drivers/hwmon/npcm750-pwm-fan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2014-2018 Nuvoton Technology corporation.
   3
   4 #include <linux/clk.h>
   5 #include <linux/device.h>
   6 #include <linux/hwmon.h>
   7 #include <linux/hwmon-sysfs.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/of_address.h>
  12 #include <linux/of_irq.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/sysfs.h>
  16 #include <linux/thermal.h>
  17
  18 /* NPCM7XX PWM registers */
  19 #define NPCM7XX_PWM_REG_BASE(base, n)    ((base) + ((n) * 0x1000L))
  20
  21 #define NPCM7XX_PWM_REG_PR(base, n)     (NPCM7XX_PWM_REG_BASE(base, n) + 0x00)
  22 #define NPCM7XX_PWM_REG_CSR(base, n)    (NPCM7XX_PWM_REG_BASE(base, n) + 0x04)
  23 #define NPCM7XX_PWM_REG_CR(base, n)     (NPCM7XX_PWM_REG_BASE(base, n) + 0x08)
  24 #define NPCM7XX_PWM_REG_CNRx(base, n, ch) \
  25                         (NPCM7XX_PWM_REG_BASE(base, n) + 0x0C + (12 * (ch)))
  26 #define NPCM7XX_PWM_REG_CMRx(base, n, ch) \
  27                         (NPCM7XX_PWM_REG_BASE(base, n) + 0x10 + (12 * (ch)))
  28 #define NPCM7XX_PWM_REG_PDRx(base, n, ch) \
  29                         (NPCM7XX_PWM_REG_BASE(base, n) + 0x14 + (12 * (ch)))
  30 #define NPCM7XX_PWM_REG_PIER(base, n)   (NPCM7XX_PWM_REG_BASE(base, n) + 0x3C)
  31 #define NPCM7XX_PWM_REG_PIIR(base, n)   (NPCM7XX_PWM_REG_BASE(base, n) + 0x40)
  32
  33 #define NPCM7XX_PWM_CTRL_CH0_MODE_BIT           BIT(3)
  34 #define NPCM7XX_PWM_CTRL_CH1_MODE_BIT           BIT(11)
  35 #define NPCM7XX_PWM_CTRL_CH2_MODE_BIT           BIT(15)
  36 #define NPCM7XX_PWM_CTRL_CH3_MODE_BIT           BIT(19)
  37
  38 #define NPCM7XX_PWM_CTRL_CH0_INV_BIT            BIT(2)
  39 #define NPCM7XX_PWM_CTRL_CH1_INV_BIT            BIT(10)
  40 #define NPCM7XX_PWM_CTRL_CH2_INV_BIT            BIT(14)
  41 #define NPCM7XX_PWM_CTRL_CH3_INV_BIT            BIT(18)
  42
  43 #define NPCM7XX_PWM_CTRL_CH0_EN_BIT             BIT(0)
  44 #define NPCM7XX_PWM_CTRL_CH1_EN_BIT             BIT(8)
  45 #define NPCM7XX_PWM_CTRL_CH2_EN_BIT             BIT(12)
  46 #define NPCM7XX_PWM_CTRL_CH3_EN_BIT             BIT(16)
  47
  48 /* Define the maximum PWM channel number */
  49 #define NPCM7XX_PWM_MAX_CHN_NUM                 8
  50 #define NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE     4
  51 #define NPCM7XX_PWM_MAX_MODULES                 2
  52
  53 /* Define the Counter Register, value = 100 for match 100% */
  54 #define NPCM7XX_PWM_COUNTER_DEFAULT_NUM         255
  55 #define NPCM7XX_PWM_CMR_DEFAULT_NUM             255
  56 #define NPCM7XX_PWM_CMR_MAX                     255
  57
  58 /* default all PWM channels PRESCALE2 = 1 */
  59 #define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH0       0x4
  60 #define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH1       0x40
  61 #define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH2       0x400
  62 #define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH3       0x4000
  63
  64 #define PWM_OUTPUT_FREQ_25KHZ                   25000
  65 #define PWN_CNT_DEFAULT                         256
  66 #define MIN_PRESCALE1                           2
  67 #define NPCM7XX_PWM_PRESCALE_SHIFT_CH01         8
  68
  69 #define NPCM7XX_PWM_PRESCALE2_DEFAULT   (NPCM7XX_PWM_PRESCALE2_DEFAULT_CH0 | \
  70                                         NPCM7XX_PWM_PRESCALE2_DEFAULT_CH1 | \
  71                                         NPCM7XX_PWM_PRESCALE2_DEFAULT_CH2 | \
  72                                         NPCM7XX_PWM_PRESCALE2_DEFAULT_CH3)
  73
  74 #define NPCM7XX_PWM_CTRL_MODE_DEFAULT   (NPCM7XX_PWM_CTRL_CH0_MODE_BIT | \
  75                                         NPCM7XX_PWM_CTRL_CH1_MODE_BIT | \
  76                                         NPCM7XX_PWM_CTRL_CH2_MODE_BIT | \
  77                                         NPCM7XX_PWM_CTRL_CH3_MODE_BIT)
  78
  79 /* NPCM7XX FAN Tacho registers */
  80 #define NPCM7XX_FAN_REG_BASE(base, n)   ((base) + ((n) * 0x1000L))
  81
  82 #define NPCM7XX_FAN_REG_TCNT1(base, n)    (NPCM7XX_FAN_REG_BASE(base, n) + 0x00)
  83 #define NPCM7XX_FAN_REG_TCRA(base, n)     (NPCM7XX_FAN_REG_BASE(base, n) + 0x02)
  84 #define NPCM7XX_FAN_REG_TCRB(base, n)     (NPCM7XX_FAN_REG_BASE(base, n) + 0x04)
  85 #define NPCM7XX_FAN_REG_TCNT2(base, n)    (NPCM7XX_FAN_REG_BASE(base, n) + 0x06)
  86 #define NPCM7XX_FAN_REG_TPRSC(base, n)    (NPCM7XX_FAN_REG_BASE(base, n) + 0x08)
  87 #define NPCM7XX_FAN_REG_TCKC(base, n)     (NPCM7XX_FAN_REG_BASE(base, n) + 0x0A)
  88 #define NPCM7XX_FAN_REG_TMCTRL(base, n)   (NPCM7XX_FAN_REG_BASE(base, n) + 0x0C)
  89 #define NPCM7XX_FAN_REG_TICTRL(base, n)   (NPCM7XX_FAN_REG_BASE(base, n) + 0x0E)
  90 #define NPCM7XX_FAN_REG_TICLR(base, n)    (NPCM7XX_FAN_REG_BASE(base, n) + 0x10)
  91 #define NPCM7XX_FAN_REG_TIEN(base, n)     (NPCM7XX_FAN_REG_BASE(base, n) + 0x12)
  92 #define NPCM7XX_FAN_REG_TCPA(base, n)     (NPCM7XX_FAN_REG_BASE(base, n) + 0x14)
  93 #define NPCM7XX_FAN_REG_TCPB(base, n)     (NPCM7XX_FAN_REG_BASE(base, n) + 0x16)
  94 #define NPCM7XX_FAN_REG_TCPCFG(base, n)   (NPCM7XX_FAN_REG_BASE(base, n) + 0x18)
  95 #define NPCM7XX_FAN_REG_TINASEL(base, n)  (NPCM7XX_FAN_REG_BASE(base, n) + 0x1A)
  96 #define NPCM7XX_FAN_REG_TINBSEL(base, n)  (NPCM7XX_FAN_REG_BASE(base, n) + 0x1C)
  97
  98 #define NPCM7XX_FAN_TCKC_CLKX_NONE      0
  99 #define NPCM7XX_FAN_TCKC_CLK1_APB       BIT(0)
 100 #define NPCM7XX_FAN_TCKC_CLK2_APB       BIT(3)
 101
 102 #define NPCM7XX_FAN_TMCTRL_TBEN         BIT(6)
 103 #define NPCM7XX_FAN_TMCTRL_TAEN         BIT(5)
 104 #define NPCM7XX_FAN_TMCTRL_TBEDG        BIT(4)
 105 #define NPCM7XX_FAN_TMCTRL_TAEDG        BIT(3)
 106 #define NPCM7XX_FAN_TMCTRL_MODE_5       BIT(2)
 107
 108 #define NPCM7XX_FAN_TICLR_CLEAR_ALL     GENMASK(5, 0)
 109 #define NPCM7XX_FAN_TICLR_TFCLR         BIT(5)
 110 #define NPCM7XX_FAN_TICLR_TECLR         BIT(4)
 111 #define NPCM7XX_FAN_TICLR_TDCLR         BIT(3)
 112 #define NPCM7XX_FAN_TICLR_TCCLR         BIT(2)
 113 #define NPCM7XX_FAN_TICLR_TBCLR         BIT(1)
 114 #define NPCM7XX_FAN_TICLR_TACLR         BIT(0)
 115
 116 #define NPCM7XX_FAN_TIEN_ENABLE_ALL     GENMASK(5, 0)
 117 #define NPCM7XX_FAN_TIEN_TFIEN          BIT(5)
 118 #define NPCM7XX_FAN_TIEN_TEIEN          BIT(4)
 119 #define NPCM7XX_FAN_TIEN_TDIEN          BIT(3)
 120 #define NPCM7XX_FAN_TIEN_TCIEN          BIT(2)
 121 #define NPCM7XX_FAN_TIEN_TBIEN          BIT(1)
 122 #define NPCM7XX_FAN_TIEN_TAIEN          BIT(0)
 123
 124 #define NPCM7XX_FAN_TICTRL_TFPND        BIT(5)
 125 #define NPCM7XX_FAN_TICTRL_TEPND        BIT(4)
 126 #define NPCM7XX_FAN_TICTRL_TDPND        BIT(3)
 127 #define NPCM7XX_FAN_TICTRL_TCPND        BIT(2)
 128 #define NPCM7XX_FAN_TICTRL_TBPND        BIT(1)
 129 #define NPCM7XX_FAN_TICTRL_TAPND        BIT(0)
 130
 131 #define NPCM7XX_FAN_TCPCFG_HIBEN        BIT(7)
 132 #define NPCM7XX_FAN_TCPCFG_EQBEN        BIT(6)
 133 #define NPCM7XX_FAN_TCPCFG_LOBEN        BIT(5)
 134 #define NPCM7XX_FAN_TCPCFG_CPBSEL       BIT(4)
 135 #define NPCM7XX_FAN_TCPCFG_HIAEN        BIT(3)
 136 #define NPCM7XX_FAN_TCPCFG_EQAEN        BIT(2)
 137 #define NPCM7XX_FAN_TCPCFG_LOAEN        BIT(1)
 138 #define NPCM7XX_FAN_TCPCFG_CPASEL       BIT(0)
 139
 140 /* FAN General Definition */
 141 /* Define the maximum FAN channel number */
 142 #define NPCM7XX_FAN_MAX_MODULE                  8
 143 #define NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE     2
 144 #define NPCM7XX_FAN_MAX_CHN_NUM                 16
 145
 146 /*
 147  * Get Fan Tach Timeout (base on clock 214843.75Hz, 1 cnt = 4.654us)
 148  * Timeout 94ms ~= 0x5000
 149  * (The minimum FAN speed could to support ~640RPM/pulse 1,
 150  * 320RPM/pulse 2, ...-- 10.6Hz)
 151  */
 152 #define NPCM7XX_FAN_TIMEOUT     0x5000
 153 #define NPCM7XX_FAN_TCNT        0xFFFF
 154 #define NPCM7XX_FAN_TCPA        (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
 155 #define NPCM7XX_FAN_TCPB        (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
 156
 157 #define NPCM7XX_FAN_POLL_TIMER_200MS                    200
 158 #define NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION        2
 159 #define NPCM7XX_FAN_TINASEL_FANIN_DEFAULT               0
 160 #define NPCM7XX_FAN_CLK_PRESCALE                        255
 161
 162 #define NPCM7XX_FAN_CMPA                                0
 163 #define NPCM7XX_FAN_CMPB                                1
 164
 165 /* Obtain the fan number */
 166 #define NPCM7XX_FAN_INPUT(fan, cmp)             (((fan) << 1) + (cmp))
 167
 168 /* fan sample status */
 169 #define FAN_DISABLE                             0xFF
 170 #define FAN_INIT                                0x00
 171 #define FAN_PREPARE_TO_GET_FIRST_CAPTURE        0x01
 172 #define FAN_ENOUGH_SAMPLE                       0x02
 173
 174 struct npcm7xx_fan_dev {
 175         u8 fan_st_flg;
 176         u8 fan_pls_per_rev;
 177         u16 fan_cnt;
 178         u32 fan_cnt_tmp;
 179 };
 180
 181 struct npcm7xx_cooling_device {
 182         char name[THERMAL_NAME_LENGTH];
 183         struct npcm7xx_pwm_fan_data *data;
 184         struct thermal_cooling_device *tcdev;
 185         int pwm_port;
 186         u8 *cooling_levels;
 187         u8 max_state;
 188         u8 cur_state;
 189 };
 190
 191 struct npcm7xx_pwm_fan_data {
 192         void __iomem *pwm_base;
 193         void __iomem *fan_base;
 194         unsigned long pwm_clk_freq;
 195         unsigned long fan_clk_freq;
 196         struct clk *pwm_clk;
 197         struct clk *fan_clk;
 198         struct mutex pwm_lock[NPCM7XX_PWM_MAX_MODULES];
 199         spinlock_t fan_lock[NPCM7XX_FAN_MAX_MODULE];
 200         int fan_irq[NPCM7XX_FAN_MAX_MODULE];
 201         bool pwm_present[NPCM7XX_PWM_MAX_CHN_NUM];
 202         bool fan_present[NPCM7XX_FAN_MAX_CHN_NUM];
 203         u32 input_clk_freq;
 204         struct timer_list fan_timer;
 205         struct npcm7xx_fan_dev fan_dev[NPCM7XX_FAN_MAX_CHN_NUM];
 206         struct npcm7xx_cooling_device *cdev[NPCM7XX_PWM_MAX_CHN_NUM];
 207         u8 fan_select;
 208 };
 209
 210 static int npcm7xx_pwm_config_set(struct npcm7xx_pwm_fan_data *data,
 211                                   int channel, u16 val)
 212 {
 213         u32 pwm_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
 214         u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
 215         u32 tmp_buf, ctrl_en_bit, env_bit;
 216
 217         /*
 218          * Config PWM Comparator register for setting duty cycle
 219          */
 220         mutex_lock(&data->pwm_lock[module]);
 221
 222         /* write new CMR value  */
 223         iowrite32(val, NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pwm_ch));
 224         tmp_buf = ioread32(NPCM7XX_PWM_REG_CR(data->pwm_base, module));
 225
 226         switch (pwm_ch) {
 227         case 0:
 228                 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH0_EN_BIT;
 229                 env_bit = NPCM7XX_PWM_CTRL_CH0_INV_BIT;
 230                 break;
 231         case 1:
 232                 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH1_EN_BIT;
 233                 env_bit = NPCM7XX_PWM_CTRL_CH1_INV_BIT;
 234                 break;
 235         case 2:
 236                 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH2_EN_BIT;
 237                 env_bit = NPCM7XX_PWM_CTRL_CH2_INV_BIT;
 238                 break;
 239         case 3:
 240                 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH3_EN_BIT;
 241                 env_bit = NPCM7XX_PWM_CTRL_CH3_INV_BIT;
 242                 break;
 243         default:
 244                 mutex_unlock(&data->pwm_lock[module]);
 245                 return -ENODEV;
 246         }
 247
 248         if (val == 0) {
 249                 /* Disable PWM */
 250                 tmp_buf &= ~ctrl_en_bit;
 251                 tmp_buf |= env_bit;
 252         } else {
 253                 /* Enable PWM */
 254                 tmp_buf |= ctrl_en_bit;
 255                 tmp_buf &= ~env_bit;
 256         }
 257
 258         iowrite32(tmp_buf, NPCM7XX_PWM_REG_CR(data->pwm_base, module));
 259         mutex_unlock(&data->pwm_lock[module]);
 260
 261         return 0;
 262 }
 263
 264 static inline void npcm7xx_fan_start_capture(struct npcm7xx_pwm_fan_data *data,
 265                                              u8 fan, u8 cmp)
 266 {
 267         u8 fan_id;
 268         u8 reg_mode;
 269         u8 reg_int;
 270         unsigned long flags;
 271
 272         fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
 273
 274         /* to check whether any fan tach is enable */
 275         if (data->fan_dev[fan_id].fan_st_flg != FAN_DISABLE) {
 276                 /* reset status */
 277                 spin_lock_irqsave(&data->fan_lock[fan], flags);
 278
 279                 data->fan_dev[fan_id].fan_st_flg = FAN_INIT;
 280                 reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 281
 282                 /*
 283                  * the interrupt enable bits do not need to be cleared before
 284                  * it sets, the interrupt enable bits are cleared only on reset.
 285                  * the clock unit control register is behaving in the same
 286                  * manner that the interrupt enable register behave.
 287                  */
 288                 if (cmp == NPCM7XX_FAN_CMPA) {
 289                         /* enable interrupt */
 290                         iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TAIEN |
 291                                             NPCM7XX_FAN_TIEN_TEIEN),
 292                                  NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 293
 294                         reg_mode = NPCM7XX_FAN_TCKC_CLK1_APB
 295                                 | ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
 296                                                                fan));
 297
 298                         /* start to Capture */
 299                         iowrite8(reg_mode, NPCM7XX_FAN_REG_TCKC(data->fan_base,
 300                                                                 fan));
 301                 } else {
 302                         /* enable interrupt */
 303                         iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TBIEN |
 304                                             NPCM7XX_FAN_TIEN_TFIEN),
 305                                  NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 306
 307                         reg_mode =
 308                                 NPCM7XX_FAN_TCKC_CLK2_APB
 309                                 | ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
 310                                                                fan));
 311
 312                         /* start to Capture */
 313                         iowrite8(reg_mode,
 314                                  NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
 315                 }
 316
 317                 spin_unlock_irqrestore(&data->fan_lock[fan], flags);
 318         }
 319 }
 320
 321 /*
 322  * Enable a background timer to poll fan tach value, (200ms * 4)
 323  * to polling all fan
 324  */
 325 static void npcm7xx_fan_polling(struct timer_list *t)
 326 {
 327         struct npcm7xx_pwm_fan_data *data;
 328         int i;
 329
 330         data = from_timer(data, t, fan_timer);
 331
 332         /*
 333          * Polling two module per one round,
 334          * FAN01 & FAN89 / FAN23 & FAN1011 / FAN45 & FAN1213 / FAN67 & FAN1415
 335          */
 336         for (i = data->fan_select; i < NPCM7XX_FAN_MAX_MODULE;
 337               i = i + 4) {
 338                 /* clear the flag and reset the counter (TCNT) */
 339                 iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
 340                          NPCM7XX_FAN_REG_TICLR(data->fan_base, i));
 341
 342                 if (data->fan_present[i * 2]) {
 343                         iowrite16(NPCM7XX_FAN_TCNT,
 344                                   NPCM7XX_FAN_REG_TCNT1(data->fan_base, i));
 345                         npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPA);
 346                 }
 347                 if (data->fan_present[(i * 2) + 1]) {
 348                         iowrite16(NPCM7XX_FAN_TCNT,
 349                                   NPCM7XX_FAN_REG_TCNT2(data->fan_base, i));
 350                         npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPB);
 351                 }
 352         }
 353
 354         data->fan_select++;
 355         data->fan_select &= 0x3;
 356
 357         /* reset the timer interval */
 358         data->fan_timer.expires = jiffies +
 359                 msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
 360         add_timer(&data->fan_timer);
 361 }
 362
 363 static inline void npcm7xx_fan_compute(struct npcm7xx_pwm_fan_data *data,
 364                                        u8 fan, u8 cmp, u8 fan_id, u8 flag_int,
 365                                        u8 flag_mode, u8 flag_clear)
 366 {
 367         u8  reg_int;
 368         u8  reg_mode;
 369         u16 fan_cap;
 370
 371         if (cmp == NPCM7XX_FAN_CMPA)
 372                 fan_cap = ioread16(NPCM7XX_FAN_REG_TCRA(data->fan_base, fan));
 373         else
 374                 fan_cap = ioread16(NPCM7XX_FAN_REG_TCRB(data->fan_base, fan));
 375
 376         /* clear capature flag, H/W will auto reset the NPCM7XX_FAN_TCNTx */
 377         iowrite8(flag_clear, NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
 378
 379         if (data->fan_dev[fan_id].fan_st_flg == FAN_INIT) {
 380                 /* First capture, drop it */
 381                 data->fan_dev[fan_id].fan_st_flg =
 382                         FAN_PREPARE_TO_GET_FIRST_CAPTURE;
 383
 384                 /* reset counter */
 385                 data->fan_dev[fan_id].fan_cnt_tmp = 0;
 386         } else if (data->fan_dev[fan_id].fan_st_flg < FAN_ENOUGH_SAMPLE) {
 387                 /*
 388                  * collect the enough sample,
 389                  * (ex: 2 pulse fan need to get 2 sample)
 390                  */
 391                 data->fan_dev[fan_id].fan_cnt_tmp +=
 392                         (NPCM7XX_FAN_TCNT - fan_cap);
 393
 394                 data->fan_dev[fan_id].fan_st_flg++;
 395         } else {
 396                 /* get enough sample or fan disable */
 397                 if (data->fan_dev[fan_id].fan_st_flg == FAN_ENOUGH_SAMPLE) {
 398                         data->fan_dev[fan_id].fan_cnt_tmp +=
 399                                 (NPCM7XX_FAN_TCNT - fan_cap);
 400
 401                         /* compute finial average cnt per pulse */
 402                         data->fan_dev[fan_id].fan_cnt =
 403                                 data->fan_dev[fan_id].fan_cnt_tmp /
 404                                 FAN_ENOUGH_SAMPLE;
 405
 406                         data->fan_dev[fan_id].fan_st_flg = FAN_INIT;
 407                 }
 408
 409                 reg_int =  ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 410
 411                 /* disable interrupt */
 412                 iowrite8((reg_int & ~flag_int),
 413                          NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 414                 reg_mode =  ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
 415
 416                 /* stop capturing */
 417                 iowrite8((reg_mode & ~flag_mode),
 418                          NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
 419         }
 420 }
 421
 422 static inline void npcm7xx_check_cmp(struct npcm7xx_pwm_fan_data *data,
 423                                      u8 fan, u8 cmp, u8 flag)
 424 {
 425         u8 reg_int;
 426         u8 reg_mode;
 427         u8 flag_timeout;
 428         u8 flag_cap;
 429         u8 flag_clear;
 430         u8 flag_int;
 431         u8 flag_mode;
 432         u8 fan_id;
 433
 434         fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
 435
 436         if (cmp == NPCM7XX_FAN_CMPA) {
 437                 flag_cap = NPCM7XX_FAN_TICTRL_TAPND;
 438                 flag_timeout = NPCM7XX_FAN_TICTRL_TEPND;
 439                 flag_int = NPCM7XX_FAN_TIEN_TAIEN | NPCM7XX_FAN_TIEN_TEIEN;
 440                 flag_mode = NPCM7XX_FAN_TCKC_CLK1_APB;
 441                 flag_clear = NPCM7XX_FAN_TICLR_TACLR | NPCM7XX_FAN_TICLR_TECLR;
 442         } else {
 443                 flag_cap = NPCM7XX_FAN_TICTRL_TBPND;
 444                 flag_timeout = NPCM7XX_FAN_TICTRL_TFPND;
 445                 flag_int = NPCM7XX_FAN_TIEN_TBIEN | NPCM7XX_FAN_TIEN_TFIEN;
 446                 flag_mode = NPCM7XX_FAN_TCKC_CLK2_APB;
 447                 flag_clear = NPCM7XX_FAN_TICLR_TBCLR | NPCM7XX_FAN_TICLR_TFCLR;
 448         }
 449
 450         if (flag & flag_timeout) {
 451                 reg_int =  ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 452
 453                 /* disable interrupt */
 454                 iowrite8((reg_int & ~flag_int),
 455                          NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
 456
 457                 /* clear interrupt flag */
 458                 iowrite8(flag_clear,
 459                          NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
 460
 461                 reg_mode =  ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
 462
 463                 /* stop capturing */
 464                 iowrite8((reg_mode & ~flag_mode),
 465                          NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
 466
 467                 /*
 468                  *  If timeout occurs (NPCM7XX_FAN_TIMEOUT), the fan doesn't
 469                  *  connect or speed is lower than 10.6Hz (320RPM/pulse2).
 470                  *  In these situation, the RPM output should be zero.
 471                  */
 472                 data->fan_dev[fan_id].fan_cnt = 0;
 473         } else {
 474             /* input capture is occurred */
 475                 if (flag & flag_cap)
 476                         npcm7xx_fan_compute(data, fan, cmp, fan_id, flag_int,
 477                                             flag_mode, flag_clear);
 478         }
 479 }
 480
 481 static irqreturn_t npcm7xx_fan_isr(int irq, void *dev_id)
 482 {
 483         struct npcm7xx_pwm_fan_data *data = dev_id;
 484         unsigned long flags;
 485         int module;
 486         u8 flag;
 487
 488         module = irq - data->fan_irq[0];
 489         spin_lock_irqsave(&data->fan_lock[module], flags);
 490
 491         flag = ioread8(NPCM7XX_FAN_REG_TICTRL(data->fan_base, module));
 492         if (flag > 0) {
 493                 npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPA, flag);
 494                 npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPB, flag);
 495                 spin_unlock_irqrestore(&data->fan_lock[module], flags);
 496                 return IRQ_HANDLED;
 497         }
 498
 499         spin_unlock_irqrestore(&data->fan_lock[module], flags);
 500
 501         return IRQ_NONE;
 502 }
 503
 504 static int npcm7xx_read_pwm(struct device *dev, u32 attr, int channel,
 505                             long *val)
 506 {
 507         struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
 508         u32 pmw_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
 509         u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
 510
 511         switch (attr) {
 512         case hwmon_pwm_input:
 513                 *val = ioread32
 514                         (NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pmw_ch));
 515                 return 0;
 516         default:
 517                 return -EOPNOTSUPP;
 518         }
 519 }
 520
 521 static int npcm7xx_write_pwm(struct device *dev, u32 attr, int channel,
 522                              long val)
 523 {
 524         struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
 525         int err;
 526
 527         switch (attr) {
 528         case hwmon_pwm_input:
 529                 if (val < 0 || val > NPCM7XX_PWM_CMR_MAX)
 530                         return -EINVAL;
 531                 err = npcm7xx_pwm_config_set(data, channel, (u16)val);
 532                 break;
 533         default:
 534                 err = -EOPNOTSUPP;
 535                 break;
 536         }
 537
 538         return err;
 539 }
 540
 541 static umode_t npcm7xx_pwm_is_visible(const void *_data, u32 attr, int channel)
 542 {
 543         const struct npcm7xx_pwm_fan_data *data = _data;
 544
 545         if (!data->pwm_present[channel])
 546                 return 0;
 547
 548         switch (attr) {
 549         case hwmon_pwm_input:
 550                 return 0644;
 551         default:
 552                 return 0;
 553         }
 554 }
 555
 556 static int npcm7xx_read_fan(struct device *dev, u32 attr, int channel,
 557                             long *val)
 558 {
 559         struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
 560
 561         switch (attr) {
 562         case hwmon_fan_input:
 563                 *val = 0;
 564                 if (data->fan_dev[channel].fan_cnt <= 0)
 565                         return data->fan_dev[channel].fan_cnt;
 566
 567                 /* Convert the raw reading to RPM */
 568                 if (data->fan_dev[channel].fan_cnt > 0 &&
 569                     data->fan_dev[channel].fan_pls_per_rev > 0)
 570                         *val = ((data->input_clk_freq * 60) /
 571                                 (data->fan_dev[channel].fan_cnt *
 572                                  data->fan_dev[channel].fan_pls_per_rev));
 573                 return 0;
 574         default:
 575                 return -EOPNOTSUPP;
 576         }
 577 }
 578
 579 static umode_t npcm7xx_fan_is_visible(const void *_data, u32 attr, int channel)
 580 {
 581         const struct npcm7xx_pwm_fan_data *data = _data;
 582
 583         if (!data->fan_present[channel])
 584                 return 0;
 585
 586         switch (attr) {
 587         case hwmon_fan_input:
 588                 return 0444;
 589         default:
 590                 return 0;
 591         }
 592 }
 593
 594 static int npcm7xx_read(struct device *dev, enum hwmon_sensor_types type,
 595                         u32 attr, int channel, long *val)
 596 {
 597         switch (type) {
 598         case hwmon_pwm:
 599                 return npcm7xx_read_pwm(dev, attr, channel, val);
 600         case hwmon_fan:
 601                 return npcm7xx_read_fan(dev, attr, channel, val);
 602         default:
 603                 return -EOPNOTSUPP;
 604         }
 605 }
 606
 607 static int npcm7xx_write(struct device *dev, enum hwmon_sensor_types type,
 608                          u32 attr, int channel, long val)
 609 {
 610         switch (type) {
 611         case hwmon_pwm:
 612                 return npcm7xx_write_pwm(dev, attr, channel, val);
 613         default:
 614                 return -EOPNOTSUPP;
 615         }
 616 }
 617
 618 static umode_t npcm7xx_is_visible(const void *data,
 619                                   enum hwmon_sensor_types type,
 620                                   u32 attr, int channel)
 621 {
 622         switch (type) {
 623         case hwmon_pwm:
 624                 return npcm7xx_pwm_is_visible(data, attr, channel);
 625         case hwmon_fan:
 626                 return npcm7xx_fan_is_visible(data, attr, channel);
 627         default:
 628                 return 0;
 629         }
 630 }
 631
 632 static const struct hwmon_channel_info * const npcm7xx_info[] = {
 633         HWMON_CHANNEL_INFO(pwm,
 634                            HWMON_PWM_INPUT,
 635                            HWMON_PWM_INPUT,
 636                            HWMON_PWM_INPUT,
 637                            HWMON_PWM_INPUT,
 638                            HWMON_PWM_INPUT,
 639                            HWMON_PWM_INPUT,
 640                            HWMON_PWM_INPUT,
 641                            HWMON_PWM_INPUT),
 642         HWMON_CHANNEL_INFO(fan,
 643                            HWMON_F_INPUT,
 644                            HWMON_F_INPUT,
 645                            HWMON_F_INPUT,
 646                            HWMON_F_INPUT,
 647                            HWMON_F_INPUT,
 648                            HWMON_F_INPUT,
 649                            HWMON_F_INPUT,
 650                            HWMON_F_INPUT,
 651                            HWMON_F_INPUT,
 652                            HWMON_F_INPUT,
 653                            HWMON_F_INPUT,
 654                            HWMON_F_INPUT,
 655                            HWMON_F_INPUT,
 656                            HWMON_F_INPUT,
 657                            HWMON_F_INPUT,
 658                            HWMON_F_INPUT),
 659         NULL
 660 };
 661
 662 static const struct hwmon_ops npcm7xx_hwmon_ops = {
 663         .is_visible = npcm7xx_is_visible,
 664         .read = npcm7xx_read,
 665         .write = npcm7xx_write,
 666 };
 667
 668 static const struct hwmon_chip_info npcm7xx_chip_info = {
 669         .ops = &npcm7xx_hwmon_ops,
 670         .info = npcm7xx_info,
 671 };
 672
 673 static u32 npcm7xx_pwm_init(struct npcm7xx_pwm_fan_data *data)
 674 {
 675         int m, ch;
 676         u32 prescale_val, output_freq;
 677
 678         data->pwm_clk_freq = clk_get_rate(data->pwm_clk);
 679
 680         /* Adjust NPCM7xx PWMs output frequency to ~25Khz */
 681         output_freq = data->pwm_clk_freq / PWN_CNT_DEFAULT;
 682         prescale_val = DIV_ROUND_CLOSEST(output_freq, PWM_OUTPUT_FREQ_25KHZ);
 683
 684         /* If prescale_val = 0, then the prescale output clock is stopped */
 685         if (prescale_val < MIN_PRESCALE1)
 686                 prescale_val = MIN_PRESCALE1;
 687         /*
 688          * prescale_val need to decrement in one because in the PWM Prescale
 689          * register the Prescale value increment by one
 690          */
 691         prescale_val--;
 692
 693         /* Setting PWM Prescale Register value register to both modules */
 694         prescale_val |= (prescale_val << NPCM7XX_PWM_PRESCALE_SHIFT_CH01);
 695
 696         for (m = 0; m < NPCM7XX_PWM_MAX_MODULES  ; m++) {
 697                 iowrite32(prescale_val, NPCM7XX_PWM_REG_PR(data->pwm_base, m));
 698                 iowrite32(NPCM7XX_PWM_PRESCALE2_DEFAULT,
 699                           NPCM7XX_PWM_REG_CSR(data->pwm_base, m));
 700                 iowrite32(NPCM7XX_PWM_CTRL_MODE_DEFAULT,
 701                           NPCM7XX_PWM_REG_CR(data->pwm_base, m));
 702
 703                 for (ch = 0; ch < NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE; ch++) {
 704                         iowrite32(NPCM7XX_PWM_COUNTER_DEFAULT_NUM,
 705                                   NPCM7XX_PWM_REG_CNRx(data->pwm_base, m, ch));
 706                 }
 707         }
 708
 709         return output_freq / ((prescale_val & 0xf) + 1);
 710 }
 711
 712 static void npcm7xx_fan_init(struct npcm7xx_pwm_fan_data *data)
 713 {
 714         int md;
 715         int ch;
 716         int i;
 717         u32 apb_clk_freq;
 718
 719         for (md = 0; md < NPCM7XX_FAN_MAX_MODULE; md++) {
 720                 /* stop FAN0~7 clock */
 721                 iowrite8(NPCM7XX_FAN_TCKC_CLKX_NONE,
 722                          NPCM7XX_FAN_REG_TCKC(data->fan_base, md));
 723
 724                 /* disable all interrupt */
 725                 iowrite8(0x00, NPCM7XX_FAN_REG_TIEN(data->fan_base, md));
 726
 727                 /* clear all interrupt */
 728                 iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
 729                          NPCM7XX_FAN_REG_TICLR(data->fan_base, md));
 730
 731                 /* set FAN0~7 clock prescaler */
 732                 iowrite8(NPCM7XX_FAN_CLK_PRESCALE,
 733                          NPCM7XX_FAN_REG_TPRSC(data->fan_base, md));
 734
 735                 /* set FAN0~7 mode (high-to-low transition) */
 736                 iowrite8((NPCM7XX_FAN_TMCTRL_MODE_5 | NPCM7XX_FAN_TMCTRL_TBEN |
 737                           NPCM7XX_FAN_TMCTRL_TAEN),
 738                          NPCM7XX_FAN_REG_TMCTRL(data->fan_base, md));
 739
 740                 /* set FAN0~7 Initial Count/Cap */
 741                 iowrite16(NPCM7XX_FAN_TCNT,
 742                           NPCM7XX_FAN_REG_TCNT1(data->fan_base, md));
 743                 iowrite16(NPCM7XX_FAN_TCNT,
 744                           NPCM7XX_FAN_REG_TCNT2(data->fan_base, md));
 745
 746                 /* set FAN0~7 compare (equal to count) */
 747                 iowrite8((NPCM7XX_FAN_TCPCFG_EQAEN | NPCM7XX_FAN_TCPCFG_EQBEN),
 748                          NPCM7XX_FAN_REG_TCPCFG(data->fan_base, md));
 749
 750                 /* set FAN0~7 compare value */
 751                 iowrite16(NPCM7XX_FAN_TCPA,
 752                           NPCM7XX_FAN_REG_TCPA(data->fan_base, md));
 753                 iowrite16(NPCM7XX_FAN_TCPB,
 754                           NPCM7XX_FAN_REG_TCPB(data->fan_base, md));
 755
 756                 /* set FAN0~7 fan input FANIN 0~15 */
 757                 iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
 758                          NPCM7XX_FAN_REG_TINASEL(data->fan_base, md));
 759                 iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
 760                          NPCM7XX_FAN_REG_TINBSEL(data->fan_base, md));
 761
 762                 for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE; i++) {
 763                         ch = md * NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE + i;
 764                         data->fan_dev[ch].fan_st_flg = FAN_DISABLE;
 765                         data->fan_dev[ch].fan_pls_per_rev =
 766                                 NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION;
 767                         data->fan_dev[ch].fan_cnt = 0;
 768                 }
 769         }
 770
 771         apb_clk_freq = clk_get_rate(data->fan_clk);
 772
 773         /* Fan tach input clock = APB clock / prescalar, default is 255. */
 774         data->input_clk_freq = apb_clk_freq / (NPCM7XX_FAN_CLK_PRESCALE + 1);
 775 }
 776
 777 static int
 778 npcm7xx_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
 779                              unsigned long *state)
 780 {
 781         struct npcm7xx_cooling_device *cdev = tcdev->devdata;
 782
 783         *state = cdev->max_state;
 784
 785         return 0;
 786 }
 787
 788 static int
 789 npcm7xx_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
 790                              unsigned long *state)
 791 {
 792         struct npcm7xx_cooling_device *cdev = tcdev->devdata;
 793
 794         *state = cdev->cur_state;
 795
 796         return 0;
 797 }
 798
 799 static int
 800 npcm7xx_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
 801                              unsigned long state)
 802 {
 803         struct npcm7xx_cooling_device *cdev = tcdev->devdata;
 804         int ret;
 805
 806         if (state > cdev->max_state)
 807                 return -EINVAL;
 808
 809         cdev->cur_state = state;
 810         ret = npcm7xx_pwm_config_set(cdev->data, cdev->pwm_port,
 811                                      cdev->cooling_levels[cdev->cur_state]);
 812
 813         return ret;
 814 }
 815
 816 static const struct thermal_cooling_device_ops npcm7xx_pwm_cool_ops = {
 817         .get_max_state = npcm7xx_pwm_cz_get_max_state,
 818         .get_cur_state = npcm7xx_pwm_cz_get_cur_state,
 819         .set_cur_state = npcm7xx_pwm_cz_set_cur_state,
 820 };
 821
 822 static int npcm7xx_create_pwm_cooling(struct device *dev,
 823                                       struct device_node *child,
 824                                       struct npcm7xx_pwm_fan_data *data,
 825                                       u32 pwm_port, u8 num_levels)
 826 {
 827         int ret;
 828         struct npcm7xx_cooling_device *cdev;
 829
 830         cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
 831         if (!cdev)
 832                 return -ENOMEM;
 833
 834         cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
 835         if (!cdev->cooling_levels)
 836                 return -ENOMEM;
 837
 838         cdev->max_state = num_levels - 1;
 839         ret = of_property_read_u8_array(child, "cooling-levels",
 840                                         cdev->cooling_levels,
 841                                         num_levels);
 842         if (ret) {
 843                 dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
 844                 return ret;
 845         }
 846         snprintf(cdev->name, THERMAL_NAME_LENGTH, "%pOFn%d", child,
 847                  pwm_port);
 848
 849         cdev->tcdev = devm_thermal_of_cooling_device_register(dev, child,
 850                                 cdev->name, cdev, &npcm7xx_pwm_cool_ops);
 851         if (IS_ERR(cdev->tcdev))
 852                 return PTR_ERR(cdev->tcdev);
 853
 854         cdev->data = data;
 855         cdev->pwm_port = pwm_port;
 856
 857         data->cdev[pwm_port] = cdev;
 858
 859         return 0;
 860 }
 861
 862 static int npcm7xx_en_pwm_fan(struct device *dev,
 863                               struct device_node *child,
 864                               struct npcm7xx_pwm_fan_data *data)
 865 {
 866         u8 *fan_ch;
 867         u32 pwm_port;
 868         int ret, fan_cnt;
 869         u8 index, ch;
 870
 871         ret = of_property_read_u32(child, "reg", &pwm_port);
 872         if (ret)
 873                 return ret;
 874
 875         data->pwm_present[pwm_port] = true;
 876         ret = npcm7xx_pwm_config_set(data, pwm_port,
 877                                      NPCM7XX_PWM_CMR_DEFAULT_NUM);
 878
 879         ret = of_property_count_u8_elems(child, "cooling-levels");
 880         if (ret > 0) {
 881                 ret = npcm7xx_create_pwm_cooling(dev, child, data, pwm_port,
 882                                                  ret);
 883                 if (ret)
 884                         return ret;
 885         }
 886
 887         fan_cnt = of_property_count_u8_elems(child, "fan-tach-ch");
 888         if (fan_cnt < 1)
 889                 return -EINVAL;
 890
 891         fan_ch = devm_kcalloc(dev, fan_cnt, sizeof(*fan_ch), GFP_KERNEL);
 892         if (!fan_ch)
 893                 return -ENOMEM;
 894
 895         ret = of_property_read_u8_array(child, "fan-tach-ch", fan_ch, fan_cnt);
 896         if (ret)
 897                 return ret;
 898
 899         for (ch = 0; ch < fan_cnt; ch++) {
 900                 index = fan_ch[ch];
 901                 data->fan_present[index] = true;
 902                 data->fan_dev[index].fan_st_flg = FAN_INIT;
 903         }
 904
 905         return 0;
 906 }
 907
 908 static int npcm7xx_pwm_fan_probe(struct platform_device *pdev)
 909 {
 910         struct device *dev = &pdev->dev;
 911         struct device_node *np, *child;
 912         struct npcm7xx_pwm_fan_data *data;
 913         struct resource *res;
 914         struct device *hwmon;
 915         char name[20];
 916         int ret, cnt;
 917         u32 output_freq;
 918         u32 i;
 919
 920         np = dev->of_node;
 921
 922         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 923         if (!data)
 924                 return -ENOMEM;
 925
 926         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
 927         if (!res) {
 928                 dev_err(dev, "pwm resource not found\n");
 929                 return -ENODEV;
 930         }
 931
 932         data->pwm_base = devm_ioremap_resource(dev, res);
 933         dev_dbg(dev, "pwm base resource is %pR\n", res);
 934         if (IS_ERR(data->pwm_base))
 935                 return PTR_ERR(data->pwm_base);
 936
 937         data->pwm_clk = devm_clk_get(dev, "pwm");
 938         if (IS_ERR(data->pwm_clk)) {
 939                 dev_err(dev, "couldn't get pwm clock\n");
 940                 return PTR_ERR(data->pwm_clk);
 941         }
 942
 943         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fan");
 944         if (!res) {
 945                 dev_err(dev, "fan resource not found\n");
 946                 return -ENODEV;
 947         }
 948
 949         data->fan_base = devm_ioremap_resource(dev, res);
 950         dev_dbg(dev, "fan base resource is %pR\n", res);
 951         if (IS_ERR(data->fan_base))
 952                 return PTR_ERR(data->fan_base);
 953
 954         data->fan_clk = devm_clk_get(dev, "fan");
 955         if (IS_ERR(data->fan_clk)) {
 956                 dev_err(dev, "couldn't get fan clock\n");
 957                 return PTR_ERR(data->fan_clk);
 958         }
 959
 960         output_freq = npcm7xx_pwm_init(data);
 961         npcm7xx_fan_init(data);
 962
 963         for (cnt = 0; cnt < NPCM7XX_PWM_MAX_MODULES  ; cnt++)
 964                 mutex_init(&data->pwm_lock[cnt]);
 965
 966         for (i = 0; i < NPCM7XX_FAN_MAX_MODULE; i++) {
 967                 spin_lock_init(&data->fan_lock[i]);
 968
 969                 data->fan_irq[i] = platform_get_irq(pdev, i);
 970                 if (data->fan_irq[i] < 0)
 971                         return data->fan_irq[i];
 972
 973                 sprintf(name, "NPCM7XX-FAN-MD%d", i);
 974                 ret = devm_request_irq(dev, data->fan_irq[i], npcm7xx_fan_isr,
 975                                        0, name, (void *)data);
 976                 if (ret) {
 977                         dev_err(dev, "register IRQ fan%d failed\n", i);
 978                         return ret;
 979                 }
 980         }
 981
 982         for_each_child_of_node(np, child) {
 983                 ret = npcm7xx_en_pwm_fan(dev, child, data);
 984                 if (ret) {
 985                         dev_err(dev, "enable pwm and fan failed\n");
 986                         of_node_put(child);
 987                         return ret;
 988                 }
 989         }
 990
 991         hwmon = devm_hwmon_device_register_with_info(dev, "npcm7xx_pwm_fan",
 992                                                      data, &npcm7xx_chip_info,
 993                                                      NULL);
 994         if (IS_ERR(hwmon)) {
 995                 dev_err(dev, "unable to register hwmon device\n");
 996                 return PTR_ERR(hwmon);
 997         }
 998
 999         for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM; i++) {
1000                 if (data->fan_present[i]) {
1001                         /* fan timer initialization */
1002                         data->fan_timer.expires = jiffies +
1003                                 msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
1004                         timer_setup(&data->fan_timer,
1005                                     npcm7xx_fan_polling, 0);
1006                         add_timer(&data->fan_timer);
1007                         break;
1008                 }
1009         }
1010
1011         pr_info("NPCM7XX PWM-FAN Driver probed, output Freq %dHz[PWM], input Freq %dHz[FAN]\n",
1012                 output_freq, data->input_clk_freq);
1013
1014         return 0;
1015 }
1016
1017 static const struct of_device_id of_pwm_fan_match_table[] = {
1018         { .compatible = "nuvoton,npcm750-pwm-fan", },
1019         {},
1020 };
1021 MODULE_DEVICE_TABLE(of, of_pwm_fan_match_table);
1022
1023 static struct platform_driver npcm7xx_pwm_fan_driver = {
1024         .probe          = npcm7xx_pwm_fan_probe,
1025         .driver         = {
1026                 .name   = "npcm7xx_pwm_fan",
1027                 .of_match_table = of_pwm_fan_match_table,
1028         },
1029 };
1030
1031 module_platform_driver(npcm7xx_pwm_fan_driver);
1032
1033 MODULE_DESCRIPTION("Nuvoton NPCM7XX PWM and Fan Tacho driver");
1034 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
1035 MODULE_LICENSE("GPL v2");