1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * extcon driver for Basin Cove PMIC 4 * 5 * Copyright (c) 2019, Intel Corporation. 6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> 7 */ 8 9 #include <linux/extcon-provider.h> 10 #include <linux/interrupt.h> 11 #include <linux/mfd/intel_soc_pmic.h> 12 #include <linux/mfd/intel_soc_pmic_mrfld.h> 13 #include <linux/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/regmap.h> 17 18 #include "extcon-intel.h" 19 20 #define BCOVE_USBIDCTRL 0x19 21 #define BCOVE_USBIDCTRL_ID BIT(0) 22 #define BCOVE_USBIDCTRL_ACA BIT(1) 23 #define BCOVE_USBIDCTRL_ALL (BCOVE_USBIDCTRL_ID | BCOVE_USBIDCTRL_ACA) 24 25 #define BCOVE_USBIDSTS 0x1a 26 #define BCOVE_USBIDSTS_GND BIT(0) 27 #define BCOVE_USBIDSTS_RARBRC_MASK GENMASK(2, 1) 28 #define BCOVE_USBIDSTS_RARBRC_SHIFT 1 29 #define BCOVE_USBIDSTS_NO_ACA 0 30 #define BCOVE_USBIDSTS_R_ID_A 1 31 #define BCOVE_USBIDSTS_R_ID_B 2 32 #define BCOVE_USBIDSTS_R_ID_C 3 33 #define BCOVE_USBIDSTS_FLOAT BIT(3) 34 #define BCOVE_USBIDSTS_SHORT BIT(4) 35 36 #define BCOVE_CHGRIRQ_ALL (BCOVE_CHGRIRQ_VBUSDET | BCOVE_CHGRIRQ_DCDET | \ 37 BCOVE_CHGRIRQ_BATTDET | BCOVE_CHGRIRQ_USBIDDET) 38 39 #define BCOVE_CHGRCTRL0 0x4b 40 #define BCOVE_CHGRCTRL0_CHGRRESET BIT(0) 41 #define BCOVE_CHGRCTRL0_EMRGCHREN BIT(1) 42 #define BCOVE_CHGRCTRL0_EXTCHRDIS BIT(2) 43 #define BCOVE_CHGRCTRL0_SWCONTROL BIT(3) 44 #define BCOVE_CHGRCTRL0_TTLCK BIT(4) 45 #define BCOVE_CHGRCTRL0_BIT_5 BIT(5) 46 #define BCOVE_CHGRCTRL0_BIT_6 BIT(6) 47 #define BCOVE_CHGRCTRL0_CHR_WDT_NOKICK BIT(7) 48 49 struct mrfld_extcon_data { 50 struct device *dev; 51 struct regmap *regmap; 52 struct extcon_dev *edev; 53 unsigned int status; 54 unsigned int id; 55 }; 56 57 static const unsigned int mrfld_extcon_cable[] = { 58 EXTCON_USB, 59 EXTCON_USB_HOST, 60 EXTCON_CHG_USB_SDP, 61 EXTCON_CHG_USB_CDP, 62 EXTCON_CHG_USB_DCP, 63 EXTCON_CHG_USB_ACA, 64 EXTCON_NONE, 65 }; 66 67 static int mrfld_extcon_clear(struct mrfld_extcon_data *data, unsigned int reg, 68 unsigned int mask) 69 { 70 return regmap_update_bits(data->regmap, reg, mask, 0x00); 71 } 72 73 static int mrfld_extcon_set(struct mrfld_extcon_data *data, unsigned int reg, 74 unsigned int mask) 75 { 76 return regmap_update_bits(data->regmap, reg, mask, 0xff); 77 } 78 79 static int mrfld_extcon_sw_control(struct mrfld_extcon_data *data, bool enable) 80 { 81 unsigned int mask = BCOVE_CHGRCTRL0_SWCONTROL; 82 struct device *dev = data->dev; 83 int ret; 84 85 if (enable) 86 ret = mrfld_extcon_set(data, BCOVE_CHGRCTRL0, mask); 87 else 88 ret = mrfld_extcon_clear(data, BCOVE_CHGRCTRL0, mask); 89 if (ret) 90 dev_err(dev, "can't set SW control: %d\n", ret); 91 return ret; 92 } 93 94 static int mrfld_extcon_get_id(struct mrfld_extcon_data *data) 95 { 96 struct regmap *regmap = data->regmap; 97 unsigned int id; 98 bool ground; 99 int ret; 100 101 ret = regmap_read(regmap, BCOVE_USBIDSTS, &id); 102 if (ret) 103 return ret; 104 105 if (id & BCOVE_USBIDSTS_FLOAT) 106 return INTEL_USB_ID_FLOAT; 107 108 switch ((id & BCOVE_USBIDSTS_RARBRC_MASK) >> BCOVE_USBIDSTS_RARBRC_SHIFT) { 109 case BCOVE_USBIDSTS_R_ID_A: 110 return INTEL_USB_RID_A; 111 case BCOVE_USBIDSTS_R_ID_B: 112 return INTEL_USB_RID_B; 113 case BCOVE_USBIDSTS_R_ID_C: 114 return INTEL_USB_RID_C; 115 } 116 117 /* 118 * PMIC A0 reports USBIDSTS_GND = 1 for ID_GND, 119 * but PMIC B0 reports USBIDSTS_GND = 0 for ID_GND. 120 * Thus we must check this bit at last. 121 */ 122 ground = id & BCOVE_USBIDSTS_GND; 123 switch ('A' + BCOVE_MAJOR(data->id)) { 124 case 'A': 125 return ground ? INTEL_USB_ID_GND : INTEL_USB_ID_FLOAT; 126 case 'B': 127 return ground ? INTEL_USB_ID_FLOAT : INTEL_USB_ID_GND; 128 } 129 130 /* Unknown or unsupported type */ 131 return INTEL_USB_ID_FLOAT; 132 } 133 134 static int mrfld_extcon_role_detect(struct mrfld_extcon_data *data) 135 { 136 unsigned int id; 137 bool usb_host; 138 int ret; 139 140 ret = mrfld_extcon_get_id(data); 141 if (ret < 0) 142 return ret; 143 144 id = ret; 145 146 usb_host = (id == INTEL_USB_ID_GND) || (id == INTEL_USB_RID_A); 147 extcon_set_state_sync(data->edev, EXTCON_USB_HOST, usb_host); 148 149 return 0; 150 } 151 152 static int mrfld_extcon_cable_detect(struct mrfld_extcon_data *data) 153 { 154 struct regmap *regmap = data->regmap; 155 unsigned int status, change; 156 int ret; 157 158 /* 159 * It seems SCU firmware clears the content of BCOVE_CHGRIRQ1 160 * and makes it useless for OS. Instead we compare a previously 161 * stored status to the current one, provided by BCOVE_SCHGRIRQ1. 162 */ 163 ret = regmap_read(regmap, BCOVE_SCHGRIRQ1, &status); 164 if (ret) 165 return ret; 166 167 change = status ^ data->status; 168 if (!change) 169 return -ENODATA; 170 171 if (change & BCOVE_CHGRIRQ_USBIDDET) { 172 ret = mrfld_extcon_role_detect(data); 173 if (ret) 174 return ret; 175 } 176 177 data->status = status; 178 179 return 0; 180 } 181 182 static irqreturn_t mrfld_extcon_interrupt(int irq, void *dev_id) 183 { 184 struct mrfld_extcon_data *data = dev_id; 185 int ret; 186 187 ret = mrfld_extcon_cable_detect(data); 188 189 mrfld_extcon_clear(data, BCOVE_MIRQLVL1, BCOVE_LVL1_CHGR); 190 191 return ret ? IRQ_NONE: IRQ_HANDLED; 192 } 193 194 static int mrfld_extcon_probe(struct platform_device *pdev) 195 { 196 struct device *dev = &pdev->dev; 197 struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent); 198 struct regmap *regmap = pmic->regmap; 199 struct mrfld_extcon_data *data; 200 unsigned int id; 201 int irq, ret; 202 203 irq = platform_get_irq(pdev, 0); 204 if (irq < 0) 205 return irq; 206 207 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 208 if (!data) 209 return -ENOMEM; 210 211 data->dev = dev; 212 data->regmap = regmap; 213 214 data->edev = devm_extcon_dev_allocate(dev, mrfld_extcon_cable); 215 if (IS_ERR(data->edev)) 216 return -ENOMEM; 217 218 ret = devm_extcon_dev_register(dev, data->edev); 219 if (ret < 0) { 220 dev_err(dev, "can't register extcon device: %d\n", ret); 221 return ret; 222 } 223 224 ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_extcon_interrupt, 225 IRQF_ONESHOT | IRQF_SHARED, pdev->name, 226 data); 227 if (ret) { 228 dev_err(dev, "can't register IRQ handler: %d\n", ret); 229 return ret; 230 } 231 232 ret = regmap_read(regmap, BCOVE_ID, &id); 233 if (ret) { 234 dev_err(dev, "can't read PMIC ID: %d\n", ret); 235 return ret; 236 } 237 238 data->id = id; 239 240 ret = mrfld_extcon_sw_control(data, true); 241 if (ret) 242 return ret; 243 244 /* Get initial state */ 245 mrfld_extcon_role_detect(data); 246 247 mrfld_extcon_clear(data, BCOVE_MIRQLVL1, BCOVE_LVL1_CHGR); 248 mrfld_extcon_clear(data, BCOVE_MCHGRIRQ1, BCOVE_CHGRIRQ_ALL); 249 250 mrfld_extcon_set(data, BCOVE_USBIDCTRL, BCOVE_USBIDCTRL_ALL); 251 252 platform_set_drvdata(pdev, data); 253 254 return 0; 255 } 256 257 static int mrfld_extcon_remove(struct platform_device *pdev) 258 { 259 struct mrfld_extcon_data *data = platform_get_drvdata(pdev); 260 261 mrfld_extcon_sw_control(data, false); 262 263 return 0; 264 } 265 266 static const struct platform_device_id mrfld_extcon_id_table[] = { 267 { .name = "mrfld_bcove_pwrsrc" }, 268 {} 269 }; 270 MODULE_DEVICE_TABLE(platform, mrfld_extcon_id_table); 271 272 static struct platform_driver mrfld_extcon_driver = { 273 .driver = { 274 .name = "mrfld_bcove_pwrsrc", 275 }, 276 .probe = mrfld_extcon_probe, 277 .remove = mrfld_extcon_remove, 278 .id_table = mrfld_extcon_id_table, 279 }; 280 module_platform_driver(mrfld_extcon_driver); 281 282 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); 283 MODULE_DESCRIPTION("extcon driver for Intel Merrifield Basin Cove PMIC"); 284 MODULE_LICENSE("GPL v2"); 285