michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: mchp: kscan: low power mode enabled

Browse source 
KSCAN driver updated to support low power feature

Signed-off-by: Manimaran A <manimaran.a@microchip.com>
This commit is contained in:
Manimaran A 2023-07-26 10:04:59 +05:30 • committed by Carles Cufí
commit 9b6c933678
1 changed files with 59 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

63
drivers/kscan/kscan_mchp_xec.c
View file

@ -20,6 +20,8 @@
#include <zephyr/sys/atomic.h>
#include <zephyr/logging/log.h>
#include <zephyr/irq.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/policy.h>
#define LOG_LEVEL CONFIG_KSCAN_LOG_LEVEL
LOG_MODULE_REGISTER(kscan_mchp_xec);
@ -42,13 +44,14 @@ LOG_MODULE_REGISTER(kscan_mchp_xec);
struct kscan_xec_config {
struct kscan_regs *regs;
const struct pinctrl_dev_config *pcfg;
uint8_t rsvd[3];
uint8_t girq;
uint8_t girq_pos;
uint8_t irq_pri;
uint8_t pcr_idx;
uint8_t pcr_pos;
uint8_t rsvd[3];
const struct pinctrl_dev_config *pcfg;
bool wakeup_source;
};
struct kscan_xec_data {
@ -370,7 +373,9 @@ void polling_task(const struct device *dev, void *dummy2, void *dummy3)
drive_keyboard_column(dev, KEYBOARD_COLUMN_DRIVE_ALL);
k_sem_take(&data->poll_lock, K_FOREVER);
#ifdef CONFIG_PM_DEVICE
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#endif
uint32_t start_poll_cycles = k_cycle_get_32();
while (atomic_get(&data->enable_scan) == 1U) {
@ -411,6 +416,9 @@ void polling_task(const struct device *dev, void *dummy2, void *dummy3)
/* Allow other threads to run while we sleep */
k_usleep(wait_period);
}
#ifdef CONFIG_PM_DEVICE
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
#endif
}
}
@ -449,6 +457,44 @@ static int kscan_xec_enable_interface(const struct device *dev)
return 0;
}
#ifdef CONFIG_PM_DEVICE
static int kscan_xec_pm_action(const struct device *dev, enum pm_device_action action)
{
struct kscan_xec_config const *cfg = dev->config;
struct kscan_regs *regs = cfg->regs;
int ret = 0;
switch (action) {
case PM_DEVICE_ACTION_RESUME:
if (!(cfg->wakeup_source)) {
ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (ret != 0) {
LOG_ERR("XEC KSCAN pinctrl init failed (%d)", ret);
return ret;
}
regs->KSO_SEL &= ~BIT(MCHP_KSCAN_KSO_EN_POS);
/* Clea Status register */
regs->KSI_STS = MCHP_KSCAN_KSO_SEL_REG_MASK;
regs->KSI_IEN = MCHP_KSCAN_KSI_IEN_REG_MASK;
}
break;
case PM_DEVICE_ACTION_SUSPEND:
if (!(cfg->wakeup_source)) {
regs->KSO_SEL |= BIT(MCHP_KSCAN_KSO_EN_POS);
regs->KSI_IEN = (~MCHP_KSCAN_KSI_IEN_REG_MASK);
ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_SLEEP);
if (ret == -ENOENT) { /* pinctrl-1 does not exist. */
ret = 0;
}
}
break;
default:
ret = -ENOTSUP;
}
return ret;
}
#endif /* CONFIG_PM_DEVICE */
static const struct kscan_driver_api kscan_xec_driver_api = {
.config = kscan_xec_configure,
.disable_callback = kscan_xec_inhibit_interface,
@ -505,6 +551,12 @@ static struct kscan_xec_data kbd_data;
PINCTRL_DT_INST_DEFINE(0);
/* To enable wakeup on the KSCAN, the DTS needs to have entries defined
* in the KSCAN node in the DTS specifying it as a wake source;
* Example as below
*
* wakeup-source;
*/
static struct kscan_xec_config kscan_xec_cfg_0 = {
.regs = (struct kscan_regs *)(DT_INST_REG_ADDR(0)),
.girq = (uint8_t)(DT_INST_PROP_BY_IDX(0, girqs, 0)),
@ -512,9 +564,12 @@ static struct kscan_xec_config kscan_xec_cfg_0 = {
.pcr_idx = (uint8_t)(DT_INST_PROP_BY_IDX(0, pcrs, 0)),
.pcr_pos = (uint8_t)(DT_INST_PROP_BY_IDX(0, pcrs, 1)),
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(0),
.wakeup_source = DT_INST_PROP(0, wakeup_source)
};
PM_DEVICE_DT_INST_DEFINE(0, kscan_xec_pm_action);
DEVICE_DT_INST_DEFINE(0, kscan_xec_init,
NULL, &kbd_data, &kscan_xec_cfg_0,
PM_DEVICE_DT_INST_GET(0), &kbd_data, &kscan_xec_cfg_0,
POST_KERNEL, CONFIG_KSCAN_INIT_PRIORITY,
&kscan_xec_driver_api);