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authorSyed Rafiuddin <srafiuddin@nvidia.com>2012-01-31 17:10:37 +0530
committerSimone Willett <swillett@nvidia.com>2012-02-09 12:52:28 -0800
commit385778bfee40e5925128ccd5186276c32ef252f2 (patch)
tree79caa59890e4eea4998daef129b5b48b898a7356 /drivers/power
parent180aca790eca8dfdce94e84f61b35dfabc00a6f4 (diff)
power: smb349: smb349 charger driver
Smb349 battery charger driver for kai platform. Signed-off-by: Syed Rafiuddin <srafiuddin@nvidia.com> Reviewed-on: http://git-master/r/78211 (cherry picked from commit f059c9db2735a6e0088dd9cd61a623b13b5d717e) Change-Id: Ifa401713928d29bb4235353e50b66e632c7625ba Signed-off-by: Pritesh Raithatha <praithatha@nvidia.com> Reviewed-on: http://git-master/r/79980 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com> Tested-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/smb349-charger.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/drivers/power/smb349-charger.c b/drivers/power/smb349-charger.c
new file mode 100644
index 000000000000..b3db989fa070
--- /dev/null
+++ b/drivers/power/smb349-charger.c
@@ -0,0 +1,283 @@
+/*
+ * drivers/power/smb349-charger.c
+ *
+ * Battery charger driver for smb349 from summit microelectronics
+ *
+ * Copyright (c) 2012, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/power_supply.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/smb349-charger.h>
+#include <linux/slab.h>
+
+#define SMB349_CHARGE 0x00
+#define SMB349_CHRG_CRNTS 0x01
+#define SMB349_VRS_FUNC 0x02
+#define SMB349_FLOAT_VLTG 0x03
+#define SMB349_CHRG_CTRL 0x04
+#define SMB349_STAT_TIME_CTRL 0x05
+#define SMB349_PIN_CTRL 0x06
+#define SMB349_THERM_CTRL 0x07
+#define SMB349_CTRL_REG 0x09
+
+#define SMB349_OTG_TLIM_REG 0x0A
+#define SMB349_HRD_SFT_TEMP 0x0B
+#define SMB349_FAULT_INTR 0x0C
+#define SMB349_STS_INTR_1 0x0D
+#define SMB349_SYSOK_USB3 0x0E
+#define SMB349_IN_CLTG_DET 0x10
+#define SMB349_STS_INTR_2 0x11
+
+#define SMB349_CMD_REG 0x30
+#define SMB349_CMD_REG_B 0x31
+#define SMB349_CMD_REG_c 0x33
+
+#define SMB349_INTR_STS_A 0x35
+#define SMB349_INTR_STS_B 0x36
+#define SMB349_INTR_STS_C 0x37
+#define SMB349_INTR_STS_D 0x38
+#define SMB349_INTR_STS_E 0x39
+#define SMB349_INTR_STS_F 0x3A
+
+#define SMB349_STS_REG_A 0x3B
+#define SMB349_STS_REG_B 0x3C
+#define SMB349_STS_REG_C 0x3D
+#define SMB349_STS_REG_D 0x3E
+#define SMB349_STS_REG_E 0x3F
+
+#define ENABLE_WRT_ACCESS 0x80
+#define THERM_CTRL 0x10
+#define BATTERY_MISSING 0x10
+#define CHARGING 0x06
+#define DEDICATED_CHARGER 0x04
+#define ENABLE_CHARGE 0x02
+
+static struct smb349_charger *charger;
+
+static int smb349_read(struct i2c_client *client, int reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static int smb349_write(struct i2c_client *client, int reg, u8 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static int smb349_update_reg(struct i2c_client *client, int reg, u8 value)
+{
+ int ret, retval;
+
+ retval = smb349_read(client, reg);
+ if (retval < 0) {
+ dev_err(&client->dev, "%s: err %d\n", __func__, retval);
+ return retval;
+ }
+
+ ret = smb349_write(client, reg, retval | value);
+ if (ret < 0) {
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+int smb349_volatile_writes(struct i2c_client *client)
+{
+ int ret = 0;
+
+ /* Enable volatile write to config registers*/
+ ret = smb349_update_reg(client, SMB349_CMD_REG, ENABLE_WRT_ACCESS);
+ if (ret < 0) {
+ dev_err(&client->dev, "%s(): Failed in writing register"
+ "0x%02x\n", __func__, SMB349_CMD_REG);
+ return ret;
+ }
+
+ return ret;
+}
+
+int smb349_battery_online(void)
+{
+ int val;
+ struct i2c_client *client = charger->client;
+
+ val = smb349_read(charger->client, SMB349_INTR_STS_B);
+ if (val < 0) {
+ dev_err(&client->dev, "%s(): Failed in reading register"
+ "0x%02x\n", __func__, SMB349_INTR_STS_B);
+ return val;
+ }
+ if (val & BATTERY_MISSING)
+ return 0;
+ else
+ return 1;
+}
+EXPORT_SYMBOL_GPL(smb349_battery_online);
+
+int smb349_charging_status(void)
+{
+ int val;
+ struct i2c_client *client = charger->client;
+
+ val = smb349_read(charger->client, SMB349_STS_REG_C);
+ if (val < 0) {
+ dev_err(&client->dev, "%s(): Failed in reading register"
+ "0x%02x\n", __func__, SMB349_STS_REG_C);
+ return val;
+ }
+ if (val & CHARGING)
+ return 1;
+ else
+ return 0;
+}
+EXPORT_SYMBOL_GPL(smb349_charging_status);
+
+int smb349_charger_type(void)
+{
+ int val;
+ struct i2c_client *client = charger->client;
+
+ val = smb349_read(charger->client, SMB349_STS_REG_D);
+ if (val < 0) {
+ dev_err(&client->dev, "%s(): Failed in reading register"
+ "0x%02x\n", __func__, SMB349_STS_REG_D);
+ return val;
+ }
+ if (val & DEDICATED_CHARGER)
+ return 1;
+ else
+ return 0;
+
+}
+EXPORT_SYMBOL_GPL(smb349_charger_type);
+
+static int __devinit smb349_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ int ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ charger = kzalloc(sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ charger->client = client;
+ charger->dev = &client->dev;
+ i2c_set_clientdata(client, charger);
+
+ /* Check battery presence*/
+ if (!smb349_battery_online()) {
+ dev_err(&client->dev, "%s() No Battery present, exiting..\n",
+ __func__);
+ goto error;
+ }
+
+ /*Enable volatile writes to registers*/
+ ret = smb349_volatile_writes(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "%s() error in configuring charger..\n",
+ __func__);
+ goto error;
+ }
+
+ /* Configure THERM ctrl*/
+ smb349_update_reg(client, SMB349_THERM_CTRL, THERM_CTRL);
+ if (ret < 0) {
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+ goto error;
+ }
+
+ /* Enable charging*/
+ ret = smb349_update_reg(client, SMB349_CMD_REG, ENABLE_CHARGE);
+ if (ret < 0) {
+ dev_err(&client->dev, "%s(): Failed in writing register"
+ "0x%02x\n", __func__, SMB349_CMD_REG);
+ goto error;
+ }
+
+ return 0;
+error:
+ kfree(charger);
+ return ret;
+}
+
+static int __devexit smb349_remove(struct i2c_client *client)
+{
+ struct smb349_charger *charger = i2c_get_clientdata(client);
+
+ kfree(charger);
+ return 0;
+}
+
+static const struct i2c_device_id smb349_id[] = {
+ { "smb349", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, smb349_id);
+
+static struct i2c_driver smb349_i2c_driver = {
+ .driver = {
+ .name = "smb349",
+ },
+ .probe = smb349_probe,
+ .remove = __devexit_p(smb349_remove),
+ .id_table = smb349_id,
+};
+
+static int __init smb349_init(void)
+{
+ return i2c_add_driver(&smb349_i2c_driver);
+}
+module_init(smb349_init);
+
+static void __exit smb349_exit(void)
+{
+ i2c_del_driver(&smb349_i2c_driver);
+}
+module_exit(smb349_exit);
+
+MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
+MODULE_DESCRIPTION("SMB349 Battery-Charger");
+MODULE_LICENSE("GPL");