mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
ffc75bb8f2
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. This is a cosmetic change to make the code simpler and enhance the readability. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
358 lines
8.9 KiB
C
358 lines
8.9 KiB
C
/*
|
|
* An SPI driver for the Philips PCF2123 RTC
|
|
* Copyright 2009 Cyber Switching, Inc.
|
|
*
|
|
* Author: Chris Verges <chrisv@cyberswitching.com>
|
|
* Maintainers: http://www.cyberswitching.com
|
|
*
|
|
* based on the RS5C348 driver in this same directory.
|
|
*
|
|
* Thanks to Christian Pellegrin <chripell@fsfe.org> for
|
|
* the sysfs contributions to this driver.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Please note that the CS is active high, so platform data
|
|
* should look something like:
|
|
*
|
|
* static struct spi_board_info ek_spi_devices[] = {
|
|
* ...
|
|
* {
|
|
* .modalias = "rtc-pcf2123",
|
|
* .chip_select = 1,
|
|
* .controller_data = (void *)AT91_PIN_PA10,
|
|
* .max_speed_hz = 1000 * 1000,
|
|
* .mode = SPI_CS_HIGH,
|
|
* .bus_num = 0,
|
|
* },
|
|
* ...
|
|
*};
|
|
*
|
|
*/
|
|
|
|
#include <linux/bcd.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
#define DRV_VERSION "0.6"
|
|
|
|
#define PCF2123_REG_CTRL1 (0x00) /* Control Register 1 */
|
|
#define PCF2123_REG_CTRL2 (0x01) /* Control Register 2 */
|
|
#define PCF2123_REG_SC (0x02) /* datetime */
|
|
#define PCF2123_REG_MN (0x03)
|
|
#define PCF2123_REG_HR (0x04)
|
|
#define PCF2123_REG_DM (0x05)
|
|
#define PCF2123_REG_DW (0x06)
|
|
#define PCF2123_REG_MO (0x07)
|
|
#define PCF2123_REG_YR (0x08)
|
|
|
|
#define PCF2123_SUBADDR (1 << 4)
|
|
#define PCF2123_WRITE ((0 << 7) | PCF2123_SUBADDR)
|
|
#define PCF2123_READ ((1 << 7) | PCF2123_SUBADDR)
|
|
|
|
static struct spi_driver pcf2123_driver;
|
|
|
|
struct pcf2123_sysfs_reg {
|
|
struct device_attribute attr;
|
|
char name[2];
|
|
};
|
|
|
|
struct pcf2123_plat_data {
|
|
struct rtc_device *rtc;
|
|
struct pcf2123_sysfs_reg regs[16];
|
|
};
|
|
|
|
/*
|
|
* Causes a 30 nanosecond delay to ensure that the PCF2123 chip select
|
|
* is released properly after an SPI write. This function should be
|
|
* called after EVERY read/write call over SPI.
|
|
*/
|
|
static inline void pcf2123_delay_trec(void)
|
|
{
|
|
ndelay(30);
|
|
}
|
|
|
|
static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr,
|
|
char *buffer)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct pcf2123_sysfs_reg *r;
|
|
u8 txbuf[1], rxbuf[1];
|
|
unsigned long reg;
|
|
int ret;
|
|
|
|
r = container_of(attr, struct pcf2123_sysfs_reg, attr);
|
|
|
|
ret = kstrtoul(r->name, 16, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
txbuf[0] = PCF2123_READ | reg;
|
|
ret = spi_write_then_read(spi, txbuf, 1, rxbuf, 1);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
pcf2123_delay_trec();
|
|
return sprintf(buffer, "0x%x\n", rxbuf[0]);
|
|
}
|
|
|
|
static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buffer, size_t count) {
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct pcf2123_sysfs_reg *r;
|
|
u8 txbuf[2];
|
|
unsigned long reg;
|
|
unsigned long val;
|
|
|
|
int ret;
|
|
|
|
r = container_of(attr, struct pcf2123_sysfs_reg, attr);
|
|
|
|
ret = kstrtoul(r->name, 16, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = kstrtoul(buffer, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
txbuf[0] = PCF2123_WRITE | reg;
|
|
txbuf[1] = val;
|
|
ret = spi_write(spi, txbuf, sizeof(txbuf));
|
|
if (ret < 0)
|
|
return -EIO;
|
|
pcf2123_delay_trec();
|
|
return count;
|
|
}
|
|
|
|
static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
u8 txbuf[1], rxbuf[7];
|
|
int ret;
|
|
|
|
txbuf[0] = PCF2123_READ | PCF2123_REG_SC;
|
|
ret = spi_write_then_read(spi, txbuf, sizeof(txbuf),
|
|
rxbuf, sizeof(rxbuf));
|
|
if (ret < 0)
|
|
return ret;
|
|
pcf2123_delay_trec();
|
|
|
|
tm->tm_sec = bcd2bin(rxbuf[0] & 0x7F);
|
|
tm->tm_min = bcd2bin(rxbuf[1] & 0x7F);
|
|
tm->tm_hour = bcd2bin(rxbuf[2] & 0x3F); /* rtc hr 0-23 */
|
|
tm->tm_mday = bcd2bin(rxbuf[3] & 0x3F);
|
|
tm->tm_wday = rxbuf[4] & 0x07;
|
|
tm->tm_mon = bcd2bin(rxbuf[5] & 0x1F) - 1; /* rtc mn 1-12 */
|
|
tm->tm_year = bcd2bin(rxbuf[6]);
|
|
if (tm->tm_year < 70)
|
|
tm->tm_year += 100; /* assume we are in 1970...2069 */
|
|
|
|
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
|
|
"mday=%d, mon=%d, year=%d, wday=%d\n",
|
|
__func__,
|
|
tm->tm_sec, tm->tm_min, tm->tm_hour,
|
|
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
|
|
|
|
/* the clock can give out invalid datetime, but we cannot return
|
|
* -EINVAL otherwise hwclock will refuse to set the time on bootup.
|
|
*/
|
|
if (rtc_valid_tm(tm) < 0)
|
|
dev_err(dev, "retrieved date/time is not valid.\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
u8 txbuf[8];
|
|
int ret;
|
|
|
|
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
|
|
"mday=%d, mon=%d, year=%d, wday=%d\n",
|
|
__func__,
|
|
tm->tm_sec, tm->tm_min, tm->tm_hour,
|
|
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
|
|
|
|
/* Stop the counter first */
|
|
txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
|
|
txbuf[1] = 0x20;
|
|
ret = spi_write(spi, txbuf, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
pcf2123_delay_trec();
|
|
|
|
/* Set the new time */
|
|
txbuf[0] = PCF2123_WRITE | PCF2123_REG_SC;
|
|
txbuf[1] = bin2bcd(tm->tm_sec & 0x7F);
|
|
txbuf[2] = bin2bcd(tm->tm_min & 0x7F);
|
|
txbuf[3] = bin2bcd(tm->tm_hour & 0x3F);
|
|
txbuf[4] = bin2bcd(tm->tm_mday & 0x3F);
|
|
txbuf[5] = tm->tm_wday & 0x07;
|
|
txbuf[6] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
|
|
txbuf[7] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
|
|
|
|
ret = spi_write(spi, txbuf, sizeof(txbuf));
|
|
if (ret < 0)
|
|
return ret;
|
|
pcf2123_delay_trec();
|
|
|
|
/* Start the counter */
|
|
txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
|
|
txbuf[1] = 0x00;
|
|
ret = spi_write(spi, txbuf, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
pcf2123_delay_trec();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops pcf2123_rtc_ops = {
|
|
.read_time = pcf2123_rtc_read_time,
|
|
.set_time = pcf2123_rtc_set_time,
|
|
};
|
|
|
|
static int pcf2123_probe(struct spi_device *spi)
|
|
{
|
|
struct rtc_device *rtc;
|
|
struct pcf2123_plat_data *pdata;
|
|
u8 txbuf[2], rxbuf[2];
|
|
int ret, i;
|
|
|
|
pdata = devm_kzalloc(&spi->dev, sizeof(struct pcf2123_plat_data),
|
|
GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
spi->dev.platform_data = pdata;
|
|
|
|
/* Send a software reset command */
|
|
txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
|
|
txbuf[1] = 0x58;
|
|
dev_dbg(&spi->dev, "resetting RTC (0x%02X 0x%02X)\n",
|
|
txbuf[0], txbuf[1]);
|
|
ret = spi_write(spi, txbuf, 2 * sizeof(u8));
|
|
if (ret < 0)
|
|
goto kfree_exit;
|
|
pcf2123_delay_trec();
|
|
|
|
/* Stop the counter */
|
|
txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
|
|
txbuf[1] = 0x20;
|
|
dev_dbg(&spi->dev, "stopping RTC (0x%02X 0x%02X)\n",
|
|
txbuf[0], txbuf[1]);
|
|
ret = spi_write(spi, txbuf, 2 * sizeof(u8));
|
|
if (ret < 0)
|
|
goto kfree_exit;
|
|
pcf2123_delay_trec();
|
|
|
|
/* See if the counter was actually stopped */
|
|
txbuf[0] = PCF2123_READ | PCF2123_REG_CTRL1;
|
|
dev_dbg(&spi->dev, "checking for presence of RTC (0x%02X)\n",
|
|
txbuf[0]);
|
|
ret = spi_write_then_read(spi, txbuf, 1 * sizeof(u8),
|
|
rxbuf, 2 * sizeof(u8));
|
|
dev_dbg(&spi->dev, "received data from RTC (0x%02X 0x%02X)\n",
|
|
rxbuf[0], rxbuf[1]);
|
|
if (ret < 0)
|
|
goto kfree_exit;
|
|
pcf2123_delay_trec();
|
|
|
|
if (!(rxbuf[0] & 0x20)) {
|
|
dev_err(&spi->dev, "chip not found\n");
|
|
ret = -ENODEV;
|
|
goto kfree_exit;
|
|
}
|
|
|
|
dev_info(&spi->dev, "chip found, driver version " DRV_VERSION "\n");
|
|
dev_info(&spi->dev, "spiclk %u KHz.\n",
|
|
(spi->max_speed_hz + 500) / 1000);
|
|
|
|
/* Start the counter */
|
|
txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
|
|
txbuf[1] = 0x00;
|
|
ret = spi_write(spi, txbuf, sizeof(txbuf));
|
|
if (ret < 0)
|
|
goto kfree_exit;
|
|
pcf2123_delay_trec();
|
|
|
|
/* Finalize the initialization */
|
|
rtc = devm_rtc_device_register(&spi->dev, pcf2123_driver.driver.name,
|
|
&pcf2123_rtc_ops, THIS_MODULE);
|
|
|
|
if (IS_ERR(rtc)) {
|
|
dev_err(&spi->dev, "failed to register.\n");
|
|
ret = PTR_ERR(rtc);
|
|
goto kfree_exit;
|
|
}
|
|
|
|
pdata->rtc = rtc;
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
sysfs_attr_init(&pdata->regs[i].attr.attr);
|
|
sprintf(pdata->regs[i].name, "%1x", i);
|
|
pdata->regs[i].attr.attr.mode = S_IRUGO | S_IWUSR;
|
|
pdata->regs[i].attr.attr.name = pdata->regs[i].name;
|
|
pdata->regs[i].attr.show = pcf2123_show;
|
|
pdata->regs[i].attr.store = pcf2123_store;
|
|
ret = device_create_file(&spi->dev, &pdata->regs[i].attr);
|
|
if (ret) {
|
|
dev_err(&spi->dev, "Unable to create sysfs %s\n",
|
|
pdata->regs[i].name);
|
|
goto sysfs_exit;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
sysfs_exit:
|
|
for (i--; i >= 0; i--)
|
|
device_remove_file(&spi->dev, &pdata->regs[i].attr);
|
|
|
|
kfree_exit:
|
|
spi->dev.platform_data = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int pcf2123_remove(struct spi_device *spi)
|
|
{
|
|
struct pcf2123_plat_data *pdata = dev_get_platdata(&spi->dev);
|
|
int i;
|
|
|
|
if (pdata) {
|
|
for (i = 0; i < 16; i++)
|
|
if (pdata->regs[i].name[0])
|
|
device_remove_file(&spi->dev,
|
|
&pdata->regs[i].attr);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct spi_driver pcf2123_driver = {
|
|
.driver = {
|
|
.name = "rtc-pcf2123",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = pcf2123_probe,
|
|
.remove = pcf2123_remove,
|
|
};
|
|
|
|
module_spi_driver(pcf2123_driver);
|
|
|
|
MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>");
|
|
MODULE_DESCRIPTION("NXP PCF2123 RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRV_VERSION);
|