bq24022: Add support for the bq2407x family
From: Heiko Stuebner <heiko@...> Date: Sun, 28 Aug 2011 14:47:54 +0200
Commit-Message
The bq2407x family of charger ICs simply supports another machine specific charging current above 500mA. To use this setting a second gpio pin is used while the rest of the pins stay the same. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
Changes since v1: use dev_err instead of dev_dbg in fatal places drivers/regulator/Kconfig | 7 ++-- drivers/regulator/bq24022.c | 65 ++++++++++++++++++++++++++++++++++--- include/linux/regulator/bq24022.h | 7 ++++ 3 files changed, 71 insertions(+), 8 deletions(-)
Statistics
- 71 lines added
- 8 lines removed
Changes
-------------------------- drivers/regulator/Kconfig ---------------------------
index c7fd2c0..546a7a6 100644
@@ -67,10 +67,11 @@ config REGULATOR_USERSPACE_CONSUMER
config REGULATOR_BQ24022
tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC"
help
+ This driver controls a TI bq24022 or bq2407x Charger attached
+ via GPIOs. The provided current regulator can enable/disable
charging select between 100 mA and 500 mA charging current
+ limit. The bq2407x family also supports a machine specific
+ current limit above 500 mA.
config REGULATOR_MAX1586
tristate "Maxim 1586/1587 voltage regulator"
------------------------- drivers/regulator/bq24022.c --------------------------
index b5a6755..ad6942a 100644
@@ -19,15 +19,20 @@
#include <linux/gpio.h>
#include <linux/regulator/bq24022.h>
#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
struct bq24022 {
struct regulator_dev *rdev;
int gpio_nce;
int gpio_iset2;
+ int gpio_2407x_en2;
int state_nce;
int state_iset2;
+ int state_2407x_en2;
+
+ int max_uA;
};
static int bq24022_set_current_limit(struct regulator_dev *rdev,
@@ -35,12 +40,30 @@ static int bq24022_set_current_limit(struct regulator_dev *rdev,
{
struct bq24022 *bq = rdev_get_drvdata(rdev);
+ if (bq->max_uA && bq->max_uA > 500000
+ && max_uA >= bq->max_uA && bq->gpio_2407x_en2) {
+ dev_dbg(rdev_get_dev(rdev),
+ "setting current limit to %d mA\n",
+ bq->max_uA / 1000);
+ gpio_set_value(bq->gpio_2407x_en2, 1);
+ bq->state_2407x_en2 = 1;
+ gpio_set_value(bq->gpio_iset2, 0);
+ bq->state_iset2 = 0;
+ } else if (max_uA >= 100000) {
+ dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA\n",
+ max_uA >= 500000 ? "500" : "100");
+ if (bq->gpio_2407x_en2) {
+ gpio_set_value(bq->gpio_2407x_en2, 0);
+ bq->state_2407x_en2 = 0;
+ }
+ bq->state_iset2 = (max_uA >= 500000);
+ gpio_set_value(bq->gpio_iset2, bq->state_iset2);
+ } else {
+ dev_err(rdev_get_dev(rdev), "cannot set current limit below 100 mA\n");
+ return -EINVAL;
+ }
/* REVISIT: maybe return error if min_uA != 0 ? */
return 0;
}
@@ -48,7 +71,10 @@ static int bq24022_get_current_limit(struct regulator_dev *rdev)
{
struct bq24022 *bq = rdev_get_drvdata(rdev);
+ if (bq->state_2407x_en2)
+ return bq->state_iset2 ? 0 : bq->max_uA;
+ else
+ return bq->state_iset2 ? 500000 : 100000;
}
static int bq24022_enable(struct regulator_dev *rdev)
@@ -122,8 +148,25 @@ static int __init bq24022_probe(struct platform_device *pdev)
pdata->gpio_iset2);
goto err_iset2;
}
+ if (pdata->gpio_2407x_en2) {
+ ret = gpio_request(pdata->gpio_2407x_en2, "charge_mode2");
+ if (ret) {
+ dev_err(&pdev->dev, "couldn't request EN2 GPIO: %d\n",
+ pdata->gpio_2407x_en2);
+ goto err_en2;
+ }
+ }
/* set initial current to 100mA and disable regulator */
+ if (pdata->gpio_2407x_en2) {
+ ret = gpio_direction_output(pdata->gpio_2407x_en2, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "couldn't set EN2 GPIO: %d\n",
+ pdata->gpio_2407x_en2);
+ goto err_reg;
+ }
+ bq->gpio_2407x_en2 = pdata->gpio_2407x_en2;
+ }
ret = gpio_direction_output(pdata->gpio_iset2, 0);
if (ret) {
dev_err(&pdev->dev, "couldn't set ISET2 GPIO: %d\n",
@@ -140,6 +183,13 @@ static int __init bq24022_probe(struct platform_device *pdev)
bq->gpio_nce = pdata->gpio_nce;
bq->state_nce = 1;
+ /* get maximum current from regulator_init_data */
+ if (pdata->init_data) {
+ bq->max_uA = pdata->init_data->constraints.max_uA;
+ dev_dbg(&pdev->dev, "maximum current is %d mA\n",
+ bq->max_uA / 1000);
+ }
+
bq->rdev = regulator_register(&bq24022_desc, &pdev->dev,
pdata->init_data, bq);
if (IS_ERR(bq->rdev)) {
@@ -152,6 +202,9 @@ static int __init bq24022_probe(struct platform_device *pdev)
return 0;
err_reg:
+ if (pdata->gpio_2407x_en2)
+ gpio_free(pdata->gpio_2407x_en2);
+err_en2:
gpio_free(pdata->gpio_iset2);
err_iset2:
gpio_free(pdata->gpio_nce);
@@ -164,6 +217,8 @@ static int __devexit bq24022_remove(struct platform_device *pdev)
struct bq24022 *bq = platform_get_drvdata(pdev);
regulator_unregister(bq->rdev);
+ if (bq->gpio_2407x_en2)
+ gpio_free(bq->gpio_2407x_en2);
gpio_free(bq->gpio_iset2);
gpio_free(bq->gpio_nce);
---------------------- include/linux/regulator/bq24022.h -----------------------
index a6d0140..39a48e1 100644
@@ -16,9 +16,16 @@ struct regulator_init_data;
* bq24022_mach_info - platform data for bq24022
* @gpio_nce: GPIO line connected to the nCE pin, used to enable / disable charging
* @gpio_iset2: GPIO line connected to the ISET2 pin, used to limit charging current to 100 mA / 500 mA
+ * @gpio_2407x_en2: GPIO line connected to the en2 pin of the bq2407x family
+ * Modes of operation for bq2407x:
+ * EN2 = 0, ISET2 = 0: 100mA
+ * EN2 = 0, ISET2 = 1: 500mA
+ * EN2 = 1, ISET2 = 0: max_current
+ * EN2 = 1, ISET2 = 1: Standby (usb suspend)
*/
struct bq24022_mach_info {
int gpio_nce;
int gpio_iset2;
+ int gpio_2407x_en2;
struct regulator_init_data *init_data;
};