linux-kernel - [PATCH 2/3] power: supply: cpcap-battery: Fix battery identification

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Message-Id: <1667332425-12536-3-git-send-email-ivo.g.dimitrov.75@gmail.com>
Date:   Tue,  1 Nov 2022 21:53:44 +0200
From:   Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
To:     sre@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        tony@...mide.com, philipp@...s.xyz,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Subject: [PATCH 2/3] power: supply: cpcap-battery: Fix battery identification

Use the same logic to identify genuine batteries as Android does.

Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
---
 drivers/power/supply/cpcap-battery.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index 2659df7..4cfc325 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -422,7 +422,7 @@ static int cpcap_battery_cc_to_ua(struct cpcap_battery_ddata *ddata,
 
 static int cpcap_battery_match_nvmem(struct device *dev, const void *data)
 {
-	if (strcmp(dev_name(dev), "89-500029ba0f73") == 0)
+	if (strncmp(dev_name(dev), "89-500", 6) == 0)
 		return 1;
 	else
 		return 0;
@@ -439,10 +439,19 @@ static void cpcap_battery_detect_battery_type(struct cpcap_battery_ddata *ddata)
 	if (IS_ERR_OR_NULL(nvmem)) {
 		ddata->check_nvmem = true;
 		dev_info_once(ddata->dev, "Can not find battery nvmem device. Assuming generic lipo battery\n");
-	} else if (nvmem_device_read(nvmem, 2, 1, &battery_id) < 0) {
-		battery_id = 0;
-		ddata->check_nvmem = true;
-		dev_warn(ddata->dev, "Can not read battery nvmem device. Assuming generic lipo battery\n");
+	} else {
+		char buf[24];
+
+		if (nvmem_device_read(nvmem, 96, 4, buf) < 0 ||
+		    strncmp(buf, "COPR", 4) != 0 ||
+		    nvmem_device_read(nvmem, 104, 24, buf) < 0 ||
+		    strncmp(buf, "MOTOROLA E.P CHARGE ONLY", 24) != 0 ||
+		    nvmem_device_read(nvmem, 2, 1, &battery_id) < 0) {
+			battery_id = 0;
+			ddata->check_nvmem = true;
+			dev_warn(ddata->dev, "Can not read battery nvmem device. Assuming generic lipo battery\n");
+		}
+
 	}
 
 	switch (battery_id) {
-- 
1.9.1