1 /* 2 * pca9532.c - 16-bit Led dimmer 3 * 4 * Copyright (C) 2008 Riku Voipio <riku.voipio@movial.fi> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 of the License. 9 * 10 * Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf 11 * 12 */ 13 14 #include <linux/module.h> 15 #include <linux/i2c.h> 16 #include <linux/leds.h> 17 #include <linux/input.h> 18 #include <linux/mutex.h> 19 #include <linux/leds-pca9532.h> 20 21 static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END}; 22 I2C_CLIENT_INSMOD_1(pca9532); 23 24 #define PCA9532_REG_PSC(i) (0x2+(i)*2) 25 #define PCA9532_REG_PWM(i) (0x3+(i)*2) 26 #define PCA9532_REG_LS0 0x6 27 #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0) 28 #define LED_NUM(led) (led & 0x3) 29 30 #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) 31 32 struct pca9532_data { 33 struct i2c_client *client; 34 struct pca9532_led leds[16]; 35 struct mutex update_lock; 36 struct input_dev *idev; 37 u8 pwm[2]; 38 u8 psc[2]; 39 }; 40 41 static int pca9532_probe(struct i2c_client *client, 42 const struct i2c_device_id *id); 43 static int pca9532_remove(struct i2c_client *client); 44 45 static const struct i2c_device_id pca9532_id[] = { 46 { "pca9532", 0 }, 47 { } 48 }; 49 50 MODULE_DEVICE_TABLE(i2c, pca9532_id); 51 52 static struct i2c_driver pca9532_driver = { 53 .driver = { 54 .name = "pca9532", 55 }, 56 .probe = pca9532_probe, 57 .remove = pca9532_remove, 58 .id_table = pca9532_id, 59 }; 60 61 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly, 62 * the clever Thecus people are using one pwm to drive the beeper. So, 63 * as a compromise we average one pwm to the values requested by all 64 * leds that are not ON/OFF. 65 * */ 66 static int pca9532_setpwm(struct i2c_client *client, int pwm, int blink, 67 enum led_brightness value) 68 { 69 int a = 0, b = 0, i = 0; 70 struct pca9532_data *data = i2c_get_clientdata(client); 71 for (i = 0; i < 16; i++) { 72 if (data->leds[i].type == PCA9532_TYPE_LED && 73 data->leds[i].state == PCA9532_PWM0+pwm) { 74 a++; 75 b += data->leds[i].ldev.brightness; 76 } 77 } 78 if (a == 0) { 79 dev_err(&client->dev, 80 "fear of division by zero %d/%d, wanted %d\n", 81 b, a, value); 82 return -EINVAL; 83 } 84 b = b/a; 85 if (b > 0xFF) 86 return -EINVAL; 87 mutex_lock(&data->update_lock); 88 data->pwm[pwm] = b; 89 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm), 90 data->pwm[pwm]); 91 data->psc[pwm] = blink; 92 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm), 93 data->psc[pwm]); 94 mutex_unlock(&data->update_lock); 95 return 0; 96 } 97 98 /* Set LED routing */ 99 static void pca9532_setled(struct pca9532_led *led) 100 { 101 struct i2c_client *client = led->client; 102 struct pca9532_data *data = i2c_get_clientdata(client); 103 char reg; 104 105 mutex_lock(&data->update_lock); 106 reg = i2c_smbus_read_byte_data(client, LED_REG(led->id)); 107 /* zero led bits */ 108 reg = reg & ~(0x3<<LED_NUM(led->id)*2); 109 /* set the new value */ 110 reg = reg | (led->state << LED_NUM(led->id)*2); 111 i2c_smbus_write_byte_data(client, LED_REG(led->id), reg); 112 mutex_unlock(&data->update_lock); 113 } 114 115 static void pca9532_set_brightness(struct led_classdev *led_cdev, 116 enum led_brightness value) 117 { 118 int err = 0; 119 struct pca9532_led *led = ldev_to_led(led_cdev); 120 121 if (value == LED_OFF) 122 led->state = PCA9532_OFF; 123 else if (value == LED_FULL) 124 led->state = PCA9532_ON; 125 else { 126 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ 127 err = pca9532_setpwm(led->client, 0, 0, value); 128 if (err) 129 return; /* XXX: led api doesn't allow error code? */ 130 } 131 pca9532_setled(led); 132 } 133 134 static int pca9532_set_blink(struct led_classdev *led_cdev, 135 unsigned long *delay_on, unsigned long *delay_off) 136 { 137 struct pca9532_led *led = ldev_to_led(led_cdev); 138 struct i2c_client *client = led->client; 139 int psc; 140 141 if (*delay_on == 0 && *delay_off == 0) { 142 /* led subsystem ask us for a blink rate */ 143 *delay_on = 1000; 144 *delay_off = 1000; 145 } 146 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) 147 return -EINVAL; 148 149 /* Thecus specific: only use PSC/PWM 0 */ 150 psc = (*delay_on * 152-1)/1000; 151 return pca9532_setpwm(client, 0, psc, led_cdev->brightness); 152 } 153 154 int pca9532_event(struct input_dev *dev, unsigned int type, unsigned int code, 155 int value) 156 { 157 struct pca9532_data *data = input_get_drvdata(dev); 158 159 if (type != EV_SND && (code != SND_BELL || code != SND_TONE)) 160 return -1; 161 162 /* XXX: allow different kind of beeps with psc/pwm modifications */ 163 if (value > 1 && value < 32767) 164 data->pwm[1] = 127; 165 else 166 data->pwm[1] = 0; 167 168 dev_info(&dev->dev, "setting beep to %d \n", data->pwm[1]); 169 mutex_lock(&data->update_lock); 170 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1), 171 data->pwm[1]); 172 mutex_unlock(&data->update_lock); 173 174 return 0; 175 } 176 177 static int pca9532_configure(struct i2c_client *client, 178 struct pca9532_data *data, struct pca9532_platform_data *pdata) 179 { 180 int i, err = 0; 181 182 for (i = 0; i < 2; i++) { 183 data->pwm[i] = pdata->pwm[i]; 184 data->psc[i] = pdata->psc[i]; 185 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i), 186 data->pwm[i]); 187 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i), 188 data->psc[i]); 189 } 190 191 for (i = 0; i < 16; i++) { 192 struct pca9532_led *led = &data->leds[i]; 193 struct pca9532_led *pled = &pdata->leds[i]; 194 led->client = client; 195 led->id = i; 196 led->type = pled->type; 197 switch (led->type) { 198 case PCA9532_TYPE_NONE: 199 break; 200 case PCA9532_TYPE_LED: 201 led->state = pled->state; 202 led->name = pled->name; 203 led->ldev.name = led->name; 204 led->ldev.brightness = LED_OFF; 205 led->ldev.brightness_set = pca9532_set_brightness; 206 led->ldev.blink_set = pca9532_set_blink; 207 if (led_classdev_register(&client->dev, 208 &led->ldev) < 0) { 209 dev_err(&client->dev, 210 "couldn't register LED %s\n", 211 led->name); 212 goto exit; 213 } 214 pca9532_setled(led); 215 break; 216 case PCA9532_TYPE_N2100_BEEP: 217 BUG_ON(data->idev); 218 led->state = PCA9532_PWM1; 219 pca9532_setled(led); 220 data->idev = input_allocate_device(); 221 if (data->idev == NULL) { 222 err = -ENOMEM; 223 goto exit; 224 } 225 data->idev->name = pled->name; 226 data->idev->phys = "i2c/pca9532"; 227 data->idev->id.bustype = BUS_HOST; 228 data->idev->id.vendor = 0x001f; 229 data->idev->id.product = 0x0001; 230 data->idev->id.version = 0x0100; 231 data->idev->evbit[0] = BIT_MASK(EV_SND); 232 data->idev->sndbit[0] = BIT_MASK(SND_BELL) | 233 BIT_MASK(SND_TONE); 234 data->idev->event = pca9532_event; 235 input_set_drvdata(data->idev, data); 236 err = input_register_device(data->idev); 237 if (err) { 238 input_free_device(data->idev); 239 data->idev = NULL; 240 goto exit; 241 } 242 break; 243 } 244 } 245 return 0; 246 247 exit: 248 if (i > 0) 249 for (i = i - 1; i >= 0; i--) 250 switch (data->leds[i].type) { 251 case PCA9532_TYPE_NONE: 252 break; 253 case PCA9532_TYPE_LED: 254 led_classdev_unregister(&data->leds[i].ldev); 255 break; 256 case PCA9532_TYPE_N2100_BEEP: 257 if (data->idev != NULL) { 258 input_unregister_device(data->idev); 259 input_free_device(data->idev); 260 data->idev = NULL; 261 } 262 break; 263 } 264 265 return err; 266 267 } 268 269 static int pca9532_probe(struct i2c_client *client, 270 const struct i2c_device_id *id) 271 { 272 struct pca9532_data *data = i2c_get_clientdata(client); 273 struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data; 274 275 if (!i2c_check_functionality(client->adapter, 276 I2C_FUNC_SMBUS_BYTE_DATA)) 277 return -EIO; 278 279 data = kzalloc(sizeof(struct pca9532_data), GFP_KERNEL); 280 if (!data) 281 return -ENOMEM; 282 283 dev_info(&client->dev, "setting platform data\n"); 284 i2c_set_clientdata(client, data); 285 data->client = client; 286 mutex_init(&data->update_lock); 287 288 if (pca9532_pdata == NULL) 289 return -EIO; 290 291 pca9532_configure(client, data, pca9532_pdata); 292 return 0; 293 294 } 295 296 static int pca9532_remove(struct i2c_client *client) 297 { 298 struct pca9532_data *data = i2c_get_clientdata(client); 299 int i; 300 for (i = 0; i < 16; i++) 301 switch (data->leds[i].type) { 302 case PCA9532_TYPE_NONE: 303 break; 304 case PCA9532_TYPE_LED: 305 led_classdev_unregister(&data->leds[i].ldev); 306 break; 307 case PCA9532_TYPE_N2100_BEEP: 308 if (data->idev != NULL) { 309 input_unregister_device(data->idev); 310 input_free_device(data->idev); 311 data->idev = NULL; 312 } 313 break; 314 } 315 316 kfree(data); 317 i2c_set_clientdata(client, NULL); 318 return 0; 319 } 320 321 static int __init pca9532_init(void) 322 { 323 return i2c_add_driver(&pca9532_driver); 324 } 325 326 static void __exit pca9532_exit(void) 327 { 328 i2c_del_driver(&pca9532_driver); 329 } 330 331 MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>"); 332 MODULE_LICENSE("GPL"); 333 MODULE_DESCRIPTION("PCA 9532 LED dimmer"); 334 335 module_init(pca9532_init); 336 module_exit(pca9532_exit); 337 338