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linux/drivers/rtc/rtc-pcf85063.c
Marc Ferland 1c1b3098ae rtc: pcf85063: add i2c_device_id name matching support 
The pcf85063 driver regsitration currently supports the "compatible"
property type of matching (for DT).

This patch adds "matching by name" support to the driver by defining
an i2c_device_id table and setting the id_table parameter in the
i2c_driver struct.

This will, for example, make the driver easier to instantiate on
systems where CONFIG_OF is not enabled (x86 in my case).

Signed-off-by: Marc Ferland <ferlandm@amotus.ca>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211116164733.17149-1-ferlandm@amotus.ca
2021-12-01 00:07:25 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* An I2C driver for the PCF85063 RTC
* Copyright 2014 Rose Technology
*
* Author: Søren Andersen <san@rosetechnology.dk>
* Maintainers: http://www.nslu2-linux.org/
*
* Copyright (C) 2019 Micro Crystal AG
* Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
*/
#include <linux/clk-provider.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/regmap.h>
/*
* Information for this driver was pulled from the following datasheets.
*
* https://www.nxp.com/docs/en/data-sheet/PCF85063A.pdf
* https://www.nxp.com/docs/en/data-sheet/PCF85063TP.pdf
*
* PCF85063A -- Rev. 7 — 30 March 2018
* PCF85063TP -- Rev. 4 — 6 May 2015
*
* https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-8263-C7_App-Manual.pdf
* RV8263 -- Rev. 1.0 — January 2019
*/
#define PCF85063_REG_CTRL1 0x00 /* status */
#define PCF85063_REG_CTRL1_CAP_SEL BIT(0)
#define PCF85063_REG_CTRL1_STOP BIT(5)
#define PCF85063_REG_CTRL1_EXT_TEST BIT(7)
#define PCF85063_REG_CTRL2 0x01
#define PCF85063_CTRL2_AF BIT(6)
#define PCF85063_CTRL2_AIE BIT(7)
#define PCF85063_REG_OFFSET 0x02
#define PCF85063_OFFSET_SIGN_BIT 6 /* 2's complement sign bit */
#define PCF85063_OFFSET_MODE BIT(7)
#define PCF85063_OFFSET_STEP0 4340
#define PCF85063_OFFSET_STEP1 4069
#define PCF85063_REG_CLKO_F_MASK 0x07 /* frequency mask */
#define PCF85063_REG_CLKO_F_32768HZ 0x00
#define PCF85063_REG_CLKO_F_OFF 0x07
#define PCF85063_REG_RAM 0x03
#define PCF85063_REG_SC 0x04 /* datetime */
#define PCF85063_REG_SC_OS 0x80
#define PCF85063_REG_ALM_S 0x0b
#define PCF85063_AEN BIT(7)
struct pcf85063_config {
struct regmap_config regmap;
unsigned has_alarms:1;
unsigned force_cap_7000:1;
};
struct pcf85063 {
struct rtc_device *rtc;
struct regmap *regmap;
#ifdef CONFIG_COMMON_CLK
struct clk_hw clkout_hw;
#endif
};
static int pcf85063_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
int rc;
u8 regs[7];
/*
* while reading, the time/date registers are blocked and not updated
* anymore until the access is finished. To not lose a second
* event, the access must be finished within one second. So, read all
* time/date registers in one turn.
*/
rc = regmap_bulk_read(pcf85063->regmap, PCF85063_REG_SC, regs,
sizeof(regs));
if (rc)
return rc;
/* if the clock has lost its power it makes no sense to use its time */
if (regs[0] & PCF85063_REG_SC_OS) {
dev_warn(&pcf85063->rtc->dev, "Power loss detected, invalid time\n");
return -EINVAL;
}
tm->tm_sec = bcd2bin(regs[0] & 0x7F);
tm->tm_min = bcd2bin(regs[1] & 0x7F);
tm->tm_hour = bcd2bin(regs[2] & 0x3F); /* rtc hr 0-23 */
tm->tm_mday = bcd2bin(regs[3] & 0x3F);
tm->tm_wday = regs[4] & 0x07;
tm->tm_mon = bcd2bin(regs[5] & 0x1F) - 1; /* rtc mn 1-12 */
tm->tm_year = bcd2bin(regs[6]);
tm->tm_year += 100;
return 0;
}
static int pcf85063_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
int rc;
u8 regs[7];
/*
* to accurately set the time, reset the divider chain and keep it in
* reset state until all time/date registers are written
*/
rc = regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
PCF85063_REG_CTRL1_EXT_TEST |
PCF85063_REG_CTRL1_STOP,
PCF85063_REG_CTRL1_STOP);
if (rc)
return rc;
/* hours, minutes and seconds */
regs[0] = bin2bcd(tm->tm_sec) & 0x7F; /* clear OS flag */
regs[1] = bin2bcd(tm->tm_min);
regs[2] = bin2bcd(tm->tm_hour);
/* Day of month, 1 - 31 */
regs[3] = bin2bcd(tm->tm_mday);
/* Day, 0 - 6 */
regs[4] = tm->tm_wday & 0x07;
/* month, 1 - 12 */
regs[5] = bin2bcd(tm->tm_mon + 1);
/* year and century */
regs[6] = bin2bcd(tm->tm_year - 100);
/* write all registers at once */
rc = regmap_bulk_write(pcf85063->regmap, PCF85063_REG_SC,
regs, sizeof(regs));
if (rc)
return rc;
/*
* Write the control register as a separate action since the size of
* the register space is different between the PCF85063TP and
* PCF85063A devices. The rollover point can not be used.
*/
return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
PCF85063_REG_CTRL1_STOP, 0);
}
static int pcf85063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
u8 buf[4];
unsigned int val;
int ret;
ret = regmap_bulk_read(pcf85063->regmap, PCF85063_REG_ALM_S,
buf, sizeof(buf));
if (ret)
return ret;
alrm->time.tm_sec = bcd2bin(buf[0]);
alrm->time.tm_min = bcd2bin(buf[1]);
alrm->time.tm_hour = bcd2bin(buf[2]);
alrm->time.tm_mday = bcd2bin(buf[3]);
ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &val);
if (ret)
return ret;
alrm->enabled = !!(val & PCF85063_CTRL2_AIE);
return 0;
}
static int pcf85063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
u8 buf[5];
int ret;
buf[0] = bin2bcd(alrm->time.tm_sec);
buf[1] = bin2bcd(alrm->time.tm_min);
buf[2] = bin2bcd(alrm->time.tm_hour);
buf[3] = bin2bcd(alrm->time.tm_mday);
buf[4] = PCF85063_AEN; /* Do not match on week day */
ret = regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF, 0);
if (ret)
return ret;
ret = regmap_bulk_write(pcf85063->regmap, PCF85063_REG_ALM_S,
buf, sizeof(buf));
if (ret)
return ret;
return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF,
alrm->enabled ? PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF : PCF85063_CTRL2_AF);
}
static int pcf85063_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
PCF85063_CTRL2_AIE,
enabled ? PCF85063_CTRL2_AIE : 0);
}
static irqreturn_t pcf85063_rtc_handle_irq(int irq, void *dev_id)
{
struct pcf85063 *pcf85063 = dev_id;
unsigned int val;
int err;
err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &val);
if (err)
return IRQ_NONE;
if (val & PCF85063_CTRL2_AF) {
rtc_update_irq(pcf85063->rtc, 1, RTC_IRQF | RTC_AF);
regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF,
0);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int pcf85063_read_offset(struct device *dev, long *offset)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
long val;
u32 reg;
int ret;
ret = regmap_read(pcf85063->regmap, PCF85063_REG_OFFSET, &reg);
if (ret < 0)
return ret;
val = sign_extend32(reg & ~PCF85063_OFFSET_MODE,
PCF85063_OFFSET_SIGN_BIT);
if (reg & PCF85063_OFFSET_MODE)
*offset = val * PCF85063_OFFSET_STEP1;
else
*offset = val * PCF85063_OFFSET_STEP0;
return 0;
}
static int pcf85063_set_offset(struct device *dev, long offset)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
s8 mode0, mode1, reg;
unsigned int error0, error1;
if (offset > PCF85063_OFFSET_STEP0 * 63)
return -ERANGE;
if (offset < PCF85063_OFFSET_STEP0 * -64)
return -ERANGE;
mode0 = DIV_ROUND_CLOSEST(offset, PCF85063_OFFSET_STEP0);
mode1 = DIV_ROUND_CLOSEST(offset, PCF85063_OFFSET_STEP1);
error0 = abs(offset - (mode0 * PCF85063_OFFSET_STEP0));
error1 = abs(offset - (mode1 * PCF85063_OFFSET_STEP1));
if (mode1 > 63 || mode1 < -64 || error0 < error1)
reg = mode0 & ~PCF85063_OFFSET_MODE;
else
reg = mode1 | PCF85063_OFFSET_MODE;
return regmap_write(pcf85063->regmap, PCF85063_REG_OFFSET, reg);
}
static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
int status, ret = 0;
switch (cmd) {
case RTC_VL_READ:
ret = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &status);
if (ret < 0)
return ret;
status = (status & PCF85063_REG_SC_OS) ? RTC_VL_DATA_INVALID : 0;
return put_user(status, (unsigned int __user *)arg);
default:
return -ENOIOCTLCMD;
}
}
static const struct rtc_class_ops pcf85063_rtc_ops = {
.read_time = pcf85063_rtc_read_time,
.set_time = pcf85063_rtc_set_time,
.read_offset = pcf85063_read_offset,
.set_offset = pcf85063_set_offset,
.read_alarm = pcf85063_rtc_read_alarm,
.set_alarm = pcf85063_rtc_set_alarm,
.alarm_irq_enable = pcf85063_rtc_alarm_irq_enable,
.ioctl = pcf85063_ioctl,
};
static int pcf85063_nvmem_read(void *priv, unsigned int offset,
void *val, size_t bytes)
{
return regmap_read(priv, PCF85063_REG_RAM, val);
}
static int pcf85063_nvmem_write(void *priv, unsigned int offset,
void *val, size_t bytes)
{
return regmap_write(priv, PCF85063_REG_RAM, *(u8 *)val);
}
static int pcf85063_load_capacitance(struct pcf85063 *pcf85063,
const struct device_node *np,
unsigned int force_cap)
{
u32 load = 7000;
u8 reg = 0;
if (force_cap)
load = force_cap;
else
of_property_read_u32(np, "quartz-load-femtofarads", &load);
switch (load) {
default:
dev_warn(&pcf85063->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
load);
fallthrough;
case 7000:
break;
case 12500:
reg = PCF85063_REG_CTRL1_CAP_SEL;
break;
}
return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
PCF85063_REG_CTRL1_CAP_SEL, reg);
}
#ifdef CONFIG_COMMON_CLK
/*
* Handling of the clkout
*/
#define clkout_hw_to_pcf85063(_hw) container_of(_hw, struct pcf85063, clkout_hw)
static int clkout_rates[] = {
32768,
16384,
8192,
4096,
2048,
1024,
1,
0
};
static unsigned long pcf85063_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
unsigned int buf;
int ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
if (ret < 0)
return 0;
buf &= PCF85063_REG_CLKO_F_MASK;
return clkout_rates[buf];
}
static long pcf85063_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
int i;
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
if (clkout_rates[i] <= rate)
return clkout_rates[i];
return 0;
}
static int pcf85063_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
int i;
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
if (clkout_rates[i] == rate)
return regmap_update_bits(pcf85063->regmap,
PCF85063_REG_CTRL2,
PCF85063_REG_CLKO_F_MASK, i);
return -EINVAL;
}
static int pcf85063_clkout_control(struct clk_hw *hw, bool enable)
{
struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
unsigned int buf;
int ret;
ret = regmap_read(pcf85063->regmap, PCF85063_REG_OFFSET, &buf);
if (ret < 0)
return ret;
buf &= PCF85063_REG_CLKO_F_MASK;
if (enable) {
if (buf == PCF85063_REG_CLKO_F_OFF)
buf = PCF85063_REG_CLKO_F_32768HZ;
else
return 0;
} else {
if (buf != PCF85063_REG_CLKO_F_OFF)
buf = PCF85063_REG_CLKO_F_OFF;
else
return 0;
}
return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
PCF85063_REG_CLKO_F_MASK, buf);
}
static int pcf85063_clkout_prepare(struct clk_hw *hw)
{
return pcf85063_clkout_control(hw, 1);
}
static void pcf85063_clkout_unprepare(struct clk_hw *hw)
{
pcf85063_clkout_control(hw, 0);
}
static int pcf85063_clkout_is_prepared(struct clk_hw *hw)
{
struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
unsigned int buf;
int ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
if (ret < 0)
return 0;
return (buf & PCF85063_REG_CLKO_F_MASK) != PCF85063_REG_CLKO_F_OFF;
}
static const struct clk_ops pcf85063_clkout_ops = {
.prepare = pcf85063_clkout_prepare,
.unprepare = pcf85063_clkout_unprepare,
.is_prepared = pcf85063_clkout_is_prepared,
.recalc_rate = pcf85063_clkout_recalc_rate,
.round_rate = pcf85063_clkout_round_rate,
.set_rate = pcf85063_clkout_set_rate,
};
static struct clk *pcf85063_clkout_register_clk(struct pcf85063 *pcf85063)
{
struct clk *clk;
struct clk_init_data init;
struct device_node *node = pcf85063->rtc->dev.parent->of_node;
struct device_node *fixed_clock;
fixed_clock = of_get_child_by_name(node, "clock");
if (fixed_clock) {
/*
* skip registering square wave clock when a fixed
* clock has been registered. The fixed clock is
* registered automatically when being referenced.
*/
of_node_put(fixed_clock);
return NULL;
}
init.name = "pcf85063-clkout";
init.ops = &pcf85063_clkout_ops;
init.flags = 0;
init.parent_names = NULL;
init.num_parents = 0;
pcf85063->clkout_hw.init = &init;
/* optional override of the clockname */
of_property_read_string(node, "clock-output-names", &init.name);
/* register the clock */
clk = devm_clk_register(&pcf85063->rtc->dev, &pcf85063->clkout_hw);
if (!IS_ERR(clk))
of_clk_add_provider(node, of_clk_src_simple_get, clk);
return clk;
}
#endif
enum pcf85063_type {
PCF85063,
PCF85063TP,
PCF85063A,
RV8263,
PCF85063_LAST_ID
};
static struct pcf85063_config pcf85063_cfg[] = {
[PCF85063] = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x0a,
},
},
[PCF85063TP] = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x0a,
},
},
[PCF85063A] = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x11,
},
.has_alarms = 1,
},
[RV8263] = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x11,
},
.has_alarms = 1,
.force_cap_7000 = 1,
},
};
static const struct i2c_device_id pcf85063_ids[];
static int pcf85063_probe(struct i2c_client *client)
{
struct pcf85063 *pcf85063;
unsigned int tmp;
int err;
const struct pcf85063_config *config;
struct nvmem_config nvmem_cfg = {
.name = "pcf85063_nvram",
.reg_read = pcf85063_nvmem_read,
.reg_write = pcf85063_nvmem_write,
.type = NVMEM_TYPE_BATTERY_BACKED,
.size = 1,
};
dev_dbg(&client->dev, "%s\n", __func__);
pcf85063 = devm_kzalloc(&client->dev, sizeof(struct pcf85063),
GFP_KERNEL);
if (!pcf85063)
return -ENOMEM;
if (client->dev.of_node) {
config = of_device_get_match_data(&client->dev);
if (!config)
return -ENODEV;
} else {
enum pcf85063_type type =
i2c_match_id(pcf85063_ids, client)->driver_data;
if (type >= PCF85063_LAST_ID)
return -ENODEV;
config = &pcf85063_cfg[type];
}
pcf85063->regmap = devm_regmap_init_i2c(client, &config->regmap);
if (IS_ERR(pcf85063->regmap))
return PTR_ERR(pcf85063->regmap);
i2c_set_clientdata(client, pcf85063);
err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL1, &tmp);
if (err) {
dev_err(&client->dev, "RTC chip is not present\n");
return err;
}
pcf85063->rtc = devm_rtc_allocate_device(&client->dev);
if (IS_ERR(pcf85063->rtc))
return PTR_ERR(pcf85063->rtc);
err = pcf85063_load_capacitance(pcf85063, client->dev.of_node,
config->force_cap_7000 ? 7000 : 0);
if (err < 0)
dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
err);
pcf85063->rtc->ops = &pcf85063_rtc_ops;
pcf85063->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
pcf85063->rtc->range_max = RTC_TIMESTAMP_END_2099;
pcf85063->rtc->uie_unsupported = 1;
clear_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
if (config->has_alarms && client->irq > 0) {
err = devm_request_threaded_irq(&client->dev, client->irq,
NULL, pcf85063_rtc_handle_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"pcf85063", pcf85063);
if (err) {
dev_warn(&pcf85063->rtc->dev,
"unable to request IRQ, alarms disabled\n");
} else {
set_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
device_init_wakeup(&client->dev, true);
err = dev_pm_set_wake_irq(&client->dev, client->irq);
if (err)
dev_err(&pcf85063->rtc->dev,
"failed to enable irq wake\n");
}
}
nvmem_cfg.priv = pcf85063->regmap;
devm_rtc_nvmem_register(pcf85063->rtc, &nvmem_cfg);
#ifdef CONFIG_COMMON_CLK
/* register clk in common clk framework */
pcf85063_clkout_register_clk(pcf85063);
#endif
return devm_rtc_register_device(pcf85063->rtc);
}
static const struct i2c_device_id pcf85063_ids[] = {
{ "pcf85063", PCF85063 },
{ "pcf85063tp", PCF85063TP },
{ "pcf85063a", PCF85063A },
{ "rv8263", RV8263 },
{}
};
MODULE_DEVICE_TABLE(i2c, pcf85063_ids);
#ifdef CONFIG_OF
static const struct of_device_id pcf85063_of_match[] = {
{ .compatible = "nxp,pcf85063", .data = &pcf85063_cfg[PCF85063] },
{ .compatible = "nxp,pcf85063tp", .data = &pcf85063_cfg[PCF85063TP] },
{ .compatible = "nxp,pcf85063a", .data = &pcf85063_cfg[PCF85063A] },
{ .compatible = "microcrystal,rv8263", .data = &pcf85063_cfg[RV8263] },
{}
};
MODULE_DEVICE_TABLE(of, pcf85063_of_match);
#endif
static struct i2c_driver pcf85063_driver = {
.driver = {
.name = "rtc-pcf85063",
.of_match_table = of_match_ptr(pcf85063_of_match),
},
.probe_new = pcf85063_probe,
.id_table = pcf85063_ids,
};
module_i2c_driver(pcf85063_driver);
MODULE_AUTHOR("Søren Andersen <san@rosetechnology.dk>");
MODULE_DESCRIPTION("PCF85063 RTC driver");
MODULE_LICENSE("GPL");
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