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Subject[PATCH v3] drivers: power: twl4030_charger: fix link problems when building as module
Date
If either twl4030_charger or twl4030_madc is configured as MODULE,
we get build (link) errors.

To solve, the direct call of twl4030_get_madc_conversion() is replaced
by a call to iio_read_channel_processed().

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Marek Belisko <marek@goldelico.com>
---
changes from v2: make iio propries optional to keep functionality for old DT also
changes from V1: added missing iio_channel_release + document and add new DT bindings
drivers/power/twl4030_charger.c | 45 ++++++++++++++++++++++++++++-------------
1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index f4f2c1f..82e2a05 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -22,7 +22,7 @@
#include <linux/power_supply.h>
#include <linux/notifier.h>
#include <linux/usb/otg.h>
-#include <linux/i2c/twl4030-madc.h>
+#include <linux/iio/consumer.h>

#define TWL4030_BCIMDEN 0x00
#define TWL4030_BCIMDKEY 0x01
@@ -91,21 +91,23 @@
#define TWL4030_MSTATEC_COMPLETE1 0x0b
#define TWL4030_MSTATEC_COMPLETE4 0x0e

-#if IS_ENABLED(CONFIG_TWL4030_MADC)
/*
* If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
* then AC is available.
*/
-static inline int ac_available(void)
+static inline int ac_available(struct iio_channel *channel_vac)
{
- return twl4030_get_madc_conversion(11) > 4500;
-}
-#else
-static inline int ac_available(void)
-{
- return 0;
+ int val, err;
+
+ if (!channel_vac)
+ return 0;
+
+ err = iio_read_channel_processed(channel_vac, &val);
+ if (err < 0)
+ return 0;
+ return val > 4500;
}
-#endif
+
static bool allow_usb;
module_param(allow_usb, bool, 0644);
MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
@@ -128,6 +130,7 @@ struct twl4030_bci {
*/
unsigned int ichg_eoc, ichg_lo, ichg_hi;
unsigned int usb_cur, ac_cur;
+ struct iio_channel *channel_vac;
bool ac_is_active;
int usb_mode, ac_mode; /* charging mode requested */
#define CHARGE_OFF 0
@@ -278,7 +281,7 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
* If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
* and AC is enabled, set current for 'ac'
*/
- if (ac_available()) {
+ if (ac_available(bci->channel_vac)) {
cur = bci->ac_cur;
bci->ac_is_active = true;
} else {
@@ -1048,6 +1051,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
return ret;
}

+ bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
+ if (IS_ERR(bci->channel_vac)) {
+ bci->channel_vac = NULL;
+ dev_warn(&pdev->dev, "could not request vac iio channel");
+ }
+
INIT_WORK(&bci->work, twl4030_bci_usb_work);
INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);

@@ -1061,8 +1070,10 @@ static int twl4030_bci_probe(struct platform_device *pdev)
bci->transceiver = devm_usb_get_phy_by_node(
bci->dev, phynode, &bci->usb_nb);
if (IS_ERR(bci->transceiver) &&
- PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
- return -EPROBE_DEFER;
+ PTR_ERR(bci->transceiver) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto fail;
+ }
}
}

@@ -1073,7 +1084,7 @@ static int twl4030_bci_probe(struct platform_device *pdev)
TWL4030_INTERRUPTS_BCIIMR1A);
if (ret < 0) {
dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
- return ret;
+ goto fail;
}

reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
@@ -1106,6 +1117,10 @@ static int twl4030_bci_probe(struct platform_device *pdev)
twl4030_charger_enable_backup(0, 0);

return 0;
+fail:
+ iio_channel_release(bci->channel_vac);
+
+ return ret;
}

static int __exit twl4030_bci_remove(struct platform_device *pdev)
@@ -1116,6 +1131,8 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
twl4030_charger_enable_usb(bci, false);
twl4030_charger_enable_backup(0, 0);

+ iio_channel_release(bci->channel_vac);
+
device_remove_file(&bci->usb->dev, &dev_attr_max_current);
device_remove_file(&bci->usb->dev, &dev_attr_mode);
device_remove_file(&bci->ac->dev, &dev_attr_max_current);
--
1.9.1


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