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![Arvind Yadav](/assets/img/avatar_default.png)
The platform_get_irq_byname() function returns negative if an error occurs.
zero or positive number on success. platform_get_irq_byname() error
checking for zero is not correct.
Fixes: 6d6ce40f63
("phy: cpcap-usb: Add CPCAP PMIC USB support")
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
676 lines
15 KiB
C
676 lines
15 KiB
C
/*
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* Motorola CPCAP PMIC USB PHY driver
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* Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
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*
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* Some parts based on earlier Motorola Linux kernel tree code in
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* board-mapphone-usb.c and cpcap-usb-det.c:
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* Copyright (C) 2007 - 2011 Motorola, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/atomic.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/iio/consumer.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mfd/motorola-cpcap.h>
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#include <linux/phy/omap_usb.h>
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#include <linux/phy/phy.h>
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#include <linux/regulator/consumer.h>
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#include <linux/usb/musb.h>
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/* CPCAP_REG_USBC1 register bits */
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#define CPCAP_BIT_IDPULSE BIT(15)
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#define CPCAP_BIT_ID100KPU BIT(14)
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#define CPCAP_BIT_IDPUCNTRL BIT(13)
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#define CPCAP_BIT_IDPU BIT(12)
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#define CPCAP_BIT_IDPD BIT(11)
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#define CPCAP_BIT_VBUSCHRGTMR3 BIT(10)
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#define CPCAP_BIT_VBUSCHRGTMR2 BIT(9)
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#define CPCAP_BIT_VBUSCHRGTMR1 BIT(8)
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#define CPCAP_BIT_VBUSCHRGTMR0 BIT(7)
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#define CPCAP_BIT_VBUSPU BIT(6)
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#define CPCAP_BIT_VBUSPD BIT(5)
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#define CPCAP_BIT_DMPD BIT(4)
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#define CPCAP_BIT_DPPD BIT(3)
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#define CPCAP_BIT_DM1K5PU BIT(2)
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#define CPCAP_BIT_DP1K5PU BIT(1)
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#define CPCAP_BIT_DP150KPU BIT(0)
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/* CPCAP_REG_USBC2 register bits */
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#define CPCAP_BIT_ZHSDRV1 BIT(15)
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#define CPCAP_BIT_ZHSDRV0 BIT(14)
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#define CPCAP_BIT_DPLLCLKREQ BIT(13)
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#define CPCAP_BIT_SE0CONN BIT(12)
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#define CPCAP_BIT_UARTTXTRI BIT(11)
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#define CPCAP_BIT_UARTSWAP BIT(10)
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#define CPCAP_BIT_UARTMUX1 BIT(9)
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#define CPCAP_BIT_UARTMUX0 BIT(8)
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#define CPCAP_BIT_ULPISTPLOW BIT(7)
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#define CPCAP_BIT_TXENPOL BIT(6)
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#define CPCAP_BIT_USBXCVREN BIT(5)
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#define CPCAP_BIT_USBCNTRL BIT(4)
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#define CPCAP_BIT_USBSUSPEND BIT(3)
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#define CPCAP_BIT_EMUMODE2 BIT(2)
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#define CPCAP_BIT_EMUMODE1 BIT(1)
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#define CPCAP_BIT_EMUMODE0 BIT(0)
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/* CPCAP_REG_USBC3 register bits */
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#define CPCAP_BIT_SPARE_898_15 BIT(15)
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#define CPCAP_BIT_IHSTX03 BIT(14)
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#define CPCAP_BIT_IHSTX02 BIT(13)
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#define CPCAP_BIT_IHSTX01 BIT(12)
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#define CPCAP_BIT_IHSTX0 BIT(11)
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#define CPCAP_BIT_IDPU_SPI BIT(10)
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#define CPCAP_BIT_UNUSED_898_9 BIT(9)
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#define CPCAP_BIT_VBUSSTBY_EN BIT(8)
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#define CPCAP_BIT_VBUSEN_SPI BIT(7)
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#define CPCAP_BIT_VBUSPU_SPI BIT(6)
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#define CPCAP_BIT_VBUSPD_SPI BIT(5)
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#define CPCAP_BIT_DMPD_SPI BIT(4)
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#define CPCAP_BIT_DPPD_SPI BIT(3)
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#define CPCAP_BIT_SUSPEND_SPI BIT(2)
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#define CPCAP_BIT_PU_SPI BIT(1)
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#define CPCAP_BIT_ULPI_SPI_SEL BIT(0)
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struct cpcap_usb_ints_state {
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bool id_ground;
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bool id_float;
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bool chrg_det;
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bool rvrs_chrg;
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bool vbusov;
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bool chrg_se1b;
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bool se0conn;
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bool rvrs_mode;
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bool chrgcurr1;
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bool vbusvld;
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bool sessvld;
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bool sessend;
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bool se1;
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bool battdetb;
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bool dm;
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bool dp;
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};
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enum cpcap_gpio_mode {
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CPCAP_DM_DP,
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CPCAP_MDM_RX_TX,
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CPCAP_UNKNOWN,
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CPCAP_OTG_DM_DP,
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};
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struct cpcap_phy_ddata {
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struct regmap *reg;
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struct device *dev;
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struct clk *refclk;
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struct usb_phy phy;
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struct delayed_work detect_work;
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struct pinctrl *pins;
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struct pinctrl_state *pins_ulpi;
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struct pinctrl_state *pins_utmi;
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struct pinctrl_state *pins_uart;
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struct gpio_desc *gpio[2];
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struct iio_channel *vbus;
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struct iio_channel *id;
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struct regulator *vusb;
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atomic_t active;
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};
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static bool cpcap_usb_vbus_valid(struct cpcap_phy_ddata *ddata)
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{
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int error, value = 0;
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error = iio_read_channel_processed(ddata->vbus, &value);
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if (error >= 0)
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return value > 3900 ? true : false;
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dev_err(ddata->dev, "error reading VBUS: %i\n", error);
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return false;
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}
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static int cpcap_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
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{
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otg->host = host;
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if (!host)
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otg->state = OTG_STATE_UNDEFINED;
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return 0;
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}
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static int cpcap_usb_phy_set_peripheral(struct usb_otg *otg,
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struct usb_gadget *gadget)
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{
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otg->gadget = gadget;
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if (!gadget)
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otg->state = OTG_STATE_UNDEFINED;
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return 0;
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}
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static const struct phy_ops ops = {
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.owner = THIS_MODULE,
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};
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static int cpcap_phy_get_ints_state(struct cpcap_phy_ddata *ddata,
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struct cpcap_usb_ints_state *s)
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{
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int val, error;
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error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
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if (error)
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return error;
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s->id_ground = val & BIT(15);
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s->id_float = val & BIT(14);
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s->vbusov = val & BIT(11);
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error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
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if (error)
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return error;
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s->vbusvld = val & BIT(3);
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s->sessvld = val & BIT(2);
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s->sessend = val & BIT(1);
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s->se1 = val & BIT(0);
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error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
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if (error)
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return error;
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s->dm = val & BIT(1);
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s->dp = val & BIT(0);
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return 0;
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}
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static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata);
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static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata);
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static void cpcap_usb_detect(struct work_struct *work)
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{
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struct cpcap_phy_ddata *ddata;
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struct cpcap_usb_ints_state s;
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bool vbus = false;
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int error;
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ddata = container_of(work, struct cpcap_phy_ddata, detect_work.work);
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error = cpcap_phy_get_ints_state(ddata, &s);
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if (error)
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return;
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if (s.id_ground) {
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dev_dbg(ddata->dev, "id ground, USB host mode\n");
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error = cpcap_usb_set_usb_mode(ddata);
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if (error)
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goto out_err;
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error = musb_mailbox(MUSB_ID_GROUND);
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if (error)
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goto out_err;
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
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CPCAP_BIT_VBUSSTBY_EN,
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CPCAP_BIT_VBUSSTBY_EN);
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if (error)
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goto out_err;
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return;
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}
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
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CPCAP_BIT_VBUSSTBY_EN, 0);
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if (error)
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goto out_err;
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vbus = cpcap_usb_vbus_valid(ddata);
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if (vbus) {
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/* Are we connected to a docking station with vbus? */
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if (s.id_ground) {
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dev_dbg(ddata->dev, "connected to a dock\n");
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/* No VBUS needed with docks */
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error = cpcap_usb_set_usb_mode(ddata);
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if (error)
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goto out_err;
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error = musb_mailbox(MUSB_ID_GROUND);
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if (error)
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goto out_err;
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return;
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}
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/* Otherwise assume we're connected to a USB host */
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dev_dbg(ddata->dev, "connected to USB host\n");
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error = cpcap_usb_set_usb_mode(ddata);
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if (error)
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goto out_err;
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error = musb_mailbox(MUSB_VBUS_VALID);
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if (error)
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goto out_err;
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return;
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}
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/* Default to debug UART mode */
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error = cpcap_usb_set_uart_mode(ddata);
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if (error)
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goto out_err;
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error = musb_mailbox(MUSB_VBUS_OFF);
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if (error)
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goto out_err;
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dev_dbg(ddata->dev, "set UART mode\n");
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return;
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out_err:
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dev_err(ddata->dev, "error setting cable state: %i\n", error);
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}
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static irqreturn_t cpcap_phy_irq_thread(int irq, void *data)
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{
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struct cpcap_phy_ddata *ddata = data;
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if (!atomic_read(&ddata->active))
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return IRQ_NONE;
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schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
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return IRQ_HANDLED;
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}
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static int cpcap_usb_init_irq(struct platform_device *pdev,
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struct cpcap_phy_ddata *ddata,
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const char *name)
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{
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int irq, error;
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irq = platform_get_irq_byname(pdev, name);
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if (irq < 0)
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return -ENODEV;
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error = devm_request_threaded_irq(ddata->dev, irq, NULL,
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cpcap_phy_irq_thread,
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IRQF_SHARED,
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name, ddata);
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if (error) {
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dev_err(ddata->dev, "could not get irq %s: %i\n",
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name, error);
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return error;
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}
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return 0;
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}
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static const char * const cpcap_phy_irqs[] = {
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/* REG_INT_0 */
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"id_ground", "id_float",
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/* REG_INT1 */
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"se0conn", "vbusvld", "sessvld", "sessend", "se1",
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/* REG_INT_3 */
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"dm", "dp",
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};
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static int cpcap_usb_init_interrupts(struct platform_device *pdev,
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struct cpcap_phy_ddata *ddata)
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{
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int i, error;
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for (i = 0; i < ARRAY_SIZE(cpcap_phy_irqs); i++) {
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error = cpcap_usb_init_irq(pdev, ddata, cpcap_phy_irqs[i]);
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if (error)
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return error;
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}
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return 0;
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}
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/*
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* Optional pins and modes. At least Motorola mapphone devices
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* are using two GPIOs and dynamic pinctrl to multiplex PHY pins
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* to UART, ULPI or UTMI mode.
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*/
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static int cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata *ddata,
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enum cpcap_gpio_mode mode)
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{
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if (!ddata->gpio[0] || !ddata->gpio[1])
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return 0;
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gpiod_set_value(ddata->gpio[0], mode & 1);
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gpiod_set_value(ddata->gpio[1], mode >> 1);
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return 0;
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}
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static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata)
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{
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int error;
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error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP);
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if (error)
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goto out_err;
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if (ddata->pins_uart) {
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error = pinctrl_select_state(ddata->pins, ddata->pins_uart);
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if (error)
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goto out_err;
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}
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
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CPCAP_BIT_VBUSPD,
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CPCAP_BIT_VBUSPD);
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if (error)
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goto out_err;
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
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0xffff, CPCAP_BIT_UARTMUX0 |
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CPCAP_BIT_EMUMODE0);
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if (error)
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goto out_err;
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, 0x7fff,
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CPCAP_BIT_IDPU_SPI);
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if (error)
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goto out_err;
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return 0;
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out_err:
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dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
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return error;
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}
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static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata)
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{
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int error;
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error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP);
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if (error)
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return error;
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if (ddata->pins_utmi) {
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error = pinctrl_select_state(ddata->pins, ddata->pins_utmi);
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if (error) {
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dev_err(ddata->dev, "could not set usb mode: %i\n",
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error);
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return error;
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}
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}
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
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CPCAP_BIT_VBUSPD, 0);
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if (error)
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goto out_err;
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
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CPCAP_BIT_USBXCVREN,
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CPCAP_BIT_USBXCVREN);
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if (error)
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goto out_err;
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
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CPCAP_BIT_PU_SPI |
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CPCAP_BIT_DMPD_SPI |
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CPCAP_BIT_DPPD_SPI |
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CPCAP_BIT_SUSPEND_SPI |
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CPCAP_BIT_ULPI_SPI_SEL, 0);
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if (error)
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goto out_err;
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error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
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CPCAP_BIT_USBXCVREN,
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CPCAP_BIT_USBXCVREN);
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if (error)
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goto out_err;
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return 0;
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out_err:
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dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
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return error;
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}
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static int cpcap_usb_init_optional_pins(struct cpcap_phy_ddata *ddata)
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{
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ddata->pins = devm_pinctrl_get(ddata->dev);
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if (IS_ERR(ddata->pins)) {
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dev_info(ddata->dev, "default pins not configured: %ld\n",
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PTR_ERR(ddata->pins));
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ddata->pins = NULL;
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return 0;
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}
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ddata->pins_ulpi = pinctrl_lookup_state(ddata->pins, "ulpi");
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if (IS_ERR(ddata->pins_ulpi)) {
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dev_info(ddata->dev, "ulpi pins not configured\n");
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ddata->pins_ulpi = NULL;
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}
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ddata->pins_utmi = pinctrl_lookup_state(ddata->pins, "utmi");
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if (IS_ERR(ddata->pins_utmi)) {
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dev_info(ddata->dev, "utmi pins not configured\n");
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ddata->pins_utmi = NULL;
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}
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ddata->pins_uart = pinctrl_lookup_state(ddata->pins, "uart");
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if (IS_ERR(ddata->pins_uart)) {
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dev_info(ddata->dev, "uart pins not configured\n");
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ddata->pins_uart = NULL;
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}
|
|
|
|
if (ddata->pins_uart)
|
|
return pinctrl_select_state(ddata->pins, ddata->pins_uart);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata *ddata)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
|
|
i, GPIOD_OUT_HIGH);
|
|
if (IS_ERR(ddata->gpio[i])) {
|
|
dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
|
|
i, PTR_ERR(ddata->gpio[i]));
|
|
ddata->gpio[i] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int cpcap_usb_init_iio(struct cpcap_phy_ddata *ddata)
|
|
{
|
|
enum iio_chan_type type;
|
|
int error;
|
|
|
|
ddata->vbus = devm_iio_channel_get(ddata->dev, "vbus");
|
|
if (IS_ERR(ddata->vbus)) {
|
|
error = PTR_ERR(ddata->vbus);
|
|
goto out_err;
|
|
}
|
|
|
|
if (!ddata->vbus->indio_dev) {
|
|
error = -ENXIO;
|
|
goto out_err;
|
|
}
|
|
|
|
error = iio_get_channel_type(ddata->vbus, &type);
|
|
if (error < 0)
|
|
goto out_err;
|
|
|
|
if (type != IIO_VOLTAGE) {
|
|
error = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
|
|
error);
|
|
|
|
return error;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id cpcap_usb_phy_id_table[] = {
|
|
{
|
|
.compatible = "motorola,cpcap-usb-phy",
|
|
},
|
|
{
|
|
.compatible = "motorola,mapphone-cpcap-usb-phy",
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, cpcap_usb_phy_id_table);
|
|
#endif
|
|
|
|
static int cpcap_usb_phy_probe(struct platform_device *pdev)
|
|
{
|
|
struct cpcap_phy_ddata *ddata;
|
|
struct phy *generic_phy;
|
|
struct phy_provider *phy_provider;
|
|
struct usb_otg *otg;
|
|
const struct of_device_id *of_id;
|
|
int error;
|
|
|
|
of_id = of_match_device(of_match_ptr(cpcap_usb_phy_id_table),
|
|
&pdev->dev);
|
|
if (!of_id)
|
|
return -EINVAL;
|
|
|
|
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
|
|
if (!ddata)
|
|
return -ENOMEM;
|
|
|
|
ddata->reg = dev_get_regmap(pdev->dev.parent, NULL);
|
|
if (!ddata->reg)
|
|
return -ENODEV;
|
|
|
|
otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
|
|
if (!otg)
|
|
return -ENOMEM;
|
|
|
|
ddata->dev = &pdev->dev;
|
|
ddata->phy.dev = ddata->dev;
|
|
ddata->phy.label = "cpcap_usb_phy";
|
|
ddata->phy.otg = otg;
|
|
ddata->phy.type = USB_PHY_TYPE_USB2;
|
|
otg->set_host = cpcap_usb_phy_set_host;
|
|
otg->set_peripheral = cpcap_usb_phy_set_peripheral;
|
|
otg->usb_phy = &ddata->phy;
|
|
INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
|
|
platform_set_drvdata(pdev, ddata);
|
|
|
|
ddata->vusb = devm_regulator_get(&pdev->dev, "vusb");
|
|
if (IS_ERR(ddata->vusb))
|
|
return PTR_ERR(ddata->vusb);
|
|
|
|
error = regulator_enable(ddata->vusb);
|
|
if (error)
|
|
return error;
|
|
|
|
generic_phy = devm_phy_create(ddata->dev, NULL, &ops);
|
|
if (IS_ERR(generic_phy)) {
|
|
error = PTR_ERR(generic_phy);
|
|
return PTR_ERR(generic_phy);
|
|
}
|
|
|
|
phy_set_drvdata(generic_phy, ddata);
|
|
|
|
phy_provider = devm_of_phy_provider_register(ddata->dev,
|
|
of_phy_simple_xlate);
|
|
if (IS_ERR(phy_provider))
|
|
return PTR_ERR(phy_provider);
|
|
|
|
error = cpcap_usb_init_optional_pins(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
cpcap_usb_init_optional_gpios(ddata);
|
|
|
|
error = cpcap_usb_init_iio(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = cpcap_usb_init_interrupts(pdev, ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
usb_add_phy_dev(&ddata->phy);
|
|
atomic_set(&ddata->active, 1);
|
|
schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpcap_usb_phy_remove(struct platform_device *pdev)
|
|
{
|
|
struct cpcap_phy_ddata *ddata = platform_get_drvdata(pdev);
|
|
int error;
|
|
|
|
atomic_set(&ddata->active, 0);
|
|
error = cpcap_usb_set_uart_mode(ddata);
|
|
if (error)
|
|
dev_err(ddata->dev, "could not set UART mode\n");
|
|
|
|
error = musb_mailbox(MUSB_VBUS_OFF);
|
|
if (error)
|
|
dev_err(ddata->dev, "could not set mailbox\n");
|
|
|
|
usb_remove_phy(&ddata->phy);
|
|
cancel_delayed_work_sync(&ddata->detect_work);
|
|
clk_unprepare(ddata->refclk);
|
|
regulator_disable(ddata->vusb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver cpcap_usb_phy_driver = {
|
|
.probe = cpcap_usb_phy_probe,
|
|
.remove = cpcap_usb_phy_remove,
|
|
.driver = {
|
|
.name = "cpcap-usb-phy",
|
|
.of_match_table = of_match_ptr(cpcap_usb_phy_id_table),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(cpcap_usb_phy_driver);
|
|
|
|
MODULE_ALIAS("platform:cpcap_usb");
|
|
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
|
|
MODULE_DESCRIPTION("CPCAP usb phy driver");
|
|
MODULE_LICENSE("GPL v2");
|