Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Core driver for TI TPS65090 PMIC family |
| 3 | * |
| 4 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
| 5 | |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/irq.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/mutex.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/i2c.h> |
| 26 | #include <linux/mfd/core.h> |
| 27 | #include <linux/mfd/tps65090.h> |
| 28 | #include <linux/regmap.h> |
| 29 | #include <linux/err.h> |
| 30 | |
| 31 | #define NUM_INT_REG 2 |
| 32 | #define TOTAL_NUM_REG 0x18 |
| 33 | |
| 34 | /* interrupt status registers */ |
| 35 | #define TPS65090_INT_STS 0x0 |
| 36 | #define TPS65090_INT_STS2 0x1 |
| 37 | |
| 38 | /* interrupt mask registers */ |
| 39 | #define TPS65090_INT_MSK 0x2 |
| 40 | #define TPS65090_INT_MSK2 0x3 |
| 41 | |
| 42 | struct tps65090_irq_data { |
| 43 | u8 mask_reg; |
| 44 | u8 mask_pos; |
| 45 | }; |
| 46 | |
| 47 | #define TPS65090_IRQ(_reg, _mask_pos) \ |
| 48 | { \ |
| 49 | .mask_reg = (_reg), \ |
| 50 | .mask_pos = (_mask_pos), \ |
| 51 | } |
| 52 | |
| 53 | static const struct tps65090_irq_data tps65090_irqs[] = { |
| 54 | [0] = TPS65090_IRQ(0, 0), |
| 55 | [1] = TPS65090_IRQ(0, 1), |
| 56 | [2] = TPS65090_IRQ(0, 2), |
| 57 | [3] = TPS65090_IRQ(0, 3), |
| 58 | [4] = TPS65090_IRQ(0, 4), |
| 59 | [5] = TPS65090_IRQ(0, 5), |
| 60 | [6] = TPS65090_IRQ(0, 6), |
| 61 | [7] = TPS65090_IRQ(0, 7), |
| 62 | [8] = TPS65090_IRQ(1, 0), |
| 63 | [9] = TPS65090_IRQ(1, 1), |
| 64 | [10] = TPS65090_IRQ(1, 2), |
| 65 | [11] = TPS65090_IRQ(1, 3), |
| 66 | [12] = TPS65090_IRQ(1, 4), |
| 67 | [13] = TPS65090_IRQ(1, 5), |
| 68 | [14] = TPS65090_IRQ(1, 6), |
| 69 | [15] = TPS65090_IRQ(1, 7), |
| 70 | }; |
| 71 | |
| 72 | static struct mfd_cell tps65090s[] = { |
| 73 | { |
| 74 | .name = "tps65910-pmic", |
| 75 | }, |
| 76 | { |
| 77 | .name = "tps65910-regulator", |
| 78 | }, |
| 79 | }; |
| 80 | |
| 81 | struct tps65090 { |
| 82 | struct mutex lock; |
| 83 | struct device *dev; |
| 84 | struct i2c_client *client; |
| 85 | struct regmap *rmap; |
| 86 | struct irq_chip irq_chip; |
| 87 | struct mutex irq_lock; |
| 88 | int irq_base; |
| 89 | unsigned int id; |
| 90 | }; |
| 91 | |
| 92 | int tps65090_write(struct device *dev, int reg, uint8_t val) |
| 93 | { |
| 94 | struct tps65090 *tps = dev_get_drvdata(dev); |
| 95 | return regmap_write(tps->rmap, reg, val); |
| 96 | } |
| 97 | EXPORT_SYMBOL_GPL(tps65090_write); |
| 98 | |
| 99 | int tps65090_read(struct device *dev, int reg, uint8_t *val) |
| 100 | { |
| 101 | struct tps65090 *tps = dev_get_drvdata(dev); |
| 102 | unsigned int temp_val; |
| 103 | int ret; |
| 104 | ret = regmap_read(tps->rmap, reg, &temp_val); |
| 105 | if (!ret) |
| 106 | *val = temp_val; |
| 107 | return ret; |
| 108 | } |
| 109 | EXPORT_SYMBOL_GPL(tps65090_read); |
| 110 | |
| 111 | int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num) |
| 112 | { |
| 113 | struct tps65090 *tps = dev_get_drvdata(dev); |
| 114 | return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u); |
| 115 | } |
| 116 | EXPORT_SYMBOL_GPL(tps65090_set_bits); |
| 117 | |
| 118 | int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num) |
| 119 | { |
| 120 | struct tps65090 *tps = dev_get_drvdata(dev); |
| 121 | return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u); |
| 122 | } |
| 123 | EXPORT_SYMBOL_GPL(tps65090_clr_bits); |
| 124 | |
| 125 | static void tps65090_irq_lock(struct irq_data *data) |
| 126 | { |
| 127 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data); |
| 128 | |
| 129 | mutex_lock(&tps65090->irq_lock); |
| 130 | } |
| 131 | |
| 132 | static void tps65090_irq_mask(struct irq_data *irq_data) |
| 133 | { |
| 134 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data); |
| 135 | unsigned int __irq = irq_data->hwirq; |
| 136 | const struct tps65090_irq_data *data = &tps65090_irqs[__irq]; |
| 137 | |
| 138 | tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg), |
| 139 | data->mask_pos); |
| 140 | } |
| 141 | |
| 142 | static void tps65090_irq_unmask(struct irq_data *irq_data) |
| 143 | { |
| 144 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data); |
| 145 | unsigned int __irq = irq_data->irq - tps65090->irq_base; |
| 146 | const struct tps65090_irq_data *data = &tps65090_irqs[__irq]; |
| 147 | |
| 148 | tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg), |
| 149 | data->mask_pos); |
| 150 | } |
| 151 | |
| 152 | static void tps65090_irq_sync_unlock(struct irq_data *data) |
| 153 | { |
| 154 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data); |
| 155 | |
| 156 | mutex_unlock(&tps65090->irq_lock); |
| 157 | } |
| 158 | |
| 159 | static irqreturn_t tps65090_irq(int irq, void *data) |
| 160 | { |
| 161 | struct tps65090 *tps65090 = data; |
| 162 | int ret = 0; |
| 163 | u8 status, mask; |
| 164 | unsigned long int acks = 0; |
| 165 | int i; |
| 166 | |
| 167 | for (i = 0; i < NUM_INT_REG; i++) { |
| 168 | ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask); |
| 169 | if (ret < 0) { |
| 170 | dev_err(tps65090->dev, |
| 171 | "failed to read mask reg [addr:%d]\n", |
| 172 | TPS65090_INT_MSK + i); |
| 173 | return IRQ_NONE; |
| 174 | } |
| 175 | ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i, |
| 176 | &status); |
| 177 | if (ret < 0) { |
| 178 | dev_err(tps65090->dev, |
| 179 | "failed to read status reg [addr:%d]\n", |
| 180 | TPS65090_INT_STS + i); |
| 181 | return IRQ_NONE; |
| 182 | } |
| 183 | if (status) { |
| 184 | /* Ack only those interrupts which are not masked */ |
| 185 | status &= (~mask); |
| 186 | ret = tps65090_write(tps65090->dev, |
| 187 | TPS65090_INT_STS + i, status); |
| 188 | if (ret < 0) { |
| 189 | dev_err(tps65090->dev, |
| 190 | "failed to write interrupt status\n"); |
| 191 | return IRQ_NONE; |
| 192 | } |
| 193 | acks |= (status << (i * 8)); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs)) |
| 198 | handle_nested_irq(tps65090->irq_base + i); |
| 199 | return acks ? IRQ_HANDLED : IRQ_NONE; |
| 200 | } |
| 201 | |
| 202 | static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq, |
| 203 | int irq_base) |
| 204 | { |
| 205 | int i, ret; |
| 206 | |
| 207 | if (!irq_base) { |
| 208 | dev_err(tps65090->dev, "IRQ base not set\n"); |
| 209 | return -EINVAL; |
| 210 | } |
| 211 | |
| 212 | mutex_init(&tps65090->irq_lock); |
| 213 | |
| 214 | for (i = 0; i < NUM_INT_REG; i++) |
| 215 | tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF); |
| 216 | |
| 217 | for (i = 0; i < NUM_INT_REG; i++) |
| 218 | tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff); |
| 219 | |
| 220 | tps65090->irq_base = irq_base; |
| 221 | tps65090->irq_chip.name = "tps65090"; |
| 222 | tps65090->irq_chip.irq_mask = tps65090_irq_mask; |
| 223 | tps65090->irq_chip.irq_unmask = tps65090_irq_unmask; |
| 224 | tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock; |
| 225 | tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock; |
| 226 | |
| 227 | for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) { |
| 228 | int __irq = i + tps65090->irq_base; |
| 229 | irq_set_chip_data(__irq, tps65090); |
| 230 | irq_set_chip_and_handler(__irq, &tps65090->irq_chip, |
| 231 | handle_simple_irq); |
| 232 | irq_set_nested_thread(__irq, 1); |
| 233 | #ifdef CONFIG_ARM |
| 234 | set_irq_flags(__irq, IRQF_VALID); |
| 235 | #endif |
| 236 | } |
| 237 | |
| 238 | ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT, |
| 239 | "tps65090", tps65090); |
| 240 | if (!ret) { |
| 241 | device_init_wakeup(tps65090->dev, 1); |
| 242 | enable_irq_wake(irq); |
| 243 | } |
| 244 | |
| 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | static bool is_volatile_reg(struct device *dev, unsigned int reg) |
| 249 | { |
| 250 | if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS)) |
| 251 | return true; |
| 252 | else |
| 253 | return false; |
| 254 | } |
| 255 | |
| 256 | static const struct regmap_config tps65090_regmap_config = { |
| 257 | .reg_bits = 8, |
| 258 | .val_bits = 8, |
| 259 | .max_register = TOTAL_NUM_REG, |
| 260 | .num_reg_defaults_raw = TOTAL_NUM_REG, |
| 261 | .cache_type = REGCACHE_RBTREE, |
| 262 | .volatile_reg = is_volatile_reg, |
| 263 | }; |
| 264 | |
| 265 | static int __devinit tps65090_i2c_probe(struct i2c_client *client, |
| 266 | const struct i2c_device_id *id) |
| 267 | { |
| 268 | struct tps65090_platform_data *pdata = client->dev.platform_data; |
| 269 | struct tps65090 *tps65090; |
| 270 | int ret; |
| 271 | |
| 272 | if (!pdata) { |
| 273 | dev_err(&client->dev, "tps65090 requires platform data\n"); |
| 274 | return -EINVAL; |
| 275 | } |
| 276 | |
| 277 | tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090), |
| 278 | GFP_KERNEL); |
| 279 | if (tps65090 == NULL) |
| 280 | return -ENOMEM; |
| 281 | |
| 282 | tps65090->client = client; |
| 283 | tps65090->dev = &client->dev; |
| 284 | i2c_set_clientdata(client, tps65090); |
| 285 | |
| 286 | mutex_init(&tps65090->lock); |
| 287 | |
| 288 | if (client->irq) { |
| 289 | ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base); |
| 290 | if (ret) { |
| 291 | dev_err(&client->dev, "IRQ init failed with err: %d\n", |
| 292 | ret); |
| 293 | goto err_exit; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | tps65090->rmap = regmap_init_i2c(tps65090->client, |
| 298 | &tps65090_regmap_config); |
| 299 | if (IS_ERR(tps65090->rmap)) { |
Axel Lin | b683a0a | 2012-04-25 09:30:36 +0800 | [diff] [blame^] | 300 | ret = PTR_ERR(tps65090->rmap); |
| 301 | dev_err(&client->dev, "regmap_init failed with err: %d\n", ret); |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 302 | goto err_irq_exit; |
Axel Lin | b683a0a | 2012-04-25 09:30:36 +0800 | [diff] [blame^] | 303 | } |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 304 | |
| 305 | ret = mfd_add_devices(tps65090->dev, -1, tps65090s, |
| 306 | ARRAY_SIZE(tps65090s), NULL, 0); |
| 307 | if (ret) { |
| 308 | dev_err(&client->dev, "add mfd devices failed with err: %d\n", |
| 309 | ret); |
| 310 | goto err_regmap_exit; |
| 311 | } |
| 312 | |
| 313 | return 0; |
| 314 | |
| 315 | err_regmap_exit: |
| 316 | regmap_exit(tps65090->rmap); |
| 317 | |
| 318 | err_irq_exit: |
| 319 | if (client->irq) |
| 320 | free_irq(client->irq, tps65090); |
| 321 | err_exit: |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | static int __devexit tps65090_i2c_remove(struct i2c_client *client) |
| 326 | { |
| 327 | struct tps65090 *tps65090 = i2c_get_clientdata(client); |
| 328 | |
| 329 | mfd_remove_devices(tps65090->dev); |
| 330 | regmap_exit(tps65090->rmap); |
| 331 | if (client->irq) |
| 332 | free_irq(client->irq, tps65090); |
| 333 | |
| 334 | return 0; |
| 335 | } |
| 336 | |
Mark Brown | 1ca5513 | 2012-05-07 10:03:17 +0100 | [diff] [blame] | 337 | #ifdef CONFIG_PM_SLEEP |
Mark Brown | b6c9eee | 2012-05-07 10:03:18 +0100 | [diff] [blame] | 338 | static int tps65090_suspend(struct device *dev) |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 339 | { |
Mark Brown | b6c9eee | 2012-05-07 10:03:18 +0100 | [diff] [blame] | 340 | struct i2c_client *client = to_i2c_client(dev); |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 341 | if (client->irq) |
| 342 | disable_irq(client->irq); |
| 343 | return 0; |
| 344 | } |
| 345 | |
Mark Brown | b6c9eee | 2012-05-07 10:03:18 +0100 | [diff] [blame] | 346 | static int tps65090_resume(struct device *dev) |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 347 | { |
Mark Brown | b6c9eee | 2012-05-07 10:03:18 +0100 | [diff] [blame] | 348 | struct i2c_client *client = to_i2c_client(dev); |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 349 | if (client->irq) |
| 350 | enable_irq(client->irq); |
| 351 | return 0; |
| 352 | } |
| 353 | #endif |
| 354 | |
Mark Brown | b6c9eee | 2012-05-07 10:03:18 +0100 | [diff] [blame] | 355 | static const struct dev_pm_ops tps65090_pm_ops = { |
| 356 | SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume) |
| 357 | }; |
| 358 | |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 359 | static const struct i2c_device_id tps65090_id_table[] = { |
| 360 | { "tps65090", 0 }, |
| 361 | { }, |
| 362 | }; |
| 363 | MODULE_DEVICE_TABLE(i2c, tps65090_id_table); |
| 364 | |
| 365 | static struct i2c_driver tps65090_driver = { |
| 366 | .driver = { |
| 367 | .name = "tps65090", |
| 368 | .owner = THIS_MODULE, |
Mark Brown | b6c9eee | 2012-05-07 10:03:18 +0100 | [diff] [blame] | 369 | .pm = &tps65090_pm_ops, |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 370 | }, |
| 371 | .probe = tps65090_i2c_probe, |
| 372 | .remove = __devexit_p(tps65090_i2c_remove), |
Venu Byravarasu | 3c33be06 | 2012-03-16 11:10:19 +0530 | [diff] [blame] | 373 | .id_table = tps65090_id_table, |
| 374 | }; |
| 375 | |
| 376 | static int __init tps65090_init(void) |
| 377 | { |
| 378 | return i2c_add_driver(&tps65090_driver); |
| 379 | } |
| 380 | subsys_initcall(tps65090_init); |
| 381 | |
| 382 | static void __exit tps65090_exit(void) |
| 383 | { |
| 384 | i2c_del_driver(&tps65090_driver); |
| 385 | } |
| 386 | module_exit(tps65090_exit); |
| 387 | |
| 388 | MODULE_DESCRIPTION("TPS65090 core driver"); |
| 389 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); |
| 390 | MODULE_LICENSE("GPL v2"); |