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hwmon: qpnp-adc-voltage: Add interval mode select option 

Enable interval mode before starting measurement interval
request and disable interval mode during single conversion
request. Add additional checks for high and low threshold
interrupt routine to check the mode is in recurring
measurement mode before threshold notification.

Change-Id: I8d1a92c801d2a8ad7b61305c146718aecaca9888
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
This commit is contained in:
Siddartha Mohanadoss 2014-10-03 17:15:02 -07:00
parent ae731133c8
commit 3bcdacf5a7
1 changed files with 45 additions and 3 deletions
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48
drivers/hwmon/qpnp-adc-voltage.c
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@ -49,6 +49,7 @@
#define QPNP_VADC_STATUS1_REQ_STS_EOC_MASK 0x3
#define QPNP_VADC_STATUS1_OP_MODE_MASK 0x18
#define QPNP_VADC_MEAS_INT_MODE 0x2
#define QPNP_VADC_MEAS_INT_MODE_MASK 0x10
#define QPNP_VADC_STATUS2 0x9
#define QPNP_VADC_STATUS2_CONV_SEQ_STATE 6
@ -74,6 +75,9 @@
#define QPNP_VADC_CONV_SEQ_HOLDOFF_SHIFT 4
#define QPNP_VADC_CONV_SEQ_TRIG_CTL 0x55
#define QPNP_VADC_MEAS_INTERVAL_CTL 0x57
#define QPNP_VADC_MEAS_INTERVAL_OP_CTL 0x59
#define QPNP_VADC_MEAS_INTERVAL_OP_SET BIT(7)
#define QPNP_VADC_CONV_SEQ_FALLING_EDGE 0x0
#define QPNP_VADC_CONV_SEQ_RISING_EDGE 0x1
#define QPNP_VADC_CONV_SEQ_EDGE_SHIFT 7
@ -326,7 +330,7 @@ static int32_t qpnp_vadc_configure(struct qpnp_vadc_chip *vadc,
struct qpnp_adc_amux_properties *chan_prop)
{
u8 decimation = 0, conv_sequence = 0, conv_sequence_trig = 0;
u8 mode_ctrl = 0;
u8 mode_ctrl = 0, meas_int_op_ctl_data = 0;
int rc = 0;
/* Mode selection */
@ -376,6 +380,13 @@ static int32_t qpnp_vadc_configure(struct qpnp_vadc_chip *vadc,
pr_err("Fast averaging configure error\n");
return rc;
}
/* Ensure MEAS_INTERVAL_OP_CTL is set to 0 */
rc = qpnp_vadc_write_reg(vadc, QPNP_VADC_MEAS_INTERVAL_OP_CTL,
meas_int_op_ctl_data);
if (rc < 0) {
pr_err("Measurement interval OP configure error\n");
return rc;
}
} else if (chan_prop->mode_sel == (ADC_OP_CONVERSION_SEQUENCER <<
QPNP_VADC_OP_MODE_SHIFT)) {
/* Conversion sequence mode */
@ -398,6 +409,13 @@ static int32_t qpnp_vadc_configure(struct qpnp_vadc_chip *vadc,
pr_err("Conversion trigger error\n");
return rc;
}
} else if (chan_prop->mode_sel == ADC_OP_MEASUREMENT_INTERVAL) {
rc = qpnp_vadc_write_reg(vadc, QPNP_VADC_MEAS_INTERVAL_OP_CTL,
QPNP_VADC_MEAS_INTERVAL_OP_SET);
if (rc < 0) {
pr_err("Measurement interval OP configure error\n");
return rc;
}
}
if (!vadc->vadc_poll_eoc)
@ -557,7 +575,19 @@ static irqreturn_t qpnp_vadc_isr(int irq, void *dev_id)
static irqreturn_t qpnp_vadc_low_thr_isr(int irq, void *data)
{
struct qpnp_vadc_chip *vadc = data;
u8 mode_ctl = 0;
u8 mode_ctl = 0, mode = 0;
int rc = 0;
rc = qpnp_vadc_read_reg(vadc, QPNP_VADC_MODE_CTL, &mode);
if (rc < 0) {
pr_err("mode ctl register read failed with %d\n", rc);
return rc;
}
if (!(mode & QPNP_VADC_MEAS_INT_MODE_MASK)) {
pr_debug("Spurious VADC threshold 0x%x\n", mode);
return IRQ_HANDLED;
}
mode_ctl = ADC_OP_NORMAL_MODE;
/* Set measurement in single measurement mode */
@ -571,7 +601,19 @@ static irqreturn_t qpnp_vadc_low_thr_isr(int irq, void *data)
static irqreturn_t qpnp_vadc_high_thr_isr(int irq, void *data)
{
struct qpnp_vadc_chip *vadc = data;
u8 mode_ctl = 0;
u8 mode_ctl = 0, mode = 0;
int rc = 0;
rc = qpnp_vadc_read_reg(vadc, QPNP_VADC_MODE_CTL, &mode);
if (rc < 0) {
pr_err("mode ctl register read failed with %d\n", rc);
return rc;
}
if (!(mode & QPNP_VADC_MEAS_INT_MODE_MASK)) {
pr_debug("Spurious VADC threshold 0x%x\n", mode);
return IRQ_HANDLED;
}
mode_ctl = ADC_OP_NORMAL_MODE;
/* Set measurement in single measurement mode */