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 #define AXP288_EXTCON_SLOW_CHARGER "SLOW-CHARGER"
81 #define AXP288_EXTCON_DOWNSTREAM_CHARGER "CHARGE-DOWNSTREAM"
82 #define AXP288_EXTCON_FAST_CHARGER "FAST-CHARGER"
84 enum axp288_extcon_reg {
85 AXP288_PS_STAT_REG = 0x00,
86 AXP288_PS_BOOT_REASON_REG = 0x02,
87 AXP288_BC_GLOBAL_REG = 0x2c,
88 AXP288_BC_VBUS_CNTL_REG = 0x2d,
89 AXP288_BC_USB_STAT_REG = 0x2e,
90 AXP288_BC_DET_STAT_REG = 0x2f,
91 AXP288_PWRSRC_IRQ_CFG_REG = 0x40,
92 AXP288_BC12_IRQ_CFG_REG = 0x45,
95 enum axp288_mux_select {
96 EXTCON_GPIO_MUX_SEL_PMIC = 0,
97 EXTCON_GPIO_MUX_SEL_SOC,
100 enum axp288_extcon_irq {
101 VBUS_FALLING_IRQ = 0,
108 static const char *axp288_extcon_cables[] = {
109 AXP288_EXTCON_SLOW_CHARGER,
110 AXP288_EXTCON_DOWNSTREAM_CHARGER,
111 AXP288_EXTCON_FAST_CHARGER,
115 struct axp288_extcon_info {
117 struct regmap *regmap;
118 struct regmap_irq_chip_data *regmap_irqc;
119 struct axp288_extcon_pdata *pdata;
120 int irq[EXTCON_IRQ_END];
121 struct extcon_dev *edev;
122 struct notifier_block extcon_nb;
126 /* Power up/down reason string array */
127 static char *axp288_pwr_up_down_info[] = {
128 "Last wake caused by user pressing the power button",
129 "Last wake caused by a charger insertion",
130 "Last wake caused by a battery insertion",
131 "Last wake caused by SOC initiated global reset",
132 "Last wake caused by cold reset",
133 "Last shutdown caused by PMIC UVLO threshold",
134 "Last shutdown caused by SOC initiated cold off",
135 "Last shutdown caused by user pressing the power button",
140 * Decode and log the given "reset source indicator" (rsi)
141 * register and then clear it.
143 static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
146 unsigned int val, i, clear_mask = 0;
149 ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
150 for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
152 dev_dbg(info->dev, "%s\n", *rsi);
153 clear_mask |= BIT(i);
157 /* Clear the register value for next reboot (write 1 to clear bit) */
158 regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
161 static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
163 static bool notify_otg, notify_charger;
165 int ret, stat, cfg, pwr_stat;
167 bool vbus_attach = false;
169 ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
171 dev_err(info->dev, "failed to read vbus status\n");
175 vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT);
179 /* Check charger detection completion status */
180 ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
183 if (cfg & BC_GLOBAL_DET_STAT) {
184 dev_dbg(info->dev, "can't complete the charger detection\n");
188 ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
192 chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
196 dev_dbg(info->dev, "sdp cable is connecetd\n");
198 notify_charger = true;
199 cable = AXP288_EXTCON_SLOW_CHARGER;
202 dev_dbg(info->dev, "cdp cable is connecetd\n");
204 notify_charger = true;
205 cable = AXP288_EXTCON_DOWNSTREAM_CHARGER;
208 dev_dbg(info->dev, "dcp cable is connecetd\n");
209 notify_charger = true;
210 cable = AXP288_EXTCON_FAST_CHARGER;
214 "disconnect or unknown or ID event\n");
220 * If VBUS is absent Connect D+/D- lines to PMIC for BC
221 * detection. Else connect them to SOC for USB communication.
223 if (info->pdata->gpio_mux_cntl)
224 gpiod_set_value(info->pdata->gpio_mux_cntl,
225 vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
226 : EXTCON_GPIO_MUX_SEL_PMIC);
228 atomic_notifier_call_chain(&info->otg->notifier,
229 vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE, NULL);
233 extcon_set_cable_state(info->edev, cable, vbus_attach);
235 /* Clear the flags on disconnect event */
237 notify_otg = notify_charger = false;
243 dev_err(info->dev, "failed to detect BC Mod\n");
248 static irqreturn_t axp288_extcon_isr(int irq, void *data)
250 struct axp288_extcon_info *info = data;
253 ret = axp288_handle_chrg_det_event(info);
255 dev_err(info->dev, "failed to handle the interrupt\n");
260 static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
262 /* Unmask VBUS interrupt */
263 regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
264 PWRSRC_IRQ_CFG_MASK);
265 regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
267 /* Unmask the BC1.2 complete interrupts */
268 regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
269 /* Enable the charger detection logic */
270 regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
271 BC_GLOBAL_RUN, BC_GLOBAL_RUN);
274 static int axp288_extcon_probe(struct platform_device *pdev)
276 struct axp288_extcon_info *info;
277 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
278 int ret, i, pirq, gpio;
280 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
284 info->dev = &pdev->dev;
285 info->regmap = axp20x->regmap;
286 info->regmap_irqc = axp20x->regmap_irqc;
287 info->pdata = pdev->dev.platform_data;
290 /* Try ACPI provided pdata via device properties */
291 if (!device_property_present(&pdev->dev,
292 "axp288_extcon_data\n"))
293 dev_err(&pdev->dev, "failed to get platform data\n");
296 platform_set_drvdata(pdev, info);
298 axp288_extcon_log_rsi(info);
300 /* Initialize extcon device */
301 info->edev = devm_extcon_dev_allocate(&pdev->dev,
302 axp288_extcon_cables);
303 if (IS_ERR(info->edev)) {
304 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
305 return PTR_ERR(info->edev);
308 /* Register extcon device */
309 ret = devm_extcon_dev_register(&pdev->dev, info->edev);
311 dev_err(&pdev->dev, "failed to register extcon device\n");
315 /* Get otg transceiver phy */
316 info->otg = usb_get_phy(USB_PHY_TYPE_USB2);
317 if (IS_ERR(info->otg)) {
318 dev_err(&pdev->dev, "failed to get otg transceiver\n");
319 return PTR_ERR(info->otg);
322 /* Set up gpio control for USB Mux */
323 if (info->pdata->gpio_mux_cntl) {
324 gpio = desc_to_gpio(info->pdata->gpio_mux_cntl);
325 ret = gpio_request(gpio, "USB_MUX");
328 "failed to request the gpio=%d\n", gpio);
329 goto gpio_req_failed;
331 gpiod_direction_output(info->pdata->gpio_mux_cntl,
332 EXTCON_GPIO_MUX_SEL_PMIC);
335 for (i = 0; i < EXTCON_IRQ_END; i++) {
336 pirq = platform_get_irq(pdev, i);
337 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
338 if (info->irq[i] < 0) {
340 "failed to get virtual interrupt=%d\n", pirq);
342 goto gpio_req_failed;
345 ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],
346 NULL, axp288_extcon_isr,
347 IRQF_ONESHOT | IRQF_NO_SUSPEND,
350 dev_err(&pdev->dev, "failed to request interrupt=%d\n",
352 goto gpio_req_failed;
356 /* Enable interrupts */
357 axp288_extcon_enable_irq(info);
362 usb_put_phy(info->otg);
366 static int axp288_extcon_remove(struct platform_device *pdev)
368 struct axp288_extcon_info *info = platform_get_drvdata(pdev);
370 usb_put_phy(info->otg);
374 static struct platform_driver axp288_extcon_driver = {
375 .probe = axp288_extcon_probe,
376 .remove = axp288_extcon_remove,
378 .name = "axp288_extcon",
381 module_platform_driver(axp288_extcon_driver);
383 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
384 MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
385 MODULE_LICENSE("GPL v2");