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rtc: Add NCT3018Y real time clock driver
Add real time clock support for NCT3018Y. Signed-off-by: Mia Lin <mimi05633@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20220713090647.8028-4-mimi05633@gmail.com
This commit is contained in:
parent
8b30b09317
commit
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4 changed files with 565 additions and 0 deletions
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@ -2451,6 +2451,7 @@ F: arch/arm/boot/dts/nuvoton-npcm*
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F: arch/arm/mach-npcm/
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F: drivers/*/*npcm*
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F: drivers/*/*/*npcm*
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F: drivers/rtc/rtc-nct3018y.c
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F: include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
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ARM/NUVOTON WPCM450 ARCHITECTURE
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@ -383,6 +383,16 @@ config RTC_DRV_MAX77686
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This driver can also be built as a module. If so, the module
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will be called rtc-max77686.
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config RTC_DRV_NCT3018Y
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tristate "Nuvoton NCT3018Y"
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depends on OF
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help
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If you say yes here you get support for the Nuvoton NCT3018Y I2C RTC
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chip.
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This driver can also be built as a module, if so, the module will be
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called "rtc-nct3018y".
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config RTC_DRV_RK808
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tristate "Rockchip RK805/RK808/RK809/RK817/RK818 RTC"
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depends on MFD_RK808
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@ -112,6 +112,7 @@ obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
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obj-$(CONFIG_RTC_DRV_MXC) += rtc-mxc.o
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obj-$(CONFIG_RTC_DRV_MXC_V2) += rtc-mxc_v2.o
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obj-$(CONFIG_RTC_DRV_GAMECUBE) += rtc-gamecube.o
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obj-$(CONFIG_RTC_DRV_NCT3018Y) += rtc-nct3018y.o
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obj-$(CONFIG_RTC_DRV_NTXEC) += rtc-ntxec.o
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obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
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obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o
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553
drivers/rtc/rtc-nct3018y.c
Normal file
553
drivers/rtc/rtc-nct3018y.c
Normal file
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@ -0,0 +1,553 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2022 Nuvoton Technology Corporation
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#include <linux/bcd.h>
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#define NCT3018Y_REG_SC 0x00 /* seconds */
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#define NCT3018Y_REG_SCA 0x01 /* alarm */
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#define NCT3018Y_REG_MN 0x02
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#define NCT3018Y_REG_MNA 0x03 /* alarm */
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#define NCT3018Y_REG_HR 0x04
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#define NCT3018Y_REG_HRA 0x05 /* alarm */
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#define NCT3018Y_REG_DW 0x06
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#define NCT3018Y_REG_DM 0x07
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#define NCT3018Y_REG_MO 0x08
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#define NCT3018Y_REG_YR 0x09
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#define NCT3018Y_REG_CTRL 0x0A /* timer control */
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#define NCT3018Y_REG_ST 0x0B /* status */
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#define NCT3018Y_REG_CLKO 0x0C /* clock out */
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#define NCT3018Y_BIT_AF BIT(7)
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#define NCT3018Y_BIT_ST BIT(7)
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#define NCT3018Y_BIT_DM BIT(6)
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#define NCT3018Y_BIT_HF BIT(5)
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#define NCT3018Y_BIT_DSM BIT(4)
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#define NCT3018Y_BIT_AIE BIT(3)
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#define NCT3018Y_BIT_OFIE BIT(2)
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#define NCT3018Y_BIT_CIE BIT(1)
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#define NCT3018Y_BIT_TWO BIT(0)
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#define NCT3018Y_REG_BAT_MASK 0x07
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#define NCT3018Y_REG_CLKO_F_MASK 0x03 /* frequenc mask */
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#define NCT3018Y_REG_CLKO_CKE 0x80 /* clock out enabled */
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struct nct3018y {
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struct rtc_device *rtc;
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struct i2c_client *client;
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#ifdef CONFIG_COMMON_CLK
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struct clk_hw clkout_hw;
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#endif
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};
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static int nct3018y_set_alarm_mode(struct i2c_client *client, bool on)
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{
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int err, flags;
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dev_dbg(&client->dev, "%s:on:%d\n", __func__, on);
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
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if (flags < 0) {
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dev_dbg(&client->dev,
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"Failed to read NCT3018Y_REG_CTRL\n");
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return flags;
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}
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if (on)
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flags |= NCT3018Y_BIT_AIE;
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else
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flags &= ~NCT3018Y_BIT_AIE;
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flags |= NCT3018Y_BIT_CIE;
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL\n");
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return err;
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}
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_ST);
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if (flags < 0) {
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dev_dbg(&client->dev,
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"Failed to read NCT3018Y_REG_ST\n");
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return flags;
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}
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flags &= ~(NCT3018Y_BIT_AF);
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_ST, flags);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_ST\n");
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return err;
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}
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return 0;
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}
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static int nct3018y_get_alarm_mode(struct i2c_client *client, unsigned char *alarm_enable,
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unsigned char *alarm_flag)
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{
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int flags;
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if (alarm_enable) {
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dev_dbg(&client->dev, "%s:NCT3018Y_REG_CTRL\n", __func__);
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
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if (flags < 0)
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return flags;
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*alarm_enable = flags & NCT3018Y_BIT_AIE;
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}
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if (alarm_flag) {
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dev_dbg(&client->dev, "%s:NCT3018Y_REG_ST\n", __func__);
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_ST);
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if (flags < 0)
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return flags;
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*alarm_flag = flags & NCT3018Y_BIT_AF;
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}
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dev_dbg(&client->dev, "%s:alarm_enable:%x alarm_flag:%x\n",
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__func__, *alarm_enable, *alarm_flag);
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return 0;
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}
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static irqreturn_t nct3018y_irq(int irq, void *dev_id)
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{
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struct nct3018y *nct3018y = i2c_get_clientdata(dev_id);
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struct i2c_client *client = nct3018y->client;
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int err;
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unsigned char alarm_flag;
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unsigned char alarm_enable;
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dev_dbg(&client->dev, "%s:irq:%d\n", __func__, irq);
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err = nct3018y_get_alarm_mode(nct3018y->client, &alarm_enable, &alarm_flag);
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if (err)
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return IRQ_NONE;
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if (alarm_flag) {
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dev_dbg(&client->dev, "%s:alarm flag:%x\n",
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__func__, alarm_flag);
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rtc_update_irq(nct3018y->rtc, 1, RTC_IRQF | RTC_AF);
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nct3018y_set_alarm_mode(nct3018y->client, 0);
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dev_dbg(&client->dev, "%s:IRQ_HANDLED\n", __func__);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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/*
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* In the routines that deal directly with the nct3018y hardware, we use
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* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
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*/
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static int nct3018y_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[10];
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int err;
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err = i2c_smbus_read_i2c_block_data(client, NCT3018Y_REG_ST, 1, buf);
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if (err < 0)
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return err;
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if (!buf[0]) {
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dev_dbg(&client->dev, " voltage <=1.7, date/time is not reliable.\n");
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return -EINVAL;
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}
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err = i2c_smbus_read_i2c_block_data(client, NCT3018Y_REG_SC, sizeof(buf), buf);
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if (err < 0)
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return err;
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tm->tm_sec = bcd2bin(buf[0] & 0x7F);
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tm->tm_min = bcd2bin(buf[2] & 0x7F);
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tm->tm_hour = bcd2bin(buf[4] & 0x3F);
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tm->tm_wday = buf[6] & 0x07;
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tm->tm_mday = bcd2bin(buf[7] & 0x3F);
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tm->tm_mon = bcd2bin(buf[8] & 0x1F) - 1;
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tm->tm_year = bcd2bin(buf[9]) + 100;
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return 0;
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}
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static int nct3018y_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[4] = {0};
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int err;
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buf[0] = bin2bcd(tm->tm_sec);
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_SC, buf[0]);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_SC\n");
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return err;
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}
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buf[0] = bin2bcd(tm->tm_min);
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_MN, buf[0]);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_MN\n");
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return err;
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}
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buf[0] = bin2bcd(tm->tm_hour);
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_HR, buf[0]);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_HR\n");
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return err;
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}
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buf[0] = tm->tm_wday & 0x07;
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buf[1] = bin2bcd(tm->tm_mday);
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buf[2] = bin2bcd(tm->tm_mon + 1);
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buf[3] = bin2bcd(tm->tm_year - 100);
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err = i2c_smbus_write_i2c_block_data(client, NCT3018Y_REG_DW,
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sizeof(buf), buf);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write for day and mon and year\n");
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return -EIO;
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}
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return err;
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}
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static int nct3018y_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[5];
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int err;
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err = i2c_smbus_read_i2c_block_data(client, NCT3018Y_REG_SCA,
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sizeof(buf), buf);
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to read date\n");
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return -EIO;
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}
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dev_dbg(&client->dev, "%s: raw data is sec=%02x, min=%02x hr=%02x\n",
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__func__, buf[0], buf[2], buf[4]);
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tm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
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tm->time.tm_min = bcd2bin(buf[2] & 0x7F);
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tm->time.tm_hour = bcd2bin(buf[4] & 0x3F);
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err = nct3018y_get_alarm_mode(client, &tm->enabled, &tm->pending);
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if (err < 0)
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return err;
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dev_dbg(&client->dev, "%s:s=%d m=%d, hr=%d, enabled=%d, pending=%d\n",
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__func__, tm->time.tm_sec, tm->time.tm_min,
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tm->time.tm_hour, tm->enabled, tm->pending);
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return 0;
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}
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static int nct3018y_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int err;
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dev_dbg(dev, "%s, sec=%d, min=%d hour=%d tm->enabled:%d\n",
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__func__, tm->time.tm_sec, tm->time.tm_min, tm->time.tm_hour,
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tm->enabled);
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_SCA, bin2bcd(tm->time.tm_sec));
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_SCA\n");
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return err;
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}
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_MNA, bin2bcd(tm->time.tm_min));
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_MNA\n");
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return err;
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}
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err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_HRA, bin2bcd(tm->time.tm_hour));
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if (err < 0) {
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dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_HRA\n");
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return err;
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}
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return nct3018y_set_alarm_mode(client, tm->enabled);
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}
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static int nct3018y_irq_enable(struct device *dev, unsigned int enabled)
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{
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dev_dbg(dev, "%s: alarm enable=%d\n", __func__, enabled);
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return nct3018y_set_alarm_mode(to_i2c_client(dev), enabled);
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}
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static int nct3018y_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int status, flags = 0;
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switch (cmd) {
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case RTC_VL_READ:
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status = i2c_smbus_read_byte_data(client, NCT3018Y_REG_ST);
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if (status < 0)
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return status;
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if (!(status & NCT3018Y_REG_BAT_MASK))
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flags |= RTC_VL_DATA_INVALID;
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return put_user(flags, (unsigned int __user *)arg);
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default:
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return -ENOIOCTLCMD;
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}
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}
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#ifdef CONFIG_COMMON_CLK
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/*
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* Handling of the clkout
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*/
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#define clkout_hw_to_nct3018y(_hw) container_of(_hw, struct nct3018y, clkout_hw)
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static const int clkout_rates[] = {
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32768,
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1024,
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32,
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1,
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};
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static unsigned long nct3018y_clkout_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct nct3018y *nct3018y = clkout_hw_to_nct3018y(hw);
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struct i2c_client *client = nct3018y->client;
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int flags;
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CLKO);
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if (flags < 0)
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return 0;
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flags &= NCT3018Y_REG_CLKO_F_MASK;
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return clkout_rates[flags];
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}
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static long nct3018y_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
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if (clkout_rates[i] <= rate)
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return clkout_rates[i];
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return 0;
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}
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static int nct3018y_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct nct3018y *nct3018y = clkout_hw_to_nct3018y(hw);
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struct i2c_client *client = nct3018y->client;
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int i, flags;
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CLKO);
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if (flags < 0)
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return flags;
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for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
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if (clkout_rates[i] == rate) {
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flags &= ~NCT3018Y_REG_CLKO_F_MASK;
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flags |= i;
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return i2c_smbus_write_byte_data(client, NCT3018Y_REG_CLKO, flags);
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}
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return -EINVAL;
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}
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static int nct3018y_clkout_control(struct clk_hw *hw, bool enable)
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{
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struct nct3018y *nct3018y = clkout_hw_to_nct3018y(hw);
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struct i2c_client *client = nct3018y->client;
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int flags;
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flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CLKO);
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if (flags < 0)
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return flags;
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if (enable)
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flags |= NCT3018Y_REG_CLKO_CKE;
|
||||
else
|
||||
flags &= ~NCT3018Y_REG_CLKO_CKE;
|
||||
|
||||
return i2c_smbus_write_byte_data(client, NCT3018Y_REG_CLKO, flags);
|
||||
}
|
||||
|
||||
static int nct3018y_clkout_prepare(struct clk_hw *hw)
|
||||
{
|
||||
return nct3018y_clkout_control(hw, 1);
|
||||
}
|
||||
|
||||
static void nct3018y_clkout_unprepare(struct clk_hw *hw)
|
||||
{
|
||||
nct3018y_clkout_control(hw, 0);
|
||||
}
|
||||
|
||||
static int nct3018y_clkout_is_prepared(struct clk_hw *hw)
|
||||
{
|
||||
struct nct3018y *nct3018y = clkout_hw_to_nct3018y(hw);
|
||||
struct i2c_client *client = nct3018y->client;
|
||||
int flags;
|
||||
|
||||
flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CLKO);
|
||||
if (flags < 0)
|
||||
return flags;
|
||||
|
||||
return flags & NCT3018Y_REG_CLKO_CKE;
|
||||
}
|
||||
|
||||
static const struct clk_ops nct3018y_clkout_ops = {
|
||||
.prepare = nct3018y_clkout_prepare,
|
||||
.unprepare = nct3018y_clkout_unprepare,
|
||||
.is_prepared = nct3018y_clkout_is_prepared,
|
||||
.recalc_rate = nct3018y_clkout_recalc_rate,
|
||||
.round_rate = nct3018y_clkout_round_rate,
|
||||
.set_rate = nct3018y_clkout_set_rate,
|
||||
};
|
||||
|
||||
static struct clk *nct3018y_clkout_register_clk(struct nct3018y *nct3018y)
|
||||
{
|
||||
struct i2c_client *client = nct3018y->client;
|
||||
struct device_node *node = client->dev.of_node;
|
||||
struct clk *clk;
|
||||
struct clk_init_data init;
|
||||
|
||||
init.name = "nct3018y-clkout";
|
||||
init.ops = &nct3018y_clkout_ops;
|
||||
init.flags = 0;
|
||||
init.parent_names = NULL;
|
||||
init.num_parents = 0;
|
||||
nct3018y->clkout_hw.init = &init;
|
||||
|
||||
/* optional override of the clockname */
|
||||
of_property_read_string(node, "clock-output-names", &init.name);
|
||||
|
||||
/* register the clock */
|
||||
clk = devm_clk_register(&client->dev, &nct3018y->clkout_hw);
|
||||
|
||||
if (!IS_ERR(clk))
|
||||
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
||||
|
||||
return clk;
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct rtc_class_ops nct3018y_rtc_ops = {
|
||||
.read_time = nct3018y_rtc_read_time,
|
||||
.set_time = nct3018y_rtc_set_time,
|
||||
.read_alarm = nct3018y_rtc_read_alarm,
|
||||
.set_alarm = nct3018y_rtc_set_alarm,
|
||||
.alarm_irq_enable = nct3018y_irq_enable,
|
||||
.ioctl = nct3018y_ioctl,
|
||||
};
|
||||
|
||||
static int nct3018y_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct nct3018y *nct3018y;
|
||||
int err, flags;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
|
||||
I2C_FUNC_SMBUS_BYTE |
|
||||
I2C_FUNC_SMBUS_BLOCK_DATA))
|
||||
return -ENODEV;
|
||||
|
||||
nct3018y = devm_kzalloc(&client->dev, sizeof(struct nct3018y),
|
||||
GFP_KERNEL);
|
||||
if (!nct3018y)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, nct3018y);
|
||||
nct3018y->client = client;
|
||||
device_set_wakeup_capable(&client->dev, 1);
|
||||
|
||||
flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
|
||||
if (flags < 0) {
|
||||
dev_dbg(&client->dev, "%s: read error\n", __func__);
|
||||
return flags;
|
||||
} else if (flags & NCT3018Y_BIT_TWO) {
|
||||
dev_dbg(&client->dev, "%s: NCT3018Y_BIT_TWO is set\n", __func__);
|
||||
}
|
||||
|
||||
flags = NCT3018Y_BIT_TWO;
|
||||
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
|
||||
if (err < 0) {
|
||||
dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
flags = 0;
|
||||
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_ST, flags);
|
||||
if (err < 0) {
|
||||
dev_dbg(&client->dev, "%s: write error\n", __func__);
|
||||
return err;
|
||||
}
|
||||
|
||||
nct3018y->rtc = devm_rtc_allocate_device(&client->dev);
|
||||
if (IS_ERR(nct3018y->rtc))
|
||||
return PTR_ERR(nct3018y->rtc);
|
||||
|
||||
nct3018y->rtc->ops = &nct3018y_rtc_ops;
|
||||
nct3018y->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
|
||||
nct3018y->rtc->range_max = RTC_TIMESTAMP_END_2099;
|
||||
|
||||
if (client->irq > 0) {
|
||||
err = devm_request_threaded_irq(&client->dev, client->irq,
|
||||
NULL, nct3018y_irq,
|
||||
IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
|
||||
"nct3018y", client);
|
||||
if (err) {
|
||||
dev_dbg(&client->dev, "unable to request IRQ %d\n", client->irq);
|
||||
return err;
|
||||
}
|
||||
} else {
|
||||
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, nct3018y->rtc->features);
|
||||
clear_bit(RTC_FEATURE_ALARM, nct3018y->rtc->features);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMMON_CLK
|
||||
/* register clk in common clk framework */
|
||||
nct3018y_clkout_register_clk(nct3018y);
|
||||
#endif
|
||||
|
||||
return devm_rtc_register_device(nct3018y->rtc);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id nct3018y_id[] = {
|
||||
{ "nct3018y", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, nct3018y_id);
|
||||
|
||||
static const struct of_device_id nct3018y_of_match[] = {
|
||||
{ .compatible = "nuvoton,nct3018y" },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, nct3018y_of_match);
|
||||
|
||||
static struct i2c_driver nct3018y_driver = {
|
||||
.driver = {
|
||||
.name = "rtc-nct3018y",
|
||||
.of_match_table = of_match_ptr(nct3018y_of_match),
|
||||
},
|
||||
.probe = nct3018y_probe,
|
||||
.id_table = nct3018y_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(nct3018y_driver);
|
||||
|
||||
MODULE_AUTHOR("Medad CChien <ctcchien@nuvoton.com>");
|
||||
MODULE_AUTHOR("Mia Lin <mimi05633@gmail.com>");
|
||||
MODULE_DESCRIPTION("Nuvoton NCT3018Y RTC driver");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in a new issue