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![Uwe Kleine-König](/assets/img/avatar_default.png)
The probe function doesn't make use of the i2c_device_id * parameter so it can be trivially converted. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20221021130706.178687-6-u.kleine-koenig@pengutronix.de Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
552 lines
14 KiB
C
552 lines
14 KiB
C
// 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,
|
|
.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)
|
|
{
|
|
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_new = 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");
|