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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> | |
f0312378 | 24 | #include <linux/notifier.h> |
176aa360 | 25 | #include <linux/extcon-provider.h> |
f0312378 RP |
26 | #include <linux/regmap.h> |
27 | #include <linux/gpio.h> | |
28 | #include <linux/gpio/consumer.h> | |
29 | #include <linux/mfd/axp20x.h> | |
30 | ||
31 | /* Power source status register */ | |
32 | #define PS_STAT_VBUS_TRIGGER BIT(0) | |
33 | #define PS_STAT_BAT_CHRG_DIR BIT(2) | |
34 | #define PS_STAT_VBUS_ABOVE_VHOLD BIT(3) | |
35 | #define PS_STAT_VBUS_VALID BIT(4) | |
36 | #define PS_STAT_VBUS_PRESENT BIT(5) | |
37 | ||
38 | /* BC module global register */ | |
39 | #define BC_GLOBAL_RUN BIT(0) | |
40 | #define BC_GLOBAL_DET_STAT BIT(2) | |
41 | #define BC_GLOBAL_DBP_TOUT BIT(3) | |
42 | #define BC_GLOBAL_VLGC_COM_SEL BIT(4) | |
43 | #define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)|BIT(5)) | |
44 | #define BC_GLOBAL_DCD_TOUT_300MS 0 | |
45 | #define BC_GLOBAL_DCD_TOUT_100MS 1 | |
46 | #define BC_GLOBAL_DCD_TOUT_500MS 2 | |
47 | #define BC_GLOBAL_DCD_TOUT_900MS 3 | |
48 | #define BC_GLOBAL_DCD_DET_SEL BIT(7) | |
49 | ||
50 | /* BC module vbus control and status register */ | |
51 | #define VBUS_CNTL_DPDM_PD_EN BIT(4) | |
52 | #define VBUS_CNTL_DPDM_FD_EN BIT(5) | |
53 | #define VBUS_CNTL_FIRST_PO_STAT BIT(6) | |
54 | ||
55 | /* BC USB status register */ | |
56 | #define USB_STAT_BUS_STAT_MASK (BIT(3)|BIT(2)|BIT(1)|BIT(0)) | |
57 | #define USB_STAT_BUS_STAT_SHIFT 0 | |
58 | #define USB_STAT_BUS_STAT_ATHD 0 | |
59 | #define USB_STAT_BUS_STAT_CONN 1 | |
60 | #define USB_STAT_BUS_STAT_SUSP 2 | |
61 | #define USB_STAT_BUS_STAT_CONF 3 | |
62 | #define USB_STAT_USB_SS_MODE BIT(4) | |
63 | #define USB_STAT_DEAD_BAT_DET BIT(6) | |
64 | #define USB_STAT_DBP_UNCFG BIT(7) | |
65 | ||
66 | /* BC detect status register */ | |
67 | #define DET_STAT_MASK (BIT(7)|BIT(6)|BIT(5)) | |
68 | #define DET_STAT_SHIFT 5 | |
69 | #define DET_STAT_SDP 1 | |
70 | #define DET_STAT_CDP 2 | |
71 | #define DET_STAT_DCP 3 | |
72 | ||
f0312378 RP |
73 | enum axp288_extcon_reg { |
74 | AXP288_PS_STAT_REG = 0x00, | |
75 | AXP288_PS_BOOT_REASON_REG = 0x02, | |
76 | AXP288_BC_GLOBAL_REG = 0x2c, | |
77 | AXP288_BC_VBUS_CNTL_REG = 0x2d, | |
78 | AXP288_BC_USB_STAT_REG = 0x2e, | |
79 | AXP288_BC_DET_STAT_REG = 0x2f, | |
f0312378 RP |
80 | }; |
81 | ||
82 | enum axp288_mux_select { | |
83 | EXTCON_GPIO_MUX_SEL_PMIC = 0, | |
84 | EXTCON_GPIO_MUX_SEL_SOC, | |
85 | }; | |
86 | ||
87 | enum axp288_extcon_irq { | |
88 | VBUS_FALLING_IRQ = 0, | |
89 | VBUS_RISING_IRQ, | |
90 | MV_CHNG_IRQ, | |
91 | BC_USB_CHNG_IRQ, | |
92 | EXTCON_IRQ_END, | |
93 | }; | |
94 | ||
73b6ecdb | 95 | static const unsigned int axp288_extcon_cables[] = { |
11eecf91 CC |
96 | EXTCON_CHG_USB_SDP, |
97 | EXTCON_CHG_USB_CDP, | |
98 | EXTCON_CHG_USB_DCP, | |
5298b836 | 99 | EXTCON_USB, |
2a9de9c0 | 100 | EXTCON_NONE, |
f0312378 RP |
101 | }; |
102 | ||
103 | struct axp288_extcon_info { | |
104 | struct device *dev; | |
105 | struct regmap *regmap; | |
106 | struct regmap_irq_chip_data *regmap_irqc; | |
76884241 | 107 | struct gpio_desc *gpio_mux_cntl; |
f0312378 RP |
108 | int irq[EXTCON_IRQ_END]; |
109 | struct extcon_dev *edev; | |
110 | struct notifier_block extcon_nb; | |
5d2199ea | 111 | unsigned int previous_cable; |
f0312378 RP |
112 | }; |
113 | ||
114 | /* Power up/down reason string array */ | |
115 | static char *axp288_pwr_up_down_info[] = { | |
116 | "Last wake caused by user pressing the power button", | |
117 | "Last wake caused by a charger insertion", | |
118 | "Last wake caused by a battery insertion", | |
119 | "Last wake caused by SOC initiated global reset", | |
120 | "Last wake caused by cold reset", | |
121 | "Last shutdown caused by PMIC UVLO threshold", | |
122 | "Last shutdown caused by SOC initiated cold off", | |
123 | "Last shutdown caused by user pressing the power button", | |
124 | NULL, | |
125 | }; | |
126 | ||
127 | /* | |
128 | * Decode and log the given "reset source indicator" (rsi) | |
129 | * register and then clear it. | |
130 | */ | |
131 | static void axp288_extcon_log_rsi(struct axp288_extcon_info *info) | |
132 | { | |
133 | char **rsi; | |
134 | unsigned int val, i, clear_mask = 0; | |
135 | int ret; | |
136 | ||
137 | ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val); | |
138 | for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) { | |
139 | if (val & BIT(i)) { | |
140 | dev_dbg(info->dev, "%s\n", *rsi); | |
141 | clear_mask |= BIT(i); | |
142 | } | |
143 | } | |
144 | ||
145 | /* Clear the register value for next reboot (write 1 to clear bit) */ | |
146 | regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask); | |
147 | } | |
148 | ||
149 | static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info) | |
150 | { | |
f0312378 RP |
151 | int ret, stat, cfg, pwr_stat; |
152 | u8 chrg_type; | |
5d2199ea | 153 | unsigned int cable = info->previous_cable; |
f0312378 RP |
154 | bool vbus_attach = false; |
155 | ||
156 | ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat); | |
157 | if (ret < 0) { | |
158 | dev_err(info->dev, "failed to read vbus status\n"); | |
159 | return ret; | |
160 | } | |
161 | ||
5757aca1 | 162 | vbus_attach = (pwr_stat & PS_STAT_VBUS_VALID); |
f0312378 | 163 | if (!vbus_attach) |
3fe1e0e2 | 164 | goto no_vbus; |
f0312378 RP |
165 | |
166 | /* Check charger detection completion status */ | |
167 | ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg); | |
168 | if (ret < 0) | |
169 | goto dev_det_ret; | |
170 | if (cfg & BC_GLOBAL_DET_STAT) { | |
171 | dev_dbg(info->dev, "can't complete the charger detection\n"); | |
172 | goto dev_det_ret; | |
173 | } | |
174 | ||
175 | ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat); | |
176 | if (ret < 0) | |
177 | goto dev_det_ret; | |
178 | ||
179 | chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT; | |
180 | ||
181 | switch (chrg_type) { | |
182 | case DET_STAT_SDP: | |
525867db | 183 | dev_dbg(info->dev, "sdp cable is connected\n"); |
11eecf91 | 184 | cable = EXTCON_CHG_USB_SDP; |
f0312378 RP |
185 | break; |
186 | case DET_STAT_CDP: | |
525867db | 187 | dev_dbg(info->dev, "cdp cable is connected\n"); |
11eecf91 | 188 | cable = EXTCON_CHG_USB_CDP; |
f0312378 RP |
189 | break; |
190 | case DET_STAT_DCP: | |
525867db | 191 | dev_dbg(info->dev, "dcp cable is connected\n"); |
11eecf91 | 192 | cable = EXTCON_CHG_USB_DCP; |
f0312378 RP |
193 | break; |
194 | default: | |
195 | dev_warn(info->dev, | |
196 | "disconnect or unknown or ID event\n"); | |
197 | } | |
198 | ||
3fe1e0e2 HG |
199 | no_vbus: |
200 | /* | |
201 | * If VBUS is absent Connect D+/D- lines to PMIC for BC | |
202 | * detection. Else connect them to SOC for USB communication. | |
203 | */ | |
204 | if (info->gpio_mux_cntl) | |
205 | gpiod_set_value(info->gpio_mux_cntl, | |
206 | vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC | |
207 | : EXTCON_GPIO_MUX_SEL_PMIC); | |
208 | ||
5d2199ea | 209 | extcon_set_state_sync(info->edev, info->previous_cable, false); |
5298b836 BW |
210 | if (info->previous_cable == EXTCON_CHG_USB_SDP) |
211 | extcon_set_state_sync(info->edev, EXTCON_USB, false); | |
212 | ||
5d2199ea HG |
213 | if (vbus_attach) { |
214 | extcon_set_state_sync(info->edev, cable, vbus_attach); | |
5298b836 BW |
215 | if (cable == EXTCON_CHG_USB_SDP) |
216 | extcon_set_state_sync(info->edev, EXTCON_USB, | |
217 | vbus_attach); | |
218 | ||
5d2199ea HG |
219 | info->previous_cable = cable; |
220 | } | |
f0312378 RP |
221 | |
222 | return 0; | |
223 | ||
224 | dev_det_ret: | |
225 | if (ret < 0) | |
226 | dev_err(info->dev, "failed to detect BC Mod\n"); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | static irqreturn_t axp288_extcon_isr(int irq, void *data) | |
232 | { | |
233 | struct axp288_extcon_info *info = data; | |
234 | int ret; | |
235 | ||
236 | ret = axp288_handle_chrg_det_event(info); | |
237 | if (ret < 0) | |
238 | dev_err(info->dev, "failed to handle the interrupt\n"); | |
239 | ||
240 | return IRQ_HANDLED; | |
241 | } | |
242 | ||
be174952 | 243 | static void axp288_extcon_enable(struct axp288_extcon_info *info) |
f0312378 | 244 | { |
f0312378 RP |
245 | regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG, |
246 | BC_GLOBAL_RUN, 0); | |
f0312378 RP |
247 | /* Enable the charger detection logic */ |
248 | regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG, | |
249 | BC_GLOBAL_RUN, BC_GLOBAL_RUN); | |
250 | } | |
251 | ||
252 | static int axp288_extcon_probe(struct platform_device *pdev) | |
253 | { | |
254 | struct axp288_extcon_info *info; | |
255 | struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); | |
76884241 | 256 | struct axp288_extcon_pdata *pdata = pdev->dev.platform_data; |
f0312378 RP |
257 | int ret, i, pirq, gpio; |
258 | ||
259 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
260 | if (!info) | |
261 | return -ENOMEM; | |
262 | ||
263 | info->dev = &pdev->dev; | |
264 | info->regmap = axp20x->regmap; | |
265 | info->regmap_irqc = axp20x->regmap_irqc; | |
5d2199ea | 266 | info->previous_cable = EXTCON_NONE; |
76884241 HG |
267 | if (pdata) |
268 | info->gpio_mux_cntl = pdata->gpio_mux_cntl; | |
269 | ||
f0312378 RP |
270 | platform_set_drvdata(pdev, info); |
271 | ||
272 | axp288_extcon_log_rsi(info); | |
273 | ||
274 | /* Initialize extcon device */ | |
275 | info->edev = devm_extcon_dev_allocate(&pdev->dev, | |
276 | axp288_extcon_cables); | |
277 | if (IS_ERR(info->edev)) { | |
278 | dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); | |
279 | return PTR_ERR(info->edev); | |
280 | } | |
281 | ||
282 | /* Register extcon device */ | |
283 | ret = devm_extcon_dev_register(&pdev->dev, info->edev); | |
284 | if (ret) { | |
285 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
286 | return ret; | |
287 | } | |
288 | ||
f0312378 | 289 | /* Set up gpio control for USB Mux */ |
76884241 HG |
290 | if (info->gpio_mux_cntl) { |
291 | gpio = desc_to_gpio(info->gpio_mux_cntl); | |
4bf27b70 | 292 | ret = devm_gpio_request(&pdev->dev, gpio, "USB_MUX"); |
f0312378 RP |
293 | if (ret < 0) { |
294 | dev_err(&pdev->dev, | |
295 | "failed to request the gpio=%d\n", gpio); | |
4bf27b70 | 296 | return ret; |
f0312378 | 297 | } |
76884241 | 298 | gpiod_direction_output(info->gpio_mux_cntl, |
f0312378 RP |
299 | EXTCON_GPIO_MUX_SEL_PMIC); |
300 | } | |
301 | ||
302 | for (i = 0; i < EXTCON_IRQ_END; i++) { | |
303 | pirq = platform_get_irq(pdev, i); | |
304 | info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq); | |
305 | if (info->irq[i] < 0) { | |
306 | dev_err(&pdev->dev, | |
307 | "failed to get virtual interrupt=%d\n", pirq); | |
308 | ret = info->irq[i]; | |
4bf27b70 | 309 | return ret; |
f0312378 RP |
310 | } |
311 | ||
312 | ret = devm_request_threaded_irq(&pdev->dev, info->irq[i], | |
313 | NULL, axp288_extcon_isr, | |
314 | IRQF_ONESHOT | IRQF_NO_SUSPEND, | |
315 | pdev->name, info); | |
316 | if (ret) { | |
317 | dev_err(&pdev->dev, "failed to request interrupt=%d\n", | |
318 | info->irq[i]); | |
4bf27b70 | 319 | return ret; |
f0312378 RP |
320 | } |
321 | } | |
322 | ||
be174952 HG |
323 | /* Start charger cable type detection */ |
324 | axp288_extcon_enable(info); | |
f0312378 RP |
325 | |
326 | return 0; | |
f0312378 RP |
327 | } |
328 | ||
dd3a55fc HG |
329 | static const struct platform_device_id axp288_extcon_table[] = { |
330 | { .name = "axp288_extcon" }, | |
331 | {}, | |
332 | }; | |
333 | MODULE_DEVICE_TABLE(platform, axp288_extcon_table); | |
334 | ||
f0312378 RP |
335 | static struct platform_driver axp288_extcon_driver = { |
336 | .probe = axp288_extcon_probe, | |
dd3a55fc | 337 | .id_table = axp288_extcon_table, |
f0312378 RP |
338 | .driver = { |
339 | .name = "axp288_extcon", | |
340 | }, | |
341 | }; | |
342 | module_platform_driver(axp288_extcon_driver); | |
343 | ||
344 | MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); | |
345 | MODULE_DESCRIPTION("X-Powers AXP288 extcon driver"); | |
346 | MODULE_LICENSE("GPL v2"); |