8 @@ static int configure_channel(struct most_interface *most_iface,
dev->client->irq, ret);
return ret;
}
} else if (scan_rate) {
delay = msecs_to_jiffies(MSEC_PER_SEC / scan_rate);
} else {
delay = msecs_to_jiffies(MSEC_PER_SEC / polling_rate);
dev->rx.delay = delay ? delay : 1;
pr = MSEC_PER_SEC / jiffies_to_msecs(dev->rx.delay);
pr_info("polling rate is %u Hz\n", pr);
@ -135,13 +127,13 @@ static int enqueue(struct most_interface *most_iface,
if (ch_idx == CH_RX) {
/* RX */
if (!dev->polling_mode)
if (!polling_rate)
disable_irq(dev->client->irq);
cancel_delayed_work_sync(&dev->rx.dwork);
list_add_tail(&mbo->list, &dev->rx.list);
if (dev->rx.int_disabled || dev->polling_mode)
if (dev->rx.int_disabled || polling_rate)
pending_rx_work(&dev->rx.dwork.work);
if (!dev->polling_mode)
if (!polling_rate)
enable_irq(dev->client->irq);
} else {
/* TX */
@ -179,7 +171,7 @@ static int poison_channel(struct most_interface *most_iface,
BUG_ON(ch_idx < 0 || ch_idx >= NUM_CHANNELS);
if (ch_idx == CH_RX) {
if (!dev->polling_mode)
if (!polling_rate)
free_irq(dev->client->irq, dev);
cancel_delayed_work_sync(&dev->rx.dwork);
@ -247,9 +239,8 @@ static void pending_rx_work(struct work_struct *work)
do_rx_work(dev);
if (dev->polling_mode) {
if (scan_rate)
schedule_delayed_work(&dev->rx.dwork, dev->rx.delay);
if (polling_rate) {
schedule_delayed_work(&dev->rx.dwork, dev->rx.delay);
} else {
dev->rx.int_disabled = false;
enable_irq(dev->client->irq);