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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.c167
1 files changed, 130 insertions, 37 deletions
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 37ab3e1d25f5..471e395b20db 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -13,6 +13,7 @@
#include <linux/bcd.h>
#include <linux/i2c.h>
#include <linux/module.h>
+#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/rtc.h>
@@ -73,10 +74,50 @@
static struct i2c_driver isl1208_driver;
/* ISL1208 various variants */
-enum {
+enum isl1208_id {
TYPE_ISL1208 = 0,
+ TYPE_ISL1209,
TYPE_ISL1218,
TYPE_ISL1219,
+ ISL_LAST_ID
+};
+
+/* Chip capabilities table */
+static const struct isl1208_config {
+ const char name[8];
+ unsigned int nvmem_length;
+ unsigned has_tamper:1;
+ unsigned has_timestamp:1;
+} isl1208_configs[] = {
+ [TYPE_ISL1208] = { "isl1208", 2, false, false },
+ [TYPE_ISL1209] = { "isl1209", 2, true, false },
+ [TYPE_ISL1218] = { "isl1218", 8, false, false },
+ [TYPE_ISL1219] = { "isl1219", 2, true, true },
+};
+
+static const struct i2c_device_id isl1208_id[] = {
+ { "isl1208", TYPE_ISL1208 },
+ { "isl1209", TYPE_ISL1209 },
+ { "isl1218", TYPE_ISL1218 },
+ { "isl1219", TYPE_ISL1219 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, isl1208_id);
+
+static const struct of_device_id isl1208_of_match[] = {
+ { .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] },
+ { .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] },
+ { .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] },
+ { .compatible = "isil,isl1219", .data = &isl1208_configs[TYPE_ISL1219] },
+ { }
+};
+MODULE_DEVICE_TABLE(of, isl1208_of_match);
+
+/* Device state */
+struct isl1208_state {
+ struct nvmem_config nvmem_config;
+ struct rtc_device *rtc;
+ const struct isl1208_config *config;
};
/* block read */
@@ -161,6 +202,7 @@ isl1208_i2c_get_atr(struct i2c_client *client)
return atr;
}
+/* returns adjustment value + 100 */
static int
isl1208_i2c_get_dtr(struct i2c_client *client)
{
@@ -171,7 +213,7 @@ isl1208_i2c_get_dtr(struct i2c_client *client)
/* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
- return dtr;
+ return dtr + 100;
}
static int
@@ -248,8 +290,8 @@ isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
(sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
dtr = isl1208_i2c_get_dtr(client);
- if (dtr >= 0 - 1)
- seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
+ if (dtr >= 0)
+ seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100);
atr = isl1208_i2c_get_atr(client);
if (atr >= 0)
@@ -556,7 +598,7 @@ isl1208_rtc_interrupt(int irq, void *data)
{
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
struct i2c_client *client = data;
- struct rtc_device *rtc = i2c_get_clientdata(client);
+ struct isl1208_state *isl1208 = i2c_get_clientdata(client);
int handled = 0, sr, err;
/*
@@ -579,7 +621,7 @@ isl1208_rtc_interrupt(int irq, void *data)
if (sr & ISL1208_REG_SR_ALM) {
dev_dbg(&client->dev, "alarm!\n");
- rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+ rtc_update_irq(isl1208->rtc, 1, RTC_IRQF | RTC_AF);
/* Clear the alarm */
sr &= ~ISL1208_REG_SR_ALM;
@@ -596,11 +638,12 @@ 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);
+ if (isl1208->config->has_tamper && (sr & ISL1208_REG_SR_EVT)) {
dev_warn(&client->dev, "event detected");
handled = 1;
+ if (isl1208->config->has_timestamp)
+ sysfs_notify(&isl1208->rtc->dev.kobj, NULL,
+ dev_attr_timestamp0.attr.name);
}
return handled ? IRQ_HANDLED : IRQ_NONE;
@@ -637,7 +680,7 @@ isl1208_sysfs_show_dtrim(struct device *dev,
if (dtr < 0)
return dtr;
- return sprintf(buf, "%d ppm\n", dtr);
+ return sprintf(buf, "%d ppm\n", dtr - 100);
}
static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
@@ -700,6 +743,46 @@ static const struct attribute_group isl1219_rtc_sysfs_files = {
.attrs = isl1219_rtc_attrs,
};
+static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf,
+ size_t count)
+{
+ struct isl1208_state *isl1208 = priv;
+ struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);
+ int ret;
+
+ /* nvmem sanitizes offset/count for us, but count==0 is possible */
+ if (!count)
+ return count;
+ ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf,
+ count);
+ return ret == 0 ? count : ret;
+}
+
+static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf,
+ size_t count)
+{
+ struct isl1208_state *isl1208 = priv;
+ struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);
+ int ret;
+
+ /* nvmem sanitizes off/count for us, but count==0 is possible */
+ if (!count)
+ return count;
+ ret = isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf,
+ count);
+
+ return ret == 0 ? count : ret;
+}
+
+static const struct nvmem_config isl1208_nvmem_config = {
+ .name = "isl1208_nvram",
+ .word_size = 1,
+ .stride = 1,
+ /* .size from chip specific config */
+ .reg_read = isl1208_nvmem_read,
+ .reg_write = isl1208_nvmem_write,
+};
+
static int isl1208_setup_irq(struct i2c_client *client, int irq)
{
int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
@@ -722,7 +805,7 @@ static int
isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
int rc = 0;
- struct rtc_device *rtc;
+ struct isl1208_state *isl1208;
int evdet_irq = -1;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
@@ -731,13 +814,33 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
if (isl1208_i2c_validate_client(client) < 0)
return -ENODEV;
- rtc = devm_rtc_allocate_device(&client->dev);
- if (IS_ERR(rtc))
- return PTR_ERR(rtc);
+ /* Allocate driver state, point i2c client data to it */
+ isl1208 = devm_kzalloc(&client->dev, sizeof(*isl1208), GFP_KERNEL);
+ if (!isl1208)
+ return -ENOMEM;
+ i2c_set_clientdata(client, isl1208);
+
+ /* Determine which chip we have */
+ if (client->dev.of_node) {
+ isl1208->config = of_device_get_match_data(&client->dev);
+ if (!isl1208->config)
+ return -ENODEV;
+ } else {
+ if (id->driver_data >= ISL_LAST_ID)
+ return -ENODEV;
+ isl1208->config = &isl1208_configs[id->driver_data];
+ }
+
+ isl1208->rtc = devm_rtc_allocate_device(&client->dev);
+ if (IS_ERR(isl1208->rtc))
+ return PTR_ERR(isl1208->rtc);
- rtc->ops = &isl1208_rtc_ops;
+ isl1208->rtc->ops = &isl1208_rtc_ops;
- i2c_set_clientdata(client, rtc);
+ /* Setup nvmem configuration in driver state struct */
+ isl1208->nvmem_config = isl1208_nvmem_config;
+ isl1208->nvmem_config.size = isl1208->config->nvmem_length;
+ isl1208->nvmem_config.priv = isl1208;
rc = isl1208_i2c_get_sr(client);
if (rc < 0) {
@@ -749,7 +852,7 @@ 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) {
+ if (isl1208->config->has_tamper) {
struct device_node *np = client->dev.of_node;
u32 evienb;
@@ -770,13 +873,15 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
dev_err(&client->dev, "could not enable tamper detection\n");
return rc;
}
- rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files);
+ evdet_irq = of_irq_get_byname(np, "evdet");
+ }
+ if (isl1208->config->has_timestamp) {
+ rc = rtc_add_group(isl1208->rtc, &isl1219_rtc_sysfs_files);
if (rc)
return rc;
- evdet_irq = of_irq_get_byname(np, "evdet");
}
- rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files);
+ rc = rtc_add_group(isl1208->rtc, &isl1208_rtc_sysfs_files);
if (rc)
return rc;
@@ -790,24 +895,12 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
if (rc)
return rc;
- return rtc_register_device(rtc);
-}
-
-static const struct i2c_device_id isl1208_id[] = {
- { "isl1208", TYPE_ISL1208 },
- { "isl1218", TYPE_ISL1218 },
- { "isl1219", TYPE_ISL1219 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, isl1208_id);
+ rc = rtc_nvmem_register(isl1208->rtc, &isl1208->nvmem_config);
+ if (rc)
+ return rc;
-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);
+ return rtc_register_device(isl1208->rtc);
+}
static struct i2c_driver isl1208_driver = {
.driver = {
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-01 09:22:54 +0300