drivers/net/wireless/libra/qcomwlan7x27a_pwrif.c

/* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/device.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
#include <mach/rpc_pmapp.h>
#include <linux/err.h>
#include <linux/qcomwlan7x27a_pwrif.h>
#include <linux/module.h>

#define WLAN_GPIO_EXT_POR_N     134

static const char *id = "WLAN";

enum {
	WLAN_VREG_L17 = 0,
	WLAN_VREG_S3,
	WLAN_VREG_TCXO_L11,
	WLAN_VREG_L19,
	WLAN_VREG_L5,
	WLAN_VREG_L6
};

struct wlan_vreg_info {
	const char *vreg_id;
	unsigned int level_min;
	unsigned int level_max;
	unsigned int pmapp_id;
	unsigned int is_vreg_pin_controlled;
	struct regulator *reg;
};


static struct wlan_vreg_info vreg_info[] = {
	{"bt",        3050000, 3050000, 21, 1, NULL},
	{"msme1",     1800000, 1800000, 2,  0, NULL},
	{"wlan_tcx0", 1800000, 1800000, 53, 0, NULL},
	{"wlan4",     1200000, 1200000, 23, 0, NULL},
	{"wlan2",     1350000, 1350000, 9,  1, NULL},
	{"wlan3",     1200000, 1200000, 10, 1, NULL},
};

static int qrf6285_init_regs(void)
{
	struct regulator_bulk_data regs[ARRAY_SIZE(vreg_info)];
	int i, rc;

	for (i = 0; i < ARRAY_SIZE(regs); i++) {
		regs[i].supply = vreg_info[i].vreg_id;
		regs[i].min_uV = vreg_info[i].level_min;
		regs[i].max_uV = vreg_info[i].level_max;
	}

	rc = regulator_bulk_get(NULL, ARRAY_SIZE(regs), regs);
	if (rc) {
		pr_err("%s: could not get regulators: %d\n", __func__, rc);
		goto out;
	}

	for (i = 0; i < ARRAY_SIZE(regs); i++)
		vreg_info[i].reg = regs[i].consumer;

	return 0;

out:
	return rc;
}

int chip_power_qrf6285(bool on)
{
	static bool init_done;
	int rc = 0, index = 0;

	if (unlikely(!init_done)) {
		rc = qrf6285_init_regs();
		if (rc)
			return rc;
		else
			init_done = true;
	}

	if (on) {
		rc = gpio_request(WLAN_GPIO_EXT_POR_N, "WLAN_DEEP_SLEEP_N");

		if (rc) {
			pr_err("WLAN reset GPIO %d request failed %d\n",
			WLAN_GPIO_EXT_POR_N, rc);
			goto fail;
		}
		rc = gpio_direction_output(WLAN_GPIO_EXT_POR_N, 1);
		if (rc < 0) {
			pr_err("WLAN reset GPIO %d set direction failed %d\n",
			WLAN_GPIO_EXT_POR_N, rc);
			goto fail_gpio_dir_out;
		}
		rc = pmapp_clock_vote(id, PMAPP_CLOCK_ID_A0,
					PMAPP_CLOCK_VOTE_ON);
		if (rc) {
			pr_err("%s: Configuring A0 to always"
			" on failed %d\n", __func__, rc);
			goto clock_vote_fail;
		}
	} else {
		gpio_set_value_cansleep(WLAN_GPIO_EXT_POR_N, 0);
		rc = gpio_direction_input(WLAN_GPIO_EXT_POR_N);
		if (rc) {
			pr_err("WLAN reset GPIO %d set direction failed %d\n",
			WLAN_GPIO_EXT_POR_N, rc);
		}
		gpio_free(WLAN_GPIO_EXT_POR_N);
		rc = pmapp_clock_vote(id, PMAPP_CLOCK_ID_A0,
					PMAPP_CLOCK_VOTE_OFF);
		if (rc) {
			pr_err("%s: Configuring A0 to turn OFF"
			" failed %d\n", __func__, rc);
		}
	}

	for (index = 0; index < ARRAY_SIZE(vreg_info); index++) {
		if (on) {

			rc = regulator_set_voltage(vreg_info[index].reg,
						vreg_info[index].level_min,
						vreg_info[index].level_max);
			if (rc) {
				pr_err("%s:%s set voltage failed %d\n",
					__func__, vreg_info[index].vreg_id, rc);

				goto vreg_fail;
			}

			rc = regulator_enable(vreg_info[index].reg);
			if (rc) {
				pr_err("%s:%s vreg enable failed %d\n",
					__func__, vreg_info[index].vreg_id, rc);

				goto vreg_fail;
			}

			if (vreg_info[index].is_vreg_pin_controlled) {
				rc = pmapp_vreg_lpm_pincntrl_vote(id,
					 vreg_info[index].pmapp_id,
					 PMAPP_CLOCK_ID_A0, 1);
				if (rc) {
					pr_err("%s:%s pmapp_vreg_lpm_pincntrl"
						" for enable failed %d\n",
						__func__,
						vreg_info[index].vreg_id, rc);
					goto vreg_clock_vote_fail;
				}
			}

			/*At this point CLK_PWR_REQ is high*/
			if (WLAN_VREG_L6 == index) {
				/*
				 * Configure A0 clock to be slave to
				 * WLAN_CLK_PWR_REQ
`				 */
				rc = pmapp_clock_vote(id, PMAPP_CLOCK_ID_A0,
						PMAPP_CLOCK_VOTE_PIN_CTRL);
				if (rc) {
					pr_err("%s: Configuring A0 to Pin"
					" controllable failed %d\n",
							 __func__, rc);
					goto vreg_clock_vote_fail;
				}
			}

		} else {

			if (vreg_info[index].is_vreg_pin_controlled) {
				rc = pmapp_vreg_lpm_pincntrl_vote(id,
						 vreg_info[index].pmapp_id,
						 PMAPP_CLOCK_ID_A0, 0);
				if (rc) {
					pr_err("%s:%s pmapp_vreg_lpm_pincntrl"
						" for disable failed %d\n",
						__func__,
						vreg_info[index].vreg_id, rc);
				}
			}
			rc = regulator_disable(vreg_info[index].reg);
			if (rc) {
				pr_err("%s:%s vreg disable failed %d\n",
					__func__, vreg_info[index].vreg_id, rc);
			}
		}
	}
	return 0;
vreg_fail:
	index--;
vreg_clock_vote_fail:
	while (index >= 0) {
		rc = regulator_disable(vreg_info[index].reg);
		if (rc) {
			pr_err("%s:%s vreg disable failed %d\n",
				__func__, vreg_info[index].vreg_id, rc);
		}
		index--;
	}
	if (!on)
		goto fail;
clock_vote_fail:
	gpio_set_value_cansleep(WLAN_GPIO_EXT_POR_N, 0);
	rc = gpio_direction_input(WLAN_GPIO_EXT_POR_N);
	if (rc) {
		pr_err("WLAN reset GPIO %d set direction failed %d\n",
			WLAN_GPIO_EXT_POR_N, rc);
	}
fail_gpio_dir_out:
	gpio_free(WLAN_GPIO_EXT_POR_N);
fail:
	return rc;
}
EXPORT_SYMBOL(chip_power_qrf6285);