2 * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
4 * Copyright (C) 2015 Intel Corporation
5 * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/module.h>
18 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/interrupt.h>
22 #include <linux/platform_device.h>
23 #include <linux/property.h>
24 #include <linux/usb/phy.h>
25 #include <linux/notifier.h>
26 #include <linux/extcon.h>
27 #include <linux/regmap.h>
28 #include <linux/gpio.h>
29 #include <linux/gpio/consumer.h>
30 #include <linux/mfd/axp20x.h>
32 /* Power source status register */
33 #define PS_STAT_VBUS_TRIGGER BIT(0)
34 #define PS_STAT_BAT_CHRG_DIR BIT(2)
35 #define PS_STAT_VBUS_ABOVE_VHOLD BIT(3)
36 #define PS_STAT_VBUS_VALID BIT(4)
37 #define PS_STAT_VBUS_PRESENT BIT(5)
39 /* BC module global register */
40 #define BC_GLOBAL_RUN BIT(0)
41 #define BC_GLOBAL_DET_STAT BIT(2)
42 #define BC_GLOBAL_DBP_TOUT BIT(3)
43 #define BC_GLOBAL_VLGC_COM_SEL BIT(4)
44 #define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)|BIT(5))
45 #define BC_GLOBAL_DCD_TOUT_300MS 0
46 #define BC_GLOBAL_DCD_TOUT_100MS 1
47 #define BC_GLOBAL_DCD_TOUT_500MS 2
48 #define BC_GLOBAL_DCD_TOUT_900MS 3
49 #define BC_GLOBAL_DCD_DET_SEL BIT(7)
51 /* BC module vbus control and status register */
52 #define VBUS_CNTL_DPDM_PD_EN BIT(4)
53 #define VBUS_CNTL_DPDM_FD_EN BIT(5)
54 #define VBUS_CNTL_FIRST_PO_STAT BIT(6)
56 /* BC USB status register */
57 #define USB_STAT_BUS_STAT_MASK (BIT(3)|BIT(2)|BIT(1)|BIT(0))
58 #define USB_STAT_BUS_STAT_SHIFT 0
59 #define USB_STAT_BUS_STAT_ATHD 0
60 #define USB_STAT_BUS_STAT_CONN 1
61 #define USB_STAT_BUS_STAT_SUSP 2
62 #define USB_STAT_BUS_STAT_CONF 3
63 #define USB_STAT_USB_SS_MODE BIT(4)
64 #define USB_STAT_DEAD_BAT_DET BIT(6)
65 #define USB_STAT_DBP_UNCFG BIT(7)
67 /* BC detect status register */
68 #define DET_STAT_MASK (BIT(7)|BIT(6)|BIT(5))
69 #define DET_STAT_SHIFT 5
70 #define DET_STAT_SDP 1
71 #define DET_STAT_CDP 2
72 #define DET_STAT_DCP 3
74 /* IRQ enable-1 register */
75 #define PWRSRC_IRQ_CFG_MASK (BIT(4)|BIT(3)|BIT(2))
77 /* IRQ enable-6 register */
78 #define BC12_IRQ_CFG_MASK BIT(1)
80 enum axp288_extcon_reg {
81 AXP288_PS_STAT_REG = 0x00,
82 AXP288_PS_BOOT_REASON_REG = 0x02,
83 AXP288_BC_GLOBAL_REG = 0x2c,
84 AXP288_BC_VBUS_CNTL_REG = 0x2d,
85 AXP288_BC_USB_STAT_REG = 0x2e,
86 AXP288_BC_DET_STAT_REG = 0x2f,
87 AXP288_PWRSRC_IRQ_CFG_REG = 0x40,
88 AXP288_BC12_IRQ_CFG_REG = 0x45,
91 enum axp288_mux_select {
92 EXTCON_GPIO_MUX_SEL_PMIC = 0,
93 EXTCON_GPIO_MUX_SEL_SOC,
96 enum axp288_extcon_irq {
104 static const unsigned int axp288_extcon_cables[] = {
111 struct axp288_extcon_info {
113 struct regmap *regmap;
114 struct regmap_irq_chip_data *regmap_irqc;
115 struct axp288_extcon_pdata *pdata;
116 int irq[EXTCON_IRQ_END];
117 struct extcon_dev *edev;
118 struct notifier_block extcon_nb;
122 /* Power up/down reason string array */
123 static char *axp288_pwr_up_down_info[] = {
124 "Last wake caused by user pressing the power button",
125 "Last wake caused by a charger insertion",
126 "Last wake caused by a battery insertion",
127 "Last wake caused by SOC initiated global reset",
128 "Last wake caused by cold reset",
129 "Last shutdown caused by PMIC UVLO threshold",
130 "Last shutdown caused by SOC initiated cold off",
131 "Last shutdown caused by user pressing the power button",
136 * Decode and log the given "reset source indicator" (rsi)
137 * register and then clear it.
139 static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
142 unsigned int val, i, clear_mask = 0;
145 ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
146 for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
148 dev_dbg(info->dev, "%s\n", *rsi);
149 clear_mask |= BIT(i);
153 /* Clear the register value for next reboot (write 1 to clear bit) */
154 regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
157 static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
159 static bool notify_otg, notify_charger;
160 static unsigned int cable;
161 int ret, stat, cfg, pwr_stat;
163 bool vbus_attach = false;
165 ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
167 dev_err(info->dev, "failed to read vbus status\n");
171 vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT);
175 /* Check charger detection completion status */
176 ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
179 if (cfg & BC_GLOBAL_DET_STAT) {
180 dev_dbg(info->dev, "can't complete the charger detection\n");
184 ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
188 chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
192 dev_dbg(info->dev, "sdp cable is connecetd\n");
194 notify_charger = true;
195 cable = EXTCON_CHG_USB_SDP;
198 dev_dbg(info->dev, "cdp cable is connecetd\n");
200 notify_charger = true;
201 cable = EXTCON_CHG_USB_CDP;
204 dev_dbg(info->dev, "dcp cable is connecetd\n");
205 notify_charger = true;
206 cable = EXTCON_CHG_USB_DCP;
210 "disconnect or unknown or ID event\n");
216 * If VBUS is absent Connect D+/D- lines to PMIC for BC
217 * detection. Else connect them to SOC for USB communication.
219 if (info->pdata->gpio_mux_cntl)
220 gpiod_set_value(info->pdata->gpio_mux_cntl,
221 vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
222 : EXTCON_GPIO_MUX_SEL_PMIC);
224 atomic_notifier_call_chain(&info->otg->notifier,
225 vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE, NULL);
229 extcon_set_cable_state_(info->edev, cable, vbus_attach);
231 /* Clear the flags on disconnect event */
233 notify_otg = notify_charger = false;
239 dev_err(info->dev, "failed to detect BC Mod\n");
244 static irqreturn_t axp288_extcon_isr(int irq, void *data)
246 struct axp288_extcon_info *info = data;
249 ret = axp288_handle_chrg_det_event(info);
251 dev_err(info->dev, "failed to handle the interrupt\n");
256 static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
258 /* Unmask VBUS interrupt */
259 regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
260 PWRSRC_IRQ_CFG_MASK);
261 regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
263 /* Unmask the BC1.2 complete interrupts */
264 regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
265 /* Enable the charger detection logic */
266 regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
267 BC_GLOBAL_RUN, BC_GLOBAL_RUN);
270 static int axp288_extcon_probe(struct platform_device *pdev)
272 struct axp288_extcon_info *info;
273 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
274 int ret, i, pirq, gpio;
276 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
280 info->dev = &pdev->dev;
281 info->regmap = axp20x->regmap;
282 info->regmap_irqc = axp20x->regmap_irqc;
283 info->pdata = pdev->dev.platform_data;
286 /* Try ACPI provided pdata via device properties */
287 if (!device_property_present(&pdev->dev,
288 "axp288_extcon_data\n"))
289 dev_err(&pdev->dev, "failed to get platform data\n");
292 platform_set_drvdata(pdev, info);
294 axp288_extcon_log_rsi(info);
296 /* Initialize extcon device */
297 info->edev = devm_extcon_dev_allocate(&pdev->dev,
298 axp288_extcon_cables);
299 if (IS_ERR(info->edev)) {
300 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
301 return PTR_ERR(info->edev);
304 /* Register extcon device */
305 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
307 dev_err(&pdev->dev, "failed to register extcon device\n");
311 /* Get otg transceiver phy */
312 info->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
313 if (IS_ERR(info->otg)) {
314 dev_err(&pdev->dev, "failed to get otg transceiver\n");
315 return PTR_ERR(info->otg);
318 /* Set up gpio control for USB Mux */
319 if (info->pdata->gpio_mux_cntl) {
320 gpio = desc_to_gpio(info->pdata->gpio_mux_cntl);
321 ret = devm_gpio_request(&pdev->dev, gpio, "USB_MUX");
324 "failed to request the gpio=%d\n", gpio);
327 gpiod_direction_output(info->pdata->gpio_mux_cntl,
328 EXTCON_GPIO_MUX_SEL_PMIC);
331 for (i = 0; i < EXTCON_IRQ_END; i++) {
332 pirq = platform_get_irq(pdev, i);
333 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
334 if (info->irq[i] < 0) {
336 "failed to get virtual interrupt=%d\n", pirq);
341 ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],
342 NULL, axp288_extcon_isr,
343 IRQF_ONESHOT | IRQF_NO_SUSPEND,
346 dev_err(&pdev->dev, "failed to request interrupt=%d\n",
352 /* Enable interrupts */
353 axp288_extcon_enable_irq(info);
358 static struct platform_driver axp288_extcon_driver = {
359 .probe = axp288_extcon_probe,
361 .name = "axp288_extcon",
364 module_platform_driver(axp288_extcon_driver);
366 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
367 MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
368 MODULE_LICENSE("GPL v2");