Re: [PATCH] mfd: ab8500: add devicetree support for fuelgauge

From: Francesco Lavra
Date: Sat Oct 20 2012 - 11:50:38 EST

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Hi Rajanikanth,

On 10/16/2012 05:36 AM, Rajanikanth H.V wrote:
> From: "Rajanikanth H.V" <rajanikanth.hv@xxxxxxxxxxxxxx>
>
> - This patch adds device tree support for fuelgauge driver
> - optimize bm devices platform_data usage and of_probe(...)
> Note: of_probe() routine for battery managed devices is made
> common across all bm drivers.
> - test status:
> - interrupt numbers assigned differs between legacy and FDT mode.
>
> Legacy platform_data Mode:
> root@ME:/ cat /proc/interrupts
> CPU0 CPU1
> 483: 0 0 ab8500 ab8500-ponkey-dbf
> 484: 0 0 ab8500 ab8500-ponkey-dbr
> 485: 0 0 ab8500 BATT_OVV
> 494: 0 1 ab8500
> 495: 0 0 ab8500 ab8500-rtc
> 501: 0 13 ab8500 NCONV_ACCU
> 503: 7 22 ab8500 CCEOC
> 504: 0 1 ab8500 CC_INT_CALIB
> 505: 0 0 ab8500 LOW_BAT_F
> 516: 0 34 ab8500 ab8500-gpadc
> 556: 0 0 ab8500 usb-link-status
>
> FDT Mode:
> root@ME:/ cat /proc/interrupts
> CPU0 CPU1
> 6: 0 0 ab8500 ab8500-ponkey-dbf
> 7: 0 0 ab8500 ab8500-ponkey-dbr
> 8: 0 0 ab8500 BATT_OVV
> 162: 0 7 ab8500 ab8500-gpadc
> 163: 0 1 ab8500
> 164: 0 0 ab8500 ab8500-rtc
> 484: 0 0 ab8500 usb-link-status
> 499: 0 4 ab8500 NCONV_ACCU
> 500: 0 0 ab8500 LOW_BAT_F
> 502: 0 1 ab8500 CC_INT_CALIB
> 503: 0 6 ab8500 CCEOC
>
> Signed-off-by: Rajanikanth H.V <rajanikanth.hv@xxxxxxxxxxxxxx>
[...]
> +int __devinit
> +bmdevs_of_probe(struct device *dev,
> + struct device_node *np,
> + struct abx500_bm_data **battery)
> +{
> + struct abx500_battery_type *btype;
> + struct device_node *np_bat_supply;
> + struct abx500_bm_data *bat;
> + int i, thermistor;
> + char *bat_tech = "UNKNOWN";

This initialization is useless.

> +
> + *battery = devm_kzalloc(dev, sizeof(*bat), GFP_KERNEL);
> + if (!*battery) {
> + dev_err(dev, "%s no mem for plat_data\n", __func__);
> + return -ENOMEM;
> + }
> + *battery = &ab8500_bm_data;

Looks like dynamic allocation here is not what you need, since you are
overwriting the pointer to the allocated data.

> +
> + /* get phandle to 'battery-info' node */
> + np_bat_supply = of_parse_phandle(np, "battery", 0);
> + if (!np_bat_supply) {
> + dev_err(dev, "missing property battery\n");
> + return -EINVAL;
> + }
> + if (of_property_read_bool(np_bat_supply,
> + "thermistor-on-batctrl"))
> + thermistor = NTC_INTERNAL;
> + else
> + thermistor = NTC_EXTERNAL;
> +
> + bat = *battery;
> + if (thermistor == NTC_EXTERNAL) {
> + bat->n_btypes = 4;
> + bat->bat_type = bat_type_ext_thermistor;
> + bat->adc_therm = ABx500_ADC_THERM_BATTEMP;
> + }
> + bat_tech = (char *)of_get_property(
> + np_bat_supply, "stericsson,battery-type", NULL);

No need to cast a void * to a char *.

> + if (!bat_tech) {
> + dev_warn(dev, "missing property battery-name/type\n");
> + strncpy(bat_tech, "UNKNOWN", 7);

You are writing at a NULL pointer here...

> + }
> + of_node_put(np_bat_supply);

You can't call of_node_put here, because you are going to use bat_tech
later on. You have to call it at the end of this function, after you are
done with bat_tech.

> +
> + if (strncmp(bat_tech, "LION", 4) == 0) {
> + bat->no_maintenance = true;
> + bat->chg_unknown_bat = true;
> + bat->bat_type[BATTERY_UNKNOWN].charge_full_design = 2600;
> + bat->bat_type[BATTERY_UNKNOWN].termination_vol = 4150;
> + bat->bat_type[BATTERY_UNKNOWN].recharge_vol = 4130;
> + bat->bat_type[BATTERY_UNKNOWN].normal_cur_lvl = 520;
> + bat->bat_type[BATTERY_UNKNOWN].normal_vol_lvl = 4200;
> + }
> + /* select the battery resolution table */
> + for (i = 0; i < bat->n_btypes; ++i) {
> + btype = (bat->bat_type + i);
> + if (thermistor == NTC_EXTERNAL) {
> + btype->batres_tbl =
> + temp_to_batres_tbl_ext_thermistor;
> + } else if (strncmp(bat_tech, "LION", 4) == 0) {
> + btype->batres_tbl =
> + temp_to_batres_tbl_9100;
> + } else {
> + btype->batres_tbl =
> + temp_to_batres_tbl_thermistor;
> + }
> + }
> + return 0;
> +}
[...]
> diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
> index bf02225..ff64dd4 100644
> --- a/drivers/power/ab8500_fg.c
> +++ b/drivers/power/ab8500_fg.c
> @@ -22,15 +22,16 @@
> #include <linux/platform_device.h>
> #include <linux/power_supply.h>
> #include <linux/kobject.h>
> -#include <linux/mfd/abx500/ab8500.h>
> -#include <linux/mfd/abx500.h>
> #include <linux/slab.h>
> -#include <linux/mfd/abx500/ab8500-bm.h>
> #include <linux/delay.h>
> -#include <linux/mfd/abx500/ab8500-gpadc.h>
> -#include <linux/mfd/abx500.h>
> #include <linux/time.h>
> +#include <linux/of.h>
> #include <linux/completion.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/abx500.h>
> +#include <linux/mfd/abx500/ab8500.h>
> +#include <linux/mfd/abx500/ab8500-bm.h>
> +#include <linux/mfd/abx500/ab8500-gpadc.h>
>
> #define MILLI_TO_MICRO 1000
> #define FG_LSB_IN_MA 1627
> @@ -212,7 +213,6 @@ struct ab8500_fg {
> struct ab8500_fg_avg_cap avg_cap;
> struct ab8500 *parent;
> struct ab8500_gpadc *gpadc;
> - struct abx500_fg_platform_data *pdata;
> struct abx500_bm_data *bat;
> struct power_supply fg_psy;
> struct workqueue_struct *fg_wq;
> @@ -2416,6 +2416,8 @@ static int __devexit ab8500_fg_remove(struct platform_device *pdev)
> int ret = 0;
> struct ab8500_fg *di = platform_get_drvdata(pdev);
>
> + of_node_put(pdev->dev.of_node);

This is wrong, the probe function doesn't increment the refcount of this
node, so you don't have to decrement it here.

> +
> list_del(&di->node);
>
> /* Disable coulomb counter */
> @@ -2429,7 +2431,6 @@ static int __devexit ab8500_fg_remove(struct platform_device *pdev)
> flush_scheduled_work();
> power_supply_unregister(&di->fg_psy);
> platform_set_drvdata(pdev, NULL);
> - kfree(di);
> return ret;
> }
>
> @@ -2442,21 +2443,44 @@ static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
> {"CCEOC", ab8500_fg_cc_data_end_handler},
> };
>
> +char *supply_interface[] = {
> + "ab8500_chargalg",
> + "ab8500_usb",
> +};
> +
> static int __devinit ab8500_fg_probe(struct platform_device *pdev)
> {
> + struct device_node *np = pdev->dev.of_node;
> + struct ab8500_fg *di;
> int i, irq;
> int ret = 0;
> - struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data;
> - struct ab8500_fg *di;
>
> - if (!plat_data) {
> - dev_err(&pdev->dev, "No platform data\n");
> - return -EINVAL;
> + di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
> + if (!di) {
> + dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
> + if (np) {
> + ret = -ENOMEM;
> + goto release_node;

Here and below, release_node is wrong for the same reason as I wrote for
the remove function, you don't have to call of_node_put().

> + }
> + }
> + di->bat = (struct abx500_bm_data *)
> + pdev->mfd_cell->platform_data;

No need to cast a void *.

> + if (!di->bat) {
> + if (np) {
> + ret = bmdevs_of_probe(&pdev->dev, np, &di->bat);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "failed to get battery information\n");
> + goto release_node;
> + }
> + } else {
> + dev_err(&pdev->dev, "missing dt node for ab8500_fg\n");
> + ret = -EINVAL;
> + goto release_node;
> + }
> + } else {
> + dev_info(&pdev->dev, "falling back to legacy platform data\n");
> }
> -
> - di = kzalloc(sizeof(*di), GFP_KERNEL);
> - if (!di)
> - return -ENOMEM;
>
> mutex_init(&di->cc_lock);
>
> @@ -2465,29 +2489,13 @@ static int __devinit ab8500_fg_probe(struct platform_device *pdev)
> di->parent = dev_get_drvdata(pdev->dev.parent);
> di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
>
> - /* get fg specific platform data */
> - di->pdata = plat_data->fg;
> - if (!di->pdata) {
> - dev_err(di->dev, "no fg platform data supplied\n");
> - ret = -EINVAL;
> - goto free_device_info;
> - }
> -
> - /* get battery specific platform data */
> - di->bat = plat_data->battery;
> - if (!di->bat) {
> - dev_err(di->dev, "no battery platform data supplied\n");
> - ret = -EINVAL;
> - goto free_device_info;
> - }
> -
> di->fg_psy.name = "ab8500_fg";
> di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
> di->fg_psy.properties = ab8500_fg_props;
> di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
> di->fg_psy.get_property = ab8500_fg_get_property;
> - di->fg_psy.supplied_to = di->pdata->supplied_to;
> - di->fg_psy.num_supplicants = di->pdata->num_supplicants;
> + di->fg_psy.supplied_to = supply_interface;
> + di->fg_psy.num_supplicants = ARRAY_SIZE(supply_interface),
> di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
>
> di->bat_cap.max_mah_design = MILLI_TO_MICRO *
> @@ -2506,7 +2514,8 @@ static int __devinit ab8500_fg_probe(struct platform_device *pdev)
> di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
> if (di->fg_wq == NULL) {
> dev_err(di->dev, "failed to create work queue\n");
> - goto free_device_info;
> + ret = -ENOMEM;
> + goto release_node;
> }
>
> /* Init work for running the fg algorithm instantly */
> @@ -2605,12 +2614,17 @@ free_irq:
> }
> free_inst_curr_wq:
> destroy_workqueue(di->fg_wq);
> -free_device_info:
> - kfree(di);
>
> +release_node:
> + of_node_put(np);
> return ret;
> }

--
Francesco
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Next message: Rik van Riel: "Re: question on NUMA page migration"
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