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553 lines
14 KiB
553 lines
14 KiB
// 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; |
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else |
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flags &= ~NCT3018Y_REG_CLKO_CKE; |
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return i2c_smbus_write_byte_data(client, NCT3018Y_REG_CLKO, flags); |
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} |
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static int nct3018y_clkout_prepare(struct clk_hw *hw) |
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{ |
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return nct3018y_clkout_control(hw, 1); |
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} |
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static void nct3018y_clkout_unprepare(struct clk_hw *hw) |
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{ |
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nct3018y_clkout_control(hw, 0); |
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} |
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static int nct3018y_clkout_is_prepared(struct clk_hw *hw) |
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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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return flags & NCT3018Y_REG_CLKO_CKE; |
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} |
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static const struct clk_ops nct3018y_clkout_ops = { |
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.prepare = nct3018y_clkout_prepare, |
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.unprepare = nct3018y_clkout_unprepare, |
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.is_prepared = nct3018y_clkout_is_prepared, |
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.recalc_rate = nct3018y_clkout_recalc_rate, |
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.round_rate = nct3018y_clkout_round_rate, |
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.set_rate = nct3018y_clkout_set_rate, |
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}; |
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static struct clk *nct3018y_clkout_register_clk(struct nct3018y *nct3018y) |
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{ |
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struct i2c_client *client = nct3018y->client; |
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struct device_node *node = client->dev.of_node; |
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struct clk *clk; |
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struct clk_init_data init; |
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init.name = "nct3018y-clkout"; |
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init.ops = &nct3018y_clkout_ops; |
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init.flags = 0; |
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init.parent_names = NULL; |
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init.num_parents = 0; |
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nct3018y->clkout_hw.init = &init; |
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/* optional override of the clockname */ |
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of_property_read_string(node, "clock-output-names", &init.name); |
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/* register the clock */ |
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clk = devm_clk_register(&client->dev, &nct3018y->clkout_hw); |
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if (!IS_ERR(clk)) |
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of_clk_add_provider(node, of_clk_src_simple_get, clk); |
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return clk; |
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} |
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#endif |
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static const struct rtc_class_ops nct3018y_rtc_ops = { |
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.read_time = nct3018y_rtc_read_time, |
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.set_time = nct3018y_rtc_set_time, |
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.read_alarm = nct3018y_rtc_read_alarm, |
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.set_alarm = nct3018y_rtc_set_alarm, |
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.alarm_irq_enable = nct3018y_irq_enable, |
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.ioctl = nct3018y_ioctl, |
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}; |
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static int nct3018y_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct nct3018y *nct3018y; |
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int err, flags; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | |
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I2C_FUNC_SMBUS_BYTE | |
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I2C_FUNC_SMBUS_BLOCK_DATA)) |
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return -ENODEV; |
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nct3018y = devm_kzalloc(&client->dev, sizeof(struct nct3018y), |
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GFP_KERNEL); |
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if (!nct3018y) |
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return -ENOMEM; |
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i2c_set_clientdata(client, nct3018y); |
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nct3018y->client = client; |
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device_set_wakeup_capable(&client->dev, 1); |
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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, "%s: read error\n", __func__); |
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return flags; |
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} else if (flags & NCT3018Y_BIT_TWO) { |
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dev_dbg(&client->dev, "%s: NCT3018Y_BIT_TWO is set\n", __func__); |
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} |
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flags = NCT3018Y_BIT_TWO; |
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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 = 0; |
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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, "%s: write error\n", __func__); |
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return err; |
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} |
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nct3018y->rtc = devm_rtc_allocate_device(&client->dev); |
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if (IS_ERR(nct3018y->rtc)) |
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return PTR_ERR(nct3018y->rtc); |
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|
|
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 <[email protected]>"); |
|
MODULE_AUTHOR("Mia Lin <[email protected]>"); |
|
MODULE_DESCRIPTION("Nuvoton NCT3018Y RTC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|