Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932285Ab0HQIwb (ORCPT ); Tue, 17 Aug 2010 04:52:31 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:57022 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757089Ab0HQIsy (ORCPT ); Tue, 17 Aug 2010 04:48:54 -0400 From: hvaibhav@ti.com To: linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, byron.bbradley@gmail.com, linux-omap@vger.kernel.org, Vaibhav Hiremath Subject: [PATCH 2/3] RTC:s35390a: Add Periodic interrupt support Date: Tue, 17 Aug 2010 14:18:40 +0530 Message-Id: <1282034921-22167-3-git-send-email-hvaibhav@ti.com> X-Mailer: git-send-email 1.6.2.4 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3235 Lines: 114 From: Vaibhav Hiremath Signed-off-by: Vaibhav Hiremath --- 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 3d34fc5..d456b70 100644 --- a/drivers/rtc/rtc-s35390a.c +++ b/drivers/rtc/rtc-s35390a.c @@ -332,6 +332,65 @@ 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 void s35390a_work(struct work_struct *work) { struct s35390a *s35390a; @@ -354,6 +413,8 @@ static void s35390a_work(struct work_struct *work) 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); } enable_irq(client->irq); @@ -382,7 +443,8 @@ 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; @@ -465,6 +527,8 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/