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Date: Sat, 21 Aug 2010 18:00:28 +0530
From: hvaibhav@...com
To: linux-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, byron.bbradley@...il.com,
linux-omap@...r.kernel.org, felipe.balbi@...ia.com,
Vaibhav Hiremath <hvaibhav@...com>
Subject: [PATCH-V2 2/3] RTC:s35390a: Add Periodic interrupt support
From: Vaibhav Hiremath <hvaibhav@...com>
S35390A RTC supports 1, 2, 4, 8, 16 Hz periodic frequency.
So add Periodic frequency/interrupt related RTC APi's
- irq_set_freq,
- irq_set_state
Signed-off-by: Vaibhav Hiremath <hvaibhav@...com>
---
drivers/rtc/rtc-s35390a.c | 66 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 65 insertions(+), 1 deletions(-)
diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index 6010fc6..d8d59d7 100644
--- a/drivers/rtc/rtc-s35390a.c
+++ b/drivers/rtc/rtc-s35390a.c
@@ -331,6 +331,65 @@ static int s35390a_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
return s35390a_read_alarm(to_i2c_client(dev), alm);
}
+static int s35390a_freq_irq_enable(struct i2c_client *client, unsigned enabled)
+{
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+ char buf[1];
+ int err;
+
+ err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
+ if (err) {
+ dev_err(&client->dev, "%s: failed to read STS2 reg\n",
+ __func__);
+ return err;
+ }
+
+ /* This chip returns the bits of each byte in reverse order */
+ buf[0] = bitrev8(buf[0]);
+
+ buf[0] &= ~S35390A_INT1_MODE_MASK;
+ if (enabled)
+ buf[0] |= S35390A_INT1_MODE_FREQ;
+ else
+ buf[0] |= S35390A_INT1_MODE_NOINTR;
+
+ /* This chip expects the bits of each byte in reverse order */
+ buf[0] = bitrev8(buf[0]);
+
+ err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
+ if (err) {
+ dev_err(&client->dev, "%s: failed to set STS2 reg\n", __func__);
+ return err;
+ }
+
+ if (enabled) {
+ buf[0] = s35390a->rtc->irq_freq;
+ buf[0] = bitrev8(buf[0]);
+ err = s35390a_set_reg(s35390a, S35390A_CMD_INT1_REG1, buf,
+ sizeof(buf));
+ }
+
+ return err;
+}
+
+static int s35390a_rtc_freq_irq_enable(struct device *dev, int enabled)
+{
+ return s35390a_freq_irq_enable(to_i2c_client(dev), enabled);
+}
+
+static int s35390a_set_irq_freq(struct i2c_client *client, int freq)
+{
+ if (!is_power_of_2(freq) || (freq > 16))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int s35390a_rtc_set_irq_freq(struct device *dev, int freq)
+{
+ return s35390a_set_irq_freq(to_i2c_client(dev), freq);
+}
+
static irqreturn_t s35390a_irq_thread(int irq, void *handle)
{
char buf[1];
@@ -347,6 +406,8 @@ static irqreturn_t s35390a_irq_thread(int irq, void *handle)
if (buf[0] & BIT(2)) {
rtc_update_irq(s35390a->rtc, 1, RTC_IRQF | RTC_AF);
s35390a_alarm_irq_enable(client, 0);
+ } else if (buf[0] & BIT(0)) {
+ rtc_update_irq(s35390a->rtc, 1, RTC_IRQF | RTC_PF);
}
out:
@@ -359,7 +420,8 @@ static const struct rtc_class_ops s35390a_rtc_ops = {
.alarm_irq_enable = s35390a_rtc_alarm_irq_enable,
.set_alarm = s35390a_rtc_set_alarm,
.read_alarm = s35390a_rtc_read_alarm,
-
+ .irq_set_freq = s35390a_rtc_set_irq_freq,
+ .irq_set_state = s35390a_rtc_freq_irq_enable,
};
static struct i2c_driver s35390a_driver;
@@ -442,6 +504,8 @@ static int s35390a_probe(struct i2c_client *client,
err = PTR_ERR(s35390a->rtc);
goto exit_intr;
}
+ s35390a->rtc->irq_freq = 0;
+ s35390a->rtc->max_user_freq = 16;
return 0;
--
1.6.2.4
--
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