rtc: rv3029: Add device tree property for trickle charger (e27e2160) · Commits · 戴 / test

drivers/rtc/rtc-rv3029c2.c

+103 −3

Original line number	Diff line number	Diff line
		@@ -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);

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