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Date: Thu, 30 Apr 2015 15:53:46 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
Cc: linux-kernel@...r.kernel.org, Chanwoo Choi <cwchoi00@...il.com>,
Lee Jones <lee.jones@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v8] extcon-axp288: Add axp288 extcon driver support
Hi Ram,
I added some comment.
If you fix minor issue according to comment, I'll apply it.
On 04/30/2015 10:43 AM, Ramakrishna Pallala wrote:
> This patch adds the extcon support for AXP288 PMIC which
> has the BC1.2 charger detection capability. Additionally
> it also adds the USB mux switching support b/w SOC and PMIC
> based on GPIO control.
>
> Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
> ---
> drivers/extcon/Kconfig | 7 +
> drivers/extcon/Makefile | 1 +
> drivers/extcon/extcon-axp288.c | 386 ++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/axp20x.h | 5 +
> 4 files changed, 399 insertions(+)
> create mode 100644 drivers/extcon/extcon-axp288.c
[snip]
> +static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
> +{
> + static bool notify_otg, notify_charger;
> + static char *cable;
> + int ret, stat, cfg, pwr_stat;
> + u8 chrg_type;
> + bool vbus_attach = false;
> +
> + ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
> + if (ret < 0) {
> + dev_err(info->dev, "failed to read vbus status\n");
> + return ret;
> + }
> +
> + vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT);
> + if (!vbus_attach)
> + goto notify_otg;
> +
> + /* Check charger detection completion status */
> + ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
> + if (ret < 0)
> + goto dev_det_ret;
> + if (cfg & BC_GLOBAL_DET_STAT) {
> + dev_dbg(info->dev, "can't complete the charger detection\n");
> + goto dev_det_ret;
> + }
> +
> + ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
> + if (ret < 0)
> + goto dev_det_ret;
> + dev_dbg(info->dev, "status:%x, config:%x\n", stat, cfg);
As I said on previous reply, it is not necessary about just register value
without appropriate log message.
> +
> + chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
> +
> + switch (chrg_type) {
> + case DET_STAT_SDP:
> + dev_dbg(info->dev, "sdp cable is connecetd\n");
> + notify_otg = true;
> + notify_charger = true;
> + cable = AXP288_EXTCON_SLOW_CHARGER;
> + break;
> + case DET_STAT_CDP:
> + dev_dbg(info->dev, "cdp cable is connecetd\n");
> + notify_otg = true;
> + notify_charger = true;
> + cable = AXP288_EXTCON_DOWNSTREAM_CHARGER;
> + break;
> + case DET_STAT_DCP:
> + dev_dbg(info->dev, "dcp cable is connecetd\n");
> + notify_charger = true;
> + cable = AXP288_EXTCON_FAST_CHARGER;
> + break;
> + default:
> + dev_warn(info->dev,
> + "disconnect or unknown or ID event\n");
> + }
> +
> +notify_otg:
> + if (notify_otg) {
> + /*
> + * If VBUS is absent Connect D+/D- lines to PMIC for BC
> + * detection. Else connect them to SOC for USB communication.
> + */
> + if (info->pdata->gpio_mux_cntl)
> + gpiod_set_value(info->pdata->gpio_mux_cntl,
> + vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
> + : EXTCON_GPIO_MUX_SEL_PMIC);
> +
> + atomic_notifier_call_chain(&info->otg->notifier,
> + vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE, NULL);
> + }
> +
> + if (notify_charger)
> + extcon_set_cable_state(info->edev, cable, vbus_attach);
> +
> + /* Clear the flags on disconnect event */
> + if (!vbus_attach)
> + notify_otg = notify_charger = false;
> +
> + return 0;
> +
> +dev_det_ret:
> + if (ret < 0)
> + dev_err(info->dev, "BC Mod detection error\n");
"BC Mod detection error\n" -> "failed to detect BC Mod\n"
> +
> + return ret;
> +}
> +
> +static irqreturn_t axp288_extcon_isr(int irq, void *data)
> +{
> + struct axp288_extcon_info *info = data;
> + int ret;
> +
> + ret = axp288_handle_chrg_det_event(info);
> + if (ret < 0)
> + dev_err(info->dev, "error in PWRSRC INT handling\n");
As I saied on previous reply, you better to modify log message as following:
"failed to handle the interrupt\n"
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
> +{
> + /* Unmask VBUS interrupt */
> + regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
> + PWRSRC_IRQ_CFG_MASK);
> + regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
> + BC_GLOBAL_RUN, 0);
> + /* Unmask the BC1.2 complete interrupts */
> + regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
> + /* Enable the charger detection logic */
> + regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
> + BC_GLOBAL_RUN, BC_GLOBAL_RUN);
> +}
> +
> +static int axp288_extcon_probe(struct platform_device *pdev)
> +{
[snip]
> +
> + /* Register extcon device */
> + ret = devm_extcon_dev_register(&pdev->dev, info->edev);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to register extcon device\n");
> + return ret;
> + }
> +
> + /* Get otg transceiver phy */
> + info->otg = usb_get_phy(USB_PHY_TYPE_USB2);
> + if (IS_ERR(info->otg)) {
> + dev_warn(&pdev->dev, "failed to get otg transceiver\n");
dev_warn -> dev_err
> + return PTR_ERR(info->otg);
> + }
> +
> + /* Set up gpio control for USB Mux */
> + if (info->pdata->gpio_mux_cntl) {
> + gpio = desc_to_gpio(info->pdata->gpio_mux_cntl);
> + ret = gpio_request(gpio, "USB_MUX");
> + if (ret < 0) {
> + dev_err(&pdev->dev,
> + "failed to request the gpio=%d\n", gpio);
> + goto gpio_req_failed;
> + }
> + gpiod_direction_output(info->pdata->gpio_mux_cntl,
> + EXTCON_GPIO_MUX_SEL_PMIC);
> + }
> +
> + for (i = 0; i < EXTCON_IRQ_END; i++) {
> + pirq = platform_get_irq(pdev, i);
> + info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
> + if (info->irq[i] < 0) {
> + dev_warn(&pdev->dev,
> + "failed to get virtual interrupt=%d\n", pirq);
> + ret = info->irq[i];
dev_warn -> dev_err
[snip]
Thanks,
Chanwoo Choi
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