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629 lines
16 KiB
629 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* An I2C driver for the Philips PCF8563 RTC |
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* Copyright 2005-06 Tower Technologies |
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* |
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* Author: Alessandro Zummo <[email protected]> |
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* Maintainers: http://www.nslu2-linux.org/ |
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* |
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* based on the other drivers in this same directory. |
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* |
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* http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf |
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*/ |
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|
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#include <linux/clk-provider.h> |
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#include <linux/i2c.h> |
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#include <linux/bcd.h> |
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#include <linux/rtc.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/err.h> |
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#define PCF8563_REG_ST1 0x00 /* status */ |
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#define PCF8563_REG_ST2 0x01 |
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#define PCF8563_BIT_AIE BIT(1) |
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#define PCF8563_BIT_AF BIT(3) |
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#define PCF8563_BITS_ST2_N (7 << 5) |
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#define PCF8563_REG_SC 0x02 /* datetime */ |
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#define PCF8563_REG_MN 0x03 |
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#define PCF8563_REG_HR 0x04 |
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#define PCF8563_REG_DM 0x05 |
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#define PCF8563_REG_DW 0x06 |
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#define PCF8563_REG_MO 0x07 |
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#define PCF8563_REG_YR 0x08 |
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#define PCF8563_REG_AMN 0x09 /* alarm */ |
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#define PCF8563_REG_CLKO 0x0D /* clock out */ |
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#define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */ |
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#define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */ |
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#define PCF8563_REG_CLKO_F_32768HZ 0x00 |
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#define PCF8563_REG_CLKO_F_1024HZ 0x01 |
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#define PCF8563_REG_CLKO_F_32HZ 0x02 |
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#define PCF8563_REG_CLKO_F_1HZ 0x03 |
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#define PCF8563_REG_TMRC 0x0E /* timer control */ |
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#define PCF8563_TMRC_ENABLE BIT(7) |
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#define PCF8563_TMRC_4096 0 |
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#define PCF8563_TMRC_64 1 |
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#define PCF8563_TMRC_1 2 |
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#define PCF8563_TMRC_1_60 3 |
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#define PCF8563_TMRC_MASK 3 |
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#define PCF8563_REG_TMR 0x0F /* timer */ |
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#define PCF8563_SC_LV 0x80 /* low voltage */ |
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#define PCF8563_MO_C 0x80 /* century */ |
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static struct i2c_driver pcf8563_driver; |
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struct pcf8563 { |
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struct rtc_device *rtc; |
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/* |
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* The meaning of MO_C bit varies by the chip type. |
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* From PCF8563 datasheet: this bit is toggled when the years |
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* register overflows from 99 to 00 |
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* 0 indicates the century is 20xx |
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* 1 indicates the century is 19xx |
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* From RTC8564 datasheet: this bit indicates change of |
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* century. When the year digit data overflows from 99 to 00, |
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* this bit is set. By presetting it to 0 while still in the |
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* 20th century, it will be set in year 2000, ... |
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* There seems no reliable way to know how the system use this |
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* bit. So let's do it heuristically, assuming we are live in |
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* 1970...2069. |
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*/ |
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int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ |
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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 pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, |
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unsigned char length, unsigned char *buf) |
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{ |
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struct i2c_msg msgs[] = { |
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{/* setup read ptr */ |
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.addr = client->addr, |
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.len = 1, |
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.buf = ®, |
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}, |
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{ |
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.addr = client->addr, |
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.flags = I2C_M_RD, |
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.len = length, |
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.buf = buf |
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}, |
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}; |
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if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { |
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dev_err(&client->dev, "%s: read error\n", __func__); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int pcf8563_write_block_data(struct i2c_client *client, |
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unsigned char reg, unsigned char length, |
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unsigned char *buf) |
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{ |
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int i, err; |
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for (i = 0; i < length; i++) { |
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unsigned char data[2] = { reg + i, buf[i] }; |
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err = i2c_master_send(client, data, sizeof(data)); |
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if (err != sizeof(data)) { |
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dev_err(&client->dev, |
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"%s: err=%d addr=%02x, data=%02x\n", |
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__func__, err, data[0], data[1]); |
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return -EIO; |
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} |
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} |
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return 0; |
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} |
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static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) |
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{ |
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unsigned char buf; |
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int err; |
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); |
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if (err < 0) |
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return err; |
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if (on) |
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buf |= PCF8563_BIT_AIE; |
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else |
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buf &= ~PCF8563_BIT_AIE; |
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buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); |
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err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); |
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if (err < 0) { |
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dev_err(&client->dev, "%s: write error\n", __func__); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, |
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unsigned char *pen) |
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{ |
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unsigned char buf; |
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int err; |
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); |
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if (err) |
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return err; |
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if (en) |
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*en = !!(buf & PCF8563_BIT_AIE); |
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if (pen) |
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*pen = !!(buf & PCF8563_BIT_AF); |
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return 0; |
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} |
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static irqreturn_t pcf8563_irq(int irq, void *dev_id) |
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{ |
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struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); |
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int err; |
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char pending; |
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err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); |
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if (err) |
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return IRQ_NONE; |
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if (pending) { |
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rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); |
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pcf8563_set_alarm_mode(pcf8563->client, 1); |
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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 pcf8563 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 pcf8563_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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struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
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unsigned char buf[9]; |
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int err; |
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err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); |
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if (err) |
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return err; |
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if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { |
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dev_err(&client->dev, |
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"low voltage detected, date/time is not reliable.\n"); |
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return -EINVAL; |
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} |
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dev_dbg(&client->dev, |
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"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " |
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"mday=%02x, wday=%02x, mon=%02x, year=%02x\n", |
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__func__, |
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buf[0], buf[1], buf[2], buf[3], |
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buf[4], buf[5], buf[6], buf[7], |
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buf[8]); |
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tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); |
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tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); |
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tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ |
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tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); |
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tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; |
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tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ |
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tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100; |
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/* detect the polarity heuristically. see note above. */ |
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pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? |
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(tm->tm_year >= 100) : (tm->tm_year < 100); |
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
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"mday=%d, mon=%d, year=%d, wday=%d\n", |
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__func__, |
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tm->tm_sec, tm->tm_min, tm->tm_hour, |
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
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return 0; |
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} |
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static int pcf8563_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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struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
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unsigned char buf[9]; |
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dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " |
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"mday=%d, mon=%d, year=%d, wday=%d\n", |
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__func__, |
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tm->tm_sec, tm->tm_min, tm->tm_hour, |
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
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/* hours, minutes and seconds */ |
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buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); |
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buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); |
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buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); |
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buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); |
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/* month, 1 - 12 */ |
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buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); |
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/* year and century */ |
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buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100); |
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if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) |
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buf[PCF8563_REG_MO] |= PCF8563_MO_C; |
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buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; |
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return pcf8563_write_block_data(client, PCF8563_REG_SC, |
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9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); |
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} |
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static int pcf8563_rtc_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 ret; |
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switch (cmd) { |
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case RTC_VL_READ: |
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ret = i2c_smbus_read_byte_data(client, PCF8563_REG_SC); |
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if (ret < 0) |
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return ret; |
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return put_user(ret & PCF8563_SC_LV ? RTC_VL_DATA_INVALID : 0, |
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(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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static int pcf8563_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[4]; |
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int err; |
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err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); |
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if (err) |
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return err; |
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dev_dbg(&client->dev, |
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"%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", |
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__func__, buf[0], buf[1], buf[2], buf[3]); |
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tm->time.tm_sec = 0; |
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tm->time.tm_min = bcd2bin(buf[0] & 0x7F); |
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tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); |
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tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); |
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tm->time.tm_wday = bcd2bin(buf[3] & 0x7); |
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err = pcf8563_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: tm is mins=%d, hours=%d, mday=%d, wday=%d," |
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" enabled=%d, pending=%d\n", __func__, tm->time.tm_min, |
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tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, |
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tm->enabled, tm->pending); |
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return 0; |
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} |
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static int pcf8563_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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unsigned char buf[4]; |
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int err; |
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/* The alarm has no seconds, round up to nearest minute */ |
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if (tm->time.tm_sec) { |
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time64_t alarm_time = rtc_tm_to_time64(&tm->time); |
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alarm_time += 60 - tm->time.tm_sec; |
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rtc_time64_to_tm(alarm_time, &tm->time); |
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} |
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dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " |
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"enabled=%d pending=%d\n", __func__, |
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tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, |
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tm->time.tm_mday, tm->enabled, tm->pending); |
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buf[0] = bin2bcd(tm->time.tm_min); |
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buf[1] = bin2bcd(tm->time.tm_hour); |
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buf[2] = bin2bcd(tm->time.tm_mday); |
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buf[3] = tm->time.tm_wday & 0x07; |
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err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); |
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if (err) |
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return err; |
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return pcf8563_set_alarm_mode(client, !!tm->enabled); |
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} |
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static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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dev_dbg(dev, "%s: en=%d\n", __func__, enabled); |
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return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); |
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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_pcf8563(_hw) container_of(_hw, struct pcf8563, 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 pcf8563_clkout_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); |
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struct i2c_client *client = pcf8563->client; |
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unsigned char buf; |
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int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); |
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if (ret < 0) |
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return 0; |
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buf &= PCF8563_REG_CLKO_F_MASK; |
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return clkout_rates[buf]; |
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} |
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static long pcf8563_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 pcf8563_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 pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); |
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struct i2c_client *client = pcf8563->client; |
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unsigned char buf; |
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int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); |
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int i; |
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if (ret < 0) |
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return ret; |
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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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buf &= ~PCF8563_REG_CLKO_F_MASK; |
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buf |= i; |
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ret = pcf8563_write_block_data(client, |
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PCF8563_REG_CLKO, 1, |
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&buf); |
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return ret; |
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} |
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|
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return -EINVAL; |
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} |
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static int pcf8563_clkout_control(struct clk_hw *hw, bool enable) |
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{ |
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struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); |
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struct i2c_client *client = pcf8563->client; |
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unsigned char buf; |
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int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); |
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|
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if (ret < 0) |
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return ret; |
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|
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if (enable) |
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buf |= PCF8563_REG_CLKO_FE; |
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else |
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buf &= ~PCF8563_REG_CLKO_FE; |
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|
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ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); |
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return ret; |
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} |
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static int pcf8563_clkout_prepare(struct clk_hw *hw) |
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{ |
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return pcf8563_clkout_control(hw, 1); |
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} |
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|
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static void pcf8563_clkout_unprepare(struct clk_hw *hw) |
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{ |
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pcf8563_clkout_control(hw, 0); |
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} |
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|
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static int pcf8563_clkout_is_prepared(struct clk_hw *hw) |
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{ |
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struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); |
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struct i2c_client *client = pcf8563->client; |
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unsigned char buf; |
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int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); |
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|
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if (ret < 0) |
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return ret; |
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|
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return !!(buf & PCF8563_REG_CLKO_FE); |
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} |
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|
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static const struct clk_ops pcf8563_clkout_ops = { |
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.prepare = pcf8563_clkout_prepare, |
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.unprepare = pcf8563_clkout_unprepare, |
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.is_prepared = pcf8563_clkout_is_prepared, |
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.recalc_rate = pcf8563_clkout_recalc_rate, |
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.round_rate = pcf8563_clkout_round_rate, |
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.set_rate = pcf8563_clkout_set_rate, |
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}; |
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|
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static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563) |
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{ |
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struct i2c_client *client = pcf8563->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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int ret; |
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unsigned char buf; |
|
|
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/* disable the clkout output */ |
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buf = 0; |
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ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); |
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if (ret < 0) |
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return ERR_PTR(ret); |
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|
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init.name = "pcf8563-clkout"; |
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init.ops = &pcf8563_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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pcf8563->clkout_hw.init = &init; |
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|
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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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|
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/* register the clock */ |
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clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw); |
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|
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if (!IS_ERR(clk)) |
|
of_clk_add_provider(node, of_clk_src_simple_get, clk); |
|
|
|
return clk; |
|
} |
|
#endif |
|
|
|
static const struct rtc_class_ops pcf8563_rtc_ops = { |
|
.ioctl = pcf8563_rtc_ioctl, |
|
.read_time = pcf8563_rtc_read_time, |
|
.set_time = pcf8563_rtc_set_time, |
|
.read_alarm = pcf8563_rtc_read_alarm, |
|
.set_alarm = pcf8563_rtc_set_alarm, |
|
.alarm_irq_enable = pcf8563_irq_enable, |
|
}; |
|
|
|
static int pcf8563_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct pcf8563 *pcf8563; |
|
int err; |
|
unsigned char buf; |
|
|
|
dev_dbg(&client->dev, "%s\n", __func__); |
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
|
return -ENODEV; |
|
|
|
pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), |
|
GFP_KERNEL); |
|
if (!pcf8563) |
|
return -ENOMEM; |
|
|
|
i2c_set_clientdata(client, pcf8563); |
|
pcf8563->client = client; |
|
device_set_wakeup_capable(&client->dev, 1); |
|
|
|
/* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ |
|
buf = PCF8563_TMRC_1_60; |
|
err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); |
|
if (err < 0) { |
|
dev_err(&client->dev, "%s: write error\n", __func__); |
|
return err; |
|
} |
|
|
|
/* Clear flags and disable interrupts */ |
|
buf = 0; |
|
err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); |
|
if (err < 0) { |
|
dev_err(&client->dev, "%s: write error\n", __func__); |
|
return err; |
|
} |
|
|
|
pcf8563->rtc = devm_rtc_allocate_device(&client->dev); |
|
if (IS_ERR(pcf8563->rtc)) |
|
return PTR_ERR(pcf8563->rtc); |
|
|
|
pcf8563->rtc->ops = &pcf8563_rtc_ops; |
|
/* the pcf8563 alarm only supports a minute accuracy */ |
|
pcf8563->rtc->uie_unsupported = 1; |
|
pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
|
pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099; |
|
pcf8563->rtc->set_start_time = true; |
|
|
|
if (client->irq > 0) { |
|
err = devm_request_threaded_irq(&client->dev, client->irq, |
|
NULL, pcf8563_irq, |
|
IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW, |
|
pcf8563_driver.driver.name, client); |
|
if (err) { |
|
dev_err(&client->dev, "unable to request IRQ %d\n", |
|
client->irq); |
|
return err; |
|
} |
|
} |
|
|
|
err = devm_rtc_register_device(pcf8563->rtc); |
|
if (err) |
|
return err; |
|
|
|
#ifdef CONFIG_COMMON_CLK |
|
/* register clk in common clk framework */ |
|
pcf8563_clkout_register_clk(pcf8563); |
|
#endif |
|
|
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id pcf8563_id[] = { |
|
{ "pcf8563", 0 }, |
|
{ "rtc8564", 0 }, |
|
{ "pca8565", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, pcf8563_id); |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id pcf8563_of_match[] = { |
|
{ .compatible = "nxp,pcf8563" }, |
|
{ .compatible = "epson,rtc8564" }, |
|
{ .compatible = "microcrystal,rv8564" }, |
|
{ .compatible = "nxp,pca8565" }, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(of, pcf8563_of_match); |
|
#endif |
|
|
|
static struct i2c_driver pcf8563_driver = { |
|
.driver = { |
|
.name = "rtc-pcf8563", |
|
.of_match_table = of_match_ptr(pcf8563_of_match), |
|
}, |
|
.probe = pcf8563_probe, |
|
.id_table = pcf8563_id, |
|
}; |
|
|
|
module_i2c_driver(pcf8563_driver); |
|
|
|
MODULE_AUTHOR("Alessandro Zummo <[email protected]>"); |
|
MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|