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path: root/drivers/rtc/rtc-isl1208.c
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Diffstat (limited to 'drivers/rtc/rtc-isl1208.c')
-rw-r--r--drivers/rtc/rtc-isl1208.c192
1 files changed, 169 insertions, 23 deletions
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 1a2c38cc0178..ea18a8f4bce0 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -14,6 +14,8 @@
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
+#include "rtc-core.h"
+#include <linux/of_irq.h>
/* Register map */
/* rtc section */
@@ -33,13 +35,16 @@
#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
+#define ISL1208_REG_SR_EVT (1<<3) /* event */
#define ISL1208_REG_SR_ALM (1<<2) /* alarm */
#define ISL1208_REG_SR_BAT (1<<1) /* battery */
#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
#define ISL1208_REG_INT 0x08
#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
-#define ISL1208_REG_09 0x09 /* reserved */
+#define ISL1219_REG_EV 0x09
+#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */
+#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */
#define ISL1208_REG_ATR 0x0a
#define ISL1208_REG_DTR 0x0b
@@ -57,8 +62,24 @@
#define ISL1208_REG_USR2 0x13
#define ISL1208_USR_SECTION_LEN 2
+/* event section */
+#define ISL1219_REG_SCT 0x14
+#define ISL1219_REG_MNT 0x15
+#define ISL1219_REG_HRT 0x16
+#define ISL1219_REG_DTT 0x17
+#define ISL1219_REG_MOT 0x18
+#define ISL1219_REG_YRT 0x19
+#define ISL1219_EVT_SECTION_LEN 6
+
static struct i2c_driver isl1208_driver;
+/* ISL1208 various variants */
+enum {
+ TYPE_ISL1208 = 0,
+ TYPE_ISL1218,
+ TYPE_ISL1219,
+};
+
/* block read */
static int
isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
@@ -80,8 +101,8 @@ isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
};
int ret;
- BUG_ON(reg > ISL1208_REG_USR2);
- BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
+ WARN_ON(reg > ISL1219_REG_YRT);
+ WARN_ON(reg + len > ISL1219_REG_YRT + 1);
ret = i2c_transfer(client->adapter, msgs, 2);
if (ret > 0)
@@ -104,8 +125,8 @@ isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
};
int ret;
- BUG_ON(reg > ISL1208_REG_USR2);
- BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
+ WARN_ON(reg > ISL1219_REG_YRT);
+ WARN_ON(reg + len > ISL1219_REG_YRT + 1);
i2c_buf[0] = reg;
memcpy(&i2c_buf[1], &buf[0], len);
@@ -493,6 +514,73 @@ isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
}
+static ssize_t timestamp0_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = dev_get_drvdata(dev);
+ int sr;
+
+ sr = isl1208_i2c_get_sr(client);
+ if (sr < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return sr;
+ }
+
+ sr &= ~ISL1208_REG_SR_EVT;
+
+ sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
+ if (sr < 0)
+ dev_err(dev, "%s: writing SR failed\n",
+ __func__);
+
+ return count;
+};
+
+static ssize_t timestamp0_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = dev_get_drvdata(dev);
+ u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };
+ struct rtc_time tm;
+ int sr;
+
+ sr = isl1208_i2c_get_sr(client);
+ if (sr < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return sr;
+ }
+
+ if (!(sr & ISL1208_REG_SR_EVT))
+ return 0;
+
+ sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs,
+ ISL1219_EVT_SECTION_LEN);
+ if (sr < 0) {
+ dev_err(dev, "%s: reading event section failed\n",
+ __func__);
+ return 0;
+ }
+
+ /* MSB of each alarm register is an enable bit */
+ tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f);
+ tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f);
+ tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f);
+ tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f);
+ tm.tm_mon =
+ bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1;
+ tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100;
+
+ sr = rtc_valid_tm(&tm);
+ if (sr)
+ return sr;
+
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)rtc_tm_to_time64(&tm));
+};
+
+static DEVICE_ATTR_RW(timestamp0);
+
static irqreturn_t
isl1208_rtc_interrupt(int irq, void *data)
{
@@ -538,6 +626,13 @@ isl1208_rtc_interrupt(int irq, void *data)
return err;
}
+ if (sr & ISL1208_REG_SR_EVT) {
+ sysfs_notify(&rtc->dev.kobj, NULL,
+ dev_attr_timestamp0.attr.name);
+ dev_warn(&client->dev, "event detected");
+ handled = 1;
+ }
+
return handled ? IRQ_HANDLED : IRQ_NONE;
}
@@ -623,11 +718,39 @@ static const struct attribute_group isl1208_rtc_sysfs_files = {
.attrs = isl1208_rtc_attrs,
};
+static struct attribute *isl1219_rtc_attrs[] = {
+ &dev_attr_timestamp0.attr,
+ NULL
+};
+
+static const struct attribute_group isl1219_rtc_sysfs_files = {
+ .attrs = isl1219_rtc_attrs,
+};
+
+static int isl1208_setup_irq(struct i2c_client *client, int irq)
+{
+ int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
+ isl1208_rtc_interrupt,
+ IRQF_SHARED | IRQF_ONESHOT,
+ isl1208_driver.driver.name,
+ client);
+ if (!rc) {
+ device_init_wakeup(&client->dev, 1);
+ enable_irq_wake(irq);
+ } else {
+ dev_err(&client->dev,
+ "Unable to request irq %d, no alarm support\n",
+ irq);
+ }
+ return rc;
+}
+
static int
isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
int rc = 0;
struct rtc_device *rtc;
+ int evdet_irq = -1;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
@@ -642,6 +765,7 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
rtc->ops = &isl1208_rtc_ops;
i2c_set_clientdata(client, rtc);
+ dev_set_drvdata(&rtc->dev, client);
rc = isl1208_i2c_get_sr(client);
if (rc < 0) {
@@ -653,26 +777,46 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
dev_warn(&client->dev, "rtc power failure detected, "
"please set clock.\n");
+ if (id->driver_data == TYPE_ISL1219) {
+ struct device_node *np = client->dev.of_node;
+ u32 evienb;
+
+ rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);
+ if (rc < 0) {
+ dev_err(&client->dev, "failed to read EV reg\n");
+ return rc;
+ }
+ rc |= ISL1219_REG_EV_EVEN;
+ if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {
+ if (evienb)
+ rc |= ISL1219_REG_EV_EVIENB;
+ else
+ rc &= ~ISL1219_REG_EV_EVIENB;
+ }
+ rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);
+ if (rc < 0) {
+ dev_err(&client->dev, "could not enable tamper detection\n");
+ return rc;
+ }
+ rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files);
+ if (rc)
+ return rc;
+ evdet_irq = of_irq_get_byname(np, "evdet");
+ }
+
rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
if (rc)
return rc;
- if (client->irq > 0) {
- rc = devm_request_threaded_irq(&client->dev, client->irq, NULL,
- isl1208_rtc_interrupt,
- IRQF_SHARED | IRQF_ONESHOT,
- isl1208_driver.driver.name,
- client);
- if (!rc) {
- device_init_wakeup(&client->dev, 1);
- enable_irq_wake(client->irq);
- } else {
- dev_err(&client->dev,
- "Unable to request irq %d, no alarm support\n",
- client->irq);
- client->irq = 0;
- }
- }
+ if (client->irq > 0)
+ rc = isl1208_setup_irq(client, client->irq);
+ if (rc)
+ return rc;
+
+ if (evdet_irq > 0 && evdet_irq != client->irq)
+ rc = isl1208_setup_irq(client, evdet_irq);
+ if (rc)
+ return rc;
return rtc_register_device(rtc);
}
@@ -686,8 +830,9 @@ isl1208_remove(struct i2c_client *client)
}
static const struct i2c_device_id isl1208_id[] = {
- { "isl1208", 0 },
- { "isl1218", 0 },
+ { "isl1208", TYPE_ISL1208 },
+ { "isl1218", TYPE_ISL1218 },
+ { "isl1219", TYPE_ISL1219 },
{ }
};
MODULE_DEVICE_TABLE(i2c, isl1208_id);
@@ -695,6 +840,7 @@ MODULE_DEVICE_TABLE(i2c, isl1208_id);
static const struct of_device_id isl1208_of_match[] = {
{ .compatible = "isil,isl1208" },
{ .compatible = "isil,isl1218" },
+ { .compatible = "isil,isl1219" },
{ }
};
MODULE_DEVICE_TABLE(of, isl1208_of_match);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 20:39:44 +0000