@@ -10,9 +10,6 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * NOTE: Currently this driver only supports the bare minimum for read
- * and write the RTC and alarms. The extra features provided by this chip
- * (trickle charger, eeprom, T° compensation) are unavailable.
*/
#include <linux/module.h>
@@ -528,6 +525,107 @@ static int rv3029_rtc_set_time(struct device *dev, struct rtc_time *tm)
return rv3029_i2c_set_time(to_i2c_client(dev), tm);
}
+static const struct rv3029_trickle_tab_elem {
+ u32 r; /* resistance in ohms */
+ u8 conf; /* trickle config bits */
+} rv3029_trickle_tab[] = {
+ {
+ .r = 1076,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+ RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 1091,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+ RV3029_TRICKLE_20K,
+ }, {
+ .r = 1137,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+ RV3029_TRICKLE_80K,
+ }, {
+ .r = 1154,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
+ }, {
+ .r = 1371,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
+ RV3029_TRICKLE_80K,
+ }, {
+ .r = 1395,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
+ }, {
+ .r = 1472,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 1500,
+ .conf = RV3029_TRICKLE_1K,
+ }, {
+ .r = 3810,
+ .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
+ RV3029_TRICKLE_80K,
+ }, {
+ .r = 4000,
+ .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
+ }, {
+ .r = 4706,
+ .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 5000,
+ .conf = RV3029_TRICKLE_5K,
+ }, {
+ .r = 16000,
+ .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 20000,
+ .conf = RV3029_TRICKLE_20K,
+ }, {
+ .r = 80000,
+ .conf = RV3029_TRICKLE_80K,
+ },
+};
+
+static void rv3029_trickle_config(struct i2c_client *client)
+{
+ struct device_node *of_node = client->dev.of_node;
+ const struct rv3029_trickle_tab_elem *elem;
+ int i, err;
+ u32 ohms;
+ u8 eectrl;
+
+ if (!of_node)
+ return;
+
+ /* Configure the trickle charger. */
+ err = rv3029_eeprom_read(client, RV3029_CONTROL_E2P_EECTRL,
+ &eectrl, 1);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "Failed to read trickle charger config\n");
+ return;
+ }
+ err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
+ if (err) {
+ /* Disable trickle charger. */
+ eectrl &= ~RV3029_TRICKLE_MASK;
+ } else {
+ /* Enable trickle charger. */
+ for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
+ elem = &rv3029_trickle_tab[i];
+ if (elem->r >= ohms)
+ break;
+ }
+ eectrl &= ~RV3029_TRICKLE_MASK;
+ eectrl |= elem->conf;
+ dev_info(&client->dev,
+ "Trickle charger enabled at %d ohms resistance.\n",
+ elem->r);
+ }
+ err = rv3029_eeprom_write(client, RV3029_CONTROL_E2P_EECTRL,
+ &eectrl, 1);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "Failed to write trickle charger config\n");
+ }
+}
+
static const struct rtc_class_ops rv3029_rtc_ops = {
.read_time = rv3029_rtc_read_time,
.set_time = rv3029_rtc_set_time,
@@ -558,6 +656,8 @@ static int rv3029_probe(struct i2c_client *client,
return rc;
}
+ rv3029_trickle_config(client);
+
rtc = devm_rtc_device_register(&client->dev, client->name,
&rv3029_rtc_ops, THIS_MODULE);
The trickle charger resistor can be enabled via device tree property trickle-resistor-ohms. Signed-off-by: Michael Buesch <m@bues.ch> --- drivers/rtc/rtc-rv3029c2.c | 106 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 103 insertions(+), 3 deletions(-)