^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * thermometer driver (as used in the Rebel.com NetWinder)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <mach/hardware.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/mach-types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/therm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* define for /proc interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define THERM_USE_PROC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* Definitions for DS1620 chip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define THERM_START_CONVERT 0xee
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define THERM_RESET 0xaf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define THERM_READ_CONFIG 0xac
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define THERM_READ_TEMP 0xaa
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define THERM_READ_TL 0xa2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define THERM_READ_TH 0xa1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define THERM_WRITE_CONFIG 0x0c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define THERM_WRITE_TL 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define THERM_WRITE_TH 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define CFG_CPU 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define CFG_1SHOT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static DEFINE_MUTEX(ds1620_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static const char *fan_state[] = { "off", "on", "on (hardwired)" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Start of NetWinder specifics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Note! We have to hold the gpio lock with IRQs disabled over the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * whole of our transaction to the Dallas chip, since there is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * chance that the WaveArtist driver could touch these bits to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * enable or disable the speaker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) extern unsigned int system_rev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static inline void netwinder_ds1620_set_clk(int clk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) nw_gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static inline void netwinder_ds1620_set_data(int dat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) nw_gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static inline int netwinder_ds1620_get_data(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return nw_gpio_read() & GPIO_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static inline void netwinder_ds1620_set_data_dir(int dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) nw_gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static inline void netwinder_ds1620_reset(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) nw_cpld_modify(CPLD_DS_ENABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) nw_cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static inline void netwinder_lock(unsigned long *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) raw_spin_lock_irqsave(&nw_gpio_lock, *flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static inline void netwinder_unlock(unsigned long *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static inline void netwinder_set_fan(int i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) raw_spin_lock_irqsave(&nw_gpio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static inline int netwinder_get_fan(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if ((system_rev & 0xf000) == 0x4000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return FAN_ALWAYS_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return (nw_gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * End of NetWinder specifics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static void ds1620_send_bits(int nr, int value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) for (i = 0; i < nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) netwinder_ds1620_set_data(value & 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) netwinder_ds1620_set_clk(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) netwinder_ds1620_set_clk(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) value >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static unsigned int ds1620_recv_bits(int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) unsigned int value = 0, mask = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) netwinder_ds1620_set_data(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) for (i = 0; i < nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) netwinder_ds1620_set_clk(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (netwinder_ds1620_get_data())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) value |= mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) mask <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) netwinder_ds1620_set_clk(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static void ds1620_out(int cmd, int bits, int value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) netwinder_lock(&flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) netwinder_ds1620_set_clk(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) netwinder_ds1620_set_data_dir(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) netwinder_ds1620_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ds1620_send_bits(8, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) ds1620_send_bits(bits, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) netwinder_ds1620_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) netwinder_unlock(&flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) msleep(20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static unsigned int ds1620_in(int cmd, int bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) unsigned int value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) netwinder_lock(&flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) netwinder_ds1620_set_clk(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) netwinder_ds1620_set_data_dir(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) netwinder_ds1620_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) ds1620_send_bits(8, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) netwinder_ds1620_set_data_dir(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) value = ds1620_recv_bits(bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) netwinder_ds1620_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) netwinder_unlock(&flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int cvt_9_to_int(unsigned int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (val & 0x100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) val |= 0xfffffe00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static void ds1620_write_state(struct therm *therm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) ds1620_out(THERM_WRITE_TL, 9, therm->lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ds1620_out(THERM_WRITE_TH, 9, therm->hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ds1620_out(THERM_START_CONVERT, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static void ds1620_read_state(struct therm *therm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static int ds1620_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) ds1620_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) signed int cur_temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) signed char cur_temp_degF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* convert to Fahrenheit, as per wdt.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) cur_temp_degF = (cur_temp * 9) / 5 + 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (copy_to_user(buf, &cur_temp_degF, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) struct therm therm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct therm __user *therm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) int __user *i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) } uarg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) uarg.i = (int __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) switch(cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) case CMD_SET_THERMOSTATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) case CMD_SET_THERMOSTATE2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (cmd == CMD_SET_THERMOSTATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (get_user(therm.hi, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) therm.lo = therm.hi - 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) therm.lo <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) therm.hi <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ds1620_write_state(&therm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) case CMD_GET_THERMOSTATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) case CMD_GET_THERMOSTATE2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) ds1620_read_state(&therm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) therm.lo >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) therm.hi >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (cmd == CMD_GET_THERMOSTATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (put_user(therm.hi, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) case CMD_GET_TEMPERATURE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) case CMD_GET_TEMPERATURE2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (cmd == CMD_GET_TEMPERATURE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) i >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return put_user(i, uarg.i) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) case CMD_GET_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return put_user(i, uarg.i) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) case CMD_GET_FAN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) i = netwinder_get_fan();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return put_user(i, uarg.i) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) case CMD_SET_FAN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (get_user(i, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) netwinder_set_fan(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) mutex_lock(&ds1620_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) ret = ds1620_ioctl(file, cmd, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) mutex_unlock(&ds1620_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) #ifdef THERM_USE_PROC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static int ds1620_proc_therm_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct therm th;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) ds1620_read_state(&th);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) seq_printf(m, "Thermostat: HI %i.%i, LOW %i.%i; temperature: %i.%i C, fan %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) th.hi >> 1, th.hi & 1 ? 5 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) th.lo >> 1, th.lo & 1 ? 5 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) temp >> 1, temp & 1 ? 5 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) fan_state[netwinder_get_fan()]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static const struct file_operations ds1620_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) .open = ds1620_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) .read = ds1620_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) .unlocked_ioctl = ds1620_unlocked_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static struct miscdevice ds1620_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) TEMP_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) "temp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) &ds1620_fops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) static int __init ds1620_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct therm th, th_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (!machine_is_netwinder())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) ds1620_out(THERM_RESET, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) ds1620_out(THERM_START_CONVERT, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * Trigger the fan to start by setting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * temperature high point low. This kicks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * the fan into action.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) ds1620_read_state(&th);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) th_start.lo = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) th_start.hi = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) ds1620_write_state(&th_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) msleep(2000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) ds1620_write_state(&th);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) ret = misc_register(&ds1620_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) #ifdef THERM_USE_PROC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (!proc_create_single("therm", 0, NULL, ds1620_proc_therm_show))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) printk(KERN_ERR "therm: unable to register /proc/therm\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) ds1620_read_state(&th);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) "current %i.%i C, fan %s.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) th.hi >> 1, th.hi & 1 ? 5 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) th.lo >> 1, th.lo & 1 ? 5 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) ret >> 1, ret & 1 ? 5 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) fan_state[netwinder_get_fan()]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static void __exit ds1620_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) #ifdef THERM_USE_PROC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) remove_proc_entry("therm", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) misc_deregister(&ds1620_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) module_init(ds1620_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) module_exit(ds1620_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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