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Diffstat (limited to 'drivers/power/supply/bq27xxx_battery_hdq.c')
-rw-r--r--drivers/power/supply/bq27xxx_battery_hdq.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/power/supply/bq27xxx_battery_hdq.c b/drivers/power/supply/bq27xxx_battery_hdq.c
new file mode 100644
index 000000000..922759ab2
--- /dev/null
+++ b/drivers/power/supply/bq27xxx_battery_hdq.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * BQ27xxx battery monitor HDQ/1-wire driver
+ *
+ * Copyright (C) 2007-2017 Texas Instruments Incorporated - https://www.ti.com/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/power/bq27xxx_battery.h>
+
+#include <linux/w1.h>
+
+#define W1_FAMILY_BQ27000 0x01
+
+#define HDQ_CMD_READ (0 << 7)
+#define HDQ_CMD_WRITE (1 << 7)
+
+static int F_ID;
+module_param(F_ID, int, S_IRUSR);
+MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ27xxx device");
+
+static int w1_bq27000_read(struct w1_slave *sl, unsigned int reg)
+{
+ u8 val;
+
+ mutex_lock(&sl->master->bus_mutex);
+ w1_write_8(sl->master, HDQ_CMD_READ | reg);
+ val = w1_read_8(sl->master);
+ mutex_unlock(&sl->master->bus_mutex);
+
+ return val;
+}
+
+static int bq27xxx_battery_hdq_read(struct bq27xxx_device_info *di, u8 reg,
+ bool single)
+{
+ struct w1_slave *sl = dev_to_w1_slave(di->dev);
+ unsigned int timeout = 3;
+ int upper, lower;
+ int temp;
+
+ if (!single) {
+ /*
+ * Make sure the value has not changed in between reading the
+ * lower and the upper part
+ */
+ upper = w1_bq27000_read(sl, reg + 1);
+ do {
+ temp = upper;
+ if (upper < 0)
+ return upper;
+
+ lower = w1_bq27000_read(sl, reg);
+ if (lower < 0)
+ return lower;
+
+ upper = w1_bq27000_read(sl, reg + 1);
+ } while (temp != upper && --timeout);
+
+ if (timeout == 0)
+ return -EIO;
+
+ return (upper << 8) | lower;
+ }
+
+ return w1_bq27000_read(sl, reg);
+}
+
+static int bq27xxx_battery_hdq_add_slave(struct w1_slave *sl)
+{
+ struct bq27xxx_device_info *di;
+
+ di = devm_kzalloc(&sl->dev, sizeof(*di), GFP_KERNEL);
+ if (!di)
+ return -ENOMEM;
+
+ dev_set_drvdata(&sl->dev, di);
+
+ di->dev = &sl->dev;
+ di->chip = BQ27000;
+ di->name = "bq27000-battery";
+ di->bus.read = bq27xxx_battery_hdq_read;
+
+ return bq27xxx_battery_setup(di);
+}
+
+static void bq27xxx_battery_hdq_remove_slave(struct w1_slave *sl)
+{
+ struct bq27xxx_device_info *di = dev_get_drvdata(&sl->dev);
+
+ bq27xxx_battery_teardown(di);
+}
+
+static const struct w1_family_ops bq27xxx_battery_hdq_fops = {
+ .add_slave = bq27xxx_battery_hdq_add_slave,
+ .remove_slave = bq27xxx_battery_hdq_remove_slave,
+};
+
+static struct w1_family bq27xxx_battery_hdq_family = {
+ .fid = W1_FAMILY_BQ27000,
+ .fops = &bq27xxx_battery_hdq_fops,
+};
+
+static int __init bq27xxx_battery_hdq_init(void)
+{
+ if (F_ID)
+ bq27xxx_battery_hdq_family.fid = F_ID;
+
+ return w1_register_family(&bq27xxx_battery_hdq_family);
+}
+module_init(bq27xxx_battery_hdq_init);
+
+static void __exit bq27xxx_battery_hdq_exit(void)
+{
+ w1_unregister_family(&bq27xxx_battery_hdq_family);
+}
+module_exit(bq27xxx_battery_hdq_exit);
+
+MODULE_AUTHOR("Texas Instruments Ltd");
+MODULE_DESCRIPTION("BQ27xxx battery monitor HDQ/1-wire driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));