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f0312378 RP |
1 | /* |
2 | * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver | |
3 | * | |
4 | * Copyright (C) 2015 Intel Corporation | |
5 | * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com> | |
6 | * | |
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. | |
10 | * | |
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. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/io.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> | |
31 | ||
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) | |
38 | ||
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) | |
50 | ||
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) | |
55 | ||
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) | |
66 | ||
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 | |
73 | ||
74 | /* IRQ enable-1 register */ | |
75 | #define PWRSRC_IRQ_CFG_MASK (BIT(4)|BIT(3)|BIT(2)) | |
76 | ||
77 | /* IRQ enable-6 register */ | |
78 | #define BC12_IRQ_CFG_MASK BIT(1) | |
79 | ||
f0312378 RP |
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, | |
89 | }; | |
90 | ||
91 | enum axp288_mux_select { | |
92 | EXTCON_GPIO_MUX_SEL_PMIC = 0, | |
93 | EXTCON_GPIO_MUX_SEL_SOC, | |
94 | }; | |
95 | ||
96 | enum axp288_extcon_irq { | |
97 | VBUS_FALLING_IRQ = 0, | |
98 | VBUS_RISING_IRQ, | |
99 | MV_CHNG_IRQ, | |
100 | BC_USB_CHNG_IRQ, | |
101 | EXTCON_IRQ_END, | |
102 | }; | |
103 | ||
73b6ecdb | 104 | static const unsigned int axp288_extcon_cables[] = { |
2a9de9c0 CC |
105 | EXTCON_SLOW_CHARGER, |
106 | EXTCON_CHARGE_DOWNSTREAM, | |
107 | EXTCON_FAST_CHARGER, | |
108 | EXTCON_NONE, | |
f0312378 RP |
109 | }; |
110 | ||
111 | struct axp288_extcon_info { | |
112 | struct device *dev; | |
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; | |
119 | struct usb_phy *otg; | |
120 | }; | |
121 | ||
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", | |
132 | NULL, | |
133 | }; | |
134 | ||
135 | /* | |
136 | * Decode and log the given "reset source indicator" (rsi) | |
137 | * register and then clear it. | |
138 | */ | |
139 | static void axp288_extcon_log_rsi(struct axp288_extcon_info *info) | |
140 | { | |
141 | char **rsi; | |
142 | unsigned int val, i, clear_mask = 0; | |
143 | int ret; | |
144 | ||
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++) { | |
147 | if (val & BIT(i)) { | |
148 | dev_dbg(info->dev, "%s\n", *rsi); | |
149 | clear_mask |= BIT(i); | |
150 | } | |
151 | } | |
152 | ||
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); | |
155 | } | |
156 | ||
157 | static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info) | |
158 | { | |
159 | static bool notify_otg, notify_charger; | |
73b6ecdb | 160 | static unsigned int cable; |
f0312378 RP |
161 | int ret, stat, cfg, pwr_stat; |
162 | u8 chrg_type; | |
163 | bool vbus_attach = false; | |
164 | ||
165 | ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat); | |
166 | if (ret < 0) { | |
167 | dev_err(info->dev, "failed to read vbus status\n"); | |
168 | return ret; | |
169 | } | |
170 | ||
171 | vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT); | |
172 | if (!vbus_attach) | |
173 | goto notify_otg; | |
174 | ||
175 | /* Check charger detection completion status */ | |
176 | ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg); | |
177 | if (ret < 0) | |
178 | goto dev_det_ret; | |
179 | if (cfg & BC_GLOBAL_DET_STAT) { | |
180 | dev_dbg(info->dev, "can't complete the charger detection\n"); | |
181 | goto dev_det_ret; | |
182 | } | |
183 | ||
184 | ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat); | |
185 | if (ret < 0) | |
186 | goto dev_det_ret; | |
187 | ||
188 | chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT; | |
189 | ||
190 | switch (chrg_type) { | |
191 | case DET_STAT_SDP: | |
192 | dev_dbg(info->dev, "sdp cable is connecetd\n"); | |
193 | notify_otg = true; | |
194 | notify_charger = true; | |
2a9de9c0 | 195 | cable = EXTCON_SLOW_CHARGER; |
f0312378 RP |
196 | break; |
197 | case DET_STAT_CDP: | |
198 | dev_dbg(info->dev, "cdp cable is connecetd\n"); | |
199 | notify_otg = true; | |
200 | notify_charger = true; | |
2a9de9c0 | 201 | cable = EXTCON_CHARGE_DOWNSTREAM; |
f0312378 RP |
202 | break; |
203 | case DET_STAT_DCP: | |
204 | dev_dbg(info->dev, "dcp cable is connecetd\n"); | |
205 | notify_charger = true; | |
2a9de9c0 | 206 | cable = EXTCON_FAST_CHARGER; |
f0312378 RP |
207 | break; |
208 | default: | |
209 | dev_warn(info->dev, | |
210 | "disconnect or unknown or ID event\n"); | |
211 | } | |
212 | ||
213 | notify_otg: | |
214 | if (notify_otg) { | |
215 | /* | |
216 | * If VBUS is absent Connect D+/D- lines to PMIC for BC | |
217 | * detection. Else connect them to SOC for USB communication. | |
218 | */ | |
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); | |
223 | ||
224 | atomic_notifier_call_chain(&info->otg->notifier, | |
225 | vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE, NULL); | |
226 | } | |
227 | ||
228 | if (notify_charger) | |
2a9de9c0 | 229 | extcon_set_cable_state_(info->edev, cable, vbus_attach); |
f0312378 RP |
230 | |
231 | /* Clear the flags on disconnect event */ | |
232 | if (!vbus_attach) | |
233 | notify_otg = notify_charger = false; | |
234 | ||
235 | return 0; | |
236 | ||
237 | dev_det_ret: | |
238 | if (ret < 0) | |
239 | dev_err(info->dev, "failed to detect BC Mod\n"); | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static irqreturn_t axp288_extcon_isr(int irq, void *data) | |
245 | { | |
246 | struct axp288_extcon_info *info = data; | |
247 | int ret; | |
248 | ||
249 | ret = axp288_handle_chrg_det_event(info); | |
250 | if (ret < 0) | |
251 | dev_err(info->dev, "failed to handle the interrupt\n"); | |
252 | ||
253 | return IRQ_HANDLED; | |
254 | } | |
255 | ||
256 | static void axp288_extcon_enable_irq(struct axp288_extcon_info *info) | |
257 | { | |
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, | |
262 | BC_GLOBAL_RUN, 0); | |
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); | |
268 | } | |
269 | ||
270 | static int axp288_extcon_probe(struct platform_device *pdev) | |
271 | { | |
272 | struct axp288_extcon_info *info; | |
273 | struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); | |
274 | int ret, i, pirq, gpio; | |
275 | ||
276 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
277 | if (!info) | |
278 | return -ENOMEM; | |
279 | ||
280 | info->dev = &pdev->dev; | |
281 | info->regmap = axp20x->regmap; | |
282 | info->regmap_irqc = axp20x->regmap_irqc; | |
283 | info->pdata = pdev->dev.platform_data; | |
284 | ||
285 | if (!info->pdata) { | |
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"); | |
290 | return -ENODEV; | |
291 | } | |
292 | platform_set_drvdata(pdev, info); | |
293 | ||
294 | axp288_extcon_log_rsi(info); | |
295 | ||
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); | |
302 | } | |
303 | ||
304 | /* Register extcon device */ | |
305 | ret = devm_extcon_dev_register(&pdev->dev, info->edev); | |
306 | if (ret) { | |
307 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* Get otg transceiver phy */ | |
312 | info->otg = usb_get_phy(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); | |
316 | } | |
317 | ||
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 = gpio_request(gpio, "USB_MUX"); | |
322 | if (ret < 0) { | |
323 | dev_err(&pdev->dev, | |
324 | "failed to request the gpio=%d\n", gpio); | |
325 | goto gpio_req_failed; | |
326 | } | |
327 | gpiod_direction_output(info->pdata->gpio_mux_cntl, | |
328 | EXTCON_GPIO_MUX_SEL_PMIC); | |
329 | } | |
330 | ||
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) { | |
335 | dev_err(&pdev->dev, | |
336 | "failed to get virtual interrupt=%d\n", pirq); | |
337 | ret = info->irq[i]; | |
338 | goto gpio_req_failed; | |
339 | } | |
340 | ||
341 | ret = devm_request_threaded_irq(&pdev->dev, info->irq[i], | |
342 | NULL, axp288_extcon_isr, | |
343 | IRQF_ONESHOT | IRQF_NO_SUSPEND, | |
344 | pdev->name, info); | |
345 | if (ret) { | |
346 | dev_err(&pdev->dev, "failed to request interrupt=%d\n", | |
347 | info->irq[i]); | |
348 | goto gpio_req_failed; | |
349 | } | |
350 | } | |
351 | ||
352 | /* Enable interrupts */ | |
353 | axp288_extcon_enable_irq(info); | |
354 | ||
355 | return 0; | |
356 | ||
357 | gpio_req_failed: | |
358 | usb_put_phy(info->otg); | |
359 | return ret; | |
360 | } | |
361 | ||
362 | static int axp288_extcon_remove(struct platform_device *pdev) | |
363 | { | |
364 | struct axp288_extcon_info *info = platform_get_drvdata(pdev); | |
365 | ||
366 | usb_put_phy(info->otg); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static struct platform_driver axp288_extcon_driver = { | |
371 | .probe = axp288_extcon_probe, | |
372 | .remove = axp288_extcon_remove, | |
373 | .driver = { | |
374 | .name = "axp288_extcon", | |
375 | }, | |
376 | }; | |
377 | module_platform_driver(axp288_extcon_driver); | |
378 | ||
379 | MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); | |
380 | MODULE_DESCRIPTION("X-Powers AXP288 extcon driver"); | |
381 | MODULE_LICENSE("GPL v2"); |